Superior electrochemical properties of α-Fe2O3 nanofibers with a porous core/dense shell structure formed from iron acetylacetonate-polyvinylpyrrolidone composite fibers

Jung Hyun Kim, Young Jun Hong, Yun Chan Kang, Yun Ju Choi, Yang Soo Kim

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Porous core/dense shell α-Fe2O3 nanofibers were prepared by heat-treating electrospun gel nanofibers containing iron acetylacetonate-polyvinylpyrrolidone at 500 °C. Diffusion of Fe to the outer part of the nanofibers during the heating process results in a polyvinylpyrrolidone (PVP)-rich interior. Combustion of phase separated nanofibers produces α-Fe2O3 nanofibers with a porous core/dense shell structure. The nanofiber shell thickness and core diameter are 26 and 130 nm, respectively. The initial discharge and charge capacities of the α-Fe2O3 nanofibers at a current density of 1000 mA g-1 are 1392 and 1112 mA h g-1, respectively; the discharge capacities for the 2nd and 100th cycles are 1149 and 1225 mA h g-1, respectively. The stable reversible discharge capacities of the nanofibers decreased from 1198 to 1061 mA h g-1 as the current density increased from 500 to 3000 mA g-1.

Original languageEnglish
Pages (from-to)211-218
Number of pages8
JournalElectrochimica Acta
Volume154
DOIs
Publication statusPublished - 2015 Feb 1

Keywords

  • Electrospinning
  • Energy conversion
  • Energy storage materials
  • Nanostructures
  • Synthesis design

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Electrochemistry

Fingerprint Dive into the research topics of 'Superior electrochemical properties of α-Fe<sub>2</sub>O<sub>3</sub> nanofibers with a porous core/dense shell structure formed from iron acetylacetonate-polyvinylpyrrolidone composite fibers'. Together they form a unique fingerprint.

Cite this