Superior Electrochemical Properties of Nanofibers Composed of Hollow CoFe2O4 Nanospheres Covered with Onion-Like Graphitic Carbon

Young Jun Hong, Jung Sang Cho, Yun Chan Kang

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

Nanofibers composed of hollow CoFe2O4 nanospheres covered with onion-like carbon are prepared by applying nanoscale Kirkendall diffusion to the electrospinning process. Amorphous carbon nanofibers embedded with CoFe2@onion-like carbon nanospheres are prepared by reduction of the electrospun nanofibers. Oxidation of the CoFe2-C nanofibers at 300°C under a normal atmosphere produces porous nanofibers composed of hollow CoFe2O4 nanospheres covered with onion-like carbon. CoFe2 nanocrystals are transformed into the hollow CoFe2O4 nanospheres during oxidation through a well-known nanoscale Kirkendall diffusion process. The discharge capacities of the carbon-free CoFe2O4 nanofibers composed of hollow nanospheres and the nanofibers composed of hollow CoFe2O4 nanospheres covered with onion-like carbon are 340 and 930 mA h g-1, respectively, for the 1000th cycle at a current density of 1 g-1. The nanofibers composed of hollow CoFe2O4 nanospheres covered with onion-like carbon exhibit an excellent rate performance even in the absence of conductive materials.

Original languageEnglish
Pages (from-to)18202-18208
Number of pages7
JournalChemistry - A European Journal
Volume21
Issue number50
DOIs
Publication statusPublished - 2015 Dec 7

Keywords

  • energy storage materials
  • hollow nanospheres
  • nanostructures
  • onion-like carbon
  • synthesis design

ASJC Scopus subject areas

  • Catalysis
  • Organic Chemistry

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