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Issue 33, 2019
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Nitrogen-doped hollow carbon nanospheres towards the application of potassium ion storage

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Abstract

Carbon-based materials have triggered significant attention in potassium ion storage as a low-cost and abundant resource. However, the critical step for the commercial application lies in developing environmentally friendly carbon-based materials with high rate capability and long cycling stability as well as promising full-cell performances. Here, nitrogen-doped hollow carbon nanospheres (N-HCNs) were synthesized by nontoxic dopamine as the carbon and simultaneous nitrogen-doping source, exhibiting excellent K+ storage performances with a reversible storage capacity of 154 mA h g−1 at a high current density of 1.0 A g−1 upon 2500 cycles. Moreover, the N-HCNs were successfully assembled in a full-cell battery with TiS2 as the cathode and exhibited high reversible specific capacity, reaching 100 mA h g−1 at 0.1 A g−1 upon 40 cycles. Such a superior K+ storage performance was attributed to the unique structure of the N-HCNs, in which the hierarchical pores facilitated the impregnation of the electrolyte, the hollow structure alleviated the volume expansion, and the doped N atoms increased the conductivity of carbon. Furthermore, detailed electrochemical kinetic calculations manifested that the K+ ion storage in N-HCNs was due to a pseudocapacitive mechanism. The simple synthesis route combined with the remarkable electrochemical performance provides a new insight into green carbon-based anode materials for K+ ion storage with high energy and a long cycling life.

Graphical abstract: Nitrogen-doped hollow carbon nanospheres towards the application of potassium ion storage

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Publication details

The article was received on 17 May 2019, accepted on 22 Jul 2019 and first published on 23 Jul 2019


Article type: Paper
DOI: 10.1039/C9TA05205D
J. Mater. Chem. A, 2019,7, 19305-19315

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    Nitrogen-doped hollow carbon nanospheres towards the application of potassium ion storage

    J. Ruan, X. Wu, Y. Wang, S. Zheng, D. Sun, Y. Song and M. Chen, J. Mater. Chem. A, 2019, 7, 19305
    DOI: 10.1039/C9TA05205D

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