Durability and stability test of proton exchange membrane fuel cells prepared from polybenzimidazole/poly(tetrafluoro ethylene) composite membrane
Durability and stability test of proton exchange membrane fuel cells prepared from polybenzimidazole/poly(tetrafluoro ethylene) composite membrane
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DOI：
10.1016/j.jpowsour.2009.01.062
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发表时间：
2009-08-01
影响因子：
9.2
通讯作者：
Chen, L. C.
中科院分区：
文献类型：
--
作者：
Lin, H. L.;Hsieh, Y. S.;Chen, L. C.
据报道，将薄的多孔聚四氟乙烯（厚度为15 - 20μm）浸渍在聚苯并咪唑（PBI）/N,N'-二甲基乙酰胺（DMAc）溶液中，可以制备出一种薄的聚苯并咪唑（PBI）/聚四氟乙烯（PTFE）复合膜（厚度为25 - 30μm）。在本文中，使用由PBI/PTFE复合膜制备的燃料电池在160℃、电流密度i = 200 mA/cm²的条件下进行了400小时的寿命测试。在长时间测试过程中，每12小时进行一次i - V曲线和交流阻抗测量。实验数据显示有240小时的活化期。240小时后，电池电压开始下降。交流阻抗测量表明，在最初的240小时寿命测试中，内阻（Rs）和电荷转移电阻（Rct）下降，然后Rs几乎保持不变，而240小时后Rct增加。燃料电池性能的下降可归因于磷酸从膜中迁移出来，导致膜与电极之间分层。（C）2009爱思唯尔有限公司。保留所有权利。
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.