Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 54, Issue 21, Pages 6211-6216Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201502573
Keywords
cobalt selenide; hydrogen evolution; nanorods; semi-metals; water splitting
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Funding
- Ministry of Science, Technology of Taiwan [MOST 103-2112M-003-009-MY3, MOST 101-2113M-002-014-MY3]
- Academia Sinica [AS-103-TP-A06]
- National Natural Science Foundation of China [11204393]
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Development of a solar water splitting device requires design of a low-cost, efficient, and non-noble metal compound as alternative to noble metals. For the first time, we showed that CoSe2 can function as co-catalyst in phototoelectrochemical hydrogen production. We designed a heterostructure of p-Si and marcasite-type CoSe2 for solar-driven hydrogen production. CoSe2 successively coupled with p-Si can act as a superior photocathode in the solar-driven water splitting reaction. Photocurrents up to 9mAcm(-2) were achieved at 0V vs. reversible hydrogen electrode. Electrochemical impedance spectroscopy showed that the high photocurrents can be attributed to low charge transfer resistance between the Si and CoSe2 interfaces and that between the CoSe2 and electrolyte interfaces. Our results suggest that this CoSe2 is a promising alternative co-catalyst for hydrogen evolution.
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