Demonstration of a 20 W class high-temperature polymer electrolyte fuel cell stack with novel fabrication of a membrane electrode assembly

Title
Demonstration of a 20 W class high-temperature polymer electrolyte fuel cell stack with novel fabrication of a membrane electrode assembly
Authors
이혜진김병각이동훈박세진김용민이증우헨켄스마이어디억남석우김형준김화용김주용
Keywords
Polymer electrolyte; High-temperature polymer electrolyte fuel cell; Phosphoric acid-doped; polybenzimidazole; Membrane electrolyte assembly; Fuel cell stack
Issue Date
2011-05
Publisher
International journal of hydrogen energy
Citation
VOL 36, NO 9, 5521-5526
Abstract
Acid-doped polybenzimidazole (PBI) membrane and polytetrafluoroethylene (PTFE)-based electrodes are used for the membrane electrode assembly (MEA) in high-temperature polymer electrolyte fuel cells (HTPEFCs). To find the optimum PTFE content for the catalyst layer, the PTFE ratio in the electrodes is varied from 25 to 50 wt%. To improve the performance of the electrodes, PBI is added to the catalyst layer. With a weight ratio of PTFE to Pt/C of 45:55 (45 wt% PTFE in the catalyst layer), the fuel cell shows good performance at 150 ℃ under non-humidified conditions. When 5 wt% PBI is added to the electrodes, performance is further improved (250 mA cm-2 at 0.6 V). Our 20 W class HTPEFC stack is fabricated with a novel MEA. This MEA consists of 8 layers (1 phosphoric aciddoped PBI membrane, 2 electrodes, 1 sub-gasket, 2 gas-diffusion media, 2 gas-sealing gaskets). The sub-gasket mitigates the destruction of a highly acid-doped PBI membrane and provides long-term durability to the fuel cell stack. The stack operates for 1200 h without noticeable cell degradation.
URI
http://pubs.kist.re.kr/handle/201004/39804
ISSN
0360-3199
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KIST Publication > Article
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