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Influence of Additives on the Reversible Oxygen Reduction Reaction/Oxygen Evolution Reaction in the Mg²⁺‐Containing Ionic Liquid N ‐Butyl‐N ‐Methylpyrrolidinium Bis(Trifluoromethanesulfonyl)imide

Eckardt, M.; Alwast, D.; Schnaidt, J.; Behm, R. J.

Abstract:
The influence of different additives on the oxygen reduction reaction/oxygen evolution reaction (ORR/OER) in magnesium‐containing N ‐butyl‐N ‐methylpyrrolidinium bis(trifluoromethanesulfonyl)imide ([BMP][TFSI]) on a glassy carbon electrode was investigated to gain a better understanding of the electrochemical processes in Mg–air batteries. 18‐Crown‐6 was used as a complexing agent for Mg ions to hinder the passivation caused by their reaction with ORR products such as superoxide and peroxide anions. Furthermore, borane dimethylamine complex (NBH) was used as a potential water‐removing agent to inhibit electrode passivation by reacting with trace impurities of water. The electrochemical processes were characterized by differential electrochemical mass spectrometry to monitor the consumed and evolved O2 in the ORR/OER and determine the number of transferred electrons. Crown ether and NBH efficiently masked Mg$^{2+}$. A stochiometric excess of crown ether resulted in reduced formation of a passivation layer, whereas at too high concentrations the reversibility of the ORR/OER was diminished.

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Verlagsausgabe §
DOI: 10.5445/IR/1000120250
Veröffentlicht am 25.06.2020
Originalveröffentlichung
DOI: 10.1002/cssc.202000672
Scopus
Zitationen: 1
Web of Science
Zitationen: 1
Cover der Publikation
Zugehörige Institution(en) am KIT Helmholtz-Institut Ulm (HIU)
Post Lithium Storage (POLiS)
Publikationstyp Zeitschriftenaufsatz
Publikationsdatum 07.08.2020
Sprache Englisch
Identifikator ISSN: 1864-5631, 1864-564X
KITopen-ID: 1000120250
HGF-Programm 37.01.01 (POF III, LK 01) Fundamentals and Materials
Erschienen in ChemSusChem
Verlag Wiley-VCH Verlag
Band 13
Heft 15
Seiten 3919-3927
Bemerkung zur Veröffentlichung This article also appears in: Energy Storage and Conversion Research at Science City Ulm
Vorab online veröffentlicht am 21.04.2020
Nachgewiesen in Web of Science
Scopus
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