Li−Air Rechargeable Battery Based on Metal-free Graphene Nanosheet Catalysts

Metal-free graphene nanosheets (GNSs) were examined for use as air electrodes in a Li−air battery with a hybrid electrolyte. At 0.5 mA cm−1, the GNSs showed a high discharge voltage that was near that of the 20 wt % Pt/carbon black. This was ascribed to the presence of sp3 bonding associated with ed...

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Bibliographic Details
Published inACS nano Vol. 5; no. 4; pp. 3020 - 3026
Main Authors Yoo, Eunjoo, Zhou, Haoshen
Format Journal Article
LanguageEnglish
Published United States American Chemical Society 26.04.2011
Subjects
graphene nanosheets (GNSs)
Li−air battery
discharge overpotential
air-electrode
hybrid electrolyte
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Summary:Metal-free graphene nanosheets (GNSs) were examined for use as air electrodes in a Li−air battery with a hybrid electrolyte. At 0.5 mA cm−1, the GNSs showed a high discharge voltage that was near that of the 20 wt % Pt/carbon black. This was ascribed to the presence of sp3 bonding associated with edge and defect sites in GNSs. Moreover, heat-treated GNSs not only provided a similar catalytic activity in reducing oxygen in the air, but also showed a much more-stable cycling performance than GNSs when used in a rechargeable Li-air battery. This improvement resulted from removal of adsorbed functional groups and from crystallization of the GNS surface into a graphitic structure on heat treatment.
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ISSN:1936-0851
1936-086X
DOI:10.1021/nn200084u