考虑氯化钠中毒影响的PEMFC电化学性能仿真

氯化钠中毒对质子交换膜燃料电池(Proton Exchange Membrane Fuel Cell ,PEMFC)电化学性能有重要影响。通过量纲分析方法修正电化学模型并利用COMSOL Multiphysics平台量化分析氯化钠浓度对质子交换膜燃料电池性能影响，最后验证了修正电化学模型的准确性。结果表明：随着阴极空气中氯化钠浓度增大，电池电化学性能降低。低电流密度时，氯化钠浓度变化对质子交换膜燃料电池极化曲线、功率密度曲线几乎无影响；中、高电流密度时，电池输出电压、最大输出功率随氯化钠浓度增加而降低。当氯化钠浓度达到 8×10^-5mg·cm^-3，膜最大、最小电流密度分别下降30.83%、25.23%，最大输出功率密度下降50.00%。 关键词：质子交换膜燃料电池；氯化钠中毒；电池性能；数值仿真

Simulation on the Electrochemical Performances of Proton Exchange Membrane Fuel Cell with Sodium Chloride Poisoning

Sodium chloride poisoning has an important effect on the electrochemical performance of proton exchange membrane fuel cell (PEMFC). In this contribution, the electrochemical model was modified by dimensional analysis and the influence of NaCl concentration on the performance of PEMFC was quantitatively analyzed by COMSOL Multiphysics, and the accuracy of the modified electrochemical model was verified. The results show that as the concentration of NaCl in cathode increases, the performance decreases. At low current density, the variation of NaCl concentration has almost no effect on the polarization curve and power density curve of PEMFC. While at medium and high current densities, the voltage and the maximum output power decrease with the increase of the concentration of NaCl. When the concentration of NaCl reaches 8*10-5 mg·cm-3, the maximum and minimum current densities of the PEM respectively decrease by 30.83% and 25.23%, and the maximum output power density decreases by 50.00%.