Abstract
A structure denoted as a "bubble-nanorod composite" is synthesized by introducing the Kirkendall effect into the electrospinning method. Bubble-nanorod-structured Fe2O3-C composite nanofibers, which are composed of nanosized hollow Fe2O3 spheres uniformly dispersed in an amorphous carbon matrix, are synthesized as the target material. Post-treatment of the electrospun precursor nanofibers at 500°C under 10% H2/Ar mixture gas atmosphere produces amorphous FeOx-carbon composite nanofibers. Post-treatment of the FeOx-carbon composite nanofibers at 300°C under air atmosphere produces the bubble-nanorod-structured Fe2O3-C composite nanofibers. The solid Fe nanocrystals formed by the reduction of FeOx are converted into hollow Fe2O3 nanospheres during the further heating process by the well-known Kirkendall diffusion process. The discharge capacities of the bubble-nanorod-structured Fe2O3-C composite nanofibers and hollow bare Fe2O3 nanofibers for the 300th cycles at a current density of 1.0 A g-1 are 812 and 285 mA h g-1, respectively, and their capacity retentions measured from the second cycle are 84 and 24%, respectively. The hollow nanospheres accommodate the volume change that occurs during cycling. The unique structure of the bubble-nanorod-structured Fe2O3-C composite nanofibers results in their superior electrochemical properties by improving the structural stability during long-term cycling.
Original language | English |
---|---|
Pages (from-to) | 4026-4035 |
Number of pages | 10 |
Journal | ACS nano |
Volume | 9 |
Issue number | 4 |
DOIs | |
Publication status | Published - 2015 Apr 28 |
Bibliographical note
Publisher Copyright:© 2015 American Chemical Society.
Keywords
- bubble nanorod
- carbon composite
- electrospinning
- lithium ion battery
- nanofibers
ASJC Scopus subject areas
- General Materials Science
- General Engineering
- General Physics and Astronomy