Abstract
In this paper a critical study is presented on how the direct methanol fuel cell (DMFC) membrane properties are affected by a pre‐treatment. Membranes based on sulfonated poly(ether ether ketone) (sPEEK) with sulfonation degree (SD) of 42% were used, plain and modified inorganically with 1 wt.% of zirconium oxide. Nafion® 1135 was used as reference. The results obtained show that the sPEEK polymer (SD=42%) enables the preparation of proton exchange membranes with improved properties compared to Nafion® and to the ZrO2‐modified sPEEK membrane, mainly due to its improved relation between proton conductivity and methanol permeation. After the pre‐treatment, the plain sPEEK membrane had a performance 6.4 times higher in terms of maximum power output when used in the DMFC.
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