Journal
CATALYSIS SCIENCE & TECHNOLOGY
Volume 6, Issue 7, Pages 2206-2213Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5cy01634g
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Funding
- National Environment Agency, Singapore under Environment Technology Research Programme (ETRP) [ETRP 1002 103]
- Singapore National Research Foundation (NRF) through Singapore-Berkeley Research Initiative for Sustainable Energy (SinBeRISE) CREATE Programme
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Developing efficient photocatalysts with noble-metal-free co-catalysts for visible-light-driven photocatalytic H-2 evolution from water is appealing yet remains challenging. Herein, by supporting CdS QDs with diameters smaller than 5 nm and tungsten carbide (WC) on TiO2, a CdS/WC/TiO2 photocatalyst was fabricated for visible-light-driven photocatalytic H2 evolution from aqueous solution containing lactic acid as an electron donor. The optimal H-2 evolution rate on CdS/WC/TiO2 (624.9 mu mol h(-1)) is comparable to the H-2 evolution rate on CdS/Pt/TiO2 (636.2 mu mol h(-1)), indicating that WC is a good candidate to substitute Pt as the co-catalyst. Formation of an anatase-rutile composite TiO2 with a rutile content of 68.7% makes great contribution to the efficient H-2 evolution on CdS/WC/TiO2. The rutile-anatase composite TiO2 promotes the separation of the photogenerated electron-hole pairs and thereby benefits the efficient H-2 evolution reaction. The present work is expected to be helpful in designing efficient noble-metal-free photocatalysts for H-2 evolution from visible-light-driven photocatalytic water splitting.
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