Superior electrochemical properties of alpha-Fe2O3 nanofibers with a porous core/dense shell structure formed from iron acetylacetonate-polyvinylpyrrolidone composite fibers
- Authors
- Kim, Jung Hyun; Hong, Young Jun; Kang, Yun Chan; Choi, Yun Ju; Kim, Yang Soo
- Issue Date
- 1-2월-2015
- Publisher
- PERGAMON-ELSEVIER SCIENCE LTD
- Keywords
- Energy storage materials; Synthesis design; Energy conversion; Nanostructures; Electrospinning
- Citation
- ELECTROCHIMICA ACTA, v.154, pp.211 - 218
- Indexed
- SCIE
SCOPUS
- Journal Title
- ELECTROCHIMICA ACTA
- Volume
- 154
- Start Page
- 211
- End Page
- 218
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/94435
- DOI
- 10.1016/j.electacta.2014.11.181
- ISSN
- 0013-4686
- Abstract
- Porous core/dense shell alpha-Fe2O3 nanofibers were prepared by heat-treating electrospun gel nanofibers containing iron acetylacetonate-polyvinylpyrrolidone at 500 degrees 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 alpha-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 alpha-Fe2O3 nanofibers at a current density of 1000 m Ag-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 m Ag-1. (C) 2014 Elsevier Ltd. All rights reserved.
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