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

Fingerprint

Nanospheres
Nanofibers
Onions
Electrochemical properties
Carbon
Conductive materials
Oxidation
Carbon nanofibers
Amorphous carbon
Electrospinning
cobalt ferrite
Nanocrystals
Atmosphere
Nanoparticles
Current density

Keywords

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

ASJC Scopus subject areas

  • Catalysis
  • Organic Chemistry

Cite this

Superior Electrochemical Properties of Nanofibers Composed of Hollow CoFe2O4 Nanospheres Covered with Onion-Like Graphitic Carbon. / Hong, Young Jun; Cho, Jung Sang; Kang, Yun Chan.

In: Chemistry - A European Journal, Vol. 21, No. 50, 07.12.2015, p. 18202-18208.

Research output: Contribution to journalArticle

@article{ee42ef6462da45529e357c8b6973c6e3,
title = "Superior Electrochemical Properties of Nanofibers Composed of Hollow CoFe2O4 Nanospheres Covered with Onion-Like Graphitic Carbon",
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.",
keywords = "energy storage materials, hollow nanospheres, nanostructures, onion-like carbon, synthesis design",
author = "Hong, {Young Jun} and Cho, {Jung Sang} and Kang, {Yun Chan}",
year = "2015",
month = "12",
day = "7",
doi = "10.1002/chem.201503357",
language = "English",
volume = "21",
pages = "18202--18208",
journal = "Chemistry - A European Journal",
issn = "0947-6539",
publisher = "Wiley-VCH Verlag",
number = "50",

}

TY - JOUR

T1 - Superior Electrochemical Properties of Nanofibers Composed of Hollow CoFe2O4 Nanospheres Covered with Onion-Like Graphitic Carbon

AU - Hong, Young Jun

AU - Cho, Jung Sang

AU - Kang, Yun Chan

PY - 2015/12/7

Y1 - 2015/12/7

N2 - 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.

AB - 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.

KW - energy storage materials

KW - hollow nanospheres

KW - nanostructures

KW - onion-like carbon

KW - synthesis design

UR - http://www.scopus.com/inward/record.url?scp=84948736555&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84948736555&partnerID=8YFLogxK

U2 - 10.1002/chem.201503357

DO - 10.1002/chem.201503357

M3 - Article

AN - SCOPUS:84948736555

VL - 21

SP - 18202

EP - 18208

JO - Chemistry - A European Journal

JF - Chemistry - A European Journal

SN - 0947-6539

IS - 50

ER -