期刊
CHEMSUSCHEM
卷 7, 期 11, 页码 3112-3121出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.201402525
关键词
copper; gallium; hydrogen; indium; photochemistry
资金
- Saudi Aramco [6600024505/01]
The synthesis of quaternary metal sulfide (QMS) nanocrystals is challenging because of the difficulty to control their stoichiometry and phase structure. Herein, quaternary CuGa2In3S8 photocatalysts with a primary particle size of approximate to 4nm are synthesized using a facile hot-injection method by fine-tuning the sulfur source injection temperature and aging time. Characterization of the samples reveals that quaternary CuGa2In3S8 nanocrystals exhibit n-type semiconductor characteristics with a transition band gap of approximate to 1.8eV. Their flatband potential is located at -0.56V versus the standard hydrogen electrode at pH6.0 and is shifted cathodically by 0.75V in solutions with pH values greater than 12.0. Under optimized conditions, the 1.0wt% Ru-loaded CuGa2In3S8 photocatalyst exhibits a photocatalytic H-2 evolution response up to 700nm and an apparent quantum efficiency of (6.9 +/- 0.5)% at 560nm. These results indicate clearly that QMS nanocrystals have great potential as nano-photocatalysts for solar H-2 production.
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