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Issue 37, 2019
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Carbon-coated CoSe2 nanoparticles confined in N-doped carbon microboxes with enhanced sodium storage properties

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Abstract

Due to their high theoretical specific capacity, CoSe2-based anode materials have attracted enormous attention for sodium storage. However, the poor cycling stability and rate capability still hinder their application. Herein, starting from Co3[Co(CN)6]2 Prussian blue analogue microcubes, a facile template-engaged strategy is developed to design and synthesize nanostructured dual-carbon-confined CoSe2 (denoted as DCC-CoSe2) microcubes. In this unique nanostructure, N-doped carbon-coated CoSe2 nanoparticles are confined in N-doped carbon microboxes. Benefiting from the desired structural features, the as-synthesized DCC-CoSe2 microcubes exhibit enhanced sodium storage properties in terms of high specific capacity (480 mA h g−1), excellent cycling stability (94.5% capacity retention over 2000 cycles), and superior rate capability (281 mA h g−1 at 20 A g−1). The assembled full cell with DCC-CoSe2 microcubes as the anode material and Na3V2(PO4)3 as the cathode material can deliver a high initial capacity of 427 mA h g−1. This work provides a new strategy for the rational design and synthesis of high performance metal selenide-based anode materials for sodium storage.

Graphical abstract: Carbon-coated CoSe2 nanoparticles confined in N-doped carbon microboxes with enhanced sodium storage properties

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Supplementary files

Article information


Submitted
12 Jun 2019
Accepted
27 Aug 2019
First published
27 Aug 2019

J. Mater. Chem. A, 2019,7, 21404-21409
Article type
Paper

Carbon-coated CoSe2 nanoparticles confined in N-doped carbon microboxes with enhanced sodium storage properties

J. Tian, J. Li, Y. Zhang, X. Yu and Z. Hong, J. Mater. Chem. A, 2019, 7, 21404
DOI: 10.1039/C9TA06273D

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