期刊
JOURNAL OF MEMBRANE SCIENCE
卷 342, 期 1-2, 页码 208-214出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.memsci.2009.06.042
关键词
Wet phase inversion; Porous polyimide; Composite membrane; Proton conductivity; Direct methanol fuel cell
资金
- Nanyang Technological University [ARC11/06]
- Ministry of Education, Singapore
We have synthesized a porous co-polyimide film by coagulating a polyimide precursor in the non-solvent and thermal imidization. Factors affecting the morphology, pore size, porosity, and mechanical strength of the film were discussed. The porous polyimide matrix consists of a porous top layer and a spongy sub-structure with micropores. It is used as a porous matrix to construct sulfonated poly(styrene-ran-ethylene) (SPSE) infiltrated composite membrane for direct methanol fuel cell (DMFC) application. Due to the complete inertness to methanol and the very high mechanical strength of the polyimide matrix, the swelling of the composite membrane is greatly suppressed and the methanol crossover is also significantly reduced, while high proton conductivity is still maintained. Because of its higher proton conductivity and less methanol permeability, single fuel cell performance test demonstrated that this composite membrane outperformed Nafion membrane. Based on these results, SPSE/polyimide composite membrane has great potential to be used in DMFCs. (c) 2009 Elsevier B.V. All rights reserved.
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