期刊
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
卷 7, 期 14, 页码 12447-12456出版社
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.9b02013
关键词
NiCo2O4; Carbon coating; Nanowire arrays; Binder free; Asymmetric supercapacitor; Long cycling stability
资金
- NSFC [21727810, 21475035]
- Foundation for Innovative Research Groups of NSFC [21521063]
Ternary NiCo2O4 has attracted tremendous interest as a type of prospective electrochemical energy storage material. Hence, a facile and economical preparation method for N-doped carbon-coated NiCo2O4 (NiCo204@NC) nanowire array electrodes is reported by simply dipping the NiCo(2)O(4)nanowire arrays grown on Ni foam substrate into a dopamine aqueous solution followed by annealing in an argon atmosphere. The hybrid NiCo2O4@NC nanowire arrays grown on a Ni foam substrate is directly employed as a 3D-structure porous electrode without adhesive. Compared with the original NiCo2O4 nanowire array electrode, the hierarchical hybrid NiCo2O4@NC nanowire array electrode delivers a higher capacitance, better rate performance, and excellent stability (final capacity remains 91.3% at 10 A g(-1) after 5000 test cycles). An asymmetric supercapacitor based on NiCo2O4@NC//active carbon is designed and achieves a high energy density of 29.4 Wh kg(-1) at a power density of 349 W kg(-1) with superior capacitance retention of 97.3% at 5 A g(-1) after 15,000 cycles. The improvement of the electrochemical energy storage property demonstrates the potential of the hierarchical NiCo2O4@NC nanowire array electrode in the electrochemical energy field.
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