Details

Autor(en) / Beteiligte

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

Titel

Heterostructure of Si and CoSe2: A Promising Photocathode Based on a Non-noble Metal Catalyst for Photoelectrochemical Hydrogen Evolution

Ist Teil von

• Angewandte Chemie (International ed.), 2015-05, Vol.54 (21), p.6211-6216

Auflage

International ed. in English

Ort / Verlag

Weinheim: WILEY-VCH Verlag

Erscheinungsjahr

2015

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• 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. Heterostructures of semi‐metallic CoSe2 nanorods and p‐Si microwires behave as an efficient photocathode for the solar‐driven hydrogen evolution reaction. Photocurrents as high as 9 mA cm−2 have been achieved at 0 V vs. reversible hydrogen electrode. The high photocurrents can be attributed to low charge transfer resistance between the Si and CoSe2 interfaces and between the CoSe2 and electrolyte interfaces.