为了改进Ti/RuO_2(0.5)-Co_3O_4(0.5)电极的析氧催化性能,采用热分解法在400℃下制备了稀土Ce改性Ti/RuO_2(0.5)-Co_3_O_4(0.5)氧化物电极,对稀土Ce掺杂量进行了优化.通过开路电压、循环伏安及极化曲线研究了电极在1.0 mol/L KOH溶液中的析氧催化活性.结果表明:稀土Ce掺杂可明显提高电极伏安电荷量、内外活性表面积及电极表面粗糙度,同时能降低析氧反应表观活化能;当其掺杂量为10:4时电极性能最佳,伏安电荷量和表面粗糙度分别高达806 mC/cm~2和3 047.83,析氧反应表观活化能低至15.74 kJ/mol.这主要是稀土Ce具有孔引发剂的作用,可提高活性氧化物晶粒的分散性,使电极活性表面积增加,改善了析氧催化活性.
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