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Issue 39, 2018
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N-Rich carbon-coated Co3S4 ultrafine nanocrystals derived from ZIF-67 as an advanced anode for sodium-ion batteries

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Abstract

Transition metal sulfides (TMSs) have been extensively studied as electrode materials for sodium-ion batteries by virtue of their high theoretical capacity. However, the poor cyclability limits the practical application of TMSs in sodium ion batteries. In this study, N-rich carbon-coated Co3S4 ultrafine nanocrystal (Co3S4@NC) was prepared by utilizing ZIF-67 as a precursor through continuous carbonization and sulfuration processes, exhibiting ultrafine nanocrystals with a diameter of about 5 nm. When utilized as the anode for sodium ion batteries, the nanohybrid material exhibits remarkable cycling performance with a high specific capacity of 420.9 mA h g−1 at the current density of 100 mA g−1 after 100 cycles, indicating that the cycling performance is strengthened by the nitrogen-doped carbon coating. Impressively, the obtained material shows good rate performances with reversible specific capacities of 386.7, 284.0, and 151.2 mA h g−1 at 400, 1000, and 1400 mA g−1, respectively, due to the high surface-capacitance contribution and porous structure inherited from the precursor, which finally results in the increase in infiltration of electrolyte and the accelerating diffusion rate of Na+. This study sheds light on the routes to improve the performance of TMSs@nitrogen-doped carbon nanohybrid materials for sodium ion batteries.

Graphical abstract: N-Rich carbon-coated Co3S4 ultrafine nanocrystals derived from ZIF-67 as an advanced anode for sodium-ion batteries

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Publication details

The article was received on 13 Jul 2018, accepted on 18 Sep 2018 and first published on 19 Sep 2018


Article type: Paper
DOI: 10.1039/C8NR05652H
Citation: Nanoscale, 2018,10, 18786-18794

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    N-Rich carbon-coated Co3S4 ultrafine nanocrystals derived from ZIF-67 as an advanced anode for sodium-ion batteries

    Y. Jiang, G. Zou, W. Hong, Y. Zhang, Y. Zhang, H. Shuai, W. Xu, H. Hou and X. Ji, Nanoscale, 2018, 10, 18786
    DOI: 10.1039/C8NR05652H

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