Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Analysis of the Composition of Bromide Anion Oxidation Products in Aqueous Solutions with Different pH via Rotating Ring-Disk electrode Method

Version 1 : Received: 3 August 2022 / Approved: 9 August 2022 / Online: 9 August 2022 (03:32:02 CEST)

A peer-reviewed article of this Preprint also exists.

Pichugov, R.; Konev, D.; Speshilov, I.; Abunaeva, L.; Petrov, M.; Vorotyntsev, M.A. Analysis of the Composition of Bromide Anion Oxidation Products in Aqueous Solutions with Different pH via Rotating Ring-Disk Electrode Method. Membranes 2022, 12, 820. Pichugov, R.; Konev, D.; Speshilov, I.; Abunaeva, L.; Petrov, M.; Vorotyntsev, M.A. Analysis of the Composition of Bromide Anion Oxidation Products in Aqueous Solutions with Different pH via Rotating Ring-Disk Electrode Method. Membranes 2022, 12, 820.

Journal reference: Membranes 2022, 12, 820
DOI: 10.3390/membranes12090820

Abstract

We measured the ring collection coefficient of bromide anion oxidation products in a neutral and slightly alkaline medium on a rotating ring-disk electrode (glassy carbon disk, platinum ring) varying the following parameters: disk electrode rotation velocity, sodium bromide concentration, pH of the medium (in the range of 6 – 12), anode current on the disk and the electroreduction potential of the bromide anion oxidation products on the ring. The data obtained is presented via dependences of the cathode ring current to the disk current ratio vs the ring electrode potential. The analysis of the results was carried out by comparing the experimental polarization curves of the ring electrode with the data of cyclic voltammetry in model solutions to determine the electrical activities of various bromine compounds in positive oxidation states. We claim that RRDE method could be used to obtain quantitative and qualitative data on the electrooxidation of bromide ion in neutral and alkaline solutions. For the most effective regeneration of the spent oxidizer the values of pH > 10 and moderate concentrations of NaBr should be used.

Keywords

ring rotating disk electrode (RRDE); voltametric analysis; flow battery, bromide oxidation)

Subject

CHEMISTRY, Electrochemistry

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