Journal
ACS NANO
Volume 9, Issue 4, Pages 4026-4035Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.5b00088
Keywords
bubble nanorod; nanofibers; electrospinning; lithium ion battery; carbon composite
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Funding
- National Research Foundation of Korea (NRF) - Korea government (MEST) [2012R1A2A2A02046367]
- National Research Foundation of Korea [2012R1A2A2A02046367] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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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 degrees C under 10% H-2/Ar mixture gas atmosphere produces amorphous FeOx-carbon composite nanofibers. Post-treatment of the FeOx-carbon composite nanofibers at 300 degrees 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,
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