Measurement of Physical Properties of Membrane and Analysis of Current Density Distribution at a Polymer Electrolyte Fuel Cell
Measurement of Physical Properties of Membrane and Analysis of Current Density Distribution at a Polymer Electrolyte Fuel Cell
复制标题
聚合物电解质燃料电池膜物理性能的测量和电流密度分布分析
DOI：
10.1541/ieejpes.125.530
复制
发表时间：
2005
影响因子：
--
通讯作者：
K. Onda
中科院分区：
文献类型：
--
作者：
H. Koori;T. Taniuchi;T. Araki;K. Onda
为了正确掌握PEFC发电性能，需要了解水管理因素，如水蒸气通过膜的透过率和电渗透系数，以及功率损失因素，如有源过电位和电阻过电位。在本研究中，我们测量了这些因素，并通过我们的二维模拟代码来分析我们的PEFC发电测试的实验结果。它同时考虑了质量、电荷和能量守恒方程，以及PEFC的等效电路，以给出氢/氧浓度、电流密度和气体/电池组分温度的数值分布。不同工作条件下电流密度的数值分布与分段电极的实测分布吻合较好，该分段电极具有供氢/供氧槽，并在我们的测试单元中进行了电绝缘。气相色谱法测定的氢/氧浓度沿供气槽的变化也给出了实验电流分布，与分段电极的结果几乎一致。本文还从计算结果的物理意义出发，考虑到规范中未考虑的因素，讨论了修正实测和计算电流密度分布之间微小差异的因素。
In order to grasp properly PEFC power generation performances, it is necessary to know factors for water management such as transmissivity and electro-osmotic coefficient of water vapor through the membrane, and factors for power loss such as active and resistive overpotentials. In this study we have measured these factors to analyze our experimental results of PEFC power generation tests by our two-dimensional simulation code. It considers simultaneously the mass, charge and energy conservation equations, and the equivalent electric-circuit for PEFC to give numerical distributions of hydrogen/oxygen concentrations, current density, and gas/cell-component temperatures. The numerical distributions of current density under various operating conditions agreed well with the measured distributions by segmented electrodes, which had grooves for hydrogen/oxygen supply and were mold in our test cell being electrically insulated. Hydrogen/oxygen concentration changes measured by gas chromatography along the gas supply grooves gave also the experimental current distributions, which coincided almost with those by the segmented electrodes. Factors to correct the small difference between the measured and the calculated current density distribution are also discussed from the stand point of the physical meaning of the calculated results considering factors which are not taken into account in our code.