Synthesis of hollow cobalt oxide nanopowders by a salt-assisted spray pyrolysis process applying nanoscale Kirkendall diffusion and their electrochemical properties

Hyeon Seok Ju, Jung Sang Cho, Jong Hwa Kim, Yun Ju Choi, Yun Chan Kang

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7 Citations (Scopus)


A new concept for preparing hollow metal oxide nanopowders by salt-assisted spray pyrolysis applying nanoscale Kirkendall diffusion is introduced. The composite powders of metal oxide and indecomposable metal salt are prepared by spray pyrolysis. Post-treatment under a reducing atmosphere and subsequent washing using distilled water produce aggregation-free metal nanopowders. The metal nanopowders are then transformed into metal oxide hollow nanopowders by nanoscale Kirkendall diffusion. Co 3 O 4 hollow nanopowders are prepared as first target materials. A cobalt oxide-NaCl composite powder prepared by spray pyrolysis transforms into several Co 3 O 4 hollow nanopowders by several treatment processes. The discharge capacities of the Co 3 O 4 nanopowders with filled and hollow structures at a current density of 1 A g -1 for the 150th cycle are 605 and 775 mA h g -1 , respectively. The hollow structure formed by nanoscale Kirkendall diffusion improves the lithium-ion storage properties of Co 3 O 4 nanopowders.

Original languageEnglish
Pages (from-to)31988-31994
Number of pages7
JournalPhysical Chemistry Chemical Physics
Issue number47
Publication statusPublished - 2015 Jan 1


ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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