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Issue 8, 2012
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Visible-light-driven nonsacrificial water oxidation over tungsten trioxide powder modified with two different cocatalysts

Su Su Khine Ma,a  Kazuhiko Maeda,*ab  Ryu Abec  and  Kazunari Domen*a 
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* Corresponding authors

a Department of Chemical System Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
E-mail: kmaeda@chemsys.t.u-tokyo.ac.jp, domen@chemsys.t.u-tokyo.ac.jp
Fax: +81-3-5841-8838
Tel: +81-3-5841-1148

b Precursory Research for Embryonic Science and Technology (PRESTO), Japan Science and Technology Agency (JST), 4-1-8 Honcho Kawaguchi, Saitama 332-0012, Japan

c Catalysis Research Center, Hokkaido University, North 21, West 10, Sapporo 001-0021, Japan

Abstract

Tungsten trioxide (WO3) powder was studied as a photocatalyst for water oxidation under visible light (λ > 420 nm). WO3 modified with nanoparticulate Pt species (more specifically, PtOx) as cocatalysts is capable of photocatalyzing water oxidation under visible light in the presence of iodate (IO3−) ions as an electron acceptor under near-neutral pH conditions (pH ≈ 5.9). When PtOx/WO3 was further modified with a very small amount (0.001 wt%) of a metal oxide (e.g., MnOx, CoOx, RuO2 or IrO2) as a secondary cocatalyst, the water oxidation activity was improved. Among the metal oxide cocatalysts examined, RuO2 was found to give the highest performance, with an apparent quantum yield of 14.4% at 420 nm. The results of photocatalytic reactions and photoelectrochemical analyses suggest that the main roles of the loaded PtOx and RuO2 on WO3 are to promote the reduction of IO3− and water oxidation, respectively.

Graphical abstract: Visible-light-driven nonsacrificial water oxidation over tungsten trioxide powder modified with two different cocatalysts

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Publication details

The article was received on 30 Mar 2012, accepted on 22 May 2012 and first published on 23 May 2012


Article type: Paper
DOI: 10.1039/C2EE21801A
Citation: Energy Environ. Sci., 2012,5, 8390-8397
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    Visible-light-driven nonsacrificial water oxidation over tungsten trioxide powder modified with two different cocatalysts

    S. S. K. Ma, K. Maeda, R. Abe and K. Domen, Energy Environ. Sci., 2012, 5, 8390
    DOI: 10.1039/C2EE21801A

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