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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.
The Ti-based manganese dioxide electrode containing SbOx + SnO2 interlayer was prepared by thermal decomposition method. The accelerated electrolysis of manganese dioxide anode with and without SbOx + SnO2 interlayer was carried out in 0.5 mol·L-1H2SO4 solution. The polarization reaction and the cyclic voltammetry were used to measure the chlorine evolution reaction of the electrode.The cyclic voltammetry and electrochemical impedance spectroscopy were used to analyze the internal structure and surface change of the electrode during electrolysis.The results showed that the anode passivation failure The main reason is the formation and thickening of the insulating TiO2 layer.The introduction of the intermediate layer can reduce the electrical resistance between the titanium substrate and the active coating and significantly delay the increase of the contact resistance during electrolysis so as to significantly improve the lifetime.