This study demonstrates how (Ni–Co–S)–reduced graphene oxide (rGO) heterostructure films influence the pseudocapacitance behavior of MoS2 nanoflakes. rGO was produced through the electroreduction of CO2 intermediates. The ordering of the heterostructure layers considerably impacted the morphology and interfacial bonding between the (Ni–Co–S)–rGO layers and MoS2 nanoflakes. Electrodeposited (NiS/CoS)–rGO/MoS2 and (CoS/NiS)–rGO/MoS2 layers, prepared in two successive steps, exhibited a porous nanoplatelet structure, whereas the NiCoS–rGO/MoS2 layers deposited in a single step formed dense nanocomposite (NC) films. X-ray photoelectron spectroscopy and Raman spectroscopy confirmed the presence of various surface bonding states (C–O/=O, S=O/–O, Ni/Co–S) between MoS2 nanoflakes and (Ni–Co–S)–rGO layers, highlighting the development of synergy through diverse interfacial bonding states. Tailoring the nanoarchitecture of heterostructure layers led to variations in the electroactive site concentrations and charge transport kinetics. The (CoS/NiS)–rGO/MoS2 nanoplatelets exhibited the highest specific capacitance of 3530.72 F∙g−1 at 1 A∙g−1, surpassing the (NiS/CoS)–rGO/MoS2 nanoplatelets (3096.69 F∙g−1) and NiCoS–rGO/MoS2 NCs (2907.71 F∙g−1). Asymmetric hybrid supercapacitors were assembled using the heterostructure (Ni–Co–S)–rGO/MoS2 NCs and activated carbon (AC). The (CoS/NiS)–rGO/MoS2 nanoplatelets//AC asymmetric supercapacitor achieved the highest energy density (E) of 26.69 Wh∙kg−1 at a power density (P) of 302.7 W∙kg−1, outperforming other heterostructure supercapacitors, and maintained an E of 9.36 Wh∙kg−1 at a higher P of 2593.32 W∙kg−1. The results illustrated that the in-situ formation of rGO species and the heterostructure layer configurations strongly influenced the pseudocapacitance performance of (Ni–Co–S)–rGO/MoS2 hybrid electrodes.
Research Abstract
Research Date
Research Department
Research Journal
journal of Alloys and Compounds
Research Member
Research Publisher
Elsevier
Research Rank
International Journal
Research Vol
1011
Research Website
https://doi.org/10.1016/j.jallcom.2025.178449
Research Year
2025
Research Pages
178449