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

Gi Dae Park, Yun Chan Kang

Research output: Contribution to journalArticle

16 Citations (Scopus)

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%.

Original languageEnglish
Pages (from-to)8125-8132
Number of pages8
JournalNanoscale
Volume10
Issue number17
DOIs
Publication statusPublished - 2018 May 7

ASJC Scopus subject areas

  • Materials Science(all)

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