Li W, Song W, Wang H, Kang YM. In situ self-assembly of Ni3S2/MnS/CuS/reduced graphene composite on nickel foam for high power supercapacitors.
RSC Adv 2019;
9:31532-31542. [PMID:
35527970 PMCID:
PMC9072588 DOI:
10.1039/c9ra05435a]
[Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2019] [Accepted: 09/17/2019] [Indexed: 01/09/2023] Open
Abstract
Transition metal sulfides (TMS), as promising electroactive materials for asymmetric supercapacitors, have been limited due to their relatively poor conductivity and cycle stability. Here ternary Ni3S2/MnS/CuS composites were assembled in situ on nickel foam (NF) using a hydrothermal method via electrostatic adsorption of Ni+, Mn2+ and Cu2+ ions on a reduced graphene (rGO) nanosheet template. The chemical structure was characterized by various analytic methods. Ni3S2/MnS/CuS has spherical morphology assembled from closely packed nanosheets, while Ni3S2/MnS/CuS@rGO has a three-dimensional porous spherical structure with much lower diameter because rGO nanosheets can play the role of a template to induce the growth of Ni3S2/MnS/CuS. At a current density of 1 A g−1, the specific capacitance was obtained to be 1028 F g−1 for Ni3S2/MnS/CuS, 628.6 F g−1 for Ni3S2/MnS@rGO, and 2042 F g−1 for Ni3S2/MnS/CuS@rGO, respectively. Charge transfer resistance (Rct) of Ni3S2/MnS/CuS@rGO (0.001 Ω) was much lower than that of Ni3S2/MnS@rGO by 0.02 Ω, and lower than that of Ni3S2/MnS/CuS by 0.017 Ω. After 5000 cycles, the Ni3S2–MnS–CuS@RGO electrode maintains 78.3% of the initial capacity at 20 A g−1. An asymmetric supercapacitor was subsequently assembled using Ni3S2/MnS/CuS@rGO as the positive electrode and rGO as the negative electrode. The specific capacitance of asymmetric batteries was maintained at 90.8% of the initial state after 5000 GCD.
Transition metal sulfides (TMS), as promising electroactive materials for asymmetric supercapacitors, have been limited due to their relatively poor conductivity and cycle stability.![]()
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