Title
Direct Detection of the Superoxide Anion as a Stable Intermediate in the Electroreduction of Oxygen in a Non-Aqueous Electrolyte Containing Phenol as a Proton Source
Document Type
Article
Publication Date
7-6-2015
Abstract
The non-aqueous Li-air (O2 ) battery has attracted intensive interest because it can potentially store far more energy than today's batteries. Presently Li-O2 batteries suffer from parasitic reactions owing to impurities, found in almost all non-aqueous electrolytes. Impurities include residual protons and protic compounds that can react with oxygen species, such as the superoxide (O2 (-) ), a reactive, one-electron reduction product of oxygen. To avoid the parasitic reactions, it is crucial to have a fundamental understanding of the conditions under which reactive oxygen species are generated in non-aqueous electrolytes. Herein we report an in situ spectroscopic study of oxygen reduction on gold in a dimethyl sulfoxide electrolyte containing phenol as a proton source. It is shown directly that O2 (-) , not HO2 , is the first stable intermediate during the oxygen reduction process to hydrogen peroxide. The unusual stability of O2 (-) is explained using density functional theory (DFT) calculations.
Publication Source (Journal or Book title)
Angewandte Chemie (International ed. in English)
First Page
8165
Last Page
8
Recommended Citation
Peng, Z., Chen, Y., Bruce, P. G., & Xu, Y. (2015). Direct Detection of the Superoxide Anion as a Stable Intermediate in the Electroreduction of Oxygen in a Non-Aqueous Electrolyte Containing Phenol as a Proton Source. Angewandte Chemie (International ed. in English), 54 (28), 8165-8. https://doi.org/10.1002/anie.201502039