Updated on 2026/03/07

写真a

 
IWASE AKIHIDE
 
Organization
Undergraduate School School of Science and Technology Professor
Title
Professor
External link

Degree

  • 博士(理学) ( 東京理科大学 )

Research Interests

  • Photocatalysis

  • Artificial Photosynthesis

  • Photoelectrochemistry

Research Areas

  • Manufacturing technology (mechanical,electrical/electronic, chemical engineering) / Catalytic processes and resource chemistry

  • Nanotechnology/Materials / Energy chemistry

Education

  • Tokyo University of Science   Graduate School of Science

    2006.4 - 2009.3

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  • Tokyo University of Science   Graduate School of Science

    2004.4 - 2006.3

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  • Tokyo University of Science   Faculty of Science   Department of Applied Chemistry

    2000.4 - 2004.3

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Research History

  • Meiji University   Professor

    2024.4

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  • Meiji University   Associate Professor

    2019.4 - 2024.3

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  • Tokyo University of Science   Assistant Professor

    2016.4 - 2019.3

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  • Tokyo University of Science   Assistant Professor

    2012.4 - 2016.3

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  • University of New South Wales   Postdoctoral Research Associate

    2009.4 - 2012.4

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  • Research Fellowships of the Japan Society for the Promotion of Science for Young Scientists

    2006.4 - 2009.3

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Professional Memberships

Papers

  • Development of Z‐Scheme Photocatalyst Systems Combining Nonmetal Oxide Materials for Water Splitting under Visible Light Irradiation: (CuGa)0.5ZnS2 as a H2‐Evolving Photocatalyst and TaON as an O2‐Evolving Photocatalyst Reviewed International coauthorship

    Misa Moriya, Shunya Yoshino, Makoto Kobayashi, Hideki Kato, Yun Hau Ng, Akihide Iwase

    Advanced Energy and Sustainability Research   2025.1

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    DOI: 10.1002/aesr.202400371

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  • Photocatalytic water splitting over K3Li2Ta5O15 with a C-site-filled tungsten bronze structure and influence of metal cations at C-site on photocatalytic properties Reviewed

    Misa Moriya, Hideki Kato, Akihide Iwase

    Bulletin of the Chemical Society of Japan   2024.9

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    DOI: 10.1093/bulcsj/uoae102

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  • Photocatalytic water splitting over K6M10.8O30 (M = Ta, Nb) with a partially filled tetragonal tungsten bronze structure Reviewed

    Misa Moriya, Hideki Kato, Akihide Iwase

    Chemistry Letters   2024.6

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    DOI: 10.1093/chemle/upae110

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  • Modification of Visible‐Light‐Responsive Pb<sub>2</sub>Ti<sub>2</sub>O<sub>5.4</sub>F<sub>1.2</sub> with Metal Oxide Cocatalysts to Improve Photocatalytic O<sub>2</sub> Evolution toward Z‐Scheme Overall Water Splitting

    Yoshitaka Tamura, Megumi Okazaki, Hiroto Ueki, Kenta Aihara, Tomoki Kanazawa, Dongxiao Fan, Rie Haruki, Akihide Iwase, Shunsuke Nozawa, Fumitaka Ishiwari, Kunihisa Sugimoto, Akinori Saeki, Kazuhiko Maeda

    ChemSusChem   2024.5

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    Publishing type:Research paper (scientific journal)   Publisher:Wiley  

    Abstract

    The development of a highly active photocatalyst for visible‐light water splitting requires a high‐quality semiconductor material and a cocatalyst, which promote both the migration of photogenerated charge carriers and surface redox reactions. In this work, a cocatalyst was loaded onto an oxyfluoride photocatalyst, Pb<sub>2</sub>Ti<sub>2</sub>O<sub>5.4</sub>F<sub>1.2</sub>, to improve the water oxidation activity. Among the metal oxides examined as cocatalysts, RuO<sub>2</sub> was found to be the most suitable, and the O<sub>2</sub> evolution activity depended on the preparation conditions for Ru/Pb<sub>2</sub>Ti<sub>2</sub>O<sub>5.4</sub>F<sub>1.2</sub>. The highest activity was obtained with RuCl<sub>3</sub>‐impregnated Pb<sub>2</sub>Ti<sub>2</sub>O<sub>5.4</sub>F<sub>1.2</sub> heated under a flow of H<sub>2</sub> at 523 K. The H<sub>2</sub>‐treated Ru/Pb<sub>2</sub>Ti<sub>2</sub>O<sub>5.4</sub>F<sub>1.2</sub> showed an O<sub>2</sub> evolution rate an order of magnitude higher than those for the analogues without the H<sub>2</sub> treatment (e. g., RuO<sub>2</sub>/Pb<sub>2</sub>Ti<sub>2</sub>O<sub>5.4</sub>F<sub>1.2</sub>). Physicochemical analyses by X‐ray absorption fine‐structure spectroscopy, X‐ray photoelectron spectroscopy, scanning electron microscopy, and time‐resolved microwave conductivity measurements indicated that the optimized photocatalyst contained partially reduced RuO<sub>2</sub> species with a particle size of ~5 nm. These partially reduced species effectively trapped the photogenerated charge carriers and promoted the oxidation of water into O<sub>2</sub>. The optimized Ru/Pb<sub>2</sub>Ti<sub>2</sub>O<sub>5.4</sub>F<sub>1.2</sub> could function as an O<sub>2</sub>‐evolving photocatalyst in Z‐scheme overall water splitting, in combination with an Ru‐loaded, Rh‐doped SrTiO<sub>3</sub> photocatalyst.

    DOI: 10.1002/cssc.202400408

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  • Water splitting and CO<sub>2</sub> reduction over an AgSr<sub>2</sub>Ta<sub>5</sub>O<sub>15</sub> photocatalyst developed by a valence band control strategy

    Tomoaki Takayama, Akihide Iwase, Akihiko Kudo

    CHEMICAL COMMUNICATIONS   59 ( 51 )   7911 - 7914   2023.6

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    DOI: 10.1039/d3cc01481a

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  • Overall Water Splitting Under Visible Light Irradiation Over Ir and A-Codoped KTaO<sub>3</sub> (A=Ca, Sr, Ba, La) Photocatalysts

    Akihide Iwase, Haruka Misono

    ENERGY TECHNOLOGY   11 ( 1 )   2023.1

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    DOI: 10.1002/ente.202200739

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  • The development of an Ir and Sr-codoped KNbO<sub>3</sub> photocatalyst as an O<sub>2</sub>-evolving photocatalyst for Z-schematic water splitting under visible light irradiation

    Akihide Iwase, Rikako Sakamoto, Haruka Misono

    CHEMICAL COMMUNICATIONS   58 ( 93 )   12951 - 12954   2022.11

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1039/d2cc04977e

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  • Powder-Based Cu<sub>3</sub>VS<sub>4</sub> Photocathode Prepared by Particle-Transfer Method for Water Splitting Using the Whole Range of Visible Light

    Hirofumi Fukai, Kengo Nagatsuka, Yuichi Yamaguchi, Akihide Iwase, Akihiko Kudo

    ECS JOURNAL OF SOLID STATE SCIENCE AND TECHNOLOGY   11 ( 6 )   2022.6

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    DOI: 10.1149/2162-8777/ac71c8

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  • CO2 Reduction Using Water as an Electron Donor over Heterogeneous Photocatalysts Aiming at Artificial Photosynthesis. International journal

