文献类型：期刊文献

英文题名：Remarkable durability of Pt-Ir alloy catalysts supported on graphitic carbon nanocages

作者：Zeng, Min[1];Wang, Xiao Xia[1];Tan, Zhe Hua[1];Huang, Xin Xin[1];Wang, Jian Nong[1]

机构：[1]E China Univ Sci & Technol, Nanox Res Ctr, Sch Mech & Power Engn, Shanghai 200237, Peoples R China

年份：2014

卷号：264

起止页码：272

外文期刊名：JOURNAL OF POWER SOURCES

收录：;EI(收录号：20142117737311);WOS:【SCI-EXPANDED(收录号:WOS:000337861800035)】；

基金：Financial supports from National Natural Science Foundation of China (project #: 51271077 and U1362104) and Shanghai Nanoscience and Nanotechnology Promotion Center (project #: 12nm0503300) are greatly acknowledged.

语种：英文

外文关键词：Pt catalyst; Pt-Ir alloy catalyst; Carbon nanocages; Durability; Proton exchange membrane fuel cell

摘要：Low durability is the major challenge hindering the large-scale implementation of proton exchange membrane fuel cell (PEMFC) technology. To improve the electrochemical activity and durability of conventional Pt catalyst used in PEMFCs, we prepare Pt-Ir alloy catalysts supported on homemade graphitic carbon nanocages (CNCs). Results from cyclic voltammetry (CV) and linear sweep voltammetry (LSV) show that the alloy catalyst with an atomic Pt/Ir ratio of 1:1 supported on CNCs with a high degree of graphitization exhibits an excellent electrocatalytic activity. Furthermore, this alloy catalyst shows a drastic improvement in durability and stability over the unalloyed Pt catalyst supported on the same CNCs and the catalyst from a commercial source (Johnson Matthey Co.). It is found that the concurrent uses of well-graphitized CNCs as the support material and Ir as the alloying element are critical for the observed improvement. Such a Pt-Ir alloy catalyst provides a new replacement for the conventional Pt catalyst with not only a drastic improvement in durability but also a reduction in Pt usage by 50% as well. (C) 2014 Elsevier B.V. All rights reserved.