Heterostructure of Si and CoSe2: A promising photocathode based on a non-noble metal catalyst for photoelectrochemical hydrogen evolution

Mrinmoyee Basu, Zhi Wei Zhang, Chih Jung Chen, Po Tzu Chen, Kai Chih Yang, Chong Geng Ma, Chun Che Lin, Shu Fen Hu, Ru Shi Liu

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88 Citations (Scopus)

Abstract

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 9 mA cm-2 were achieved at 0 V 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.

Original languageEnglish
Pages (from-to)6211-6216
Number of pages6
JournalAngewandte Chemie - International Edition
Volume54
Issue number21
DOIs
Publication statusPublished - May 18 2015
Externally publishedYes

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Keywords

  • cobalt selenide
  • hydrogen evolution
  • nanorods
  • semi-metals
  • water splitting

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)

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