Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 861, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2020.157963
Keywords
Supercapacitor; Carbon nanotubes aerogels; Thermal excitation; NiCo2O4; Rate capability
Categories
Funding
- National Natural Science Foundation of China [51676103]
- Taishan Scholar Project of Shandong Province [ts20190937]
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The NF@NiCo2O4/CNTs composite material, prepared by the method of free arc thermal excitation, exhibits remarkable electrochemical properties as an electrode for supercapacitors due to the high conductivity of CNTs aerogels and sufficient active sites of NiCo2O4 nanoneedles.
Herein, the method of free arc thermal excitation is developed to disperse CNTs agglomerations to fluffy CNTs aerogels on Ni foam@NiCo2O4 nanoneedles (NF@NiCo2O4/CNTs). NF@NiCo2O4/CNTs is evaluated as an electrode for supercapacitor and shows remarkable electrochemical properties, which is resulted from the synergistic effect of high conductive CNTs aerogels and sufficient active sites of NiCo2O4 nanoneedles. The mass specific capacity and rate capability of NF@NiCo2O4/CNTs are 20% and 14% higher than that of NF@NiCo2O4 due to the high conductivity of CNTs aerogels. The assembled NF@NiCo2O4/CNTs//activated carbon (AC) device exhibites an exellent energy density of 43.2 Wh kg(-1) when the power density is 801 W kg(-1). The asymmetric device also has a high cycling stability that the energy density can remain 85% after 5000 cycles. More importantly, the new strategy offers an ingratiating strategy to disperse CNTs losslessly, meanwhile provides a new view into the combination of CNTs and various active materials for supercapacitor electrodes. (C) 2020 Elsevier B.V. All rights reserved.
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