Abstract
Metal sulfides, such as NiCo-sulfides, have attracted tremendous attention from the view of high conductivities and electrochemical activities. However, their structure degradation during the redox process causes cycling instability, which results in the limitation of the application of metal sulfides. Herein, we study the combination of metal sulfides with carbonaceous materials. The NHCS/Ni2CoS4 composite is synthesized via a facile two-step method that entails first the fabrication of the N-doped hollow carbon spheres (NHCS) followed by the loading of Ni2CoS4 nanocubes into the NHCS via hydrothermal synthesis. The as-obtained NHCS/Ni2CoS4 composite electrode shows a super electrochemical performance (1465 F g−1 at 0.5 A g−1) and has a satisfactory cycling stability (87.4% capacitance retention). These results indicate that NHCS/Ni2CoS4 is a promising electrode material for high-performance supercapacitors.
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Acknowledgements
We gratefully acknowledge the financial support of this research by Scientific Research Fund of Hunan Provincial Education Department (Nos. 19C0765 and 19C0764), National Natural Science Foundation of China (21875062) and the Research and Development Planning Projects in Key Areas of Hunan Province (No. 2019GK2034).
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Chen, Y., Ouyang, T., **ang, K. et al. Ni2CoS4 nanocubes anchored on nitrogen-doped ultra-thin hollow carbon spheres to achieve high-performance supercapacitor. Ionics 28, 415–422 (2022). https://doi.org/10.1007/s11581-021-04288-3
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DOI: https://doi.org/10.1007/s11581-021-04288-3