    Shunya Yoshino, Tomoaki Takayama, Yuichi Yamaguchi, Akihide Iwase, Akihiko Kudo

    Accounts of chemical research   55 ( 7 )   966 - 977   2022.4

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    ConspectusPhotocatalytic and photoelectrochemical CO2 reduction of artificial photosynthesis is a promising chemical process to solve resource, energy, and environmental problems. An advantage of artificial photosynthesis is that solar energy is converted to chemical products using abundant water as electron and proton sources. It can be operated under ambient temperature and pressure. Especially, photocatalytic CO2 reduction employing a powdered material would be a low-cost and scalable system for practical use because of simplicity of the total system and simple mass-production of a photocatalyst material.In this Account, single particulate photocatalysts, Z-scheme photocatalysts, and photoelectrodes are introduced for artificial photosynthetic CO2 reduction. It is indispensable to use water as an electron donor (i.e., reasonable O2 evolution) but not to use a sacrificial reagent of a strong electron donor, for achievement of the artificial photosynthetic CO2 reduction accompanied by ΔG > 0. Confirmations of O2 evolution, a ratio of reacted e- to h+ estimated from obtained products, a turnover number, and a carbon source of a CO2 reduction product are discussed as the key points for evaluation of photocatalytic and photoelectrochemical CO2 reduction.Various metal oxide photocatalysts with wide band gaps have been developed for water splitting under UV light irradiation. However, these bare metal oxide photocatalysts without a cocatalyst do not show high photocatalytic CO2 reduction activity in an aqueous solution. The issue comes from lack of a reaction site for CO2 reduction and competitive reaction between water and CO2 reduction. This raises a key issue to find a cocatalyst and optimize reaction conditions defining this research field. Loading a Ag cocatalyst as a CO2 reduction site and NaHCO3 addition for a smooth supply of hydrated CO2 molecules as reactant are beneficial for efficient photocatalytic CO2 reduction. Ag/BaLa4Ti4O15 and Ag/NaTaO3:Ba reduce CO2 to CO as a main reduction reaction using water as an electron donor even in just water and an aqueous NaHCO3 solution. A Rh-Ru cocatalyst on NaTaO3:Sr gives CH4 with 10% selectivity (Faradaic efficiency) based on the number of reacted electrons in the photocatalytic CO2 reduction accompanied by O2 evolution by water oxidation.Visible-light-responsive photocatalyst systems are indispensable for efficient sunlight utilization. Z-scheme systems using CuGaS2, (CuGa)1-xZn2xS2, CuGa1-xInxS2, and SrTiO3:Rh as CO2-reducing photocatalyst, BiVO4 as O2-evolving photocatalyst, and reduced graphene oxide (RGO) and Co-complex as electron mediator or without an electron mediator are active for CO2 reduction using water as an electron donor under visible light irradiation. These metal sulfide photocatalysts have the potential to take part in Z-scheme systems for artificial photosynthetic CO2 reduction, even though their ability to extract electrons from water is insufficient.A photoelectrochemical system using a photocathode is also attractive for CO2 reduction under visible light irradiation. For example, p-type CuGaS2, (CuGa)1-xZn2xS2, Cu1-xAgxGaS2, and SrTiO3:Rh function as photocathodes for CO2 reduction under visible light irradiation. Moreover, introducing a conducting polymer as a hole transporter and surface modification with Ag and ZnS improve photoelectrochemical performance.

    DOI: 10.1021/acs.accounts.1c00676

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  • Photocatalytic CO2 Reduction Using Water as an Electron Donor under Visible Light Irradiation by Z-Scheme and Photoelectrochemical Systems over (CuGa)0.5ZnS2 in the Presence of Basic Additives. International journal

    Shunya Yoshino, Akihide Iwase, Yuichi Yamaguchi, Tomiko M Suzuki, Takeshi Morikawa, Akihiko Kudo

    Journal of the American Chemical Society   144 ( 5 )   2323 - 2332   2022.2

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    We demonstrated photocatalytic CO2 reduction using water as an electron donor under visible light irradiation by a Z-scheme photocatalyst and a photoelectrochemical cell using bare (CuGa)0.5ZnS2 prepared by a flux method as a CO2-reducing photocatalyst. The Z-scheme system employing the bare (CuGa)0.5ZnS2 photocatalyst and RGO-(CoOx/BiVO4) as an O2-evolving photocatalyst produced CO of a CO2 reduction product accompanied by H2 and O2 in a simple suspension system without any additives under visible light irradiation and 1 atm of CO2. When a basic salt (i.e., NaHCO3, NaOH, etc.) was added into the reactant solution (H2O + CO2), the CO formation rate and the CO selectivity increased. The same effect of the basic salt was observed for sacrificial CO2 reduction using SO32- as an electron donor over the bare (CuGa)0.5ZnS2 photocatalyst. The selectivity for the CO formation of the Z-schematic CO2 reduction reached 10-20% in the presence of the basic salt even in an aqueous solution and without loading any cocatalysts on the (CuGa)0.5ZnS2 metal sulfide photocatalyst. It is notable that CO was obtained accompanied by reasonable O2 evolution, indicating that water was an electron donor for the CO2 reduction. Moreover, the present Z-scheme system also showed activity for solar CO2 reduction using water as an electron donor. The bare (CuGa)0.5ZnS2 powder loaded on an FTO glass was also used as a photocathode for CO2 reduction under visible light irradiation. CO and H2 were obtained on the photocathode with 20% and 80% Faradaic efficiencies at 0.1 V vs RHE, respectively.

    DOI: 10.1021/jacs.1c12636

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  • Development of visible-light-responsive Ir and La-codoped KTaO3 photocatalysts for water splitting. International journal

    Akihide Iwase, Haruka Misono

    Chemical communications (Cambridge, England)   57 ( 80 )   10331 - 10334   2021.10

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    Ir and La-codoped KTaO3 has arisen as a novel powdered photocatalyst responding to visible light up to a wavelength of 600 nm. RhCrO3-loaded KTaO3 codoped with Ir and La splits water into H2 and O2 under visible light irradiation.

    DOI: 10.1039/d1cc04227k

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  • New Visible-Light-Driven H<inf>2</inf>- And O<inf>2</inf>-Evolving Photocatalysts Developed by Ag(I) and Cu(I) Ion Exchange of Various Layered and Tunneling Metal Oxides Using Molten Salts Treatments

    Kenta Watanabe, Katsuya Iwashina, Akihide Iwase, Shunsuke Nozawa, Shin Ichi Adachi, Akihiko Kudo

    Chemistry of Materials   32 ( 24 )   10524 - 10537   2020.12

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    DOI: 10.1021/acs.chemmater.0c03461

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  • Z-Schematic CO2 Reduction to CO through Interparticle Electron Transfer between SrTiO3:Rh of a Reducing Photocatalyst and BiVO4 of a Water Oxidation Photocatalyst under Visible Light

    Shunya Yoshino, Ko Sato, Yuichi Yamaguchi, Akihide Iwase, Akihiko Kudo

    ACS APPLIED ENERGY MATERIALS   3 ( 10 )   10001 - 10007   2020.10

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    DOI: 10.1021/acsaem.0c01684

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  • Long wavelength visible light-responsive SrTiO<sub>3</sub> photocatalysts doped with valence-controlled Ru for sacrificial H<sub>2</sub> and O<sub>2</sub> evolution

    Sho Suzuki, Akihide Iwase, Akihiko Kudo

    CATALYSIS SCIENCE & TECHNOLOGY   10 ( 15 )   4912 - 4916   2020.8

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1039/d0cy00600a

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  • Z-Schematic Solar Water Splitting Using Fine Particles of H-2-Evolving (CuGa)(0.5)ZnS2 Photocatalyst Prepared by a Flux Method with Chloride Salts

    Shunya Yoshino, Akihide Iwase, Yun Hau Ng, Rose Amal, Akihiko Kudo

    ACS APPLIED ENERGY MATERIALS   3 ( 6 )   5684 - 5692   2020.6

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    DOI: 10.1021/acsaem.0c00661

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  • Solar water splitting over Rh0.5Cr1.5O3-loaded AgTaO3 of a valence-band-controlled metal oxide photocatalyst

