Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 5, Issue 20, Pages 10246-10252Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am403028z
Keywords
hydrogen annealing iron oxides; single-walled carbon nantube; hybrid films; lithium-ion batteries; electrochemical kinetics
Funding
- U.S. National Science Foundation (NSF) [1067947]
- Directorate For Engineering
- Div Of Civil, Mechanical, & Manufact Inn [1067960] Funding Source: National Science Foundation
- Directorate For Engineering
- Div Of Civil, Mechanical, & Manufact Inn [1067947] Funding Source: National Science Foundation
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A facile and effective hydrogen annealing method has been demonstrated to synthesize iron oxide/SWNT hybrid films involving the thermal reduction of rhombohedral Fe2O3 to cubic Fe3O4 through the phase transformation while maintaining the morphological integrity of the films. The poor rate capability and cyclic stability of the original alpha-Fe2O3/SWNT hybrid films have been significantly improved by H-2 annealing. The prepared iron oxide/SWNT hybrid films have a high capacity of 786 mA h g(-1) at a high current density of 4 A g(-1) with a prolonged lifetime. The enhancement of the electrochemical performance is attributed to the presence of highly conductive Fe3O4, accelerated charge-transfer kinetics, and the increased Li+ diffusivity confirmed by electrochemical impedance spectra and galvanostatic intermittent titration.
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