Issue 5, 2023

Controlling the electrochemical activity of dahlia-like β-NiS@rGO by interface polarization

Abstract

Transition metal sulfides have become more and more important in the field of energy storage due to their superior chemical and physical properties. Herein, dahlia β-NiS with a rough surface and β-NiS@reduced graphene oxide (rGO) have been green synthesized by a one-step hydrothermal method. The interface characteristics of β-NiS@ rGO composites have been systematically studied by XPS, Raman, and first-principles calculations. It is found that the residual O atoms in the interface and the polarization charge generated by them play an important role in performance enhancement. The NiS@rGO composite material has the best electrochemical performance when the C/O ratio is 6.48. Furthermore, we designed a NiS@rGO//rGO asymmetric supercapacitor with a potential window of 1.7 V. Its excellent energy density and power density demonstrate the advantages of the optimized NiS@rGO electrode. When the power density is 850 W kg−1, the energy density can reach 40.4 W h kg−1. Even at a power density of up to 6800 W kg−1, the energy density can be maintained at 17.6 W h kg−1. These encouraging results provide a possible pathway for designing asymmetric supercapacitors with ultra-high performance and a feasible strategy for the precise control of electrochemical performance.

Graphical abstract: Controlling the electrochemical activity of dahlia-like β-NiS@rGO by interface polarization

Supplementary files

Article information

Article type
Paper
Submitted
29 Sep 2022
Accepted
28 Dec 2022
First published
29 Dec 2022

Dalton Trans., 2023,52, 1345-1356

Controlling the electrochemical activity of dahlia-like β-NiS@rGO by interface polarization

Y. Wei, X. Zou, C. Cen, B. Zhang, B. Xiang, J. Hao, B. Wang, M. Deng, Q. Hu and S. Wei, Dalton Trans., 2023, 52, 1345 DOI: 10.1039/D2DT03167A

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