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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 O 2  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.

chemsuschem

Influence of Additives on the Reversible Oxygen Reduction Reaction/Oxygen Evolution Reaction in the Mg 2+ ‐Containing Ionic Liquid  N ‐Butyl‐ N ‐Methylpyrrolidinium Bis(Trifluoromethanesulfonyl)imide