Hollow Cobalt Selenide Microspheres: Synthesis and Application as Anode Materials for Na-Ion Batteries

You Na Ko, Seung Ho Choi, Yun Chan Kang

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70 Citations (Scopus)


The electrochemical properties of hollow cobalt oxide and cobalt selenide microspheres are studied for the first time as anode materials for Na-ion batteries. Hollow cobalt oxide microspheres prepared by one-pot spray pyrolysis are transformed into hollow cobalt selenide microspheres by a simple selenization process using hydrogen selenide gas. Ultrafine nanocrystals of Co3O4 microspheres are preserved in the cobalt selenide microspheres selenized at 300 °C. The initial discharge capacities for the Co3O4 and cobalt selenide microspheres selenized at 300 and 400 °C are 727, 595, and 586 mA h g-1, respectively, at a current density of 500 mA g-1. The discharge capacities after 40 cycles for the same samples are 348, 467, and 251 mA h g-1, respectively, and their capacity retentions measured from the second cycle onward are 66, 91, and 50%, respectively. The hollow cobalt selenide microspheres have better rate performances than the hollow cobalt oxide microspheres.

Original languageEnglish
Pages (from-to)6449-6456
Number of pages8
JournalACS Applied Materials and Interfaces
Issue number10
Publication statusPublished - 2016 Mar 16



  • cobalt oxide
  • cobalt selenide
  • energy storage
  • Na-ion battery
  • nanostructure

ASJC Scopus subject areas

  • Materials Science(all)

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