铽氧化物电极表面的XPS和电化学循环伏安分析  

XPS and Cyclic Voltammetric Surface Characterization of Tb Oxide Electrocatalysts

作　　者：谢中[1] 刘业翔[1] 

机构地区：[1]中南工业大学冶金系,湖南长沙410083

出　　处：《中国稀土学报》2000年第3期216-219,共4页Journal of the Chinese Society of Rare Earths

基　　金：国家自然科学基金! ( 960 4 0 0 5)资助项目

摘　　要：以热分解工艺制备铽氧化物电极 ,采用XPS和电化学循环伏安法分析铽氧化物的表面特征和在 70 0℃高温NaCl KCl熔体中析氯过程的行为。XPS分析表明 ,热分解产物表面成分为非化学计量、有结构缺陷的混合价态铽氧化物 ;电极表面的循环极化反映出Cl- 的特性吸附和电解质中电极表面结构变化过程 ;循环伏安分析揭示了表面氧化物的氧化还原行为及在电催化过程中的作用。通过测定循环伏安电量研究电催化剂制备时温度的影响 ,并进行电化学活性表面的相对测量和活性层表面微观结构变化的实时监控。The surface characteristics and electrochemical behaviors of Tb 4O 7 layers deposited on graphite by thermal decomposition were investigated by means of XPS and cyclic voltammetry at 700 ℃ in NaCl KCl melts. XPS analysis indicates that thermal decomposition products are mainly non stoichiometric oxide with defective structure. Cyclic polarization on oxide electrode reflects the specific adsorption of Cl - and structural modification of oxide surface. Analysis based on the features of the voltammograms reveals the redox behaviors of Tb oxide layer with different valency states and its correspending electrocatalytic activity. The variation of voltammetric charge was used to characterize the temperature effect and to measure the electrochemical active surface area and monitor the modification of active surface.

关 键 词：电催化 铽氧化物 电极 XPS 电化学循环伏安 

分 类 号：O614.341[理学—无机化学] O646.54[理学—化学]