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Metal-organic framework-derived CoSe2/(NiCo)Se2 box-in-box hollow nanocubes with enhanced electrochemical properties for sodium-ion storage and hydrogen evolution

Abstract

Multishell structured metal selenide nanocubes, namely, Co/(NiCo)Se2 box-in-box structures with different shell compositions, were successfully synthesized by applying zeolitic imidazolate framework-67 (ZIF-67) as a template. This strategy involved the fabrication of cube-shaped ZIF-67/Ni-Co layered double hydroxides with yolk-shelled structure and then transformation into the Co/(NiCo)Se2 with box-in-box structure by a selenization process under Ar/H2 condition. During the selenization step, hollow structured CoSe2 cores were generated by Ostwald ripening, resulting in the formation of Co/(NiCo)Se2 with box-in-box structure composed of inner CoSe2 shell and outer (NiCo)Se2 shell. Due to the synergetic effect of the unique structure and multicomponent selenide composition, the Co/(NiCo)Se2 with box-in-box structure offered excellent dual functionality as both an anode for sodium ion batteries (SIBs) and an electrocatalyst for the hydrogen evolution reaction (HER). Electrochemical tests on the Co/(NiCo)Se2 with box-in-box structure demonstrated a low Tafel slope (39.8 mV dec-1) and excellent stability. In addition, it delivered a high specific capacity of 497 mA h g-1 after 80 cycles, with a current density of 0.2 A g-1 and excellent cycling stability as anode materials for SIBs.

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Publication details

The article was received on 27 Jun 2017, accepted on 11 Aug 2017 and first published on 11 Aug 2017


Article type: Paper
DOI: 10.1039/C7TA05571D
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    Metal-organic framework-derived CoSe2/(NiCo)Se2 box-in-box hollow nanocubes with enhanced electrochemical properties for sodium-ion storage and hydrogen evolution

    S. Park, J. K. Kim and Y. C. Kang, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA05571D

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