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Title: Investigation of the electrocatalytic oxygen reduction and evolution reactions in lithium–oxygen batteries

Oxygen reduction and oxygen evolution reactions were examined on graphite electrodes with different crystal orientations. The kinetics for the redox couple O 2/O 2 •- are very fast, therefore no catalyst seems necessary to assist the charge transfer process. Apparently, the main source of the overpotential for the O 2 reduction reaction is from mass diffusion. Li 2O 2 becomes soluble in non-aqueous electrolytes in the presence of the tetraethylammonium tetrafluoroborate additive. The soluble B-O 2 2- ions can be oxidized electro-catalytically. The edge orientation of graphite demonstrates superior catalytic activity for the oxidation over basal orientation. The findings reveal an opportunity for recharging Li-air batteries efficiently and a new strategy of developing the catalyst for oxygen evolution reaction.
 [1] ;  [2] ;  [2] ;  [3] ;  [3] ;  [1]
  1. Univ. of Wisconsin Milwaukee, Milwaukee, WI (United States)
  2. Wuhan Univ. of Technology, Hubei (People's Republic of China)
  3. Brookhaven National Lab. (BNL), Upton, NY (United States)
Publication Date:
Grant/Contract Number:
Accepted Manuscript
Journal Name:
Journal of Power Sources
Additional Journal Information:
Journal Volume: 288; Journal Issue: C; Journal ID: ISSN 0378-7753
Research Org:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Office (EE-3V)
Country of Publication:
United States
25 ENERGY STORAGE; carbon edge and basal orientations; Li-air battery; electro-catalytic redox reaction of O2; Lewis acid; Li2O2 solubility
OSTI Identifier: