Synthesis, characterization and electrochemical impedance spectroscopy of VOx-NTs/PPy composites

Cui C.; Wu G.; Yang H.She S.Shen J.Zhou B.Zhang Z.

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Synthesis, characterization and electrochemical impedance spectroscopy of VOx-NTs/PPy composites

机译：Synthesis, characterization and electrochemical impedance spectroscopy of VOx-NTs/PPy composites

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Composites consisting of vanadium oxide nanotubes (VOx-NTs) and polypyrrole (PPy) were synthesized by a two-steps method. VOx-NTs were firstly prepared by a combined solgel reaction and hydrothermal treatment procedure, in which V _2O_5 powder and H_2O_2 were used as raw materials and hexadecylamine as a structure-directing template. Then VOx-NTs/PPy composites were fabricated by a cationic exchange reaction between hexadecylamine and polypyrrole. The structure and morphology of the samples were investigated by SEM, TEM, XRD and FTIR techniques. The results confirmed that the template molecules were successfully substituted by the conducting polymers PPy without destroying the previous tubular structure. Electrochemical impedance spectroscopy (EIS) measurements were performed to evaluate the electrochemical kinetics of the samples. The results indicated that VOx-NTs/PPy composites had a lower charge transfer resistance and a faster lithium-ion diffusion speed than those of VOx-NTs, and the enhanced electrochemical kinetics could be attributed to the excellent electronic conductivity of polypyrrole.

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来源
《Solid State Communications》 |2010年第38期|1807-1811|共5页
作者
Cui C.; Wu G.; Yang H.She S.Shen J.Zhou B.Zhang Z.;
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作者单位

Pohl Institute of Solid State Physics, Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology, Tongji University, Shanghai 200092, China;

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正文语种英语
中图分类固体物理学;
关键词
A. Hybrid composites; A. Polypyrrole; A. VOx-NTs; E. Electrochemical impedance spectroscopy;

Synthesis, characterization and electrochemical impedance spectroscopy of VOx-NTs/PPy composites

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