Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5459925 | Journal of Alloys and Compounds | 2017 | 32 Pages |
Abstract
A q-CNT-Fe3O4-C composite was synthesized via the homogeneous precipitation of FeOOH nanoparticles on quadrangular carbon nanotubes (q-CNT) substrates. The q-CNT multi-walled carbon nanotube featured one closed end and an open end with a quadrilateral cross section, and the nanotubes were prepared by using co-carbonization method. The FeOOH nanoparticles were encapsulated by amorphous carbon via a hydrothermal treatment and high-temperature calcination of glucose. TEM showed that diameter of the q-CNT was 100Â nm and the tube thickness was 20Â nm. The outer wall of the q-CNT was attached to Fe3O4 with sizes ranging from 80 to 100Â nm via a layer of an amorphous carbon coating. It delivered a specific capacity of 1031.5Â mAh gâ1 after 100 cycles at a current density of 200Â mAÂ gâ1. After 60 cycles, it showed a high specific capacity of 485.6Â mAh gâ1 even at 2000Â mAÂ gâ1. CV and EIS results further suggested that the q-CNT-Fe3O4-C composite exhibited lithium ion uptake/release reversibility and a rapid high current charge/discharge capability. The excellent rate performances of the q-CNT-Fe3O4-C composite can be attributed to the superior electronic transport properties of the quadrilateral CNT with one open end and the synergistic effects of the hybrid components.
Related Topics
Physical Sciences and Engineering
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Metals and Alloys
Authors
Donghui Xu, Guoen Luo, Jingfang Yu, Wenyan Chen, Congcong Zhang, Dong Ouyang, Yueping Fang, Xiaoyuan Yu,