摘要
为了改进Ti/RuO2(0.5)-Co3O4(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/RuO2(0.5)-Co3O4(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1.0mol/LKOH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806mC/cm2和3047.83,析氧反应表观活化能低至15.74kJ/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。
Ti-supported Ce-doped RuO,(0.5)-Co3O4(0.5) electrodes were prepared by using thermaldecomposition at 400℃,where the dosage of CeO2 was optimizedfor improving the electrocatalytic performance of the electrodes.The oxygen evolution electrocatalytic activity of the resultingCe-doped electrodes in 1.0 mol/L KOH solution was studied byrecording open-potential,cyclic voltammogram and polarizationcurves.Results show that doping of CeO2 contributes to greatlyimproved electrocatalytic activity of the electrodes.Typically,theelectrodes doped with CeO2 at a ratio of 10:4 showed the bestelectrocatalytic performance,with the greatest voltammetriccharge of 806 mC.cm-2,the maximum surface roughness of3047.83 and the lowest apparent activation energy of 15.74kJ/mol.Rare-earth Ce could act as a hole initiator and increasethe dispersion of grains of active oxide,leading to increased ac-tive surface area of the electrodes and improved electrocatalyticactivity for oxygen evolution.
出处
《材料保护》
CAS
CSCD
北大核心
2010年第2期4-8,共5页
Materials Protection
基金
国家自然科学基金(50476091)
黑龙江省自然科学基金(B200401)资助
关键词
电极涂层
稀土铈
二氧化钌
析氧
电催化活性
electrode coating
rare earth Ce
RuO_2
oxygen evo-lution
electrocatalytic activity
