(中南工業(yè)大學(xué) 冶金科學(xué)與工程系, 長沙 410083)
摘 要: 在700 ℃的高溫氯化物熔鹽中采用電化學(xué)暫態(tài)技術(shù), 結(jié)合SEM和XPS等表面物理檢測手段,對稀土鋱氧化物電極的表面物理化學(xué)和電化學(xué)表面特性進(jìn)行表征。結(jié)果表明,熱分解產(chǎn)物為非化學(xué)計(jì)量的混合價(jià)態(tài)鋱氧化物, 電極表面結(jié)構(gòu)顯微觀“龜裂”狀態(tài)。 稀土鋱氧化物高溫析氯電催化作用的氧化還原機(jī)理是變價(jià)Tb氧化物在電極表面起活性中心的作用, 能降低Cl析出活化能。 從稀土電子結(jié)構(gòu)因素對稀土氧化物的電催化活性進(jìn)行了解釋,并對稀土化合物作為電催化劑的性能進(jìn)行預(yù)測。
關(guān)鍵字: 電催化; 氯電極反應(yīng); 稀土電催化劑;氯化物熔體
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


