期刊
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
卷 158, 期 8, 页码 B910-B918出版社
ELECTROCHEMICAL SOC INC
DOI: 10.1149/1.3595748
关键词
-
资金
- Office of Energy Efficiency and Renewable Energy at the US Department of Energy [DE-FG36-07GO17007]
Nanostructured thin film catalysts (NSTF) with widely varying compositions of PtxMy and PtxMyNz (M, N = Ni, Co, Zr, Hf, Fe, Mn) have been evaluated for 0 <= x, y, z < 1. The catalysts' activity for oxygen reduction (ORR) was measured in 50 cm(2) fuel cell membrane electrode assemblies. Pt1-xNix was found to be unique in showing an extraordinarily sharp peak in ORR activity as a function of the as-made composition around x = 0.69 +/- 0.02 determined gravimetrically. This composition gave a corresponding fcc lattice parameter of 3.71 Angstroms and a grain size of 7.5 nm. Both surface area and specific activity increases contribute to the increased mass activity of the resultant dealloyed films. The ORR mass activity of the Pt3Ni7 is 60% higher than for the NSTF standard Pt68Co29Mn3 alloy. Rotating disk electrode measurements of a Pt1-xNix series on NSTF coated glassy carbon disks show a similar large and sharp peak in activity. In contrast, PtCo shows a diminished but still sharply peaked mass activity in 50 cm(2) tests near x = 0.62 by electron microprobe over the 0 < x < 0.7 range examined. (C) 2011 The Electrochemical Society. [DOI: 10.1149/1.3595748] All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据