摘要
用气体电量计法分解极化曲线研究了温度对PbO2、Pt电极上Ce4+阳极形成过程的影响，得到了两电极上Ce4+和O2的表观活化能．在Pt电极上Ce4+的活化能大于O2的活化能；温度升高时使Ce4+的电流效率升高．但PbO2电极上Ce4+的活化能小于O2的活化能，温度升高时Ce4+的电流效率降低．研究了不同Ce3+浓度对Ti／Pt基MnO2电极上Ce4+阳极形成过程的影响，得出了该反应对［Ce3+］的表观反应级数为0．5左右；讨论了可能的机理．对比研究了不同电极材料对Ce4+的生成和O2的析出的催化性能．结果表明，石墨电极对Ce3+的阳极氧化有较好的催化活性；MnO2的催化性能很差；当MnO2与PbO2混合时，由于对O2有较大的催化作用，使Ce4+的电流效率下降．
he kinetic data related respecting to Ce4+ anodic formation and O2 anodic evolution atPbO2 and Pt electrode in 0. 6 mol· L-1 +0. 05 mol. L-1 Ce2(SO4)3 with different temperature were obtained by the method of resolving the steady state polarization curve. Highercurrent efficiency was obtained on Pt anode when increasing temperature than on PbO2 anode. The machanism of oxidation reaction was gained from the polarization curves of different concentration of Ce (Ⅲ ) on Ti/Pt/MnO2 anode. We concluded the kinetic equations:which can explain the experimental phenomena. The catalytic effects of some anodes werecompared. The results show that graphite carbon anode has a better catalytic activity tothe anodic oxidation of Ce(Ⅲ ) ion and MnO2 has a bad catalytic activity and the current efficiency is low when MnO2 and PbO2 were mixed.
出处
《南开大学学报（自然科学版）》
CAS
CSCD
北大核心
1997年第2期81-87,共7页
Acta Scientiarum Naturalium Universitatis Nankaiensis
基金
国家自然科学基金
关键词
电化学氧化
电极材料
温度
铈
阳极氧化
anodic formation of Ce^(4+)ion
indirect electrochemical oxidation
Pt electrode
PbO_2 electrode
MnO_2 electrode
