Impact of hygrothermal aging on structure/function relationship of perfluorosulfonic-acid membrane
Abstract
Perfluorosulfonic-acid (PFSA) membranes are widely used as the solid electrolyte in electrochemical devices where their main functionalities are ion (proton) conduction and gas separation in a thermomechanically stable matrix. Due to prolonged operational requirements in these devices, PFSA membranes' properties change with time due to hygrothermal aging. This paper studies the evolution of PFSA structure/property relationship changes during hygrothermal aging, including chemical changes leading to changes in ion-exchange capacity (IEC), nanostructure, water-uptake behavior, conductivity, and mechanical properties. Our findings demonstrate that with hygrothermal aging, the storage modulus increases, while IEC and water content decrease, consistent with the changes in nanostructure, that is, water- and crystalline-domain spacings inferred from small- and wide-angle X-ray scattering (SAXS/WAXS) experiments. In addition, the impact of aging is found to depend on the membrane's thermal prehistory and post-treatments, although universal correlations exist between nanostructural changes and water uptake. The findings have impact on understanding lifetime, durability, and use of these and related polymers in various technologies.
- Authors:
-
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Tianjin Univ., Tianjin (China)
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Publication Date:
- Research Org.:
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1329879
- Alternate Identifier(s):
- OSTI ID: 1454456
- Report Number(s):
- LA-UR-15-24975
Journal ID: ISSN 0887-6266
- Grant/Contract Number:
- AC52-06NA25396; AC02-05CH11231
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Polymer Science. Part B, Polymer Physics
- Additional Journal Information:
- Journal Volume: 54; Journal Issue: 5; Journal ID: ISSN 0887-6266
- Publisher:
- Wiley
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 30 DIRECT ENERGY CONVERSION; energy sciences; fuel cell; PFSA ionomers; ion-exchange capacity; structure/property; SAXS/WAXS; hygrothermal ageing
Citation Formats
Shi, Shouwen, Dursch, Thomas J., Blake, Colin, Mukundan, Rangachary, Borup, Rodney L., Weber, Adam Z., and Kusoglu, Ahmet. Impact of hygrothermal aging on structure/function relationship of perfluorosulfonic-acid membrane. United States: N. p., 2015.
Web. doi:10.1002/polb.23946.
Shi, Shouwen, Dursch, Thomas J., Blake, Colin, Mukundan, Rangachary, Borup, Rodney L., Weber, Adam Z., & Kusoglu, Ahmet. Impact of hygrothermal aging on structure/function relationship of perfluorosulfonic-acid membrane. United States. https://doi.org/10.1002/polb.23946
Shi, Shouwen, Dursch, Thomas J., Blake, Colin, Mukundan, Rangachary, Borup, Rodney L., Weber, Adam Z., and Kusoglu, Ahmet. Tue .
"Impact of hygrothermal aging on structure/function relationship of perfluorosulfonic-acid membrane". United States. https://doi.org/10.1002/polb.23946. https://www.osti.gov/servlets/purl/1329879.
@article{osti_1329879,
title = {Impact of hygrothermal aging on structure/function relationship of perfluorosulfonic-acid membrane},
author = {Shi, Shouwen and Dursch, Thomas J. and Blake, Colin and Mukundan, Rangachary and Borup, Rodney L. and Weber, Adam Z. and Kusoglu, Ahmet},
abstractNote = {Perfluorosulfonic-acid (PFSA) membranes are widely used as the solid electrolyte in electrochemical devices where their main functionalities are ion (proton) conduction and gas separation in a thermomechanically stable matrix. Due to prolonged operational requirements in these devices, PFSA membranes' properties change with time due to hygrothermal aging. This paper studies the evolution of PFSA structure/property relationship changes during hygrothermal aging, including chemical changes leading to changes in ion-exchange capacity (IEC), nanostructure, water-uptake behavior, conductivity, and mechanical properties. Our findings demonstrate that with hygrothermal aging, the storage modulus increases, while IEC and water content decrease, consistent with the changes in nanostructure, that is, water- and crystalline-domain spacings inferred from small- and wide-angle X-ray scattering (SAXS/WAXS) experiments. In addition, the impact of aging is found to depend on the membrane's thermal prehistory and post-treatments, although universal correlations exist between nanostructural changes and water uptake. The findings have impact on understanding lifetime, durability, and use of these and related polymers in various technologies.},
doi = {10.1002/polb.23946},
journal = {Journal of Polymer Science. Part B, Polymer Physics},
number = 5,
volume = 54,
place = {United States},
year = {Tue Oct 20 00:00:00 EDT 2015},
month = {Tue Oct 20 00:00:00 EDT 2015}
}
Web of Science
Figures / Tables:
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