Triarylamines as Catholytes in Aqueous Organic Redox Flow Batteries.

Autor: Farag NL; Department of Chemistry, Yusuf Hamied Department of Chemistry, University of Cambridge, Lensfield Rd, Cambridge, CB2 1EW, United Kingdom., Jethwa RB; Institute of Science and Technology, Am Campus 1, Klosterneuberg, 3400, Austria., Beardmore AE; Department of Chemistry, Yusuf Hamied Department of Chemistry, University of Cambridge, Lensfield Rd, Cambridge, CB2 1EW, United Kingdom., Insinna T; Department of Chemistry, Yusuf Hamied Department of Chemistry, University of Cambridge, Lensfield Rd, Cambridge, CB2 1EW, United Kingdom., O'Keefe CA; Department of Chemistry, Yusuf Hamied Department of Chemistry, University of Cambridge, Lensfield Rd, Cambridge, CB2 1EW, United Kingdom., Klusener PAA; Shell Global Solutions International B.V., Energy Transition Campus Amsterdam, Grasweg 31, 1031 HW, Amsterdam, The Netherlands., Grey CP; Department of Chemistry, Yusuf Hamied Department of Chemistry, University of Cambridge, Lensfield Rd, Cambridge, CB2 1EW, United Kingdom., Wright DS; Department of Chemistry, Yusuf Hamied Department of Chemistry, University of Cambridge, Lensfield Rd, Cambridge, CB2 1EW, United Kingdom.
Jazyk: angličtina
Zdroj: ChemSusChem [ChemSusChem] 2023 Jul 07; Vol. 16 (13), pp. e202300128. Date of Electronic Publication: 2023 May 09.
DOI: 10.1002/cssc.202300128
Abstrakt: A series of triarylamines was synthesised and screened for their suitability as catholytes in redox flow batteries using cyclic voltammetry (CV). Tris(4-aminophenyl)amine was found to be the strongest candidate. Solubility and initial electrochemical performance were promising; however, polymerisation was observed during electrochemical cycling leading to rapid capacity fade prescribed to a loss of accessible active material and the limitation of ion transport processes within the cell. A mixed electrolyte system of H 3 PO 4 and HCl was found to inhibit polymerisation producing oligomers that consumed less active material reducing rates of degradation in the redox flow battery. Under these conditions Coulombic efficiency improved by over 4 %, the maximum number of cycles more than quadrupled and an additional theoretical capacity of 20 % was accessed. This paper is, to our knowledge, the first example of triarylamines as catholytes in all-aqueous redox flow batteries and emphasises the impact supporting electrolytes can have on electrochemical performance.
(© 2023 The Authors. ChemSusChem published by Wiley-VCH GmbH.)
Databáze: MEDLINE
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