    Kenta Watanabe, Akihide Iwase, Akihiko Kudo

    CHEMICAL SCIENCE   11 ( 9 )   2330 - 2334   2020.3

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    DOI: 10.1039/c9sc05909a

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  • Activation of Water-Splitting Photocatalysts by Loading with Ultrafine Rh-Cr Mixed-Oxide Cocatalyst Nanoparticles. Reviewed International journal

    Wataru Kurashige, Yutaro Mori, Shuhei Ozaki, Masanobu Kawachi, Sakiat Hossain, Tokuhisa Kawawaki, Cameron J Shearer, Akihide Iwase, Gregory F Metha, Seiji Yamazoe, Akihiko Kudo, Yuichi Negishi

    Angewandte Chemie (International ed. in English)   2020.2

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    The activity of many water-splitting photocatalysts could be improved by the use of Rh(III)-Cr(III) mixed oxide (Rh 2- x Cr x O 3 ) particles as cocatalysts. Although further improvement of water-splitting activity could be achieved if the size of the Rh 2- x Cr x O 3 particles was decreased further, it is difficult to load ultrafine (<2 nm) Rh 2- x Cr x O 3 particles onto a photocatalyst using conventional loading methods. In this study, we successfully established a new loading method and used it to load Rh 2- x Cr x O 3 particles with a size of approximately 1.3 nm and a narrow size distribution onto the BaLa 4 Ti 4 O 15 photocatalyst. The obtained photocatalyst exhibited an apparent quantum yield of 16%, which is the highest achieved for BaLa 4 Ti 4 O 15 to date. Thus, the developed loading technique of Rh 2- x Cr x O 3 particles is extremely effective at improving the activity of the water-splitting photocatalyst BaLa 4 Ti 4 O 15 . This method is expected to be extended to other advanced water-splitting photocatalysts to achieve higher quantum yields.

    DOI: 10.1002/anie.201916681

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  • Water Splitting on Aluminum Porphyrins To Form Hydrogen and Hydrogen Peroxide by One Photon of Visible Light Reviewed

    Fazalurahman Kuttassery, Shogo Sagawa, Siby Mathew, Yu Nabetani, Akihide Iwase, Akihiko Kudo, Hiroshi Tachibana, Haruo Inoue

    ACS Applied Energy Materials   2019.11

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    DOI: 10.1021/acsaem.9b01552

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  • Photocathode Characteristics of a Spray-Deposited Cu2ZnGeS4 Thin Film for CO2 Reduction in a CO2-Saturated Aqueous Solution Reviewed

    Shigeru Ikeda, Shotaro Fujikawa, Takashi Harada, Thi Hiep Nguyen, Shuji Nakanishi, Tomoaki Takayama, Akihide Iwase, Akihiko Kudo

    ACS Applied Energy Materials   2019.9

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    DOI: 10.1021/acsaem.9b01418

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  • Z-scheme water splitting by microspherical Rh-doped SrTiO3 photocatalysts prepared by a spray drying method Reviewed

    Hong Phong Duong, Mashiyama, Takahiro, Kobayashi, Makoto, Iwase, Akihide, Kudo, Akihiko, Asakura, Yusuke, Yin, Shu, Kakihana, Masato, Kato, Hideki

    APPLIED CATALYSIS B-ENVIRONMENTAL   252   222 - 229   2019.9

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    DOI: 10.1016/j.apcatb.2019.04.009

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  • The Importance of the Interfacial Contact: Is Reduced Graphene Oxide Always an Enhancer in Photo(Electro)Catalytic Water Oxidation? Reviewed International journal

    Zhirun Xie, Hui Ling Tan, Xiaoming Wen, Yoshitaka Suzuki, Akihide Iwase, Akihiko Kudo, Rose Amal, Jason Scott, Yun Hau Ng

    ACS Applied Materials & Interfaces   11 ( 26 )   23125 - 23134   2019.7

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    Optimizing interfacial contact between graphene and a semiconductor has often been proposed as essential for improving their charge interactions. Herein, we fabricated bismuth vanadate-reduced graphene oxide (BiVO4/rGO) composites with tailored interfacial contact extents and revealed their disparate behavior in photoelectrochemical (PEC) and powder suspension (PS) water oxidation systems. BiVO4/rGO with a high rGO coverage on the BiVO4 surface (BiVO4/rGO HC) exhibited an 8-fold enhancement in the PEC photocurrent density with respect to neat BiVO4 at 0 V versus Ag/AgCl, while BiVO4/rGO with a low rGO coverage (BiVO4/rGO LC) gave a lesser 3-fold enhancement. In contrast, BiVO4/rGO HC delivered a detrimental effect, while BiVO4/rGO LC exhibited an enhanced performance for oxygen evolution in the PS system. The phenomenon is attributed to changes in the hydrophobicity of the BiVO4/rGO composite in conjunction with the interfacial contact configuration. A better BiVO4/rGO interfacial contact was found to improve the charge separation efficiency and charge transfer ability of the composite material, explaining the superior PEC performance of BiVO4/rGO HC. Additionally, optimization of the interfacial contact extent was revealed to further improve the energetics of the composite material, as evidenced by a Fermi level shift to a more negative potential. However, the high hydrophobicity of BiVO4/rGO HC arising from the higher rGO reduction extent triggered poor water miscibility, reducing the surface wettability and therefore hampering the photocatalytic O2 evolution activity of the sample. The study underlines water miscibility as a governing issue in the PS system.

    DOI: 10.1021/acsami.9b03624

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  • Atomic-Level Understanding of the Effect of Heteroatom Doping of the Cocatalyst on Water-Splitting Activity in AuPd or AuPt Alloy Cluster-Loaded BaLa4Ti4O15 Reviewed

    Wataru Kurashige, Rui Hayashi, Kosuke Wakamatsu, Yuki Kataoka, Sakiat Hossain, Akihide Iwase, Akihiko Kudo, Seiji Yamazoe, Yuichi Negishi

    ACS Applied Energy Materials   2019.6

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    DOI: 10.1021/acsaem.9b00426

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  • Effects of Coapplication of Rh-Doping and Ag-Substitution on the Band Structure of Li2TiO3 and the Photocatalytic Property Reviewed

    Kenta Watanabe, Akihide Iwase, Shunsuke Nozawa, Shin-ichi Adachi, Akihiko Kudo

    ACS Sustainable Chemistry & Engineering   2019.6

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    Publishing type:Research paper (scientific journal)   Publisher:American Chemical Society ({ACS})  

    DOI: 10.1021/acssuschemeng.9b00513

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  • Solar Water Splitting under Neutral Conditions Using Z‐Scheme Systems with Mo‐Doped BiVO 4 as an O 2 ‐Evolving Photocatalyst Reviewed

    Akihide Iwase, Yuhei Udagawa, Shunya Yoshino, Yun Hau Ng, Rose Amal, Akihiko Kudo

    Energy Technology   2019.5

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    Publishing type:Research paper (scientific journal)   Publisher:Wiley  

    DOI: 10.1002/ente.201900358

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  • Cu 3 MS 4 (M=V, Nb, Ta) and its Solid Solutions with Sulvanite Structure for Photocatalytic and Photoelectrochemical H 2 Evolution under Visible‐Light Irradiation Reviewed International journal

    Satoru Ikeda, Naruhiko Aono, Akihide Iwase, Hisayoshi Kobayashi, Akihiko Kudo

    ChemSusChem   12 ( 9 )   1977 - 1983   2019.5

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    Solid solutions with of Cu3 VS4 with either Cu3 NbS4 or Cu3 TaS4 (Cu3 Nb1-x Vx S4 or Cu3 Ta1-x Vx S4 ) were prepared by a solid-state reaction and adopted a sulvanite structure. Their band gaps were 1.6-1.7 eV corresponding to the absorption of a wide range of visible light. Ru cocatalyst-loaded Cu3 MS4 (M=V, Nb, Ta), Cu3 Nb1-x Vx S4 , and Cu3 Ta1-x Vx S4 showed photocatalytic activities for sacrificial H2 evolution under visible-light irradiation. Most solid solutions showed better activities than the single-component Cu3 MS4 (M=V, Nb, Ta). Cu3 MS4 (M=V, Nb), Cu3 Nb1-x Vx S4 , and Cu3 Ta1-x Vx S4 also functioned as photoelectrodes and gave cathodic photocurrents under visible-light irradiation, indicating a p-type semiconductor character. Cu3 Nb0.9 V0.1 S4 showed the best photocatalytic and photoelectrochemical performances. When Ru-loaded Cu3 Nb0.9 V0.1 S4 was used as a photocathode with a CoOx -loaded BiVO4 photoanode, photoelectrochemical water splitting proceeded under simulated sunlight irradiation without an external bias.

