期刊
ADVANCED MATERIALS
卷 30, 期 26, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201800963
关键词
direct growth; graphene capsules; Nb2O5 nanowires; plasma-enhanced CVD; sodium-ion hybrid supercapacitors
类别
资金
- National Natural Science Foundation of China [51520105003, 51432002, 51675275, 51702225, 21473119]
- Jiangsu Youth Science Foundation [BK20170336]
- Suzhou Key Laboratory for Advanced Carbon Materials and Wearable Energy Technologies, Suzhou, China
Sodium-ion hybrid supercapacitors (Na-HSCs) by virtue of synergizing the merits of batteries and supercapacitors have attracted considerable attention for high-energy and high-power energy-storage applications. Orthorhombic Nb2O5 (T-Nb2O5) has recently been recognized as a promising anode material for Na-HSCs due to its typical pseudocapacitive feature, but it suffers from intrinsically low electrical conductivity. Reasonably high electrochemical performance of T-Nb2O5-based electrodes could merely be gained to date when sufficient carbon content was introduced. In addition, flexible Na-HSC devices have scarcely been demonstrated by far. Herein, an in situ encapsulation strategy is devised to directly grow ultrathin graphene shells over T-Nb2O5 nanowires (denoted as Gr-Nb2O5 composites) by plasma-enhanced chemical vapor deposition, targeting a highly conductive anode material for Na-HSCs. The few-layered graphene capsules with ample topological defects would enable facile electron and Na+ ion transport, guaranteeing rapid pseudocapacitive processes at the Nb2O5/electrolyte interface. The Na-HSC full-cell comprising a Gr-Nb2O5 anode and an activated carbon cathode delivers high energy/power densities (112.9 Wh kg(-1)/80.1 W kg(-1) and 62.2 Wh kg(-1)/5330 W kg(-1)), outperforming those of recently reported Na-HSC counterparts. Proof-of-concept Na-HSC devices with favorable mechanical robustness manifest stable electrochemical performances under different bending conditions and after various bending-release cycles.
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