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清华大学学报(自然科学版)  2016, Vol. 56 Issue (6): 587-591    DOI: 10.16511/j.cnki.qhdxxb.2016.22.016
  汽车工程 本期目录 | 过刊浏览 | 高级检索 |
质子交换膜燃料电池氢气渗透电流及电子电阻检测方法
徐华池, 裴普成, 吴子尧
清华大学 汽车安全与节能国家重点实验室, 北京 100084
Hydrogen crossover current and electronic resistance detection in a PEM fuel cell
XU Huachi, PEI Pucheng, WU Ziyao
State Key Laboratory of Automotive Safety and Energy, Tsinghua University, Beijing 100084, China
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摘要 该文根据燃料电池在线性电位扫描下的响应特征, 建立了等效电路模型, 以区分电池内部的电化学过程, 包括氢脱附、双电层电容充电、电子内部短路以及氢气渗透。基于该模型, 改善了线性电位扫描的分析方法, 消除了扫描速率对结果的影响, 并解析得到了氢气渗透电流和电子电阻。根据模型假设, 详细阐述了恒电流扫描测量氢气渗透电流和电子电阻的分析方法。在一个34 cm2的单体电池上应用两种方法进行测量对比, 结果表明: 线性电位扫描得到的氢气渗透电流为1.19 mA·cm-2, 电子电阻为479 Ω·cm2; 恒电流方法得到的氢气渗透电流为1.25 mA·cm-2, 电子电阻为413 Ω·cm2。该模型可用于分析燃料电池各种电化学测量过程, 线性电位扫描方法和恒电流方法为燃料电池不同场合的测量和分析提供了参考。
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徐华池
裴普成
吴子尧
关键词 质子交换膜燃料电池氢气渗透电流电子电阻线性电位扫描恒电流方法    
Abstract:The response characteristics of linear sweep voltammetry (LSV) were used to develop an equivalent circuit model of a proton exchange membrane (PEM) fuel cell to distinguish the various electrochemical processes, including hydrogen desorption on the platinum, charging of the double-layer capacitance, electron internal short circuits and hydrogen crossover. This model eliminated the effect of the scan rate on the LSV results so that the hydrogen crossover current and membrane electronic resistance could be measured. A galvanostatic method was also used to measure the hydrogen crossover current and the electronic resistance. Measurements on a single cell with an active area of 34 cm2 with the LSV method show that the hydrogen crossover current is 1.19 mA·cm-2 and the electronic resistance is 479 Ω·cm2 while the galvanostatic measurements give the hydrogen crossover current of 1.25 mA·cm-2 and the electronic resistance of 413 Ω·cm2. This model can be used to analyze various electrochemical measurements in PEM fuel cells with the two methods giving complementary measurements for various PEM fuel cell processes.
Key wordsproton exchange membrane (PEM) fuel cell    hydrogen crossover current    electronic resistance    linear sweep voltammetry (LSV)    galvanostatic method
收稿日期: 2015-07-31      出版日期: 2016-07-01
ZTFLH:  TK91  
通讯作者: 裴普成, 教授, E-mail: pchpei@tsinghua.edu.cn     E-mail: pchpei@tsinghua.edu.cn
引用本文:   
徐华池, 裴普成, 吴子尧. 质子交换膜燃料电池氢气渗透电流及电子电阻检测方法[J]. 清华大学学报(自然科学版), 2016, 56(6): 587-591.
XU Huachi, PEI Pucheng, WU Ziyao. Hydrogen crossover current and electronic resistance detection in a PEM fuel cell. Journal of Tsinghua University(Science and Technology), 2016, 56(6): 587-591.
链接本文:  
http://jst.tsinghuajournals.com/CN/10.16511/j.cnki.qhdxxb.2016.22.016  或          http://jst.tsinghuajournals.com/CN/Y2016/V56/I6/587
  图1 不同扫描速率下的线性电位扫描曲线
  图2 燃料电池在充电过程中发生的4种
电化学过程示意图
  图3 燃料电池在充电过程中的等效电路模型
  图4 恒流充电过程中燃料电池的电压曲线
  图5 不同电压区间[Vs,VT]的内部电流密度中值和电压中值
  图6 氢气渗透电流密度和电子电阻的解析结果
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