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

Kenta Watanabe; Akihide Iwase; Akihiko Kudo

doi:10.1039/C9SC05909A

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Solar water splitting over Rh_0.5Cr_1.5O₃-loaded AgTaO₃ of a valence-band-controlled metal oxide photocatalyst†

Kenta Watanabe,^a Akihide Iwase

^ab and Akihiko Kudo

*^ab

Author affiliations

* Corresponding authors

^a Department of Applied Chemistry, Faculty of Science, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku-ku, Tokyo 162-8601, Japan
E-mail: a-kudo@rs.tus.ac.jp

^b Photocatalysis International Research Center, Research Institute for Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda-shi, Chiba-ken 278-8510, Japan

Abstract

Improvement of water splitting performance of AgTaO₃ (BG 3.4 eV) of a valence-band-controlled photocatalyst was examined. Survey of cocatalysts revealed that a Rh_0.5Cr_1.5O₃ cocatalyst was much more effective than Cr₂O₃, RuO₂, NiO and Pt for water splitting into H₂ and O₂ in a stoichiometric amount. The optimum loading amount of the Rh_0.5Cr_1.5O₃ cocatalyst was 0.2 wt%. The apparent quantum yield (AQY) at 340 nm of the optimized Rh_0.5Cr_1.5O₃(0.2 wt%)/AgTaO₃ photocatalyst reached to about 40%. Rh_0.5Cr_1.5O₃(0.2 wt%)/AgTaO₃ gave a solar to hydrogen conversion efficiency (STH) of 0.13% for photocatalytic water splitting under simulated sunlight irradiation. Bubbles of gasses evolved by the solar water splitting were visually observed under atmospheric pressure at room temperature.

This article is part of the themed collections: 2020 ChemSci Pick of the Week Collection and 2020 Chemical Science HOT Article Collection

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Article information

DOI: https://doi.org/10.1039/C9SC05909A
Article type: Edge Article
Submitted: 21 Nov 2019
Accepted: 28 Jan 2020
First published: 28 Jan 2020
This article is Open Access

All publication charges for this article have been paid for by the Royal Society of Chemistry

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Chem. Sci., 2020,11, 2330-2334

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Solar water splitting over Rh_0.5Cr_1.5O₃-loaded AgTaO₃ of a valence-band-controlled metal oxide photocatalyst

K. Watanabe, A. Iwase and A. Kudo, Chem. Sci., 2020, 11, 2330 DOI: 10.1039/C9SC05909A

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