PEMFC催化层中PTFE和Nafion对催化剂利用率的影响  

Influence of PTFE and Nafion on the UtilizationEfficiency of Pt/C Catalyst in PEMFC

作　　者：程晓亮[1] 衣宝廉[1] 张景新[1] 韩明[1] 乔亚光[1] 

机构地区：[1]中科院大连化学物理研究所

出　　处：《电化学》1999年第2期218-223,共6页Journal of Electrochemistry

摘　　要：本文利用循环伏安法，结合透射电镜和扫描电镜研究了质子膜燃料电池催化层中加入的聚四氟乙烯（ＰＴＦＥ）和全氟磺酸树脂（Ｎａｆｉｏｎ）对催化剂利用率的影响．ＰＴＦＥ对催化剂利用率的影响很小．但在亲水型电极中，催化剂颗粒之间的电子导通会受到Ｎａｆｉｏｎ的阻碍，并导致催化剂利用率降低．由于Ｎａｆｉｏｎ分子很小。With cycling voltammetry curve(C-V), TEM and SEM photographs, the influence of PTFE and Nafion on the platinum utilization in catalyst layer of PEMFC was investigated. The results show that in gas diffusion electrode, the blocking effect of PTFE in the platinum utilization is not pronunced. In the thin_film catalyst layer, the electron conduct of the catalyst was blocked by the nafion solid and this caused the decrease of platinum utilization. With the increase of the nafion content in the catalyst layer, both platinum utilization and the electron conductivity decreased in the catalyst layer. Because the molecule size of nafion is smaller than that of Pt particles, there should no big problem for the contact between nafion and Pt particles.

关 键 词：PTFE NAFION 质子膜燃料电池 催化剂利用率 

分 类 号：TM911.48[电气工程—电力电子与电力传动]