Hits:

Indexed by:期刊论文

Date of Publication:2012-09-01

Journal:SCIENCE CHINA-CHEMISTRY

Included Journals:SCIE、EI、Scopus

Volume:55

Issue:9

Page Number:1976-1981

ISSN No.:1674-7291

Key Words:artificial photosynthesis; electrochemical water oxidation; cobalt-based catalyst; photo-deposition; water splitting

Abstract:A cobalt-based catalyst was directly photo-deposited on the surface of a widely used n-type nano-structured semiconductor (TiO2). Different thicknesses of the TiO2 films as well as different time of photo-deposition of the Co-based catalyst on TiO2 films have been optimized. It was found that the electrode with 3 layers of TiO2 film (in 8 mu m thickness) and 1 hour photo-deposition of the cobalt-based catalyst by light irradiation from a 500 W Xenon lamp gave the highest current density (similar to 5 mA/cm(2)). Using this cobalt-modified TiO2 film as a working electrode in an electrochemical device, highly efficient water oxidation has been demonstrated in a pH 7.0 aqueous solution with low overpotential.