Structure-property-performance relationships of sulfonated poly(arylene ether sulfone)s as a polymer electrolyte for fuel cell applications |
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Authors: | Yu Seung Kim Mehmet Sankir Bryan S. Pivovar |
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Affiliation: | a Electronic and Electrochemical Materials and Devices, MST-11, MS-D429, Los Alamos National Laboratory, Los Alamos, NM 87545, USA b Department of Chemistry and Materials Research Institute, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061, USA |
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Abstract: | This article focuses on structure-property-performance relationships of directly copolymerized sulfonated polysulfone polymer electrolyte membranes. The chemical structure of the bisphenol-based disulfonated polysulfones was systematically alternated by introducing fluorine moieties or other polar functional groups such as benzonitrile or phenyl phosphine oxide in the copolymer backbone. Ac impedance measurements of the polymer electrolyte membranes indicated that fluorine incorporation increased proton conductivity, while polar functional group incorporation decreased conductivity. Likewise, other properties such as water uptake and ion exchange capacity are impacted by the incorporation of fluorine moiety or polar groups. These properties are critically tied with H2/air and direct methanol fuel cell performance. We have rationalized fuel cell performance of these selected copolymers in light of structure-property relationships, which gives useful insight for the development and application of next generation polymer electrolytes. |
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Keywords: | Poly(arylene ether sulfone) Polymer electrolyte membrane Proton conductivity |
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