电化学合成Pt-Au复合催化剂及其对甲醇的电催化氧化  

Electrochemical Synthesis of Pt-Au Composite Catalysts and Their Electrocatalytic Activity for Methanol Oxidation

作　　者：张红梅[1] 周卫强[1,2] 杜玉扣[1] 杨平[1] 徐景坤[2] 

机构地区：[1]苏州大学化学化工学院,苏州215123 [2]江西科技师范学院江西省有机功能分子重点实验室,南昌330013

出　　处：《化学学报》2010年第24期2529-2534,共6页Acta Chimica Sinica

基　　金：国家自然科学基金(No.20933007);江苏省教委(No.08KJD150020)资助项目

摘　　要：在ITO导电玻璃上,采用循环伏安法制备Pt-Au复合催化剂.通过扫描电镜(SEM),X射线能量色散谱(EDX),X射线衍射(XRD)及其电化学方法对催化剂样品进行了表征.SEM结果表明,Pt-Au复合催化剂的形貌近似球状粒子.循环伏安法和计时电流法的测试结果表明,复合催化剂中Au的加入有利于甲醇的电催化氧化,并提高了Pt对甲醇氧化的抗毒化能力.同时研究了复合催化剂中Au的不同含量对甲醇氧化的影响,结果表明,当Pt和Au物质的量比为1.07:1时,Pt-Au/ITO催化剂具有最佳的甲醇电催化氧化活性.Pt-Au composite catalysts are prepared on an indium tin oxide（ITO） glass substrate by cyclic voltammetry.Catalyst samples are characterized by scanning electron microscopy（SEM）,X-ray energy dispersive spectroscopy（EDX）,X-ray diffraction（XRD） and electrochemical methods.SEM results reveal that the samples are composed of near-spherical microparticles.Cyclic voltammetry and chronoamperometry results show that the addition of Au into composite catalysts is beneficial to the electro-catalytic oxidation of methanol and the anti-poisoning ability of platinum for methanol oxidation is enhanced.At the same time,the different content of Au in composite catalysts has been studied for methanol electro-oxidation,the results show that Pt-Au/ITO catalyst has the best catalytic activity for methanol electro-oxidation when the molar ratio of Pt to Au is 1.07：1.

关 键 词：甲醇氧化 复合催化剂 电沉积 电催化 

分 类 号：TQ223.121[化学工程—有机化工]