A steady-state, one dimensional computational model is developed to predict the effect of foreign cation contamination in polymer electrolyte fuel cells (PEFCs). The model solves the coupled transport phenomena of cations, oxygen, and water. Foreign cation (i.e. Na~+) contamination in the air stream found to significantly decrease the performance of PEFC by decreasing protonic current density from 0.72 A/cm~2 to 0.25 A/cm~2 at a constant cell voltage of 0.7 V. Foreign cation decreases the oxygen diffusivity causing a decrease in dissolved oxygen concentration in CCL. It also decreases the equilibrium potential due to reduction in proton concentration in the ionomer phase in cathode.
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机译：建立了稳态的一维计算模型，以预测外来阳离子污染对聚合物电解质燃料电池（PEFC）的影响。该模型解决了阳离子，氧气和水的耦合迁移现象。在0.7 V的恒定电池电压下，通过将质子电流密度从0.72 A / cm〜2降低到0.25 A / cm〜2，发现气流中的外来阳离子（即Na〜+）污染显着降低了PEFC的性能。阳离子会降低氧的扩散率，从而降低CCL中的溶解氧浓度。由于阴极离聚物相中质子浓度的降低，它也降低了平衡电位。
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