CuInS2 as Photocatalyst for H2 Evolution: Polyvinylpyrrolidone-Assisted Solvothermal Route to Tuned Microstructures Toward High Performance Photocatalysts
CuInS2 particles were synthesized by a polyvinylpyrrolidone (PVP)-assisted solvothermal route in ethylene glycol with metal chlorides as precursor. The microstructure of CuInS2 can be tuned from flower- to sphere-like aggregations by increasing the dosage of PVP, with the increased diffraction peak intensity ratio of (220) versus (112). A possible formation mechanism of these CuInS2 particles was proposed, indicating that PVP plays a crucial role in the growth of structured CuInS2. The photocatalytic H2 evolution performance was found to be enhanced with the increasing intensity ratio of (220) versus (112), rather than the specific surface area. Our work shows that (200) facet of CuInS2 possess more active sites for H2 evolution than (004) facet.
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Document Type: Research Article
Publication date: December 1, 2014
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