无外增湿操作质子交换膜燃料电池

Operating proton-exchange membrane fuel cells without external humidification

采用Nafion112膜组装 5cm2 活性面积质子交换膜燃料电池 (PEMFC) ,在无外增湿反应气体条件下试验了氢气和氧气并流和逆流时电池的工作性能。实验结果发现 :气体并流时 ,电池的最佳工作温度是 6 0℃ ;气体逆流时 ,电池可以在 80℃稳定工作 ,且性能与外增湿条件下的电池性能相比无明显下降。将PEMFC的活性面积放大到 14 0cm2 ,电池仍可以在气体逆流、80℃和无外增湿条件下稳定工作。

Proton exchange membrane fuel cell(PEMFC) with the active area of 5 cm 2 was fabricated by adopting Nafion 112 membrane. The performances of the PEMFC were evaluated without external humidification for the reactant gases when the hydrogen and the oxygen were in co flow or in counter flow. The results show that the PEMFC demonstrates the best performance at 60 ℃ when the hydrogen and the oxygen are in co flow, while it can be operated steady at 80 ℃ when the gases are in counter flow. The performance of the PEMFC without external humidification has a little difference from that of the PEMFC with external humidification. Moreover, the PEMFC can still be operated steady in counter flow at 80 ℃ without external humidification when its active area is extended to 140 cm 2 fabricated with Nafion 112 membrane.