Journal
RSC ADVANCES
Volume 3, Issue 19, Pages 6787-6793Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3ra22350g
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Funding
- National Natural Science Foundation of China [51101139]
- Zijin Program of Zhejiang University, China
- Ph.D. Programs Foundation of the Ministry of Education of China [20100101120024]
- Foundation of Education Office of Zhejiang Province [Y201016484]
- Qianjiang Talents Project of Science Technology Department of Zhejiang Province [2011R10021]
- Key Science and Technology Innovation Team of Zhejiang Province [2010R50013]
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In this study, we synthesized C-Fe3O4-C core-shell nanotubes through a facile chemical vapor deposition (CVD) method using Fe2O3 nanotubes as the self-templates. The hydrothermal product alpha-Fe2O3 hematite exhibits a tubular structure with an inner diameter of 70-100 nm, a wall thickness of 10-20 nm, and a length of 300-800 nm. After the CVD reaction in C2H2, alpha-Fe2O3 could be transformed into C-Fe3O4-C with the tubular structure reserved. The tubular C-Fe3O4-C is constructed by an Fe3O4 nanotube core and 5 nm thick carbon shells on both inner and outer surfaces of the Fe3O4 nanotube. The C-Fe3O4-C nanotube anode exhibits a stable cycling with a capacity over 700 mA h g(-1) retained after 120 cycles at 100 mA g(-1). The improved electrochemical properties of C-Fe3O4-C nanotubes compared with bare alpha-Fe2O3 could be attributed to the introduction of the carbon shells, which not only supply a high conductive channel and buffer matrix, but also keep the structural stability of the Fe3O4 nanotube upon cycling.
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