Journal
ACS APPLIED POLYMER MATERIALS
Volume 1, Issue 4, Pages 631-635Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsapm.9b00005
Keywords
ionomer thin-films; hygrothermal aging; nanostructure; domain orientation; time constant; water transport kinetics
Funding
- Fuel Cell Technologies Office, Energy Efficiency and Renewable Energy Office, of the U.S. Department of Energy (DOE) [DE-AC02-05CH11231]
- University of California Chancellors Fellowship
- Office of Science, Office of Basic Energy Sciences, of the U.S. DOE [DE-AC02-05CH11231]
- Office of Science of the U.S. DOE [DE-SC0004993]
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Impacts of processing, storage, and operation on thin-film perfluorosulfonic acid (PFSA) ionomer coatings used in electrodes of electrochemical devices remains unestablished. In this work, alteration of structure-function relationship in ionomers is achieved via exposure to elevated temperature and humidity (hygrothermal aging). Findings reflect a strong inverse correlation between aging-induced ionomer thin-film domain orientation and water-transport kinetics evaluated from swelling. Impact of aging is shown to be more pronounced on platinum due to interactions with PFSA, as evidenced by greater increase in nanodomain orientation parallel to substrate accompanied by reduced water transport, in contrast to silicon support.
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