Singlet Oxygen Formation during the Oxygen Reduction Reaction in DMSO LiTFSI on Lithium Air Battery Carbon Electrodes

CALVO, ERNESTO J.; CÓRDOBA, DANIEL; RODRÍGUEZ, HERNÁN B.

ChemistrySelect

Wikey-VCH

Lugar: Weinheim; Año: 2019 vol. 4 p. 12304 - 12307

2365-6549

Formation of singlet oxygen,1O2, during the O2 electroreductionreaction (ORR) on carbon electrode in Lithium bis-(trifluoromethylsulfonyl)imide (LiTFSI) dimethyl sulfoxide (DMSO)electrolyte has been detected ?in-operando? by fluorescencequenching of 9,10-dimethylanthracene, DMA. Furthermore, theformation of 1O2 during ORR requires Li+ ions, while in thepresence of the efficient physical 1O2 quencher, sodium azide,DMA fluorescence quenching is negligible. Addition of Li+ ionsto superoxide solution in DMSO formed by ORR enhances DMAquenching, which is a proof that 1O2 results from superoxidebimolecular disproportionation.