期刊
JOURNAL OF PHYSICAL CHEMISTRY C
卷 115, 期 50, 页码 24688-24695出版社
AMER CHEMICAL SOC
DOI: 10.1021/jp2096482
关键词
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资金
- Natural Science Foundation of China [20921001, 20535020]
- Innovation Method Fund of China [20081885189]
- National High Technology Research and Development Program of China [2009AA03Z321]
Monodisperse superparamagnetic Fe3O4 nanocubes with the edge length up to approximately 16 nm were synthesized by using a biomolecule-assisted solvothermal approach. The Fe3O4 nanocubes are characterized by X-ray powder diffraction, Raman spectroscopy, Fourier transform infrared spectroscopy, transmission electron microscopy, and high-resolution transmission electron microscopy. The magnetic properties of the Fe3O4 nanocubes are studied by zero-field cooling (ZFC) and field cooling (FC) procedures, i.e., M-T and M-H curves. The electrochemical behavior of the Fe3O4 nanocubes was tested in lithium ion batteries, which presents high specific capacitance of 695.1 mA center dot h/g at a current rate of 0.2 C, higher than that of commonly used graphite electrode (372 mA center dot h/g), as well as excellent Coulombic efficiency of above 95% after the 11th cycle in the subsequent cycles.
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