离聚物
催化作用
合金
材料科学
Nafion公司
质子交换膜燃料电池
钴
铂金
化学工程
X射线吸收光谱法
复合材料
化学
吸收光谱法
冶金
电极
电化学
有机化学
物理化学
共聚物
工程类
物理
聚合物
量子力学
作者
Deborah J. Myers,A. Jeremy Kropf,Evan C. Wegener,Hemma Mistry,Nancy N. Kariuki,Jae Hyung Park
出处
期刊:Journal of The Electrochemical Society
[The Electrochemical Society]
日期:2021-04-01
卷期号:168 (4): 044510-044510
被引量:17
标识
DOI:10.1149/1945-7111/abf4ab
摘要
In this paper we report on studies of the effects of catalyst-ionomer ink composition: ionomer equivalent weight (EW), ink solvent, and ink mixing on a commercial PtCo alloy PEMFC cathode catalyst. X-ray absorption spectroscopy (XAS) and wide-angle X-ray scattering (WAXS) are utilized to determine catalyst atomic structure, catalyst crystallite composition, and extent of loss of Co into the ionomer-solvent phase. Three different n-propanol to water weight ratios (7:3, 5:5, and 3:7) and two different ionomers (3 M 800 EW and Nafion 1000 EW) were studied. Cobalt loss from the PtCo particles was found to increase with increasing water content in the inks and to be more extensive for the 800 EW ionomer inks, causing loss of contraction of the PtCo lattice and formation of a Pt shell-PtCo alloy core intraparticle structure.
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