多元中间过渡层钛基氧化锰电极的寿命及电化学性能

Lifetime and electrochemical properties of Ti/MnO_2 electrodes with multivariant intermediate layers

采用热分解法制备了不同中间层的钛基氧化锰电极,利用SEM、XPS和XRD方法对电极进行了表征,应用加速寿命试验方法测试了电极在60℃、1.0mol/L H2SO4溶液中的预期使用寿命,同时测定了酸性溶液中该类电极的动力学参数(a、b、i0),运用双位垒模型讨论了电极的电化学性能。结果表明,具有RuO2+SnO2+MnO2+Sb2O4固溶体中间层的钛基氧化锰电极在高电流密度下(4A/cm2)的寿命可高达58h,电化学动力学表明该电极在酸性溶液中的析氧活化能较低,a值较小,i0值较大,是酸性溶液中较好的析氧电极材料。

Acid-proof Ti based-MnOz anodes with multivariant intermediate layers were prepared by thermal decomposition method and characterized by SEM, XPS and XRD, the lifetime of anodes was determined in 1.0 mol/L H2SO4 solution at 60℃ by fast life method, the anodic kinetic parameters （a, b, io） are examined, and the electrochemical properties of the electrodes was discussed with dual barrier model. The results show that the lifetime of Ti/RuO2 ＋SnO2 ＋ MnO2 ＋Sb2O4/MnO2 at 4A/cm2 can be as long as 58 h, electrochemical kinetics indicates that the active energy for oxygen evolution is lower at the anode, a is smaller and io is larger, so they are better anodes materials in acid solution.