TITLE

Sulfonated derivatives of polyparaphenylene as proton conducting membranes for direct methanol fuel cell application

AUTHOR(S)
Le Ninivin, C.; Balland-Longeau, A.; Demattei, D.; Coutanceau, C.; Lamy, C.
PUB. DATE
November 2004
SOURCE
Journal of Applied Electrochemistry;Nov2004, Vol. 34 Issue 11, p1159
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Proton conducting polymers derived from polybenzoyl-1,4-phenylene (PBP) and poly-p-phenoxybenzoyl-1,4-phenylene (PPBP) were synthesized by the 'Colon synthesis technique'. The sulfonation of these proton conducting polymers was carried out using either sulphuric acid or tetramethylsiliylchlorosulfonate (TMSCl) as sulfonating agent, and their thermal properties were evaluated. Both sulfonated PBP and PPBP are thermally stable up to at least 215 ŶC. The sulfonated sPPBP exhibited good conductivity as proton conducting membranes at room temperature and were tested as electrolyte membranes for a single direct methanol fuel cell (DMFC) in terms of water absorption, methanol permeability and electrical performance. The water uptake of the sPPBP was found to be larger than that of the sPBP, i.e., 65 and 43 mol%, respectively. The permeability to methanol was found to be 10 times lower than sPPBP and sPBP compared to a NafionŴ membrane. In spite of this, performance in a single DMFC was found to be twice inferior to that with NafionŴ 117. Optimisation of the sulfonation level and of the electrode-membrane interfaces was lead to better results.
ACCESSION #
60215251

 

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