Issue 30, 2025, Issue in Progress

Fabrication and electrochemical study of copper doped zinc sulfide/graphene nanocomposites for supercapacitors

Abstract

Transition metal sulfides exhibit excellent electrochemical performance and electrochemical energy storage capacity. Herein, we present high-capacity supercapacitor electrode based on copper doped zinc sulfide/graphene (ZCG) synthesized by co-precipitation method. Various techniques have been employed to characterize the ZCG nanocomposite including electrochemical measurements. The ZCG nanocomposites exhibit high crystallinity and phase purity. In three-electrode system and 1 M aqueous KOH solution, the prepared ZCG electrodes are evaluated using galvanostatic charge–discharge cycles (GCD), cyclic voltammetry (CV), and electrochemical impedance spectroscopy (EIS). The ZCG electrode exhibits an ultrahigh specific capacitance of 2295 F g−1 at a relatively low scan rate of 5 mV s−1 from CV and 743 F g−1 at 100 A g−1 from GCD, with exceptional cycling stability (93% capacity retention after 1000 cycles). Furthermore, the ZCG10 symmetric coin cell exhibits a specific capacitance, energy density, power density of 130.8 F g−1, 18 W h kg−1, 2400 W kg−1 at current density of 1.2 A g−1 in a 1 M KOH solution from GCD. The ZCG hybrid electrode material can be predicted a potential hybrid electrode material for the future development of energy storage devices.

Graphical abstract: Fabrication and electrochemical study of copper doped zinc sulfide/graphene nanocomposites for supercapacitors

Supplementary files

Article information

Article type
Paper
Submitted
10 Mar 2025
Accepted
01 Jul 2025
First published
11 Jul 2025
This article is Open Access
Creative Commons BY license

RSC Adv., 2025,15, 24331-24349

Fabrication and electrochemical study of copper doped zinc sulfide/graphene nanocomposites for supercapacitors

S. Saleem, S. Khalid, A. Nazir, Y. Khan, I. Ahmad and Rameesha, RSC Adv., 2025, 15, 24331 DOI: 10.1039/D5RA01710F

This article is licensed under a Creative Commons Attribution 3.0 Unported Licence. You can use material from this article in other publications without requesting further permissions from the RSC, provided that the correct acknowledgement is given.

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