钯原子修饰的金纳米颗粒乙醇氧化电催化剂(英文)  

Palladium Adatoms on Gold Nanoparticles as Electrocatalysts for Ethanol Electro-Oxidation in Alkaline Solutions

作　　者：陈慧梅 朱尚乾[2] 黄加乐 邵敏华[2] CHEN Hui-mei;ZHU Shang-qian;HUANG Jia-le;SHAO Min-hua(Department of Pharmaceutical Engineering,Zhejiang Pharmaceutical College,Ningbo 315100,Zhejiang, P.R.China;Department of Chemical and Biological Engineering,The Hong Kong University of Science and Technology,Clear Water Bay,Kowloon,Hong Kong 999077,P.R.China;Department of Chemical and Biochemical Engineering,College of Chemistry and Chemical Engineering, Xiamen University,Xiamen 361005,Fujian,P.R.China)

机构地区：[1]浙江医药高等专科学校制药工程学院,浙江宁波315100 [2]香港科技大学化学与生物工程系,中国香港999077 [3]厦门大学化学化工学院,化学工程与生物工程系,福建厦门361005

出　　处：《电化学》2018年第6期740-747,共8页Journal of Electrochemistry

基　　金：support from Research Grant Council(No.26206115) of the Hong Kong Special Administrative Region;Scientific Research Fund of Zhejiang Provincial Education Department(No.Y201840545).

摘　　要：钯催化剂对碱性溶液的乙醇电催化氧化反应表现较好的催化活性.本文通过简单的化学沉积法,将钯原子成功修饰到金纳米颗粒表面,制备的催化剂对乙醇电催化氧化反应表现出比钯更好的催化性能.研究发现,钯原子不均匀地覆盖在金核表面,部分金原子暴露在外层.制备的催化剂的峰电流密度是钯催化剂的4.6倍,起始电势低100 m V.该催化剂较好的催化性能可能归因于金核的电子效应和表面双功能电催化反应机制.Palladium(Pd) is a good catalyst for ethanol electro-oxidation in alkaline solutions.The activity of Pd is further improved in this study by modifying the gold(Au) nanoparticles with Pd adatoms using a simple spontaneous deposition process.The Pd overlayer on the Au core(Au@Pd) is un-uniform with some Au atoms exposed to the electrolyte.The activity of Au@Pd/C toward ethanol oxidation reaction(EOR) is much higher than that of Pd/C in an alkaline solution.The peak current density of Au@Pd/C is 4.6 times higher than that of Pd/C with a 100 mV lower onset potential.The enhanced activity may be due to the electronic effect from the Au core,and the bifunctional reaction mechanism.

关 键 词：乙醇氧化 核壳 电催化作用 燃料电池 表面原子 

分 类 号：O646[理学—物理化学] TM911.48[理学—化学]