文献类型：期刊文献

英文题名：Fully Ordered and Trace Au-Doped Intermetallic PdFe Catalyst with Extra High Activity and Durability toward Oxygen Reduction Reaction

作者：Wu, Yanlin[1];He, Yang[1];Zhu, Xinxing[1];Wang, Jiannong[1]

机构：[1]East China Univ Sci & Technol, Nanocarbon Innovat Ctr, Sch Mech & Power Engn, 130 Meilong Rd, Shanghai 200237, Peoples R China

年份：2018

卷号：3

期号：23

起止页码：6399

外文期刊名：CHEMISTRYSELECT

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000435933100018)】；

基金：Financial support from National Natural Science Foundation of China (project #: 51271077, U1362104) is greatly acknowledged.

语种：英文

外文关键词：Au-doped; electrocatalysis; nanoparticle; oxygen reduction reaction; PdFe intermetallic

摘要：Developing Pt-free catalysts with high activity and durability is considered as an essential step for cost reduction and real commercialization of fuel cells. Previous Pt-free catalysts are either lack of activity and/or insufficient in durability. Here we report the first synthesis of a carbon-supported PdFe catalyst with a fully ordered intermetallic structure by controlling the atomic ratio of Pd and Fe and high-temperature annealing for structural ordering. This intermetallic catalyst is then doped with a trace amount of Au (atomic ratio of Au/Pd: 1/50) mainly in the surface region of the ordered lattice. Such an Au-doped intermetallic PdFe catalyst is finally demonstrated to possess a comparable catalytic activity and much better durability for oxygen reduction reaction than the commercial catalyst of Pt/C. For example, the half-wave potential of the Au-PdFe catalyst decreases at a rate 9 times slower than that of Pt/C catalyst after potential cycling under harsh electrochemical conditions. The excellent activity and durability of this new catalyst is attributed to the ordered structure of PdFe particles and the protective effect of the surface Au doping. This study provides a new strategy to developing Pt-free catalysts, lowering the production cost, and accelerating the practical application of fuel cells.