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Open AccessArticle

Design and Optimization of a Hyper-Branched Polyimide Proton Exchange Membrane with Ultra-High Methanol-Permeation Resistivity for Direct Methanol Fuel Cells Applications

by Liying Ma 1, Guoxiao Xu 2, Shuai Li 2, Jiao Ma 1, Jing Li 2,* and Weiwei Cai 2,*
1
School of Chemistry and Materials Science, Guizhou Normal University, 116 Baoshan North Road, Guiyang 550001, China
2
Sustainable Energy Laboratory, Faculty of Materials Science and Chemistry, China University of Geosciences Wuhan, 388 Lumo RD, Wuhan 430074, China
*
Authors to whom correspondence should be addressed.
Polymers 2018, 10(10), 1175; https://doi.org/10.3390/polym10101175
Received: 25 September 2018 / Revised: 15 October 2018 / Accepted: 18 October 2018 / Published: 22 October 2018
(This article belongs to the Special Issue Polymers for Modern and Advanced Engineering Applications)
A hyper-branched sulfonated polyimide (s-PI) was synthesized successfully and composited with polyvinylidene fluoride (PVDF) to achieve ultra-high methanol-permeation resistive for direct methanol fuel cell application. The optimized s-PI-PVDF composite membrane exhibited methanol resistivity low to 1.80 × 10−8 cm2/s, two orders of magnitude lower than the value of the commercial Nafion 117 membrane (60 × 10−7 cm2/s). At the same time, the tensile strength of the composite membrane is 22 MPa, which is comparable to the value of the Nafion 117 membrane. Therefore, the composite membrane is promising for application in direct methanol fuel cell. View Full-Text
Keywords: proton exchange membrane; direct methanol fuel cell; methanol resistivity; composite membrane proton exchange membrane; direct methanol fuel cell; methanol resistivity; composite membrane
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Ma, L.; Xu, G.; Li, S.; Ma, J.; Li, J.; Cai, W. Design and Optimization of a Hyper-Branched Polyimide Proton Exchange Membrane with Ultra-High Methanol-Permeation Resistivity for Direct Methanol Fuel Cells Applications. Polymers 2018, 10, 1175.

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