Issue 37, 2019

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

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

Supplementary files

Article information

Article type
Paper
Submitted
12 Jun 2019
Accepted
27 Aug 2019
First published
27 Aug 2019

J. Mater. Chem. A, 2019,7, 21404-21409

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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