Bromine Crossover in Operando Analysis of Proton Exchange Membranes in Hydrogen-Bromate Flow Batteries.

Autor: Modestov A; Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, 119071 Moscow, Russia., Kartashova N; EMCPS Department, Mendeleev University of Chemical Technology of Russia, 125047 Moscow, Russia., Pichugov R; EMCPS Department, Mendeleev University of Chemical Technology of Russia, 125047 Moscow, Russia., Petrov M; EMCPS Department, Mendeleev University of Chemical Technology of Russia, 125047 Moscow, Russia., Antipov A; EMCPS Department, Mendeleev University of Chemical Technology of Russia, 125047 Moscow, Russia., Abunaeva L; EMCPS Department, Mendeleev University of Chemical Technology of Russia, 125047 Moscow, Russia.
Jazyk: angličtina
Zdroj: Membranes [Membranes (Basel)] 2022 Aug 22; Vol. 12 (8). Date of Electronic Publication: 2022 Aug 22.
DOI: 10.3390/membranes12080815
Abstrakt: The manuscript deals with the fundamental problem of platinum hydrogen oxidation catalyst poisoning of the hybrid chemical power source based on bromate electroreduction and hydrogen electro-oxidation reactions. The poisoning is caused by the crossover of bromine-containing species through the proton exchange membrane separating compartments of the flow cell. Poisoning results in a drastic decrease in the flow cell performance. This paper describes the results of the direct measurement of bromine-containing species' crossover through perfluorosulfonic acid membranes of popular vendors in a hydrogen-bromate flow cell and proposes corresponding scenarios for the flow battery charge-discharge operation based on the electrolyte's control of the pH value. The rate of the crossover of the bromine-containing species through the membrane is found to be inversely proportional to the membrane thickness.
Databáze: MEDLINE
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