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

Research output: Contribution to journalArticlepeer-review

1 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 languageEnglish
Article number695
JournalMembranes
Volume13
Issue number8
DOIs
StatePublished - 26 Jul 2023

Bibliographical note

Publisher Copyright:
© 2023 by the authors.

Keywords

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

Fingerprint

Dive into the research topics of 'Permselectivity and Ionic Conductivity Study of Na+ and Br Ions in Graphene Oxide-Based Membranes for Redox Flow Batteries'. Together they form a unique fingerprint.

Cite this