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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 9    No. 2    June 1999

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ELECTROCATALYTIC BEHAVIORS OF CER ON SOME METAL OXIDES IN
Xie Zhong and Liu Yexiang

Department ofNonferrous Metallurgy,Central South University of Technology, Changsha 410083, P. R. China

Abstract:The polarization behaviors of various oxide electrodes prepared on graphite substrate by thermal decomposition procedure have been investigated by linear sweep voltammetry in chloride melt at 700℃.Experimental results showed that some oxides have obvious electrocatalytic activity for chlorine evolution, lowering anodic overpotential up to 80~110mV at a current density of 0.6A/cm2. The kinetic analysis of steady stateJ-Edata in terms of Tafel slopes and chronocoulumetric measuring inferred that the mechanisms of CER on RE oxide electrodes was atom+ion route, with Heyrovsky reaction (Clads+Cl-→Cl2+e) being the ratedetermining step, and the adsorption of intermediate species Cladsobeying no-activated Temkin condition.

 

Key words: chlorine evolution reaction electrocatalysis chloride melt oxide electrode

ISSN 1672-7029
CN 43-1423/U

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