Positioning the reference electrode in proton exchange membrane fuel cells: calculations of primary and secondary current distribution
Positioning the reference electrode in proton exchange membrane fuel cells: calculations of primary and secondary current distribution
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DOI：
10.1016/j.electacta.2003.10.004
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发表时间：
2004-03
影响因子：
6.6
通讯作者：
Zhenyu Liu;J. Wainright;Weiwei Huang;R. Savinell
中科院分区：
文献类型：
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作者：
Zhenyu Liu;J. Wainright;Weiwei Huang;R. Savinell
一次和二次电流分布研究表明，质子交换膜(PEM)燃料电池中薄电解液的几何形状与被测电极极化有直接关系，因此参考电极的位置和欧姆补偿是至关重要的。电极上不同的动力学过电位也会影响电势分布，从而影响测量精度。对于具有不同动能过电位和电极不对准的燃料电池系统，测量误差可能很大。分析了氢燃料电池和直接甲醇燃料电池(DMFC)在无传质影响的电流密度范围内的测量误差。通过使用两个参比电极，直接甲醇燃料电池的阳极和阴极测量以及氢/空气燃料电池的阴极测量的测量误差都可以大大降低。
The primary and secondary current distribution study indicates the geometry of a thin electrolyte in a proton exchange membrane (PEM) fuel cell has a direct relation to the measured electrode polarization, thus making the positioning of the reference electrode and ohmic compensation critical. The different kinetic overpotentials on the electrodes can also affect the potential distribution and therefore affect the measurement accuracy. The measurement error can be significant for the fuel cell system with different kinetic overpotentials and with electrode misalignment. The measurement error for both hydrogen and direct methanol fuel cells (DMFC) has been analyzed over the current density region with no mass transfer effects. By using two reference electrodes, the measurement error can be substantially decreased for both anode and cathode measurement in a direct methanol fuel cell, and for the cathode measurement in a hydrogen/air fuel cell.