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Understanding Multi-Ion Transport Mechanisms in Bipolar Membranes

Bui, Justin C. and Digdaya, Ibadillah and Xiang, Chengxiang and Bell, Alexis T. and Weber, Adam Z. (2020) Understanding Multi-Ion Transport Mechanisms in Bipolar Membranes. ACS Applied Materials & Interfaces, 12 (47). pp. 52509-52526. ISSN 1944-8244. https://resolver.caltech.edu/CaltechAUTHORS:20201110-121459166

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Abstract

Bipolar membranes (BPMs) have the potential to become critical components in electrochemical devices for a variety of electrolysis and electrosynthesis applications. Because they can operate under large pH gradients, BPMs enable favorable environments for electrocatalysis at the individual electrodes. Critical to the implementation of BPMs in these devices is understanding the kinetics of water dissociation that occurs within the BPM as well as the co- and counter-ion crossover through the BPM, which both present significant obstacles to developing efficient and stable BPM-electrolyzers. In this study, a continuum model of multi-ion transport in a BPM is developed and fit to experimental data. Specifically, concentration profiles are determined for all ionic species, and the importance of a water-dissociation catalyst is demonstrated. The model describes internal concentration polarization and co- and counter-ion crossover in BPMs, determining the mode of transport for ions within the BPM and revealing the significance of salt-ion crossover when operated with pH gradients relevant to electrolysis and electrosynthesis. Finally, a sensitivity analysis reveals that the performance and lifetime of BPMs can be improved substantially by using of thinner dissociation catalysts, managing water transport, modulating the thickness of the individual layers in the BPM to control salt-ion crossover, and increasing the ion-exchange capacity of the ion-exchange layers in order to amplify the water-dissociation kinetics at the interface.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1021/acsami.0c12686DOIArticle
ORCID:
AuthorORCID
Bui, Justin C.0000-0003-4525-957X
Digdaya, Ibadillah0000-0001-7349-0934
Xiang, Chengxiang0000-0002-1698-6754
Bell, Alexis T.0000-0002-5738-4645
Weber, Adam Z.0000-0002-7749-1624
Additional Information:© 2020 American Chemical Society. Received: July 14, 2020; Accepted: October 23, 2020; Published: November 10, 2020. This material is based on work performed at the Joint Center for Artificial Photosynthesis, a DOE Energy Innovation Hub, supported through the Office of Science of the U.S. Department of Energy under award number DE-SC0004993 and the National Institutes of Health under grant no. S10OD023532. J.C.B. acknowledges funding from the National Science Foundation Graduate Research Fellowship under grant no. DGE 1752814. The authors would also like to thank David Vermaas, Philomena Weng, and Andrew Crothers for insightful and fruitful discussions regarding the nature of ionic transport in bipolar membranes. The authors declare no competing financial interest.
Group:JCAP
Funders:
Funding AgencyGrant Number
Department of Energy (DOE)DE-SC0004993
NIHS10OD023532
NSF Graduate Research FellowshipDGE-1752814
Subject Keywords:bipolar membrane, transport, model, electrochemistry, ionomers, electrolysis, CO2 reduction, water splitting
Issue or Number:47
Record Number:CaltechAUTHORS:20201110-121459166
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20201110-121459166
Official Citation:Understanding Multi-Ion Transport Mechanisms in Bipolar Membranes. Justin C. Bui, Ibadillah Digdaya, Chengxiang Xiang, Alexis T. Bell, and Adam Z. Weber. ACS Applied Materials & Interfaces 2020 12 (47), 52509-52526; DOI: 10.1021/acsami.0c12686
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:106589
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:10 Nov 2020 21:15
Last Modified:25 Nov 2020 17:56

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