期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 824, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2020.153937
关键词
Co3S4; NiCo LDH; Carbon nanotube (CNT); Battery-type; Hybrid supercapacitors
资金
- Foundation for Innovation Team of Bioanalytical Chemistry
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 (CHT)/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 individualCo(3)S(4) 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. (C) 2020 Elsevier B.V. All rights reserved.
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