The Oxygen Reduction Reaction in Ca -Containing DMSO: Reaction Mechanism, Electrode Surface Characterization, and Redox Mediation*.

In this study the fundamental understanding of the underlying reactions of a possible Ca-O battery using a DMSO-based electrolyte was strengthened. Employing the rotating ring disc electrode, a transition from a mixed process of O and O formation to an exclusive O formation at gold electrodes is observed. It is shown that in this system Ca-superoxide and Ca-peroxide are formed as soluble species.

K-O electrochemistry: achieving highly reversible peroxide formation.

Since the advent of the lithium-air battery, researchers have focused on understanding the underpinning mechanisms of the oxygen reduction and evolution reaction in aprotic solvents. In this work, the oxygen reaction in the presence of potassium ions in dimethyl sulfoxide was exploited as a model system to refine the present mechanistic picture of oxygen reduction in aprotic environments. In a combined approach utilizing differential electrochemical mass spectrometry in a generator-collector arrangement as well as classical electrochemical techniques, the reversible formation of insoluble peroxide as well as of slightly soluble superoxide is shown.

Fast and Simultaneous Determination of Gas Diffusivities and Solubilities in Liquids Employing a Thin-Layer Cell Coupled to a Mass Spectrometer, Part I: Setup and Methodology.

Transport properties and solubilities of volatile species in liquid solutions are of high interest in different chemical, biological, and physical systems. In this work, a new approach for determining the diffusivity and solubility of gases in liquids simultaneously is presented. The method presented relies on the diffusion of a volatile species through a thin, liquid layer and the subsequent detection of the species using a mass spectrometer.

Fast and Simultaneous Determination of Gas Diffusivities and Solubilities in Liquids Employing a Thin-Layer Cell Coupled to a Mass Spectrometer, Part II: Proof of Concept and Experimental Results.

A new method for simultaneously determining gas diffusivities and solubilities in liquids was presented and discussed in detail in Part I of this series. In this part of the series, the new measurement cell was employed to determine oxygen solubilities and diffusivities in 20 different dimethyl sulfoxide-based electrolytes. In addition, a comparison to values available in literature was made.