Facile design of Au@Pt core-shell nanostructures： Formation of Pt submonolayers with tunable coverage and their applications in electrocatalysis  

作　　者：Fulin Zheng Wing-Tak Wong Ka-Fu Yung 

机构地区：[1]Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Hung Hom, Hong Kong SAR, China

出　　处：《Nano Research》2014年第3期410-417,共8页纳米研究（英文版）

摘　　要：A facile design of Pt nanostructures from submonolayer to monolayer has been realized by ion adsorption-in situ electrochemical reduction on Au nanoparticles supported on multiwall carbon nanotubes （CNTs）. The as prepared Au@Pt/CNTs catalysts display coverage-specific electrocatalysis. Au@Pt/CNTs with low Pt coverage is inactive towards methanol oxidation whereas it oxidizes formic acid effectively through a direct pathway with mass specific activity 90 times that of a commercial Pt/C catalyst. Due to its inertness to methanol, it shows high performance in the oxygen reduction reaction （ORR） with high methanol tolerance. In contrast, simply increasing the Pt coverage to above 40% switches the formic acid oxidation process to both direct and indirect catalytic pathways, and also results in high methanol oxidation activity.

关 键 词：ELECTROCATALYSIS PLATINUM SUBMONOLAYER fuel cell 

分 类 号：O643.36[理学—物理化学] TB383[理学—化学]