期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 142, 期 8, 页码 3742-3752出版社
AMER CHEMICAL SOC
DOI: 10.1021/jacs.9b09170
关键词
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资金
- U.S. Department of Energy, Office of Science, Office of Workforce Development for Teachers and Scientists, Office of Science Graduate Student Research (SCGSR) program
- ORAU [DE-SC0014664]
- DOE Office of Science User Facility [DE-AC02-05CH11231]
- DOE Office of Science [DE-SC0012704]
- National Science Foundation (NSF) Chemistry Research Instrumentation and Facilities Program [CHE-0840277]
- National Science Foundation (NSF) Materials Research Science and Engineering Center (MRSEC) Program [DMR-1420073]
- Department of Energy's Fuel Cell Technologies Office (DOEFCTO) under the FC-PAD consortium
Rapid improvements in polymer-electrolyte fuel-cell (PEFC) performance have been driven by the development of commercially available ion-conducting polymers (ionomers) that are employed as membranes and catalyst binders in membrane electrode assemblies. Commercially available ionomers are based on a perfluorinated chemistry comprised of a polytetrafluoroethylene (PTFE) matrix that imparts low gas permeability and high mechanical strength but introduces significant mass-transport losses in the electrodes. These transport losses currently limit PEFC performance, especially for low Pt loadings. In this study, we present a novel ionomer incorporating a glassy amorphous matrix based on a perfluoro(2-methylene-4-methyl-1,3-dioxolane) (PFMMD) backbone. The novel backbone chemistry induces structural changes in the ionomer, restricting ionomer domain swelling under hydration while disrupting matrix crystallinity. These structural changes slightly reduce proton conductivity while significantly improving gas permeability. The performance implications of this trade-off are assessed, which reveal the potential for substantial performance improvement by incorporation of highly permeable ionomers as the functional catalyst binder. These results underscore the significance of tailoring material chemistry to specific device requirements, where ionomer chemistry should be rationally designed to match the local transport requirements of the device architecture.
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