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Synthesis and characterization of sulfonated polysulfone membranes for direct methanol fuel cells
Ist Teil von
Journal of power sources, 2006-06, Vol.157 (1), p.222-225
Ort / Verlag
Lausanne: Elsevier B.V
Erscheinungsjahr
2006
Quelle
Elsevier ScienceDirect Journals
Beschreibungen/Notizen
Sulfonated polysulfones (SPSf) with different degree of sulfonation (DS) have been synthesized and evaluated as proton exchange membranes in direct methanol fuel cell (DMFC). The membranes have been characterized by ion exchange capacity (IEC), proton conductivity, liquid uptake, and single DMFC polarization measurements. The proton conductivities of the SPSf membranes increase with increasing sulfonation, but are lower than that of Nafion 115. Within the range of sulfonation of 50–70%, the SPSf membranes exhibit better performances in DMFC than Nafion 115 at lower methanol concentrations (1
M) despite lower proton conductivities due to suppressed methanol permeability and crossover. However, the performances of SPSf membranes at higher methanol concentrations (2
M) are inferior to that of Nafion 115 at current densities higher than about 50
mA
cm
−2 as the suppression in methanol crossover could not quite compensate for the lower proton conductivities.