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Multiroom-structured multicomponent metal selenide–graphitic carbon–carbon nanotube hybrid microspheres as efficient anode materials for sodium-ion batteries

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Abstract

Novel three-dimensional (3D) multiroom-structured multicomponent metal (NiFe) selenide–graphitic carbon (GC)–carbon nanotube (CNT) hybrid microspheres were prepared by spray pyrolysis and a subsequent selenization process. Phase segregation and the decomposition of dextrin resulted in multiroom-structured microspheres with uniformly distributed empty nanovoids in the spray pyrolysis process. Metal nanocrystals of iron and nickel components that formed as intermediate products during the selenization process transformed amorphous carbon into GC by acting as nanocatalysts. GC layers surrounding (NiFe)Sex nanocrystals and CNTs uniformly skeletonized in multiroom-structured microspheres improved the electrical conductivity and structural stability. Due to the synergistic effect of the unique structure and conductivity of the carbon components, the multiroom-structured (NiFe)Sex–GC–CNT hybrid microsphere showed excellent cycling and rate performance for sodium-ion storage. The discharge capacities of (NiFe)Sex–GC, (NiFe)Sex–CNT, and (NiFe)Sex–GC–CNT for the 100th cycle at a current density of 0.3 A g−1 were 369, 284, and 455 mA h g−1, respectively, and the respective capacity retentions measured from the second cycle were 74.1, 56.1, and 92.2%.

Graphical abstract: Multiroom-structured multicomponent metal selenide–graphitic carbon–carbon nanotube hybrid microspheres as efficient anode materials for sodium-ion batteries

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Publication details

The article was received on 14 Mar 2018, accepted on 19 Mar 2018 and first published on 21 Mar 2018


Article type: Paper
DOI: 10.1039/C8NR02119H
Citation: Nanoscale, 2018, Advance Article
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    Multiroom-structured multicomponent metal selenide–graphitic carbon–carbon nanotube hybrid microspheres as efficient anode materials for sodium-ion batteries

    G. D. Park and Y. C. Kang, Nanoscale, 2018, Advance Article , DOI: 10.1039/C8NR02119H

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