    DOI: 10.1002/cssc.201802702

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  • Water reduction into hydrogen using Rh-doped SrTiO3 photoelectrodes surface-modified by minute amounts of Pt: Insights from heterogeneous kinetic analysis Reviewed

    M.Antuch, P. Millet, A. Iwase, A. Kudo

    ELECTROCHIMICA ACTA   297   696 - 704   2019.2

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  • Z-scheme photocatalyst systems employing Rh- and Ir-doped metal oxide materials for water splitting under visible light irradiation Reviewed International journal

    Akihiko Kudo, Shunya Yoshino, Taichi Tsuchiya, Yuhei Udagawa, Yukihiro Takahashi, Masaharu Yamaguchi, Ikue Ogasawara, Hiroe Matsumoto, Akihide Iwase

    Faraday Discussions   215 ( 0 )   313 - 328   2019

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Royal Society of Chemistry ({RSC})  

    Various types of Z-scheme systems for water splitting under visible light irradiation were successfully developed by employing Rh- and Ir-doped metal oxide powdered materials with relatively narrow energy gaps (EG): BaTa2O6:Ir,La (EG: 1.9-2.0 eV), NaTaO3:Ir,La (EG: 2.1-2.3 eV), SrTiO3:Ir (EG: 1.6-1.8 eV), NaNbO3:Rh,Ba (EG: 2.5 eV) and TiO2:Rh,Sb (EG: 2.1 eV), with conventional SrTiO3:Rh (an H2-evolving photocatalyst) or BiVO4 (an O2-evolving photocatalyst), and suitable electron mediators. The Z-scheme systems were classified into three groups depending on the combination of H2- and O2-evolving photocatalysts and electron mediator. The Z-scheme systems combining BaTa2O6:Ir,La with BiVO4, and NaTaO3:Ir,La with BiVO4 were active when a [Co(bpy)3]3+/2+ redox couple was used rather than an Fe3+/2+ one. The combination of SrTiO3:Ir with SrTiO3:Rh gave an activity when the [Co(bpy)3]3+/2+ and Fe3+/2+ redox couple ionic mediators were used. The Z-scheme systems combining NaNbO3:Rh,Ba and TiO2:Rh,Sb with SrTiO3:Rh showed activities by using the [Co(bpy)3]3+/2+ and Fe3+/2+ redox couples and also via interparticle electron transfer by just contact with/without reduced graphene oxide (RGO). These suitable combinations can be explained based on the impurity levels of doped Rh3+ and Ir3+ toward the redox potentials of the ionic mediators for the Z-scheme systems employing ionic mediators, and p-/n-type and onset potentials of the photocurrent in the photoelectrochemical properties of those photocatalyst materials for the Z-scheme systems working via interparticle electron transfer.

    DOI: 10.1039/C8FD00209F

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  • The role of surface states during photocurrent switching: Intensity modulated photocurrent spectroscopy analysis of BiVO4 photoelectrodes Reviewed

    Manuel Antuch, Pierre Millet, Akihide Iwase, Akihiko Kudo

    Applied Catalysis B: Environmental   237   401 - 408   2018.12

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    DOI: 10.1016/j.apcatb.2018.05.011

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  • Photoelectrochemical Reduction of CO2 to CO Using a CuGaS2 Thin-film Photocathode Prepared by a Spray Pyrolysis Method Reviewed

    Ikeda Shigeru, Tanaka Yuta, Kawaguchi Takato, Fujikawa Shotaro, Harada Takashi, Takayama Tomoaki, Iwase Akihide, Kudo Akihiko

    CHEMISTRY LETTERS   47 ( 11 )   1424 - 1427   2018.11

  • Photoexcited Electrons Driven by Doping Concentration Gradient: Flux-Prepared NaTaO3 Photocatalysts Doped with Strontium Cations Reviewed

    Longjie An, Mitsunori Kitta, Akihide Iwase, Akihiko Kudo, Nobuyuki Ichikuni, Hiroshi Onishi

    ACS Catalysis   8 ( 10 )   9334 - 9341   2018.10

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  • Water splitting over Ba2In2O5 photocatalysts with a brownmillerite structure and the effect of La-substitution on its band structure and photocatalytic activities Reviewed

    K. Nakagawa, A. Iwase, A. Kudo

    CHEMISTRY LETTERS   47   1526 - 1529   2018.10

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    DOI: 10.1246/cl.180758

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  • Au25-Loaded BaLa4Ti4O15 Water-Splitting Photocatalyst with Enhanced Activity and Durability Produced Using New Chromium Oxide Shell Formation Method Reviewed

    Wataru Kurashige, Rina Kumazawa, Daiki Ishii, Rui Hayashi, Yoshiki Niihori, Sakiat Hossain, Lakshmi V. Nair, Tomoaki Takayama, Akihide Iwase, Seiji Yamazoe, Tatsuya Tsukuda, Akihiko Kudo, Yuichi Negishi

    The Journal of Physical Chemistry C   122 ( 25 )   13669 - 13681   2018.6

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  • Photochemical hydrogen evolution on metal ion surface-grafted TiO2-particles prepared by sol/gel method without calcination Reviewed

    Fazalurahman Kuttassery, Daisuke Yamamoto, Siby Mathew, Sebastian Nybin Remello, Arun Thomas, Yu Nabetani, Akihide Iwase, Akihiko Kudo, Hiroshi Tachibana, Haruo Inoue

    Journal of Photochemistry and Photobiology A: Chemistry   358   386 - 394   2018.5

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    DOI: 10.1016/j.jphotochem.2017.09.048

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  • Photocatalytic CO2 reduction using water as an electron donor over Ag-loaded metal oxide photocatalysts consisting of several polyhedra of Ti4+, Zr4+, and Ta5+ Reviewed

    Tomoaki Takayama, Haruka Nakanishi, Motoki Matsui, Akihide Iwase, Akihiko Kudo

    Journal of Photochemistry and Photobiology A: Chemistry   358   416 - 421   2018.5

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    DOI: 10.1016/j.jphotochem.2017.10.002

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  • Enhancement of CO2 reduction activity under visible light irradiation over Zn-based metal sulfides by combination with Ru-complex catalysts Reviewed

    Tomiko M. Suzuki, Tomoaki Takayama, Shunsuke Sato, Akihide Iwase, Akihiko Kudo, Takeshi Morikawa

    Applied Catalysis B: Environmental   224   572 - 578   2018.5

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    DOI: 10.1016/j.apcatb.2017.10.053

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  • Preparation of Mo- and W-doped BiVO4 fine particles prepared by an aqueous route for photocatalytic and photoelectrochemical O-2 Reviewed

    Iwase, Akihide, Nozawa, Shunsuke, Adachi, Shin-ichi, Kudo, Akihiko

    Journal of Photochemistry and Photobiology a-Chemistry   353   284 - 291   2018

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    DOI: 10.1016/j.jphotochem.2017.11.025

