渡线
线性扫描伏安法
质子交换膜燃料电池
电流(流体)
氢
度量(数据仓库)
校准
燃料电池
化学
分析化学(期刊)
材料科学
循环伏安法
热力学
电化学
计算机科学
数学
物理
电极
工程类
统计
化学工程
色谱法
有机化学
人工智能
物理化学
数据库
作者
Pucheng Pei,Ziyao Wu,Yuehua Li,Xiaohan Jia,Dongfang Chen,Shangwei Huang
标识
DOI:10.1016/j.apenergy.2018.02.002
摘要
Hydrogen crossover current has a great influence on the performance and durability of proton exchange membrane (PEM) fuel cells. The common measuring method is linear sweep voltammetry (LSV). But some usual approximations, such as ignoring the influence of scan rates or short-circuit resistances, can lead to greater measurement deviations. Therefore, in this study to accurately measure hydrogen crossover current, LSV is improved by building a novel charging model based on fitted zero scan rate curves and on taking effects of short circuit into consideration. On the basis of this new model, galvanostatic charging method is improved by taking short circuit of PEMs into consideration and a mass spectrometry assisted with hydrogen pump is proposed with no need of calibration with standard gas. Hydrogen crossover current and short-circuit resistance of a 34 cm2 single cell are measured by three improved methods, which are then compared with methods previously available. It is found that hydrogen crossover currents are reduced and more accurate than those obtained by previous methods, and values obtained by different improved methods are highly consistent with each other. So the proposed charging model is valid and can be used to optimize other electrochemical measurements of fuel cells.
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