Trapped interfacial redox introduces reversibility in the oxygen reduction reaction in a non-aqueous Ca²⁺ electrolyte.

ABSTRACT: Electrochemical investigations of the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) have been conducted in a Ca²⁺-containing dimethyl sulfoxide electrolyte. While the ORR appears irreversible, the introduction of a tetrabutylammonium perchlorate (TBAClO₄) co-salt in excess concentrations results in the gradual appearance of a quasi-reversible OER process. Combining the results of systematic cyclic voltammetry investigations, the degree of reversibility depends on the ion pair competition between Ca²⁺ and TBA⁺ cations to interact with generated superoxide (O₂ ^-). When TBA⁺ is in larger concentrations, and large reductive overpotentials are applied, a quasi-reversible OER peak emerges with repe

SUBMITTER: Lu YT 

PROVIDER: S-EPMC8246276 | biostudies-literature | 2021 Jul

REPOSITORIES: biostudies-literature