Electrochemical Reduction of O₂ in Ca²⁺ -Containing DMSO: Role of Roughness and Single Crystal Structure.

ABSTRACT: In this study, the oxygen reduction reaction (ORR) in Ca²⁺ -containing dimethyl sulfoxide (DMSO) at well-ordered and rough electrode surfaces is compared by using cyclic voltammetry, differential electrochemical mass spectrometry, rotating ring disk electrode, and atomic force microscopy measurements. Slightly soluble CaO₂ is the main product during early ORR on gold electrodes; after completion of a monolayer of CaO and/or CaO₂ , which is formed in parallel and in competition to the peroxide, only superoxide is formed. When the monolayer is completely closed on smooth annealed Au, no further reduction occurs, whereas on rough Au a defect-rich layer allows for continuous formation of superoxide. CaO₂ formed either via two subsequent 1  e - tran

SUBMITTER: Kollisch-Mirbach A 

PROVIDER: S-EPMC8252535 | biostudies-literature | 2021 Jun

REPOSITORIES: biostudies-literature