核壳 NiCo₂S₄@C 超级电容器电极材料的制备及性能

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Preparation and performance for core-shell NiCo2S4@C supercapacitor electrodematerials

SHIGuimei，BAI Wenbin （School of Science，ShenyangUniversityof Technology，Shenyang1lo87o，China）

Abstract： The electrode materials of NiCo2S4@C supercapacitor with core-shell structure were prepared by a combination of direct current arc plasma method and hydrothermal vulcanisation method. The physical phase，morphology，surface composition and electrochemical energy storage properties of the NiCo2S4@C nanocapsules with core-shell structure were investigated by X-ray diffraction， transmisson electron microscopy and X-ray photoelectron spectroscopy，as well as by electrochemical workstation. The results show that NiCo2S4@C exhibits an obvious core-shell structure，and the graphitic carbon uniformly coats the surface of NiCo2S4 nanorods，which inhibits the particle agglomeration，the specific capacitance of NiCo2S4@C is 1558.8F/g at a current densityof 1Ag-1 ，and the cycling stability can be maintained at 9O.1%（ 10Ag-1 ）after5000 cycles.Due to the good mechanical stabilityand electrical conductivity of graphitic carbon，the coreshell structured NiCo2S4@C has higher specific capacitance and cycling stability compared to NiCo2S4 without graphitic carbon layer coating. The synergistic effect of NiCo2S4 core and graphite carbon shellstructure improves the active site and specific surface area per unit volume，provides high-speed ion transport channels for the redox reaction process，and enhances the electrochemical performance of NiCo2S4@C supercapacitor electrode materials.

Key words： supercapacitors； NiCo2S4 ； arc-discharge method；core-shell structure；alkalineaqueous capacitor

可持续清洁能源的研究是当下的热点。（剩余9085字）