The oxygen reduction/evolution reaction (ORR/OER) mechanisms in nonaqueous Li-O2 batteries have been investigated by using electron paramagnetic resonance spectroscopy in this work. We identified the superoxide radical anion (O2•-) as an intermediate in the ORR process using 5,5-dimethyl-pyrroline N-oxide as a spin trap, while no O2•- in OER was detected during the charge process. These findings provide insightful understanding on the fundamental oxygen reaction mechanisms in rechargeable nonaqueous Li-O2 batteries.
Revised: November 11, 2014 |
Published: September 30, 2014
Citation
Cao R., E.D. Walter, W. Xu, E.N. Nasybulin, P. Bhattacharya, M.E. Bowden, and M.H. Engelhard, et al. 2014.The Mechanisms of Oxygen Reduction and Evolution Reactions in Nonaqueous Lithium-Oxygen Batteries.ChemSusChem 7, no. 9:2436-2440.PNNL-SA-101742.doi:10.1002/cssc.201402315