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  • Powder-based (CuGa1−yIny)1−xZn2xS2 solid solution photocathodes with a largely positive onset potential for solar water splitting Reviewed

    Toshio Hayashi, Ryo Niishiro, Hitoshi Ishihara, Masaharu Yamaguchi, Qingxin Jia, Yongbo Kuang, Tomohiro Higashi, Akihide Iwase, Tsutomu Minegishi, Taro Yamada, Kazunari Domen, Akihiko Kudo

    Sustainable Energy & Fuels   2 ( 9 )   2016 - 2024   2018

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    DOI: 10.1039/C8SE00079D

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  • Nitrogen/fluorine-codoped rutile titania as a stable oxygen-evolution photocatalyst for solar-driven Z-scheme water splitting Reviewed

    Akinobu Miyoshi, Junie Jhon M. Vequizo, Shunta Nishioka, Yuma Kato, Muneaki Yamamoto, Shunsuke Yamashita, Toshiyuki Yokoi, Akihide Iwase, Shunsuke Nozawa, Akira Yamakata, Tomoko Yoshida, Koji Kimoto, Akihiko Kudo, Kazuhiko Maeda

    Sustainable Energy & Fuels   2 ( 9 )   2025 - 2035   2018

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    DOI: 10.1039/C8SE00191J

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  • Z-Schematic and visible-light-driven CO2 reduction using H2O as an electron donor by a particulate mixture of a Ru-complex/(CuGa)1−xZn2xS2 hybrid catalyst, BiVO4 and an electron mediator Reviewed International journal

    Tomiko M. Suzuki, Shunya Yoshino, Tomoaki Takayama, Akihide Iwase, Akihiko Kudo, Takeshi Morikawa

    Chemical Communications   54 ( 72 )   10199 - 10202   2018

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    DOI: 10.1039/C8CC05505J

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  • Enhanced H2 evolution over an Ir-doped SrTiO3 photocatalyst by loading of an Ir cocatalyst using visible light up to 800 nm Reviewed International journal

    Sho Suzuki, Hiroe Matsumoto, Akihide Iwase, Akihiko Kudo

    Chemical Communications   54 ( 75 )   10606 - 10609   2018

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    DOI: 10.1039/C8CC05344H

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  • Decomposition of an aqueous ammonia solution as a photon energy conversion reaction using a Ru-loaded ZnS photocatalyst Reviewed International journal

    Akihide Iwase, Kazutaka Ii, Akihiko Kudo

    Chemical Communications   54 ( 48 )   6117 - 6119   2018

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    DOI: 10.1039/C8CC02639D

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  • Phase relations in the pseudo ternary system In2O3-TiO2-BO (B: Zn, Co and Ni) at 1200 degrees C in air Reviewed

    Brown, Francisco, Edmundo Jacobo-Herrera, Ivan, Emmanuel Alvarez-Montano, Victor, Kimizuka, Noboru, Hirano, Tomonosuke, Sekine, Ryotaro, Denholme, Saleem J., Miyakawa, Nobuaki, Kudo, Akihiko, Iwase, Akihide, Michiue, Yuichi

    Journal of Solid State Chemistry   258   865 - 875   2018

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    DOI: 10.1016/j.jssc.2017.12.020

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  • Characterization of Rh:SrTiO3 photoelectrodes surface-modified with a cobalt clathrochelate and their application to the hydrogen evolution reaction Reviewed

    Manuel Antuch, Pierre Millet, Akihide Iwase, Akihiko Kudo, Sergey A. Grigoriev, Yan Z. Voloshin

    ELECTROCHIMICA ACTA   258   255 - 265   2017.12

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    DOI: 10.1016/j.electacta.2017.10.018

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  • Capturing local structure modulations of photoexcited BiVO4 by ultrafast transient XAFS. Reviewed International journal

    Yohei Uemura, Daiki Kido, Akihiro Koide, Yuki Wakisaka, Yasuhiro Niwa, Shunsuke Nozawa, Kohei Ichiyanagi, Ryo Fukaya, Shin-Ichi Adachi, Tetsuo Katayama, Tadashi Togashi, Shigeki Owada, Makina Yabashi, Keisuke Hatada, Akihide Iwase, Akihiko Kudo, Satoru Takakusagi, Toshihiko Yokoyama, Kiyotaka Asakura

    Chemical communications (Cambridge, England)   53 ( 53 )   7314 - 7317   2017.6

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  • Photocatalytic CO2 reduction using water as an electron donor by a powdered Z-scheme system consisting of metal sulfide and an RGO-TiO2 composite. Reviewed International journal

    Tomoaki Takayama, Ko Sato, Takehiro Fujimura, Yuki Kojima, Akihide Iwase, Akihiko Kudo

    Faraday discussions   198   397 - 407   2017.6

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  • Development of Ir and La-codoped BaTa2O6 photocatalysts using visible light up to 640 nm as an H2-evolving photocatalyst for Z-schematic water splitting. Reviewed International journal

    Akihide Iwase, Akihiko Kudo

    Chemical communications (Cambridge, England)   53 ( 45 )   6156 - 6159   2017.6

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  • Inorganic assembly catalysts for artificial photosynthesis: general discussion Reviewed

    Hiromu Kumagai, Leif Hammarstrom, Dong Ryeol Whang, Yuki Shinohara, Jose Martinez, Joshua Karlsson, Peter Summers, Christopher D. Windle, Masanori Kodera, Richard Cogdell, Kristine Rodulfo Tolod, Dogukan Hazar Apaydin, Etsuko Fujita, Alexander Kibler, Fengtao Fan, Elizabeth A. Gibson, Hisanao Usami, Akihide Iwase, Haruo Inoue, Akihiko Kudo, Devens Gust, Kazunari Domen, Flavia Cassiola, Katsuhiko Takagi, Sang Ook Kang, Akira Yamakata, Can Li, Licheng Sun, Hyunwoong Park, Young Soo Kang, Rengui Li, Fabio Di Fonzo, Tohru Setoyama, Osamu Ishitani

    FARADAY DISCUSSIONS   198   481 - 507   2017.6

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  • Efficient Solar Water Oxidation to Oxygen over Mo-doped BiVO4 Thin Film Photoanode Prepared by a Facile Aqueous Solution Route Reviewed

    Akihide Iwase, Satoru Ikeda, Akihiko Kudo

    CHEMISTRY LETTERS   46 ( 5 )   651 - 654   2017.5

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  • Development of Various Metal Sulfide Photocatalysts Consisting of d(0), d(5), and d(10) Metal Ions for Sacrificial H-2 Evolution under Visible Light Irradiation Reviewed

    Tomoaki Takayama, Issei Tsuji, Naruhiko Aono, Masamitsu Harada, Tsutomu Okuda, Akihide Iwase, Hideki Kato, Akihiko Kudo

    CHEMISTRY LETTERS   46 ( 4 )   616 - 619   2017.4

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    DOI: 10.1246/cl.161192

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  • Highly Active NaTaO3 -Based Photocatalysts for CO2 Reduction to Form CO Using Water as the Electron Donor. Reviewed International journal

    Haruka Nakanishi, Kosuke Iizuka, Tomoaki Takayama, Akihide Iwase, Akihiko Kudo

    ChemSusChem   10 ( 1 )   112 - 118   2017.1

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  • Solar Water Splitting Utilizing a SiC Photocathode, a BiVO4 Photoanode, and a Perovskite Solar Cell Reviewed International journal

    Iwase, Akihide, Kudo, Akihiko, Numata, Youhei, Ikegami, Masashi, Miyasaka, Tsutomu, Ichikawa, Naoto, Kato, Masashi, Hashimoto, Hideki, Inoue, Haruo, Ishitani, Osamu, Tamiaki, Hitoshi

    Chemsuschem   10 ( 22 )   4420 - 4423   2017

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    DOI: 10.1002/cssc.201701663

