Ionic Highways from Covalent Assembly in Highly Conducting and Stable Anion Exchange Membrane Fuel Cells
Name
doi-10.1021 jacs.9b08749 .pdf
Description
Accepted version
Size
2.56 MB
Format
Adobe PDF
Checksum (MD5)
b138b81c2bd8a98e7485c8dc4da46b47
Author(s)
Kim, Yoonseob
Wang, Yanming
France-Lanord, Arthur
Wang, Yichong
Wu, You-Chi Mason
Lin, Sibo
Li, Yifan
Grossman, Jeffrey C.
Swager, Timothy M
Date Issued
November 2019
Journal
Journal of the American Chemical Society
Publisher
American Chemical Society (ACS)
Citation
Kim, Yoonseob et al. "Ionic Highways from Covalent Assembly in Highly Conducting and Stable Anion Exchange Membrane Fuel Cells." Journal of the American Chemical Society 141, 45 (November 2019): 18152–18159 © 2019 American Chemical Society
Version
Author's final manuscript
Abstract
A major challenge in the development of anion exchange membranes for fuel cells is the design and synthesis of highly stable (chemically and mechanically) conducting membranes. Membranes that can endure highly alkaline environments while rapidly transporting hydroxides are desired. Herein, we present a design using cross-linked polymer membranes containing ionic highways along charge-delocalized pyrazolium cations and homoconjugated triptycenes. These ionic highway membranes show improved performance. Specifically, a conductivity of 111.6 mS cm-1 at 80 °C was obtained with a low 7.9% water uptake and 0.91 mmol g-1 ion exchange capacity. In contrast to existing materials, ionic highways produce higher conductivities at reduced hydration and ionic exchange capacities. The membranes retain more than 75% of their initial conductivity after 30 days of an alkaline stability test. The formation of ionic highways for ion transport is confirmed by density functional theory and Monte Carlo studies. A single cell with platinum metal catalysts at 80 °C showed a high peak density of 0.73 W cm-2 (0.45 W cm-2 from a silver-based cathode) and stable performance throughout 400 h tests.
MIT Department
Massachusetts Institute of Technology. Department of Chemistry
Massachusetts Institute of Technology. Department of Materials Science and Engineering
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DOI of Published Version
https://doi.org/10.1021/jacs.9b08749
