Abstract: A comprehensive along-flow-channel two-dimensional mathematical model with a catalyst layer model for both electrodes was developed for PEMFC to investigate the water transport process within membrane and its effect on fuel cell performance.Computational results showed that as the cathode inlet humidity decreased from 100% to 10%, ohmic loss of electrolyte increased from 0.15 V to 0.36 V due to the dehydration of membrane near the cathode, and activation loss decreased from 0.45 V to 0.22 V with the increase of oxygen concentration.The polarization curves predicted by the model at different relative humidity values agree well with the published experimental data.

Key words: 质子交换膜燃料电池, 相对湿度, 水净迁移系数, 综合数值模型

摘要： 采用全电池催化层模型建立一个沿流道方向的燃料电池二维综合数值模型，研究不同供气湿度条件下膜内水迁移过程及其对输出性能的影响。计算结果显示：阴极进口相对湿度从100%变为10%，阴极侧膜失水导致电解质膜欧姆极化损失由0.15 V增大至0.36 V;随着相对湿度减小氧气浓度增大，阴极活化极化损失由0.45 V减小为0.22 V。模型预测的不同相对湿度条件下极化曲线和文献中实验数据吻合很好。

关键词: 质子交换膜燃料电池, 相对湿度, 水净迁移系数, 综合数值模型