Layered manganese oxides-decorated and nickel foam-supported carbon nanotubes as advanced binder-free supercapacitor electrodes

Abstract
Three-dimensional carbon nanotubes@MnO2 core-shell nanostructures grown on Ni foam for binder-free capacitor electrodes have been fabricated by a floating catalyst chemical vapor deposition process and a facile hydrothermal approach. Ultrathin layered MnO2 nanosheets are uniformly coated on the surface of the carbon nanotubes (CNTs), directly grown on Ni foam. This unique well-designed binder-free electrode exhibits a high specific capacitance (325.5 F g-1 at a current density of 0.3 A g-1), good rate capability (70.7% retention), and excellent cycling stability (90.5% capacitance retention after 5000 cycles), due to the high conductivity of the close contact between CNTs and Ni foam, as well as the moderate specific surface area of the CNTs@MnO2 core-shell nanostructures. The developed synthetic strategy may provide design guidelines for constructing advanced binder-free supercapacitors electrode. © 2014 Elsevier B.V. All rights reserved.

Citation
Huang M, Mi R, Liu H, Li F, Zhao XL, et al. (2014) Layered manganese oxides-decorated and nickel foam-supported carbon nanotubes as advanced binder-free supercapacitor electrodes. Journal of Power Sources 269: 760–767. Available: http://dx.doi.org/10.1016/j.jpowsour.2014.07.031.

Acknowledgements
The authors gratefully acknowledge the financial supports provided by National Natural Science Foundation of China (Grant no. 51104194), Doctoral Fund of Ministry of Education of China (20110191120014), No. 43 Scientific Research Foundation for the Returned Overseas Chinese Scholars, National Key laboratory of Fundamental Science of Micro/Nano-device and System Technology (2013MS06, Chongqing University), State Education Ministry and Fundamental Research Funds for the Central Universities (Project no. CDJZR12248801, CDJZR12135501, and CDJZR13130035, Chongqing University, PR China). The authors acknowledge support on electrochemical characterization by Dr. Kexin Yao in King Abdullah University of Science and Technology, Saudi Arabia.

Publisher
Elsevier BV

Journal
Journal of Power Sources

DOI
10.1016/j.jpowsour.2014.07.031

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