期刊
CHEMISTRY-A EUROPEAN JOURNAL
卷 19, 期 32, 页码 10716-10722出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201300679
关键词
electrochemistry; graphene; quantitative oxidation; surface functionalities; tunable C; O ratios
资金
- National Natural Science Foundation of China [50872016, 20973033, 51125009]
- National Natural Science Foundation for Creative Research Group [21221061]
- Hundred Talents Program of the Chinese Academy of Sciences
We report an electrochemical oxidation route to tunable C/O ratios in the graphene framework, creating enhanced pseudocapacitance with increasing oxygen content. Controlled surface functionalities on graphene enable a high specific capacitance and negligible electric conductivity loss. A specific capacitance of up to 279 Fg(-1) was achieved for the functionalized graphene at a discharge current of 1 Ag-1 in 1m H2SO4 electrolyte; this capacitance remained as high as 152 Fg(-1) at 100 Ag-1. These values are much higher than those of non-oxidized graphene. These excellent performances of the functionalized graphene signify the importance of precise control of the surface chemistry of graphene-based materials.
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