Permselectivity and Ionic Conductivity Study of Na+ and Br− Ions in Graphene Oxide-Based Membranes for Redox Flow Batteries

Raphael Flack; Anna Aixalà-Perelló; Alessandro Pedico; Kobby Saadi; Andrea Lamberti; David Zitoun

doi:10.3390/membranes13080695

Permselectivity and Ionic Conductivity Study of Na⁺ and Br⁻ Ions in Graphene Oxide-Based Membranes for Redox Flow Batteries

Raphael Flack, Anna Aixalà-Perelló, Alessandro Pedico, Kobby Saadi, Andrea Lamberti, David Zitoun

Department of Chemistry

Research output: Contribution to journal › Article › peer-review

2 Scopus citations

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.

Original language	English
Article number	695
Journal	Membranes
Volume	13
Issue number	8
DOIs	https://doi.org/10.3390/membranes13080695
State	Published - 26 Jul 2023

Bibliographical note

Publisher Copyright:
© 2023 by the authors.

Funding

This work has been partially funded by the Israel Ministry of Energy within the project “the Orange Fuel” (Grant agreement #3-28571). R. F. acknowledges support from the Israel Ministry of Absorption. A. L. acknowledges partial support from the European Union’s Horizon 2020 research and innovation program within the project “Intelligent Water Treatment Technologies for Water Preservation Combined with Simultaneous Energy Production and Material Recovery in Energy Intensive Industries—intelWATT” (Grant agreement No 958454).

Funders	Funder number
Israel Ministry of Absorption
Horizon 2020 Framework Programme	958454
Ministry of Energy, Israel	3-28571

Keywords

functionalization
graphene oxide
nanostructured materials
permselectivity
proton exchange membrane
redox flow batteries

Access to Document

10.3390/membranes13080695

Cite this

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title = "Permselectivity and Ionic Conductivity Study of Na+ and Br− Ions in Graphene Oxide-Based Membranes for Redox Flow Batteries",

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{\textquoteright}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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AU - Pedico, Alessandro

AU - Saadi, Kobby

AU - Lamberti, Andrea

AU - Zitoun, David

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