摘要
采用极化曲线和循环伏安等电化学方法,对不同温度下IrO2电极在MnSO4镀液与硫酸溶液中的电化学行为进行对比研究,并以镀液中极化曲线上不同电流密度值进行阳极电沉积,测量镀速大小.研究结果表明:IrO2电极在镀液中同时发生阳极电沉积反应和析氧副反应,阳极电沉积反应对析氧反应具有明显的抑制作用;MnO2的阳极电沉积过程较复杂,存在Mn3+中间产物,既有Mn3+→Mn4+的电沉积过程,也有Mn3+的水解及水解产物的脱附的过程,水解反应的存在严重降低了MnO2的阳极电沉积的电流效率;MnO2的阳极电沉积存在一定的电位区间,在此区间,镀速存在最大值.
The electrochemical behavior of IrO2 electrodes in a MnSO4 plating solution and in a H2SO4 solution at different temperatures was investigated by polarity curve and cyclic voltammetry methods.The anodic electrode deposition was carried out at different current densities according to the polarity curve obtained in the bath and the deposition velocity was measured.The results show that the anodic electrode deposition reactions and the O2 production reaction on the IrO2 electrode in the bath occur simultaneously and the former reaction obviously restrains O2 production.The process of MnO2 electrodeposition onto IrO2 is complicated and a Mn3＋ intermediate product is produced,which can be oxidized to Mn4＋ during the electrode deposition.Mn3＋ is hydrolyzed at the same time as the oxidation and its hydrolysate desorbs,which causes an obvious reduction in current efficiency for the MnO2 anodic electrodeposition.A potential range exists for the MnO2 anodic electrode deposition and we also found a maximum value for the deposition velocity within the potential range.
出处
《物理化学学报》
SCIE
CAS
CSCD
北大核心
2011年第2期461-467,共7页
Acta Physico-Chimica Sinica
基金
国家高技术研究发展计划(863)项目(2007AA05Z103)资助~~
关键词
二氧化锰
阳极电沉积
电化学行为
电流效率
Manganese dioxide
Anode electrode position
Electrochemical behavior
Current efficiency
