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A promising mechanical ball-milling method to synthesize carbon-coated Co9S8 nanoparticles as high-performance electrode for supercapacitor

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Abstract

A Co9S8/C nanocomposite has been prepared using a solid-state reaction followed by a facile mechanical ball-milling treatment with sucrose as the carbon source. The phases, morphology, and detailed structures of Co9S8/C nanocomposite are well characterized by X-ray diffraction, X-ray photoelectron spectroscopy, and high-resolution transmission electron microscopy. Our experimental results show that not only a process of particle size reduction, the ball-milling treatment also promotes the carbon and Co9S8 combining with each other more effectively to form an ultrafine nanocomposite. When used as an electrode material in supercapacitor, Co9S8/C nanocomposite exhibits a high initial specific capacitance of 756.2 F g−1 at 1 A g−1 and excellent cycling stability with 73.4% retention after 2000 cycles. Its outstanding electrochemical properties are mainly attributed to the nanosize of particles and amorphous carbon layer coating on its surface.

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Acknowledgements

This work was funded by NSFC Grant (No. 51372089) supported through NSFC Committee of China.

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Author notes

  1. Yanming Zhao

    Present address: State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou, 510640, People’s Republic of China

Authors and Affiliations

  1. School of Material Science and Engineering, South China University of Technology, Guangzhou, People’s Republic of China

    Xudong Liu & Qidong Li

  2. School of Physics, South China University of Technology, Guangzhou, 510640, People’s Republic of China

    Yanming Zhao, Youzhong Dong, Qinghua Fan & Quan Kuang

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  1. Xudong Liu
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Correspondence to Yanming Zhao.

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Liu, X., Li, Q., Zhao, Y. et al. A promising mechanical ball-milling method to synthesize carbon-coated Co9S8 nanoparticles as high-performance electrode for supercapacitor. J Mater Sci 52, 13552–13560 (2017). https://doi.org/10.1007/s10853-017-1373-2

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