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

被引：355

作者：

Yoo, Eunjoo ^{[1
]}

Zhou, Haoshen ^{[1
]}

机构：

[1] Natl Inst Adv Ind Sci & Technol, Energy Technol Res Inst, Tsukuba, Ibaraki 3058568, Japan

来源：

ACS NANO | 2011年 / 5卷 / 04期

关键词：

graphene nanosheets (GNSs); air-electrode; discharge overpotential; hybrid electrolyte; Li-air battery; ELECTRODE; STORAGE; SHEETS; O-2;

D O I：

10.1021/nn200084u

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Metal-free graphene nanosheets (GNSs) were examined for use as air electrodes in a U-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 sp(3) 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 GNS5 when used in a rechargeable U-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.

引用

页码：3020 / 3026

页数：7

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