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NiCo 2 O 4 /C Core‐Shell Nanoneedles on Ni Foam for All‐Solid‐State Asymmetric Supercapacitors
Author(s) -
Li Yaoyin,
Wang Qiyuan,
Shao Jian,
Li Kang,
Zhao Weiwei
Publication year - 2020
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.202001254
Subject(s) - supercapacitor , capacitance , materials science , power density , electrochemistry , electrode , energy storage , solid state , current density , energy density , chemical engineering , nanotechnology , power (physics) , chemistry , physics , quantum mechanics , theoretical physics , engineering
Herein, NiCo 2 O 4 /C core‐shell nanoneedles grown on Ni foam are prepared by a simple route and applied in supercapacitors. Electrochemical results show that the area specific capacitance of NiCo 2 O 4 /C reaches 2057 mF/cm 2 at 1 mA/cm 2 , which is about 4 times than that of the pristine NiCo 2 O 4 . The electrode exhibits excellent rate capability (92 % of capacitance retention at 10 mA/cm 2 ) and remarkable cycling stability (81 % of capacitance retention after 10000 cycles). The as‐fabricated all‐solid‐state asymmetric supercapacitor (NiCo 2 O 4 /C//AC(active carbon)) achieves an energy density of 2 mW h cm −3 at a power density of 37 mW cm −3 and remains 1.6 mW h cm −3 at a power density of 120 mW cm −3 . Moreover, the ASC device can retain 87 % capacitance after 4000 cycles. The result reveals that it is a feasible method to achieve excellent performance in energy storage devices by the dipping method.