电化学2006，Vol.12Issue(4)：368-372,5.
V(Ⅳ)/V(Ⅴ)电对在石墨毡与导电塑料复合电极上的反应机理
Reaction Mechanism of V (Ⅳ) / V (Ⅴ) Redox Couple at Graphite Felt Composite Electrode Bonded with Conductive Carbon Plastic
摘要
Abstract
The rate-determining step of V(Ⅳ) / V(Ⅴ) redox reaction was investigated at graphite felt (GF) composite electrode by various techniques: cyclic voltammetry, polarization curve and impedance spectroscopy. Cyclic voltammetry analysis indicated that V(Ⅳ) / V(Ⅴ) redox reaction at GF electrode is quasi reversible. A certain chemical reaction step is suspected to follow the electron transfer step of this reaction. The Tafel slope value (0.124) obtained from the polarization curve agrees well with theoretical value (0.12), which supposing the electron transfer step was the rate-determining step. Impedance Spectroscopies at various potentials were studied and simulated by equivalent circuits. The impedance value of the electron transfer step modified is greatly higher than the others, which shows that the electron transfer step is the rate-determining step. This further confirms the conclusion obtained by polarization curve test.关键词
石墨毡/控制步骤/钒电池/V(Ⅳ)/V(Ⅴ)Key words
graphite felt/rate-determining step/vanadium redox battery/V(Ⅳ) / V(Ⅴ)分类
化学化工引用本文复制引用
李晓刚,黄可龙,刘素琴,谭宁,陈立泉..V(Ⅳ)/V(Ⅴ)电对在石墨毡与导电塑料复合电极上的反应机理[J].电化学,2006,12(4):368-372,5.基金项目
The authors would like to acknowledge the financial support from Pangang Group Pangzhihua Iron & Steel Research Institute (Grant No. 02-09-01). （Grant No. 02-09-01）
