CeO_2/Pt复合电极及其电催化特性  

CeO_2/Pt Composite Electrodes and Their Catalytic Performance

作　　者：符颖[1,2] 魏子栋[1,2,3] 冯永超[2] 马兴立[2] 廖明佳[2] 廖超[2] 张捷[3] 张环[3] 

机构地区：[1]重庆大学输配电装备及系统安全与新技术国家重点实验室,重庆400044 [2]重庆大学化学化工学院,重庆400044 [3]重庆大学材料科学与工程学院,重庆400044

出　　处：《电化学》2008年第4期407-410,共4页Journal of Electrochemistry

基　　金：国家自然科学基金(20676156);教育部重大科学研究计划(307021);重庆大学研究生科技创新基金(200701Y1A0260212);重庆市科技攻关项目(CSTC2007AB6012)资助

摘　　要：应用恒电位沉积(psd)和电位脉冲沉积(ppd)法在Pt基底制备CeO2/Pt复合电极,用能量色散X射线光谱(EDX)和X射线衍射(XRD)检测CeO2纳米粒子的成分和结构,场发射扫描电子显微镜(FESEM)观察样品形貌.结果表明:CeO2颗粒细小、致密.在KOH溶液中,CeO2/Pt对甲醇氧化和氧还原有电催化作用;若在稀硫酸中溶除CeO2/Pt电极(ppd)的部分CeO2,则电极的电催化作用进一步增强.In this paper, the cerium oxide （ CeO2） nanoparticles were electrochemically deposited on a Pt electrode by potentiostatic deposition （psd） and potential pulse deposition （ppd） to form CeO2/Pt composite electrodes, CeO2/Pt （psd） and CeO2/Pt （ppd）. The properties of the CeO2 were characterized by field emission scanning electron microscope （FESEM） and X-ray diffraction （XRD）. The results showed that the CeO2 nanoparticles prepared by psd and ppd were homogeneous and dense. The methanol oxidation reaction （MOR） and oxygen reduction reaction （ORR） on the Pt electrode were enhanced with the introduction of CeO2 into Pt. In addition, the catalytic capability of the CeO2/Pt electrode can be further improved after dissolution of part of CeO2 on the composite electrode in H2SO4. The enhanced catalysis of CeO2/Pt electrode was obsarved duo to the oxygen storage capability of CeO2 which helps to oxidize off CO in the MOR and to supply more oxygen to the electrode in the ORR

关 键 词：二氧化铈 电沉积 甲醇氧化 氧还原 铂 

分 类 号：O643.361[理学—物理化学]