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Journal of Nanoparticle Research
Published in: Journal of Nanoparticle Research 12/2015

01-12-2015 | Research Paper

Magnetic-field-assisted synthesis of Co3O4 nanoneedles with superior electrochemical capacitance

Authors: Tao Zhu, Yan Xie, Guoxiong Zhang, Zhenni He, Yisheng Lu, Haibo Guo, Chuan Lin, Yigang Chen

Published in: Journal of Nanoparticle Research | Issue 12/2015

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Abstract

Nanostructured Co3O4 films have been deposited on nickel foam in a magnetic-field-assisted hydrothermal process followed by annealing in air. The magnetic field strength is varied to study its relationship with nanostructures, morphology, and electrochemical properties of the Co3O4 electrodes. The Co3O4 films synthesized in the weak magnetic fields consist of dispersed nanoneedles, which are different from clustered nanoneedles when the magnetic field is absent. Moreover, the magnetic fields (of several millitesla) induced substantial changes in the nanostructures and electrochemical properties of the Co3O4 films. A possible formation mechanism of Co3O4 nanoneedles is proposed by comparing the morphologies and nanostructures of the films synthesized with and without the magnetic fields. Among these electrodes, the optimal one has a high specific capacitance (970.8 F g−1 at 0.5 A g−1), good power capability (847.5 F g−1 at 6.0 A g−1), and an excellent retention ratio (93.7 % over 1000 cycles). All these impressive results demonstrate that magnetic fields may be an economic and effective tool in hydrothermal synthesis of Co3O4 electrodes for high-performance supercapacitors.
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Metadata
Title
Magnetic-field-assisted synthesis of Co3O4 nanoneedles with superior electrochemical capacitance
Authors
Tao Zhu
Yan Xie
Guoxiong Zhang
Zhenni He
Yisheng Lu
Haibo Guo
Chuan Lin
Yigang Chen
Publication date
01-12-2015
Publisher
Springer Netherlands
Published in
Journal of Nanoparticle Research / Issue 12/2015
Print ISSN: 1388-0764
Electronic ISSN: 1572-896X
DOI
https://doi.org/10.1007/s11051-015-3297-6

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