摘要
采用热分解方法制备了含SbOx+SnO2中间层的钛基二氧化锰电极.在0.5mol·L-1H2SO4溶液中对添加和没有添加SbOx+SnO2中间层的二氧化锰阳极进行了加速电解实验.采用极化曲线和循环伏安曲线测量电极的析氯反应.用循环伏安曲线和电化学阻抗谱来分析电极电解过程中内部结构和表面的变化.结果表明,二氧化锰阳极钝化失效的主要原因是绝缘的TiO2层的生成和变厚.引入中间层可以降低钛基体和活性涂层间的电阻,并且在电解过程中,可以显著延缓接触电阻的升高,从而可以显著提高其寿命.
SbOx＋SnO2 were prepared by thermal decomposition as intermediate layer of Ti based MnO2 anode. Service lives of the anodes with or without SbOx ＋SnO2 intermediate layer in 0.5 mol ·L^-1 H2SO4 solution were investigated by using accelerated electrolysis. Polarization curves and cyclic voltammetric curves （CVs） were utilized to analyze C12 evolution reaction （CER） of the oxide electrodes. Cyclic voltammetric curves and electrochemical impedance spectroscopy （EIS） were utilized with the aim of obtaining detailed information related to the changes of the inner structure during the electrolysis. The results indicated that the main reason for the deactivation of MnO2 anodes was the passivation derived from the increase of the thickness of the insulating TiO2 layer. With the introduction of intermediate layer, the resistance between Ti base and active coating was lowered and the increase of resistance during the electrolysis was postponed dramatically, so the service lives were improved remarkably.
出处
《物理化学学报》
SCIE
CAS
CSCD
北大核心
2007年第10期1553-1559,共7页
Acta Physico-Chimica Sinica
基金
北京教委产学研合作(Cxy100080406)资助项目
