电极结构对质子交换膜燃料电池性能的影响

Effect of electrode structures on the performance of proton exchange membrane fuel cell

采用沉积法制备质子交换膜燃料电池电极，研究了电极结构对电池性能的影响。催化层内憎水材料聚四氟乙烯（ＰＴＦＥ）形成憎水孔，为气体传递提供通道，减小传质过电位，但是过多的ＰＴＦＥ将增大电子阻力；催化层内浸入质子导体Ｎａｆｉｏｎ，为质子传递提供通道，增大电化学反应界面，提高催化剂的利用率，但过多的Ｎａｆｉｏｎ将减少气体通道，增大气体传递阻力；同样催化层中催化剂亦有最适值，过少不能满足电极电化学反应的要求，过多将增大气体和质子传递阻力。本文所制的电极在获得最佳电池性能时，催化层内催化剂Ｐｔ为６ｍｇ／ｃｍ２，Ｎａｆｉｏｎ为０．５ｍｇ／ｃｍ２，ＰＴＦＥ为１０％。

The effects of electrode structures on the performance of PEMFC were studied in this paper.And the best performance was obtained with the electrodes formed from Pt 6 mg/cm 2,Nafion 0.5mg/cm 2 and 10% PTFE in the catalyst layer.More electrode materials would increase mass transport,but less of those could not provide enough electrochemical reaction areas.