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论文类型：期刊论文

发表时间：2012-09-01

发表刊物：SCIENCE CHINA-CHEMISTRY

收录刊物：SCIE、EI、Scopus

卷号：55

期号：9

页面范围：1976-1981

ISSN号：1674-7291

关键字：artificial photosynthesis; electrochemical water oxidation; cobalt-based catalyst; photo-deposition; water splitting

摘要：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.