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  • A CoOx-modified SnNb2O6 photoelectrode for highly efficient oxygen evolution from water Reviewed International journal

    Ryo Niishiro, Yuichi Takano, Qingxin Jia, Masaharu Yamaguchi, Akihide Iwase, Yongbo Kuang, Tsutomu Minegishi, Taro Yamada, Kazunari Domen, Akihiko Kudo

    Chemical Communications   53 ( 3 )   629 - 632   2017

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  • Interfacing BiVO4 with Reduced Graphene Oxide for Enhanced Photoactivity: A Tale of Facet Dependence of Electron Shuttling Reviewed

    Hui Ling Tan, Hassan A. Tahini, Xiaoming Wen, Roong Jien Wong, Xin Tan, Akihide Iwase, Akihiko Kudo, Rose Amal, Sean C. Smith, Yun Hau Ng

    SMALL   12 ( 38 )   5295 - 5302   2016.10

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    DOI: 10.1002/smll.201601536

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  • Photoreduced Graphene Oxide as a Conductive Binder to Improve the Water Splitting Activity of Photocatalyst Sheets Reviewed

    Zhenhua Pan, Takashi Hisatomi, Qian Wang, Shanshan Chen, Akihide Iwase, Mamiko Nakabayashi, Naoya Shibata, Tsuyoshi Takata, Masao Katayama, Tsutomu Minegishi, Akihiko Kudo, Kazunari Domen

    ADVANCED FUNCTIONAL MATERIALS   26 ( 38 )   7011 - 7019   2016.10

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    DOI: 10.1002/adfm.201602657

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  • Water Splitting and CO2 Reduction under Visible Light Irradiation Using Z-Scheme Systems Consisting of Metal Sulfides, CoOx-Loaded BiVO4, and a Reduced Graphene Oxide Electron Mediator. Reviewed International journal

    Akihide Iwase, Shunya Yoshino, Tomoaki Takayama, Yun Hau Ng, Rose Amal, Akihiko Kudo

    Journal of the American Chemical Society   138 ( 32 )   10260 - 4   2016.8

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  • Visible-Light-Responsive CuLi1/3Ti2/3O2 Powders Prepared by a Molten CuCI Treatment of Li2TiO3 for Photocatalytic H-2 Evolution and Z-Schematic Water Splitting Reviewed

    Katsuya Iwashina, Akihide Iwase, Shunsuke Nozawa, Shin-ichi Adachi, Akihiko Kudo

    CHEMISTRY OF MATERIALS   28 ( 13 )   4677 - 4685   2016.7

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    DOI: 10.1021/acs.chemmater.6b01557

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  • In situ metal doping during modified anodization synthesis of Nb2O5 with enhanced photoelectrochemical water splitting Reviewed

    Chenyan Hu, Wey Yang Teoh, Shulin Ji, Changhui Ye, Akihide Iwase

    AICHE JOURNAL   62 ( 2 )   352 - 358   2016.2

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    DOI: 10.1002/aic.15048

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  • Solar-driven BiVO4 Photoanodes Prepared by a Facile Screen Printing Method Reviewed

    Akihide Iwase, Hiromi Ito, Qingxin Jia, Akihiko Kudo

    CHEMISTRY LETTERS   45 ( 2 )   152 - 154   2016.2

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    DOI: 10.1246/cl.150979

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  • Photoelectrochemical water oxidation using a Bi2MoO6/MoO3 heterojunction photoanode synthesised by hydrothermal treatment of an anodised MoO3 thin film Reviewed

    Shi Nee Lou, Jason Scott, Akihide Iwase, Rose Amal, Yun Hau Ng

    JOURNAL OF MATERIALS CHEMISTRY A   4 ( 18 )   6964 - 6971   2016

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    DOI: 10.1039/c6ta00700g

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  • Photocatalysis using a Wide Range of the Visible Light Spectrum: Hydrogen Evolution from Doped AgGaS2 Reviewed

    Kohei Yamato, Akihide Iwase, Akihiko Kudo

    CHEMSUSCHEM   8 ( 17 )   2902 - 2906   2015.9

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    DOI: 10.1002/cssc.201500540

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  • Photocatalytic Properties of Layered Metal Oxides Substituted with Silver by a Molten AgNO3 Treatment Reviewed

    Hirotaka Horie, Aldhide Iwase, Akihiko Kudo

    ACS APPLIED MATERIALS & INTERFACES   7 ( 27 )   14638 - 14643   2015.7

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    DOI: 10.1021/acsami.5b01555

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  • Controlled Loading of Small Au-n Clusters (n=10-39) onto BaLa4Ti4O15 Photocatalysts: Toward an Understanding of Size Effect of Cocatalyst on Water-Splitting Photocatalytic Activity Reviewed

    Yuichi Negishi, Yoshiki Matsuura, Ryota Tomizawa, Wataru Kurashige, Yoshiki Niihori, Tomoaki Takayama, Akihide Iwase, Akihiko Kudo

    JOURNAL OF PHYSICAL CHEMISTRY C   119 ( 20 )   11224 - 11232   2015.5

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    DOI: 10.1021/jp5122432

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  • Photocatalytic Water Splitting and CO2 Reduction over KCaSrTa5O15 Nanorod Prepared by a Polymerized Complex Method Reviewed

    Tomoaki Takayama, Akihide Iwase, Akihiko Kudo

    BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN   88 ( 4 )   538 - 543   2015.4

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    DOI: 10.1246/bcsj.20140350

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  • Surface Modification of CoOx Loaded BiVO4 Photoanodes with Ultrathin p-Type NiO Layers for Improved Solar Water Oxidation Reviewed

    Miao Zhong, Takashi Hisatomi, Yongbo Kuang, Jiao Zhao, Min Liu, Akihide Iwase, Qingxin Jia, Hiroshi Nishiyama, Tsutomu Minegishi, Mamiko Nakabayashi, Naoya Shibata, Ryo Niishiro, Chisato Katayama, Hidetaka Shibano, Masao Katayama, Akihiko Kudo, Taro Yamada, Kazunari Domen

    JOURNAL OF THE AMERICAN CHEMICAL SOCIETY   137 ( 15 )   5053 - 5060   2015.4

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    DOI: 10.1021/jacs.5b00256

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  • Utilization of Metal Sulfide Material of (CuGa)(1-x)Zn2xS2 Solid Solution with Visible Light Response in Photocatalytic and Photoelectrochemical Solar Water Splitting Systems Reviewed

    Takaaki Kato, Yuichiro Hakari, Satoru Ikeda, Qingxin Jia, Akihide Iwase, Akihiko Kudo

    JOURNAL OF PHYSICAL CHEMISTRY LETTERS   6 ( 6 )   1042 - 1047   2015.3

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    DOI: 10.1021/acs.jpclett.5b00137

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  • Photocatalytic Water Splitting over Rod-shaped K3Ta3Si2O13 and Block-shaped Ba3Ta6Si4O26 Prepared by Flux Method Reviewed

    Tomoaki Takayama, Akihide Iwase, Akihiko Kudo

    CHEMISTRY LETTERS   44 ( 3 )   306 - 308   2015.3

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    DOI: 10.1246/cl.141000

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  • Z-Schematic Water Splitting into H-2 and O-2 Using Metal Sulfide as a Hydrogen-Evolving Photocatalyst and Reduced Graphene Oxide as a Solid-State Electron Mediator Reviewed

    Katsuya Iwashina, Akihide Iwase, Yun Hau Ng, Rose Amal, Akihiko Kudo

    JOURNAL OF THE AMERICAN CHEMICAL SOCIETY   137 ( 2 )   604 - 607   2015.1

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  • Sensitization of wide band gap photocatalysts to visible light by molten CuCl treatment Reviewed

