Influence of loading, metallic surface state and surface protection in precious group metal hydrogen electrocatalyst for H2/Br2 redox-flow batteries

Saadi, Kobby; Hardisty, Samuel S.; Tatus-Portnoy, Zhanna; Zitoun, David

doi:10.1016/j.jpowsour.2022.231494

Cited by 7 publications

(1 citation statement)

References 31 publications

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“…For instance, commercial vanadium RFBs display a high LCOS, partly due to the cost of the vanadium electrolyte. Among the alternatives, the high-power H 2 /Br 2 RFB has been extensively studied and has shown the crossover as the main Achilles heel of the technology [ 2 , 3 , 4 , 5 , 6 ]. Other chemistries, like Zn/Br 2 and polysulfide/bromine, also suffer from the crossover of bromide species [ 7 ].…”

Section: Introductionmentioning

confidence: 99%

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

Flack,

Aixalà-Perelló,

Pedico

et al. 2023

Membranes

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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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