Title: Celtec-V: a polybenzimidazole-based membrane for the direct methanol fuel cell
Authors: Gubler, Lorenz
Kramer, Denis 
Belack, Jörg
Ünsal, Ömer
Schmidt, Thomas Justus
Scherer, Günther G.
Language: en
Keywords: direct methanol fuel cells;proton exchange membrane fuel cells;current density
Subject (DDC): DDC::500 Naturwissenschaften und Mathematik::540 Chemie::541 Physikalische Chemie
Issue Date: 30-Jul-2007
Publisher: Electrochemical Society (ECS)
IOP Publishing
Document Type: Article
Journal / Series / Working Paper (HSU): Journal of the Electrochemical Society : JES 
Volume: 154
Issue: 9
Page End: B981
Pages: B987
Publisher Place: Pennington, NJ
Bristol
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.
Organization Units (connected with the publication): Electrochemistry Laboratory, Paul Scherrer Institut, 5232 Villigen PSI, Switzerland
ISSN: 0013-4651
DOI: 10.1149/1.2754078
Appears in Collections:Publications of the HSU Researchers (before HSU)

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