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Kim N, Oh W, Knust KN, Zazyki Galetto F, Su X. Molecularly Selective Polymer Interfaces for Electrochemical Separations. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2023; 39:16685-16700. [PMID: 37955994 DOI: 10.1021/acs.langmuir.3c02389] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2023]
Abstract
The molecular design of polymer interfaces has been key for advancing electrochemical separation processes. Precise control of molecular interactions at electrochemical interfaces has enabled the removal or recovery of charged species with enhanced selectivity, capacity, and stability. In this Perspective, we provide an overview of recent developments in polymer interfaces applied to liquid-phase electrochemical separations, with a focus on their role as electrosorbents as well as membranes in electrodialysis systems. In particular, we delve into both the single-site and macromolecular design of redox polymers and their use in heterogeneous electrochemical separation platforms. We highlight the significance of incorporating both redox-active and non-redox-active moieties to tune binding toward ever more challenging separations, including structurally similar species and even isomers. Furthermore, we discuss recent advances in the development of selective ion-exchange membranes for electrodialysis and the critical need to control the physicochemical properties of the polymer. Finally, we share perspectives on the challenges and opportunities in electrochemical separations, ranging from the need for a comprehensive understanding of binding mechanisms to the continued innovation of electrochemical architectures for polymer electrodes.
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Affiliation(s)
- Nayeong Kim
- Department of Chemical and Biomolecular Engineering, University of Illinois Urbana-Champaign, Urbana, Illinois 61801, United States
| | - Wangsuk Oh
- Department of Chemical and Biomolecular Engineering, University of Illinois Urbana-Champaign, Urbana, Illinois 61801, United States
| | - Kyle N Knust
- Department of Chemistry, Millikin University, 1184 W. Main Street, Decatur, Illinois 62522, United States
| | - Fábio Zazyki Galetto
- Departamento de Química, Universidade Federal de Santa Catarina (UFSC), Florianopolis SC 88040-900, Brazil
| | - Xiao Su
- Department of Chemical and Biomolecular Engineering, University of Illinois Urbana-Champaign, Urbana, Illinois 61801, United States
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Flack R, Aixalà-Perelló A, Pedico A, Saadi K, Lamberti A, Zitoun D. Permselectivity and Ionic Conductivity Study of Na + and Br - Ions in Graphene Oxide-Based Membranes for Redox Flow Batteries. MEMBRANES 2023; 13:695. [PMID: 37623756 PMCID: PMC10456580 DOI: 10.3390/membranes13080695] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/20/2023] [Revised: 07/16/2023] [Accepted: 07/21/2023] [Indexed: 08/26/2023]
Abstract
Permselectivity of a membrane is central for the development of electrochemical energy storage devices with two redox couples, such as redox flow batteries (RFBs). In RFBs, Br3-/Br- couple is often used as a catholyte which can cross over to the anolyte, limiting the battery's lifetime. Naturally, the development of permselective membranes is essential to the success of RFBs since state-of-the-art perfluorosulfonic acid (PFSA) is too costly. This study investigates membranes of graphene oxide (GO), polyvinylpyrrolidone (PVP), and imidazole (Im) as binder and linker, respectively. The GO membranes are compared to a standard PFSA membrane in terms of ionic conductivity (Na+) and permselectivity (exclusion of Br-). The ionic conduction is evaluated from electrochemical impedance spectroscopy and the permselectivity from two-compartment diffusion cells in a four-electrode system. Our findings suggest that the GO membranes reach conductivity and permselectivity comparable with standard PFSA membranes.
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Affiliation(s)
- Raphael Flack
- Department of Chemistry, Institute for Nanotechnology and Advanced Materials (BINA), Bar Ilan University, Ramat Gan 590002, Israel; (R.F.); (K.S.)
| | - Anna Aixalà-Perelló
- Dipartimento di Scienza Applicata e Tecnologia (DISAT), Politecnico di Torino, Corso Duca degli Abruzzi, 24, 10129 Torino, Italy; (A.A.-P.); (A.P.); (A.L.)
- Istituto Italiano di Tecnologia, Center for Sustainable Future Technologies, Via Livorno 60, 10140 Torino, Italy
| | - Alessandro Pedico
- Dipartimento di Scienza Applicata e Tecnologia (DISAT), Politecnico di Torino, Corso Duca degli Abruzzi, 24, 10129 Torino, Italy; (A.A.-P.); (A.P.); (A.L.)
- Istituto Italiano di Tecnologia, Center for Sustainable Future Technologies, Via Livorno 60, 10140 Torino, Italy
| | - Kobby Saadi
- Department of Chemistry, Institute for Nanotechnology and Advanced Materials (BINA), Bar Ilan University, Ramat Gan 590002, Israel; (R.F.); (K.S.)
| | - Andrea Lamberti
- Dipartimento di Scienza Applicata e Tecnologia (DISAT), Politecnico di Torino, Corso Duca degli Abruzzi, 24, 10129 Torino, Italy; (A.A.-P.); (A.P.); (A.L.)
- Istituto Italiano di Tecnologia, Center for Sustainable Future Technologies, Via Livorno 60, 10140 Torino, Italy
| | - David Zitoun
- Department of Chemistry, Institute for Nanotechnology and Advanced Materials (BINA), Bar Ilan University, Ramat Gan 590002, Israel; (R.F.); (K.S.)
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Kim JM, Lin YH, Aravindhan PP, Beckingham BS. Impact of hydrophobic pendant phenyl groups on transport and co-transport of methanol and acetate in PEGDA-SPMAK cation exchange membranes. Chem Eng Res Des 2022. [DOI: 10.1016/j.cherd.2022.07.017] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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