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

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

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
Volume17
Issue number47
DOIs
Publication statusPublished - 2015 Jan 1

Fingerprint

cobalt oxides
Spray pyrolysis
Electrochemical properties
pyrolysis
sprayers
hollow
Salts
Metals
salts
synthesis
Oxides
metal oxides
Powders
metals
ion storage
composite materials
washing
Composite materials
Atmosphere
Lithium

ASJC Scopus subject areas

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

Cite this

Synthesis of hollow cobalt oxide nanopowders by a salt-assisted spray pyrolysis process applying nanoscale Kirkendall diffusion and their electrochemical properties. / Ju, Hyeon Seok; Cho, Jung Sang; Kim, Jong Hwa; Choi, Yun Ju; Kang, Yun Chan.

In: Physical Chemistry Chemical Physics, Vol. 17, No. 47, 01.01.2015, p. 31988-31994.

Research output: Contribution to journalArticle

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