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中文摘要：
以玻碳电极（GCE）为基体,采用恒电位法制备Pt-Au双金属催化剂.通过扫描电镜（SEM）,X射线能量色散谱（EDX）及电化学方法对催化剂样品进行了表征.SEM结果表明,Pt-Au双金属催化剂的形貌近似球状,表面粗糙.循环伏安法和计时电流法的测试结果表明,Au的加入有利于双金属催化剂上甲酸的电催化氧化,并提高了催化剂对甲酸氧化的抗毒化能力.而甲酸在催化剂上的氧化机理则通过电化学阻抗技术得到进一步说明.同时研究了双金属催化剂中Au的不同含量对甲酸氧化的影响,当Pt和Au物质的量比为1∶1.803时,Pt-Au/GC催化剂具有最佳的甲酸电催化氧化活性.
英文摘要：
Pt-Au bimetallic catalysts have been fabricated on glassy carbon electrode（GCE） substrate by the potentiostatic method.Catalyst samples have been characterized by scanning electron microscopy（SEM）,X-ray energy dispersive spectroscopy（EDX） and electrochemical methods.SEM results reveal that the samples are composed of near-spherical particles,and the surfaces of particles are rough.The results of cyclic voltammetry and chronoamperometry show that the addition of Au into bimetallic catalysts is benefi-cial to the electro-catalytic oxidation of formic acid and the anti-poisoning ability of platinum for formic oxidation is enhanced.Furthermore,the formic acid oxidation mechanism on these bimetallic catalysts has also been elucidated using an electrochemical impedance spectroscopy technique.Meanwhile,the different amount of Au in bimetallic catalysts has been studied for formic electrooxidation,and the results show that Pt1Au1.803 catalyst has the highest catalytic activity for formic acid electro-oxidation.
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