Electrochemical water oxidation by photo-deposited cobalt-based catalyst on a nano-structured TiO_(2) electrode  

作　　者：LI Lin SUN LiCheng 

机构地区：[1]Department of Chemistry,School of Chemical Science and Engineering,KTH Royal Institute of Technology,Stockholm 10044,Sweden [2]DUT-KTH Joint Education and Research Center of Molecular Devices,State Key Laboratory of Fine Chemicals,Dalian University of Technology,Dalian 116024,China

出　　处：《Science China Chemistry》2012年第9期1976-1981,共6页中国科学(化学英文版)

基　　金：supported by Swedish Energy Agency,the Knutand Alice Wallenberg Foundation,China Scholarship Council (CSC);the Natural Natural Science Foundation of China (21120102036);the National Basic Research Program of China (2009CB220009)

摘　　要：A cobalt-based catalyst was directly photo-deposited on the surface of a widely used n-type nano-structured semiconductor(TiO_(2)).Different thicknesses of the TiO 2 films as well as different time of photo-deposition of the Co-based catalyst on TiO_(2) films have been optimized.It was found that the electrode with 3 layers of TiO_(2) film(in 8 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(~5 mA/cm^(2)).Using this cobalt-modified TiO_(2) 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.A cobalt-based catalyst was directly photo-deposited on the surface of a widely used n-type nano-structured semiconductor(TiO_(2)).Different thicknesses of the TiO 2 films as well as different time of photo-deposition of the Co-based catalyst on TiO_(2) films have been optimized.It was found that the electrode with 3 layers of TiO_(2) film(in 8 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(~5 mA/cm^(2)).Using this cobalt-modified TiO_(2) 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.

关 键 词：artificial photosynthesis electrochemical water oxidation cobalt-based catalyst photo-deposition water splitting 

分 类 号：O643.36[理学—物理化学]