Designing of NiO/NiS₂@ nitrogen-doped carbon for high-performance hybrid supercapacitor

Borg, Omnya Mostafa; Kospa, Doaa Ahmed; Gebril, Ahmed; Ibrahim, Amr Awad

doi:10.21608/mjcc.2025.425515.1032

Designing of NiO/NiS₂@ nitrogen-doped carbon for high-performance hybrid supercapacitor

Document Type : Research Article

Authors

¹ Mansour University

² Department of Chemistry, Faculty of Science, Mansoura University,

³ Nile Higher Institutes of Engineering and Technology, El-Mansoura, Egypt

⁴ Chemistry Department, Faculty of science, Mansoura University)

10.21608/mjcc.2025.425515.1032

Abstract

High-performance energy storage devices are required as consumer electronics, electric vehicles, and smart meters grow at a rapid pace. Supercapacitors are currently considered one of the highly promising energy devices for upcoming energy technologies. Herein, NiO/NiS₂@nitrogen doped carbon composite was used as a hybrid supercapacitor electrode. Several techniques, including scanning electron microscopy (SEM) and transmission electron microscopy (TEM), were applied to evaluate the interfacial properties and structure of the as-synthesized NiO/NiS₂@NC.Moreover, X-ray diffraction (XRD) confirmed the synthesis of NiO and NiS₂ crystalline phases with a distinct carbon peak at 2θ=23° that revealed the formation of NiO/NiS₂ over N-doped carbon. Interestingly, the synergetic interaction between NiS2 and NiO enhances conductivity and electrochemical performance, while nitrogen-doped carbon significantly boosts surface area and specific capacitance. The electrochemical characteristics were thoroughly investigated in a 3 M KOH solution by using the techniques of cyclic voltammetry (CV) and the galvanostatic charge-discharge (GCD) approach. NiO/NiS₂@NC has enhanced electrochemical performance, obtaining a specific capacitance of 1134 F g⁻¹ at 1 A g⁻¹, whereas NC reaches 369 F g⁻¹ under comparable current density conditions.

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