(中南工业大学 冶金科学与工程系, 长沙 410083)
摘 要: 在700 ℃的高温氯化物熔盐中采用电化学暂态技术， 结合SEM和XPS等表面物理检测手段，对稀土铽氧化物电极的表面物理化学和电化学表面特性进行表征。结果表明，热分解产物为非化学计量的混合价态铽氧化物， 电极表面结构显微观“龟裂”状态。 稀土铽氧化物高温析氯电催化作用的氧化还原机理是变价Tb氧化物在电极表面起活性中心的作用， 能降低Cl析出活化能。 从稀土电子结构因素对稀土氧化物的电催化活性进行了解释，并对稀土化合物作为电催化剂的性能进行预测。
关键字: 电催化； 氯电极反应； 稀土电催化剂；氯化物熔体
Tb oxide in chloride melts at high temperature
（Department of Metallurgical Science and Engineering，Central South University of Technology， Changsha 410083, P.R.China）
Abstract:The surface physicochemical and electrochemicalfeatures of Tb oxide electrode in chloride melts at 700 ℃ were characterized by SEM, XPS and electrochemical transient techniques. Testing results revealed the electrocatalytic behaviors of chlorine evolution on Tb oxide to be the redox mechanism. In addition, an attempt was made to elucidate the electronic factors responsible for electrocatalytic activity for chlorine evolution on rare earth metal oxides, laying a prediction for the choice of potential RE electrocatalysts.
Key words: electrocatalysis; chlorine evolution reaction;rare earth electrocatalyst; chloride melts
