Durability and stability test of proton exchange membrane fuel cells prepared from polybenzimidazole/poly(tetrafluoro ethylene) composite membrane

被引:47
作者
Lin, H. L. [1 ]
Hsieh, Y. S. [1 ]
Chiu, C. W. [1 ]
Yu, T. L. [1 ]
Chen, L. C. [1 ]
机构
[1] Yuan Ze Univ, Fuel Cells Ctr, Dept Chem Engn & Mat Sci, Tao Yuan 32003, Taiwan
关键词
Polybenzimidazole; Poly(tetrafluoro ethylene); Composite membrane; Fuel cell; Durability; ACID DOPED POLYBENZIMIDAZOLE; HIGH-TEMPERATURE PEMFC; POLYMER ELECTROLYTE; LIFE TEST; PBI; CONDUCTIVITY; DEGRADATION;
D O I
10.1016/j.jpowsour.2009.01.062
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
It has been reported that a thin polybenzimidazole (PBI)/poly(tetrafluoro ethylene) (PTFE) composite membrane (thickness 25-30 mu m) can be prepared by impregnating a thin porous PTFE (thickness 15-20 mu m) in a PBI/N,N'-dimethyl actamide (DMAc) solution. In this paper, a 400 h life test of a fuel cell prepared from PBI/PTFE composite membrane was carried out at 160 degrees C with a current density i = 200 mA cm(-2). During long time test, the i-V curve and AC-impedance measurements were conducted every 12 h. The experiment data showed a 240 h period of activation. After 240 h the cell voltage started to decay. AC-impedance measurements showed internal resistance (R-s) and charge transfer resistance (R-s) decreased in the initial 240 h life test and then R-s remained almost constant and R-s increased after 240 h. The decay of fuel cell performance can be attributed to the migration of phosphoric acid out from membrane leading to the delamination between membrane and electrodes. (C) 2009 Elsevier B.V. All rights reserved.
引用
收藏
页码:170 / 174
页数:5
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