采用溶胶-凝胶法制备RuO_2-Co_3O_4-CeO_2(Ru-Co-Ce)复合氧化物电极,利用SEM、XRD对电极表面形貌及物相结构进行了表征,并通过循环伏安及阳极极化曲线等手段对1.0mol/L KOH溶液中电极的析氧反应(OER)活性及其动力学进行了系统研究.结果表明,稀土CeO_2可细化RuO_2晶相,提高电极活性表面积,其中40%(摩尔分数)CeO_2复合氧化物电极具有最大的伏安电荷86.23mC/cm~2,在过电位η=0.60V(Ag/AgCl)时,其反应表观活化能可低至22.76kJ/mol,具有最佳的析氧活性.电极在低过电位及高过电位区域Tafel斜率分别约为40、120mV,电极对OH-的反应级数均为1.0.
Ti-supported RuO_2-Co_3O_4-CeO_2(Ru-Co-Ce)electrodes were prepared by sol-gel process.The surface morphology and phase structure of the coating anode were characterized by SEM and XRD.Electrocatalytic activity and oxygen evolution reaction (OER) kinetics on these electrodes in 1.0mol/L KOH solution were studied recording cyclic voltammetry and polarisation curve.The results showed that the appropriate content of CeO_2 could reduced the grain size and increased active surface area.Mixed oxide electrodes with 40mol% CeO_2 had the greatest voltammetric charge,86.23mC/cm~2,and the standard electrochemical energy of activation for OER at 0.60V was 22.76kJ/mol.Catalytic performance was the best.Tafel slopes at low and high overpotential were 40 and 120mV,respectively.The order of reaction order with respect to [OH-] are both 1.0.The oxygen evolution reaction kinetics equation on these electrodes were presented,which could account for the values of the experimental results.
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