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Ru-Co-Ce复合氧化物阳极在碱性溶液中析氧性能研究

Electrocatalytic activity of titanium based Ru-Co-Ce mixed oxide electrodes for oxygen evolution
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摘要 采用溶胶-凝胶法制备RuO2-Co3O4-CeO2(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CeO2可细化RuO2晶相,提高电极活性表面积,其中40%(摩尔分数)CeO2复合氧化物电极具有最大的伏安电荷86.23mC/cm2,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-Co3O4-CeO2(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 CeO2 could reduced the grain size and increased active surface area.Mixed oxide electrodes with 40mol% CeO2 had the greatest voltammetric charge,86.23mC/cm2,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 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.
出处 《功能材料》 EI CAS CSCD 北大核心 2010年第3期500-504,共5页 Journal of Functional Materials
基金 国家自然科学基金资助项目(50476091) 黑龙江省自然科学基金资助项目(B200401)
关键词 RUO2 CO3O4 CEO2 阳极 析氧 RuO_2 Ce electrocatalytic activity oxygen evolution mixed oxide
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