Isoindolinium Groups as Stable Anion Conductors for Anion-Exchange Membrane Fuel Cells and Electrolyzers.

Autor:	Aggarwal K; Schulich Faculty of Chemistry, Technion - Israel Institute of Technology, 3200008 Haifa, Israel., Gjineci N; Schulich Faculty of Chemistry, Technion - Israel Institute of Technology, 3200008 Haifa, Israel., Kaushansky A; Schulich Faculty of Chemistry, Technion - Israel Institute of Technology, 3200008 Haifa, Israel., Bsoul S; The Wolfson Department of Chemical Engineering, Technion - Israel Institute of Technology, 3200003 Haifa, Israel., Douglin JC; The Wolfson Department of Chemical Engineering, Technion - Israel Institute of Technology, 3200003 Haifa, Israel., Li S; The Wolfson Department of Chemical Engineering, Technion - Israel Institute of Technology, 3200003 Haifa, Israel., Salam I; Department of Chemistry, University of Surrey, Guildford GU2 7XH, U.K., Aharonovich S; Schulich Faculty of Chemistry, Technion - Israel Institute of Technology, 3200008 Haifa, Israel., Varcoe JR; Department of Chemistry, University of Surrey, Guildford GU2 7XH, U.K., Dekel DR; The Wolfson Department of Chemical Engineering, Technion - Israel Institute of Technology, 3200003 Haifa, Israel.; The Nancy & Stephen Grand Technion Energy Program (GTEP) - Israel Institute of Technology, 3200003 Haifa, Israel., Diesendruck CE; Schulich Faculty of Chemistry, Technion - Israel Institute of Technology, 3200008 Haifa, Israel.; The Nancy & Stephen Grand Technion Energy Program (GTEP) - Israel Institute of Technology, 3200003 Haifa, Israel.
Jazyk:	angličtina
Zdroj:	ACS materials Au [ACS Mater Au] 2022 Feb 23; Vol. 2 (3), pp. 367-373. Date of Electronic Publication: 2022 Feb 23 (Print Publication: 2022).
DOI:	10.1021/acsmaterialsau.2c00002
Abstrakt:	Anion-exchange membrane (AEM) fuel cells (AEMFCs) and water electrolyzers (AEMWEs) have gained strong attention of the scientific community as an alternative to expensive mainstream fuel cell and electrolysis technologies. However, in the high pH environment of the AEMFCs and AEMWEs, especially at low hydration levels, the molecular structure of most anion-conducting polymers breaks down because of the strong reactivity of the hydroxide anions with the quaternary ammonium (QA) cation functional groups that are commonly used in the AEMs and ionomers. Therefore, new highly stable QAs are needed to withstand the strong alkaline environment of these electrochemical devices. In this study, a series of isoindolinium salts with different substituents is prepared and investigated for their stability under dry alkaline conditions. We show that by modifying isoindolinium salts, steric effects could be added to change the degradation kinetics and impart significant improvement in the alkaline stability, reaching an order of magnitude improvement when all the aromatic positions are substituted. Density functional theory (DFT) calculations are provided in support of the high kinetic stability found in these substituted isoindolinium salts. This is the first time that this class of QAs has been investigated. We believe that these novel isoindolinium groups can be a good alternative in the chemical design of AEMs to overcome material stability challenges in advanced electrochemical systems. Competing Interests: The authors declare no competing financial interest. (© 2022 The Authors. Published by American Chemical Society.)
Databáze:	MEDLINE
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