电极
膜电极组件
Nafion公司
材料科学
聚四氟乙烯
膜
循环伏安法
复合材料
极化(电化学)
介电谱
相对湿度
化学工程
分析化学(期刊)
电化学
化学
电解质
色谱法
工程类
物理化学
物理
热力学
生物化学
作者
Ting-Chu Jao,Guo-Bin Jung,Pei‐Hung Chi,Shih-Tsung Ke,S. H. Chan
标识
DOI:10.1016/j.jpowsour.2010.09.068
摘要
The main purpose of this study is to investigate the accelerated degradation of the PTFE/Nafion membrane electrode assembly through open circuit voltage and relative humidity cycling. The state of a PTFE/Nafion membrane electrode assembly is evaluated in a fuel cell by monitoring the polarization curve, AC impedance, cyclic voltammetry, and linear sweep voltammetry data over time. The experimental results are then fitted to equations of an equivalent circuit. The results of the first 160 experimental cycles show that catalyst degradation is the main cause for the decay of the membrane electrode assembly. During the 160–520th cycles, the membrane electrode assembly experiences creep deformation, which is due to relative humidity cycling. During the 640–840th cycles, the degradation causes a gradual transition from minor to major membrane cracking; after which the combustion reaction dramatically accelerates membrane electrode assembly degradation.
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