期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 53, 期 39, 页码 10350-10354出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201404926
关键词
electrochemistry; localized surface plasmons; nanostructures; photochemistry; water splitting
资金
- Ministry of Education, Culture, Sports, Science, and Technology of Japan: KAKENHI [23225006]
- Japan Society for the Promotion of Science (JSPS) [25107501]
- Nanotechnology Platform (Hokkaido University)
- Low-Carbon Research Network of Japan
- China Scholarship Council (CSC)
- Grants-in-Aid for Scientific Research [26248001, 26620188, 25107501, 23225006, 25109701] Funding Source: KAKEN
A plasmon-induced water splitting system that operates under irradiation by visible light was successfully developed; the system is based on the use of both sides of the same strontium titanate (SrTiO3) single-crystal substrate. The water splitting system contains two solution chambers to separate hydrogen (H-2) and oxygen (O-2). To promote water splitting, a chemical bias was applied by regulating the pH values of the chambers. The quantity of H-2 evolved from the surface of platinum, which was used as a reduction co-catalyst, was twice the quantity of O-2 evolved from an Au-nanostructured surface. Thus, the stoichiometric evolution of H-2 and O-2 was clearly demonstrated. The hydrogen-evolution action spectrum closely corresponds to the plasmon resonance spectrum, indicating that the plasmon-induced charge separation at the Au/SrTiO3 interface promotes water oxidation and the subsequent reduction of a proton on the backside of the SrTiO3 substrate. The chemical bias is significantly reduced by plasmonic effects, which indicates the possibility of constructing an artificial photosynthesis system with low energy consumption.
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