    Katsuya Iwashina, Akihide Iwase, Akihiko Kudo

    CHEMICAL SCIENCE   6 ( 1 )   687 - 692   2015

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    DOI: 10.1039/c4sc01829j

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  • Solar hydrogen evolution using a CuGaS2 photocathode improved by incorporating reduced graphene oxide Reviewed

    A. Iwase, Y. H. Ng, R. Amal, A. Kudo

    JOURNAL OF MATERIALS CHEMISTRY A   3 ( 16 )   8566 - 8570   2015

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    DOI: 10.1039/c5ta01237f

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  • Improvement of hydrogen evolution under visible light over Zn1-2x(CuGa)(x)Ga2S4 photocatalysts by synthesis utilizing a polymerizable complex method Reviewed

    Ciro Scheremeta Quintans, Hideki Kato, Makoto Kobayashi, Hiroshi Kaga, Akihide Iwase, Akihiko Kudo, Masato Kakihana

    JOURNAL OF MATERIALS CHEMISTRY A   3 ( 27 )   14239 - 14244   2015

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    DOI: 10.1039/c5ta02114f

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  • An effect of Ag(I)-substitution at Cu sites in CuGaS2 on photocatalytic and photoelectrochemical properties for solar hydrogen evolution Reviewed

    Hiroshi Kaga, Yuko Tsutsui, Akira Nagane, Akihide Iwase, Akihiko Kudo

    JOURNAL OF MATERIALS CHEMISTRY A   3 ( 43 )   21815 - 21823   2015

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    DOI: 10.1039/c5ta04756k

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  • Z-scheme water splitting under visible light irradiation over powdered metal-complex/semiconductor hybrid photocatalysts mediated by reduced graphene oxide Reviewed

    Tomiko M. Suzuki, Akihide Iwase, Hiromitsu Tanaka, Shunsuke Sato, Akihiko Kudo, Takeshi Morikawa

    JOURNAL OF MATERIALS CHEMISTRY A   3 ( 25 )   13283 - 13290   2015

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    DOI: 10.1039/c5ta02045j

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  • Enhanced Activity of BiVO4 Powdered Photocatalyst Under Visible Light Irradiation by Preparing Microwave-Assisted Aqueous Solution Methods Reviewed

    Kota Soma, Akihide Iwase, Akihiko Kudo

    CATALYSIS LETTERS   144 ( 11 )   1962 - 1967   2014.11

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    DOI: 10.1007/s10562-014-1361-y

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  • Water Splitting over CaTa4O11 and LaZrTa3O11 Photocatalysts with Laminated Structure Consisting of Layers of TaO6 Octahedra and TaO7 Decahedra Reviewed

    Motoki Matsui, Akihide Iwase, Hisayoshi Kobayashi, Akihiko Kudo

    CHEMISTRY LETTERS   43 ( 4 )   396 - 398   2014.4

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    DOI: 10.1246/cl.130944

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  • BiVO4-Ru/SrTiO3: Rh composite Z-scheme photocatalyst for solar water splitting Reviewed

    Qingxin Jia, Akihide Iwase, Akihiko Kudo

    CHEMICAL SCIENCE   5 ( 4 )   1513 - 1519   2014

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    DOI: 10.1039/c3sc52810c

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  • The KCaSrTa5O15 photocatalyst with tungsten bronze structure for water splitting and CO2 reduction Reviewed

    Tomoaki Takayama, Kentaro Tanabe, Kenji Saito, Akihide Iwase, Akihiko Kudo

    PHYSICAL CHEMISTRY CHEMICAL PHYSICS   16 ( 44 )   24417 - 24422   2014

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    DOI: 10.1039/c4cp03892d

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  • A visible light responsive rhodium and antimony-codoped SrTiO3 powdered photocatalyst loaded with an IrO2 cocatalyst for solar water splitting Reviewed

    Rikako Asai, Hiroaki Nemoto, Qingxin Jia, Kenji Saito, Akihide Iwase, Akihiko Kudo

    CHEMICAL COMMUNICATIONS   50 ( 19 )   2543 - 2546   2014

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    DOI: 10.1039/c3cc49279f

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  • Influence of Annealing Temperature of WO3 in Photoelectrochemical Conversion and Energy Storage for Water Splitting Reviewed

    Charlene Ng, Yun Hau Ng, Akihide Iwase, Rose Amal

    ACS APPLIED MATERIALS & INTERFACES   5 ( 11 )   5269 - 5275   2013.6

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    DOI: 10.1021/am401112q

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  • The effect of Au cocatalyst loaded on La-doped NaTaO3 on photocatalytic water splitting and O-2 photoreduction Reviewed

    Akihide Iwase, Hideki Kato, Akihiko Kudo

    APPLIED CATALYSIS B-ENVIRONMENTAL   136   89 - 93   2013.6

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    DOI: 10.1016/j.apcatb.2013.02.006

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  • Photocatalytically anchored bismuth vanadate on graphene sheets for water splitting Reviewed

    Yun Hau Ng, Iwase Akihide, Amal Rose

    ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY   245   2013.4

  • Photocatalysis of heat treated sodium- and hydrogen-titanate nanoribbons for water splitting, H-2/O-2 generation and oxalic acid oxidation Reviewed

    Kunlanan Kiatkittipong, Akihide Iwase, Jason Scott, Rose Amal

    CHEMICAL ENGINEERING SCIENCE   93   341 - 349   2013.4

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    DOI: 10.1016/j.ces.2013.02.001

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  • Understanding Self-Photorechargeability of WO3 for H-2 Generation without Light Illumination Reviewed

    Charlene Ng, Akihide Iwase, Yun Hau Ng, Rose Amal

    CHEMSUSCHEM   6 ( 2 )   291 - 298   2013.2

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    DOI: 10.1002/cssc.201200702

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  • Enhanced photocatalytic water splitting by BaLa4Ti4O15 loaded with similar to 1 nm gold nanoclusters using glutathione-protected Au-25 clusters Reviewed

    Yuichi Negishi, Masahiro Mizuno, Michiyo Hirayama, Mamiko Omatoi, Tomoaki Takayama, Akihide Iwase, Akihiko Kudo

    NANOSCALE   5 ( 16 )   7188 - 7192   2013

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    DOI: 10.1039/c3nr01888a

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  • Sustained solar hydrogen generation using a dye-sensitised NiO photocathode/BiVO4 tandem photo-electrochemical device Reviewed

    Lei Tong, Akihide Iwase, Andrew Nattestad, Udo Bach, Martin Weidelener, Guenther Goetz, Amaresh Mishra, Peter Baeuerle, Rose Amal, Gordon G. Wallace, Attila J. Mozer

    ENERGY & ENVIRONMENTAL SCIENCE   5 ( 11 )   9472 - 9475   2012.11

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    DOI: 10.1039/c2ee22866a

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  • Transforming Anodized WO3 Films into Visible-Light-Active Bi2WO6 Photoelectrodes by Hydrothermal Treatment Reviewed

    Charlene Ng, Akihide Iwase, Yun Hau Ng, Rose Amal

    JOURNAL OF PHYSICAL CHEMISTRY LETTERS   3 ( 7 )   913 - 918   2012.4

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    DOI: 10.1021/jz300179k

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  • Reduced Graphene Oxide as a Solid-State Electron Mediator in Z-Scheme Photocatalytic Water Splitting under Visible Light Reviewed

    Akihide Iwase, Yun Hau Ng, Yoshimi Ishiguro, Akihiko Kudo, Rose Amal

    JOURNAL OF THE AMERICAN CHEMICAL SOCIETY   133 ( 29 )   11054 - 11057   2011.7

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    DOI: 10.1021/ja203296z

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  • Flame Preparation of Visible-Light-Responsive BiVO4 Oxygen Evolution Photocatalysts with Subsequent Activation via Aqueous Route Reviewed

