碱性阴离子交换膜燃料电池实验及数值模拟

针对碱性阴离子交换膜燃料电池(AEMFC)水管理开展了实验及数值模拟工作,使用Tokuyama A201膜制备并组装了实验室规模的AEMFC单电池,建立了一个基于质量守恒、组分守恒及电荷守恒的碱性阴离子交换膜燃料电池二维稳态等温模型,用于研究电池性能及内部水传输机理。通过模型计算分析电池性能及内部水传输和水分布情况,结果表明:计算预测得到的特定参数下的极化曲线趋势与单电池测试的数据吻合良好;电流密度增加会增大水从阳极到阴极的净通量,有利于阴极反应的进行;电池两极均需进气加湿,提高阳极进气湿度可以加快水从阳极到阴极的净迁移,在较高电流密度下阴极进气湿度过低对电池性能影响较大。

Transport of water in an anion exchange membrane fuel cell

This paper aimed to study the water management of alkaline anion exchange membrane fuel cells (AEMFC) via experiments and numerical simulations. Tokuyama A201 membrane was used to prepare and assemble a laboratory-scale AEMFC single cell. A two-dimensional steady-state isothermal model of the AEMFC was established to study the battery performance and internal water transport mechanisms. The model was based on mass conservation, composition conservation, and charge conservation, and considered the electrochemical reactions inside the battery. The battery performance and internal water transport and water distribution were analyzed through model calculations. The results show that the calculated polarization curve trend under certain parameters was in good agreement with the data obtained from the single cell tests. An increase in current density increased the net flux of water from the anode to the cathode, which was conducive to the reaction of the cathode. The anode and cathode both required humidification. Increasing the anode inlet gas humidity could speed up the net migration of water from the anode to the cathode. Too low inlet gas humidity of the cathode had a great impact on cell performance at high current densities.