Influence of rare earths doping on the structure and electro-catalytic performance of Ti/Sb-SnO2 electrodes

被引:135
作者
Cui, Yu-Hong [1 ,2 ]
Feng, Yu-Jie [2 ]
Liu, Zheng-Qian [1 ]
机构
[1] Huazhong Univ Sci & Technol, Sch Environm Sci & Engn, Wuhan 430074, Peoples R China
[2] Harbin Inst Technol, Sch Municipal & Environm Engn, Harbin 150090, Peoples R China
关键词
SnO2; electrode; Rare earth; Phenol; Electrochemical degradation; Hydroxyl radical; HIGH OVERVOLTAGE ANODES; SNO2; THIN-FILMS; ELECTROCHEMICAL OXIDATION; LEAD DIOXIDE; PHENOL; ACID; DESTRUCTION; DEGRADATION; OXYGEN; OZONE;
D O I
10.1016/j.electacta.2009.04.041
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
Rare earth Ce. Eu, Gd and Dy doped Ti/Sb-SnO2 electrodes were prepared by thermal decomposition and the performance of electrodes for the electro-catalytic decomposition of a model pollutant (phenol) was investigated. Phenol degradation and TOC removal followed pseudo-first-order kinetics in the experimental range, with the maximum rate achieved using Gd-doped electrode and the minimum rate obtained by Ce-doped electrode. Electrodes were characterized by cyclic voltammetry, X-ray diffraction, electron dispersive spectrometry, and X-ray photoelectron spectroscopy. It was suggested that the enhanced performance of the Gd-doped Ti/Sb-SnO2 electrode arose from the increased adsorption capacity of hydroxyl radicals on the electrode surface and the lower mobility of oxygen atoms in SnO2 lattice. The redox couple of Ce4+/Ce3+ on Ce-doped Ti/Sb-SnO2 electrode surface functioned as mediators in the electrochemical oxidation process, allowing oxygen transfer in the SnO2 lattice, and lowered the electro-catalytic ability of the electrode on phenol mineralization. (C) 2009 Elsevier Ltd. All rights reserved.
引用
收藏
页码:4903 / 4909
页数:7
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