    Yung Kent Kho, Wey Yang Teoh, Akihide Iwase, Lutz Maedler, Akihiko Kudo, Rose Amarl

    ACS APPLIED MATERIALS & INTERFACES   3 ( 6 )   1997 - 2004   2011.6

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    DOI: 10.1021/am200247y

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  • Semiconductor/reduced graphene oxide nanocomposites derived from photocatalytic reactions Reviewed

    Yun Hau Ng, Akihide Iwase, Nicholas J. Bell, Akihiko Kudo, Rose Amal

    CATALYSIS TODAY   164 ( 1 )   353 - 357   2011.4

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    DOI: 10.1016/j.cattod.2010.10.090

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  • Photocatalytic Overall Water Splitting over ALi(2)Ti(6)O(14) (A: 2Na and Sr) with Tunneling Structure Reviewed

    Akihide Iwase, Wey Yang Teoh, Rose Amal

    CHEMISTRY LETTERS   40 ( 1 )   108 - 110   2011.1

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    DOI: 10.1246/cl.2011.108

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  • Visible light-induced charge storage, on-demand release and self-photorechargeability of WO3 film Reviewed

    Charlene Ng, Yun Hau Ng, Akihide Iwase, Rose Amal

    PHYSICAL CHEMISTRY CHEMICAL PHYSICS   13 ( 29 )   13421 - 13426   2011

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    DOI: 10.1039/c1cp20412b

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  • Reducing Graphene Oxide on a Visible-Light BiVO4 Photocatalyst for an Enhanced Photoelectrochemical Water Splitting Reviewed

    Yun Hau Ng, Akihide Iwase, Akihiko Kudo, Rose Amal

    JOURNAL OF PHYSICAL CHEMISTRY LETTERS   1 ( 17 )   2607 - 2612   2010.9

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    DOI: 10.1021/jz100978u

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  • A Simple Preparation Method of Visible-Light-Driven BiVO4 Photocatalysts From Oxide Starting Materials (Bi2O3 and V2O5) and Their Photocatalytic Activities Reviewed

    Akihide Iwase, Hideki Kato, Akihiko Kudo

    JOURNAL OF SOLAR ENERGY ENGINEERING-TRANSACTIONS OF THE ASME   132 ( 2 )   2010.5

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    DOI: 10.1115/1.4001172

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  • Photocatalytic H-2 Evolution over TiO2 Nanoparticles. The Synergistic Effect of Anatase and Rutile Reviewed

    Yung Kent Kho, Akihide Iwase, Wey Yang Teoh, Lutz Maedler, Akihiko Kudo, Rose Amal

    JOURNAL OF PHYSICAL CHEMISTRY C   114 ( 6 )   2821 - 2829   2010.2

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    DOI: 10.1021/jp910810r

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  • Photoelectrochemical water splitting using visible-light-responsive BiVO4 fine particles prepared in an aqueous acetic acid solution Reviewed

    Akihide Iwase, Akihiko Kudo

    JOURNAL OF MATERIALS CHEMISTRY   20 ( 35 )   7536 - 7542   2010

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    DOI: 10.1039/c0jm00961j

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  • Time-Resolved Infrared Absorption Study of NaTaO3 Photocatalysts Doped with Alkali Earth Metals Reviewed

    Motoji Maruyama, Akihide Iwase, Hideki Kato, Akihiko Kudo, Hiroshi Onishi

    JOURNAL OF PHYSICAL CHEMISTRY C   113 ( 31 )   13918 - 13923   2009.8

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    DOI: 10.1021/jp903142n

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  • Sensitization of NaMO3 (M: Nb and Ta) Photocatalysts with Wide Band Gaps to Visible Light by Ir Doping Reviewed

    Akihide Iwase, Kenji Saito, Akihiko Kudo

    BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN   82 ( 4 )   514 - 518   2009.4

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    DOI: 10.1246/bcsj.82.514

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  • The Effect of Alkaline Earth Metal Ion Dopants on Photocatalytic Water Splitting by NaTaO3 Powder Reviewed

    Akihide Iwase, Hideki Kato, Akihiko Kudo

    CHEMSUSCHEM   2 ( 9 )   873 - 877   2009

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    DOI: 10.1002/cssc.200900160

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  • The effect of co-catalyst for Z-scheme photocatalysis systems with an Fe3+/Fe2+ electron mediator on overall water splitting under visible light irradiation Reviewed

    Yasuyoshi Sasaki, Akihide Iwase, Hideki Kato, Akihiko Kudo

    JOURNAL OF CATALYSIS   259 ( 1 )   133 - 137   2008.10

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    DOI: 10.1016/j.jcat.2008.07.017

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  • Loading effects of silver oxides upon generation of reactive oxygen species in semiconductor photocatalysis Reviewed

    Shigeru Kohtani, Kazuhiro Yoshida, Toshiyasu Maekawa, Akihide Iwase, Akihiko Kudo, Hideto Miyabe, Ryoichi Nakagaki

    PHYSICAL CHEMISTRY CHEMICAL PHYSICS   10 ( 20 )   2986 - 2992   2008

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    DOI: 10.1039/b719913a

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  • Role of iron ion electron mediator on photocatalytic overall water splitting under visible light irradiation using Z-scheme systems Reviewed

    Hideki Kato, Yasuyoshi Sasaki, Akihide Iwase, Akihiko Kudo

    BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN   80 ( 12 )   2457 - 2464   2007.12

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    DOI: 10.1246/bcsj.80.2457

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  • Effects of doping of metal cations on morphology, activity, and visible light response of photocatalysts Reviewed

    Akihiko Kudo, Ryo Niishiro, Akihide Iwase, Hideki Kato

    CHEMICAL PHYSICS   339 ( 1-3 )   104 - 110   2007.10

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    DOI: 10.1016/j.chemphys.2007.07.024

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  • Nanosized Au particles as an efficient cocatalyst for photocatalytic overall water splitting Reviewed

    A Iwase, H Kato, A Kudo

    CATALYSIS LETTERS   108 ( 1-2 )   7 - 10   2006.4

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    DOI: 10.1007/s10562-006-0030-1

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  • A Novel Photodeposition Method in the Presence of Nitrate Ions for Loading of an Iridium Oxide Cocatalyst for Water Splitting Reviewed

    A. Iwase, H. Kato, A. Kudo

    CHEMISTRY LETTERS   34 ( 7 )   945 - 946   2005.6

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  • Formation of surface nano-step structures and improvement of photocatalytic activities of NaTaO3 by doping of alkaline earth metal ions Reviewed

    A Iwase, H Kato, H Okutomi, A Kudo

    CHEMISTRY LETTERS   33 ( 10 )   1260 - 1261   2004.10

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Awards

  • 奨励賞

    2018.9   光化学協会  

    岩瀬 顕秀

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  • 奨励賞

    2018.3   触媒学会  

    岩瀬 顕秀

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Research Projects

  • Design of semiconductor photocatalysts and photocatalyst systems for highly efficient artificial photosynthesis

    Grant number:19H02819  2019.4 - 2023.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

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    Grant amount:\17420000 ( Direct Cost: \13400000 、 Indirect Cost:\4020000 )

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  • Solar water splitting using metal sulfide-based photocatalyst and photoelectrode systems

    Grant number:26820354  2014.4 - 2016.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Young Scientists (B)

    Iwase Akihide

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    Grant amount:\4030000 ( Direct Cost: \3100000 、 Indirect Cost:\930000 )

    Photocatalytic water splitting is an artificial photosynthetic reaction in which solar energy is converted to chemical energy. Many metal sulfides efficiently produce hydrogen from water under visible light irradiation. However, the metal sulfides was considered to be unfavorable for water splitting, because they are not stable under photoirradiation (photocorrosion). In the present study, we developed water splitting systems utilizing metal sulfide photocatalyst and photoelectordes upon combining with suitable photoatalysts for oxygen evolution.

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