CV和Tafel曲线对稀土掺杂Ti/SnO_2-Sb电极电催化性能研究  

Research on electrocatalytic properties of rare earth doped Ti/SnO_2-Sb electrodes by CV and Tafel curves

作　　者：冯玉杰[1] 丁海洋[1] 张文军[1] 

机构地区：[1]哈尔滨工业大学环境科学与工程系,哈尔滨150090

出　　处：《材料科学与工艺》2009年第2期278-280,284,共4页Materials Science and Technology

基　　金：国家自然科学基金资助项目(50278022);黑龙江省杰出青年基金资助项目(JC-02-04)

摘　　要：采用热分解法制备了稀土Dy、Nd、Eu及Gd掺杂Ti/SnO2-Sb电极,以苯酚为目标有机物,研究了所制备电极降解有机物的性能.在500 mg/L苯酚溶液中进行了所制备电催化电极的循环伏安(CV)特性分析,研究发现4种稀土(Dy、Nd、Eu和Gd)掺杂电极中苯酚在Nd掺杂Ti/SnO2-Sb(Ti/SnO2-Sb-Nd)电极上的直接氧化的峰电流最高,为4.46 mA/cm2.在0.5 mol/L的H2SO4溶液中进行了Tafel曲线测试,4种稀土掺杂Ti/SnO2-Sb电极的析氧电位分别为2.293、2.313、2.277、2.263 V(vs.Ag/AgCl).结果表明,所制备的4种稀土掺杂电极降解苯酚的性能与采用CV和Tafel曲线方法分析的结果一致,可以采用电化学方法评价电极的电催化氧化性能.Thermal decomposition process was introduced to prepare rare earth （Dy, Nd, Eu and Gd） doped Ti/SnO2 - Sh electrodes. Taking phenol as model organics, the properties of electrocatalytic degradation of the organic were evaluated. Cyclic voltammetry （CV） of the prepared electrocatalytic electrodes was tested in 500 mg/L phenol solution, and the oxidation peak of 4.46 mA/cm^2 was achieved for Nd doped Ti/SnO2 - Sb （Ti/SnO2 -Sb -Nd） electrode. The Tafel curves were tested in 0. 5 mol/L H2SO4 solution. The results exhibit that the oxygen evolution potentials of Dy, Nd, Eu and Gd doped Ti/SnO2 - Sb electrodes are 2. 293, 2. 313, 2. 277 and 2. 263 （vs. Ag/AgCl） , respectively. The behaviors for catalytic degradation of phenol obtained by electrodes correspond to those obtained by CV and Tafel curves, which indicates that the electro-chemical technique can be applied to evaluate the electrocatalytic oxidation performance of electrodes.

关 键 词：苯酚 SnO2电极 循环伏安 Tafel曲线 稀土 

分 类 号：O646[理学—物理化学]