CNT/Co3S4@NiCo LDH ternary nanocomposites as battery-type electrode materials for hybrid supercapacitors

Dandan Wei,Youliang Zhang,Xuezhen Zhu,Fan Mingli,Yinling Wang

Published 2020 in Journal of Alloys and Compounds

ABSTRACT

Abstract Hybrid supercapacitors with high energy density and power density have been greatly required for electronic devices. However, the development of the battery-type electrode materials with high performance is still a challenge. In this study, a ternary carbon nanotube (CNT)/Co3S4 @NiCo layered double hydroxides (NiCo LDH) nanocomposite has been prepared by first synthesis of hollow and core-shell Co3S4 @NiCo LDH nanocubes and then mixing them physically with commercial CNT. The electrochemical studies show that the specific capacity of Co3S4 @NiCo LDH is superior to that of individual Co3S4 or NiCo LDH due to their synergistic effect and CNT can remarkably improve the specific capacity of Co3S4 @NiCo LDH. At the optimum mass ratio of 3:10, the specific capacity of CNT/Co3S4 @NiCo LDH at 1 A g −1 can be up to 744 C g −1 (or 206.7 mAh g−1), about 1.8 times that of Co3S4 @NiCo LDH. In addition, a hybrid supercapacitor using Co3S4 @NiCo LDH or CNT/Co3S4 @NiCo LDH as the positive electrode and active carbon (AC) as the negative electrode was assembled. The performance of Co3S4 @NiCo LDH//AC, CNT/Co3S4 @NiCo LDH//AC and two CNT/Co3S4 @NiCo LDH//AC in series was investigated, displaying good practicability as the energy storage and supply devices. This work provides not only a highly efficient battery-type electrode material but also an easy and effective method to fabricate ternary electrode materials.

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