Journal
ENERGY & ENVIRONMENTAL SCIENCE
Volume 5, Issue 8, Pages 8390-8397Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2ee21801a
Keywords
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Funding
- PRESTO/JST
- Ministry of Education, Culture, Sports, Science and Technology (MEXT) of Japan
- KAITEKI Institute, Inc.
- Grants-in-Aid for Scientific Research [23000009] Funding Source: KAKEN
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Tungsten trioxide (WO3) powder was studied as a photocatalyst for water oxidation under visible light (lambda > 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 approximate to 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.
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