Issue 27, 2021

Carbon nanocoils decorated with a porous NiCo2O4 nanosheet array as a highly efficient electrode for supercapacitors

Abstract

Well-organized substrate materials are of considerable significance in the development of energy-efficient pseudocapacitor electrodes. Herein, functionalized three-dimensional (3D) carbon nanocoils on nickel foam (CNCs/NF) have been used as the substrate to grow faradaic nickel cobaltite (NiCo2O4) via a solvothermal method. The arrays of NiCo2O4 were assembled by interconnected ultrathin nanosheets with random inter-particle pores. The number of electroactive sites increased specifically because of the porous feature of NiCo2O4 nanosheets and the 3D structure of CNCs/NF. Moreover, the CNCs/NF network aided the electrolyte ions in diffusing deeply within the architecture. The NiCo2O4/CNCs/NF composite exhibited an outstanding specific capacitance of 2821 F g−1 at the current density of 1 A g−1, a remarkable rate capability (82.4%) and long cyclic stability (91.7% after 3000 cycles). Such encouraging electrochemical performance was attributed mainly to the synergistic interactions of NiCo2O4 arrays and CNCs/NF substrate that helped achieve efficient redox reactions, enhanced ion diffusivity and excellent electron conductivity. In summary, this binder-free NiCo2O4/CNCs/NF composite electrode paves a way towards the synthesis of highly efficacious electrodes for supercapacitors.

Graphical abstract: Carbon nanocoils decorated with a porous NiCo2O4 nanosheet array as a highly efficient electrode for supercapacitors

Supplementary files

Article information

Article type
Paper
Submitted
11 Feb 2021
Accepted
15 Jun 2021
First published
19 Jun 2021

Nanoscale, 2021,13, 11943-11952

Carbon nanocoils decorated with a porous NiCo2O4 nanosheet array as a highly efficient electrode for supercapacitors

A. S. Khan, L. Pan, A. Farid, M. Javid, H. Huang and Y. Zhao, Nanoscale, 2021, 13, 11943 DOI: 10.1039/D1NR00949D

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