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Carbon Nanotubes@Nickel Cobalt Sulfide Nanosheets for High‐Performance Supercapacitors
Author(s) -
Bian Ruilin,
Song Dan,
Si Wenping,
Zhang Tao,
Zhang Yuxin,
Lu Pengyi,
Hou Feng,
Liang Ji
Publication year - 2020
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.202000989
Subject(s) - supercapacitor , materials science , carbon nanotube , spinel , nickel sulfide , cobalt sulfide , composite number , cobalt , energy storage , electrochemistry , current density , sulfide , power density , electrode , nanotechnology , chemical engineering , composite material , metallurgy , chemistry , power (physics) , physics , quantum mechanics , engineering
As new and alternative energy storage devices to batteries and traditional capacitors, supercapacitors exhibit both high power and high energy density as well as good cycle life. NiCo 2 S 4 , a spinel‐structured transition metal sulfide with a high specific capacity, is considered to be a promising electrode material for supercapacitors with great application potential. However, the poor electrical conductivity of NiCo 2 S 4 results in poor rate and cycle performance of the material, which limits its practical application. In this work, we design a composite by loading NiCo 2 S 4 on the surface of carbon nanotubes (CNTs) to enhance the conductivity. The best‐performing CNTs@NiCo 2 S 4 electrode materials were obtained after the optimized heat‐treatment of CNTs@SiO 2 precursors. At a current density of 1 A g −1 , the CNTs@NiCo 2 S 4 composite exhibits a specific capacity of 216.4 mAh g −1 and a capacity retention of 75 % after 2000 cycles. Even at a high current density of 5 A g −1 , the capacity can still retain 87 % of that under 1 A g −1 . It is demonstrated that the electrochemical performance of NiCo 2 S 4 can be effectively boosted by combining with conductive CNTs.