Phosphoric acid doped polybenzimidazole membranes: Physiochemical characterization and fuel cell applications [PEM fuel cells]

Li Qingfeng, Hans Aage Hjuler, Niels Bjerrum

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

A polymer electrolyte membrane fuel cell operational at temperatures around 150-200 degrees C is desirable for fast electrode kinetics and high tolerance to fuel impurities. For this purpose polybenzimidazole (PBI) membranes have been prepared and H/sub 3/PO/sub 4/-doped in a doping range from 300 to 1600 mol%. Physiochemical properties of the membrane electrolyte have been investigated by measurements of water uptake, acid doping level, electric conductivity, mechanical strength and water drag coefficient. Electrical conductivity is found to be insensitive to humidity but dependent on the acid doping level. At 160 degrees C a conductivity as high as 0.13 S cm/sup -1/ is obtained for membranes of high doping levels. Mechanical strength measurements show, however, that a high acid doping level results in poor mechanical properties. At operational temperatures up to 190 degrees C, fuel cells based on this polymer membrane have been tested with both hydrogen and hydrogen containing carbon monoxide.
Original languageEnglish
JournalJournal of Applied Electrochemistry
Volume31
Issue number7
Pages (from-to)773-779
ISSN0021-891X
Publication statusPublished - 2001

Fingerprint

Dive into the research topics of 'Phosphoric acid doped polybenzimidazole membranes: Physiochemical characterization and fuel cell applications [PEM fuel cells]'. Together they form a unique fingerprint.

Cite this