Morphology and performance of stretched PFSA for direct methanol fuel cells

Wenjing Zhang, Daniel Lee Kish, Peter N. Pintauro

Research output: Contribution to journalConference articleResearchpeer-review


Uniaxial stretching was used to promote desirable morphological changes to membranes composed of 3M Corporation's 825 equivalent weight (EW) perfluorosulfonic acid (PFSA) polymer. Stretching of solution cast PFSA films to a draw ratio of 4 was carried out prior to a high temperature annealing step. Film stretching increased the polymer crystallinity by 22% with an improvement in the membrane's mechanical properties. There was a small increase in proton conductivity after stretching, with a substantial decrease in methanol permeability. In direct methanol fuel cell tests at 60°C and 1.0 M methanol, the power density at 0.4 V with a stretched 3M 825 EW membrane was 72 mW/cm2, which was considerably greater that that obtained with a solution cast unstretched membrane (28 mW/cm2) or with a commercial Nafion 117 membrane (55 mW/cm2). ©The Electrochemical Society.
Original languageEnglish
JournalE C S Transactions
Issue number1
Pages (from-to)635-645
Publication statusPublished - 2010
Externally publishedYes
Event10th Polymer Electrolyte Fuel Cell Symposium; 218th ECS Meeting - Las Vegas, NV, United States
Duration: 10 Oct 201015 Oct 2010


Conference10th Polymer Electrolyte Fuel Cell Symposium; 218th ECS Meeting
CountryUnited States
CityLas Vegas, NV

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