Sulfur Nanoparticle-Decorated Nickel Cobalt Sulfide Hetero-Nanostructures with Enhanced Energy Storage for High-Performance Supercapacitorsopen access
- Authors
- Kumar, Yedluri Anil; Yadav, Anuja A.; Al-Asbahi, Bandar Ali; Kang, Seok-Won; Moniruzzaman, Md
- Issue Date
- Nov-2022
- Publisher
- MDPI
- Keywords
- NiCo2S4; sulfur nanoparticle; electrode materials; supercapacitor; energy storage performance
- Citation
- MOLECULES, v.27, no.21
- Journal Title
- MOLECULES
- Volume
- 27
- Number
- 21
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/86273
- DOI
- 10.3390/molecules27217458
- ISSN
- 1420-3049
- Abstract
- Transition-metal sulfides exaggerate higher theoretical capacities and were considered a type of prospective nanomaterials for energy storage; their inherent weaker conductivities and lower electrochemical active sites limited the commercial applications of the electrodes. The sheet-like nickel cobalt sulfide nanoparticles with richer sulfur vacancies were fabricated by a two-step hydrothermal technique. The sheet-like nanoparticles self-combination by ultrathin nanoparticles brought active electrodes entirely contacted with the electrolytes, benefiting ion diffusion and charges/discharges. Nevertheless, defect engineers of sulfur vacancy at the atomic level raise the intrinsic conductivities and improve the active sites for energy storage functions. As a result, the gained sulfur-deficient NiCo2S4 nanosheets consist of good specific capacitances of 971 F g(-1) at 2 A g(-1) and an excellent cycle span, retaining 88.7% of the initial capacitance over 3500 cyclings. Moreover, the values of capacitance results exhibited that the fulfilling characteristic of the sample was a combination of the hydrothermal procedure and the surface capacitances behavior. This novel investigation proposes a new perspective to importantly improve the electrochemical performances of the electrode by the absolute engineering of defects and morphologies in the supercapacitor field.
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