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Impacts of Organic Sorbates on Ionic Conductivity and Nanostructure of Perfluorinated Sulfonic-Acid Ionomers

preprint
submitted on 02.03.2021, 01:14 and posted on 03.03.2021, 07:12 by Adlai Katzenberg, Andrea Angulo, Ahmet Kusoglu, Miguel Modestino

This study provides insights into structure-property relationships of Nafion membranes swollen with organic sorbates, revealing correlations between sorbate polarity, ionomer domain structure, and ionic conductivity. Swelling, nanostructure, and ionic conductivity of Nafion in the presence of short-chain alcohols and alkanes was studied by infrared spectroscopy, X-ray scattering, and voltammetry. Nafion equilibrated with alkanes exhibited negligible uptake and nanoswelling, while alcohols induced nanoscopic- to macroscopic- swelling ratios that increased with alcohol polarity. In mixed-sorbate environments including organics and water, alcohols preserved the overall ionomer domain structure but altered the matrix to enable higher sorbate uptake. Alkanes did not demonstrably alter the hydrated nanostructure or conductivity. Identifying the impacts of organic sorbates on structure-property relationships in ionomers such as Nafion is imperative as membrane-based electrochemical devices find applications in emerging areas ranging from organic fuel cells to the synthesis of fuels and chemicals.

Funding

National Science Foundation (1943972)

Department of Energy Hydrogen and Fuel Cell Technologies Office (DE-AC02-05CH11231)

History

Email Address of Submitting Author

modestino@nyu.edu

Institution

New York University

Country

United States

ORCID For Submitting Author

0000-0003-2100-7335

Declaration of Conflict of Interest

no conflict of interest

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