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Carbon-coated mesoporous Co9S8 nanoparticles supported on reduced graphene oxide (rGO) are successfully synthesized by a simple process. This composite makes full use of the protection of the carbon layer on the surface, the good conductivity and three-dimensional (3D) structure of rGO, the mesoporous structure and nanoscale size of Co9S8, thereby presenting the excellent electrochemical performances in potassium-ion batteries, 407.9 mAh·g-1 after 100 cycles at 0.2 A·g-1 and 215.1 mAh·g-1 at 5 A·g-1 in rate performances. After 1,200 cycles at 1.0 A·g-1, this composite still remains a capacity of 210.8 mAh·g-1. The redox reactions for potassium storage are revealed by ex-situ transmission electron microscope (TEM)/high-resolution TEM (HRTEM) images, selected area electron diffraction (SAED) patterns and X-ray photoelectron spectroscopy (XPS) spectra. The application of this composite as the host of sulfur for Li-S batteries is also explored. It sustains a capacity of 431.8 mAh·g-1 after 800 cycles at 3 C, leading to a degradation of 0.052% per cycle. These results confirm the wide applications of this composite for electrochemical energy storage.

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Publication history
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Acknowledgements

Publication history

Received: 30 November 2019
Revised: 27 January 2020
Accepted: 04 February 2020
Published: 28 February 2020
Issue date: March 2020

Copyright

© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2020

Acknowledgements

Thank the financial support from Science, Technology and Innovation Commission of ShenZhen Municipality (No. JCYJ20180305164424922), Fundamental Research Funds of Shandong University (No. 2018JC023), the National Nature Science Foundation of China (Nos. 61527809, 21471090, and 21971146), Taishan Scholarship in Shandong Provinces (No. ts201511004), and Development Programs of Shandong Province (Nos. 2017GGX40101 and 2017CXGC0503).

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