Celtec-V: a polybenzimidazole-based membrane for the direct methanol fuel cell
Publication date
2007-07-30
Document type
Research article
Author
Organisational unit
Electrochemistry Laboratory, Paul Scherrer Institut, 5232 Villigen PSI, Switzerland
ISSN
Series or journal
Journal of the Electrochemical Society : JES
Periodical volume
154
Periodical issue
9
Peer-reviewed
✅
Part of the university bibliography
Nein
Keyword
direct methanol fuel cells
proton exchange membrane fuel cells
current density
Abstract
Celtec-V is a proton exchange membrane based on polybenzimidazole (PBI) comprising an interpenetrating network of polyvinylphosphonic acid designed for application in the direct methanol fuel cell. The properties and fuel cell performance of Celtec-V are investigated and compared against a Nafion 117 standard. It is shown that with the PBI-based membrane, fuel cell performance can be sustained to higher methanol feed concentration at around half the methanol crossover rate. Above 1.0 M methanol, Celtec-V outperforms Nafion 117. Furthermore, lower water permeation is observed, with Celtec-V having an electro-osmotic drag coefficient of around 1 compared to a value of 4-5 for Nafion 117. Room for improvement is identified in the ohmic resistance of the membrane and the cathode-membrane interface, where higher losses are observed at increasing current density.
Version
Not applicable (or unknown)
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