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Conductivity of PBI Membranes for High-Temperature Polymer Electrolyte Fuel Cells

Ma, Y.-L., Wainright, J. S., Litt, M. H., Savinell, R. F.·2004·Journal of The Electrochemical Society
DOI 10.1149/1.1630037
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Abstract

Polybenzimidazole (PBI) film, a candidate polymer electrolyte membrane (PEM) for high-temperature (120-200°C) fuel cells, was cast from PBI / trifluoacetyl / H 3 PO 4 solution with constant molecular weight PBI powder and various acid doping levels. Conductivity measurements on these membranes were performed using an ac method under controlled temperature and relative humidity (RH). A complete set of conductivity data for H 3 PO 4 acid-doped PBI is presented as a function of temperature (60-200°C), RH (5-30%), and acid doping level (300-600 mol %). A mechanism of conductivity is proposed for the proton migration in this PBI/acid system based on this and previous work. Proton transfer in this system appears to occur along different paths for different doping levels, RHs, and temperatures. Hydrogen bonds immobilize the anions and form a network for proton transfer by a Grotthuss mechanism. The rate of proton transfer involving H 2 O is faster, leading to higher conductivity at higher RH. The order of the rate of proton transfer between various species is H 3 PO 4 ( H 2 PO 4 − ) … H ­ O ­ H > H 3 PO 4 … H 2 PO 4 − > N ­ H + … H 2 PO 4 − , N ­ H + … H ­ O ­ H > N ­ H + … N ­ H . The upper limit of proton conductivity is given by the conductivity of the liquid state H 3 PO 4 . © 2003 The Electrochemical Society. All rights reserved.

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Metadata

Authors
Ma, Y.-L., Wainright, J. S., Litt, M. H., & Savinell, R. F.
Venue
Journal of The Electrochemical Society
Publisher
The Electrochemical Society
Published
2004
Volume
151
Issue
1
Pages
A8
ISSN
0013-4651 (ISSN-L)
DOI
10.1149/1.1630037
OpenAlex
W2080123787
Cited by
716
References
7
FWCI
17.43
Type
journal article
Language
en
Open access
closed

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CoChat. (2026). Citation check: Conductivity of PBI Membranes for High-Temperature Polymer Electrolyte Fuel Cells. https://app.cochat.ai/papers/10.1149/1.1630037
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Ma, Y.-L., Wainright, J. S., Litt, M. H., & Savinell, R. F. (2004). Conductivity of PBI Membranes for High-Temperature Polymer Electrolyte Fuel Cells. Journal of The Electrochemical Society. https://doi.org/10.1149/1.1630037

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