期刊
JOURNAL OF POWER SOURCES
卷 336, 期 -, 页码 455-464出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2016.11.003
关键词
Graphene foams; Volumetric capacitance; Areal capacitance; Flexible; Supercapacitors
资金
- National Natural Science Foundation of China [61376011, 51362026]
3D flexible O/N co-doped graphene foams (GF) have been designed and fabricated successfully via combining the compression/hot curing strategy with chemical reduction and hydrothermal treatment, in which melamine foams were used not only as the source of N/O functional groups for the introduction of pseudocapacitance but also as the sacrificial template to inhibit the agglomeration of graphene. Also, the mechanism for method of the compressing/hot curing has been investigated systematically. And the resultant GF demonstrates excellent mechanical strength and flexibility. When the compacting GF is used as free-standing electrodes for supercapacitor, it exhibits more excellent ability of charge storage than that of pristine graphene foams. And 10 MPa-GF electrodes delivers high areal capacitance of 375 mu F cm(-2) at a current density of 1 A g(-1), excellent rate capabilities and superior cycling stability of above 100%. According to the analysis of capacitance contribution for 10 MPa-GF electrode, the pseudocapacitance originated from N/O functional groups is up to-65% of the contribution of total capacitance. Moreover, the symmetric supercapacitor comprised of 10 MPa-GF electrodes presents a maximum energy density of 16 Wh kg(-1) (8 Wh L-1) and a maximum power density of 17 kW kg(-1) (8.6 kW L-1). Published by Elsevier B.V.
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