Superior Electrochemical Properties of Nanofibers Composed of Hollow CoFe2O4 Nanospheres Covered with Onion-Like Graphitic Carbon
- Authors
- Hong, Young Jun; Cho, Jung Sang; Kang, Yun Chan
- Issue Date
- 7-12월-2015
- Publisher
- WILEY-V C H VERLAG GMBH
- Keywords
- energy storage materials; hollow nanospheres; onion-like carbon; nanostructures; synthesis design
- Citation
- CHEMISTRY-A EUROPEAN JOURNAL, v.21, no.50, pp.18202 - 18208
- Indexed
- SCIE
SCOPUS
- Journal Title
- CHEMISTRY-A EUROPEAN JOURNAL
- Volume
- 21
- Number
- 50
- Start Page
- 18202
- End Page
- 18208
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/91599
- DOI
- 10.1002/chem.201503357
- ISSN
- 0947-6539
- 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 degrees 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 Ag-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.
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