Thermally crosslinked sulfonated polyethersulfone proton exchange membranes for direct methanol fuel cells

Title
Thermally crosslinked sulfonated polyethersulfone proton exchange membranes for direct methanol fuel cells
Author(s)
김혜경이원목[이원목]길승철[길승철]김진철[김진철]안대희[안대희]장진성[장진성]정진철[정진철]임승엽[임승엽]정두환[정두환]
Keywords
POLYMER ELECTROLYTE MEMBRANES; DIMETHYLSILOXANE; COPOLYMERS; COMPOSITE; KETONE)
Issue Date
201211
Publisher
ELSEVIER SCIENCE BV
Citation
JOURNAL OF MEMBRANE SCIENCE, v.417, pp.2 - 9
Abstract
Sulfonated polyethersulfones (sPES) with thermally crosslinkable allyl or propargyl endgroups were synthesized and evaluated as methanol-tolerant proton exchange membranes (PEMs) for use in a direct methanol fuel cell (DMFC). sPES with a controlled degree of sulfonation (DS) were generated by direct copolycondensation of sulfonated and nonsulfonated dichloro-monomers with bisphenol-A, and synthesis of crosslinkable sPES was completed by subsequent end group modification with allyl or propargyl halide. Dissolved polymers were simply cast to tough membranes that underwent thermal crosslinking at an elevated temperature. The final PEMs were obtained after further cation exchange of the membranes to generate the protonated form. The PEM films were rigorously characterized to elucidate their electrochemical and mechanical properties. It was found that the allyl-terminated sPES generally showed higher proton conductivity and methanol permeability than the propargyl-terminated counterparts with a similar DS, plausibly due to lower crosslinking reactivity of the allyl group relative to the propargyl groups. The allyl-terminated sPES was successfully fabricated into a membrane electrode assembly (MEA) by using sPES/Nafion mixed ionomers as the binder, and a power performance of 23.5 mW/cm(2) was achieved in a DMFC single cell test in air-breathing semi-passive mode after activation for six days. (C) 2012 Elsevier B.V. All rights reserved.
URI
http://hdl.handle.net/YU.REPOSITORY/26947http://dx.doi.org/10.1016/j.memsci.2012.05.064
ISSN
0376-7388
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공과대학 > 신소재공학부 > Articles
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