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Directly Grown Multiwall Carbon Nanotube and Hydrothermal MnO2 Composite for High-Performance Supercapacitor Electrodes

Institute of Micro-nano Structures & Optoelectronics, Wenzhou University, Wenzhou 325035, China
*
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Nanomaterials 2019, 9(5), 703; https://doi.org/10.3390/nano9050703
Received: 27 March 2019 / Revised: 26 April 2019 / Accepted: 28 April 2019 / Published: 6 May 2019
(This article belongs to the Special Issue Nanotubes for Health, Environment and Cultural Heritages)
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Abstract

MnO2–MWNT–Ni foam supercapacitor electrodes were developed based on directly grown multiwalled carbon nanotubes (MWNTs) and hydrothermal MnO2 nanostructures on Ni foam substrates. The electrodes demonstrated excellent electrochemical and battery properties. The charge transfer resistance dropped 88.8% compared with the electrode without MWNTs. A high specific capacitance of 1350.42 F·g−1 was reached at the current density of 6.5 A·g−1. The electrode exhibited a superior rate capability with 92.5% retention in 25,000 cycles. Direct MWNT growth benefits the supercapacitor application for low charge transfer resistance and strong MWNT–current collector binding. View Full-Text
Keywords: carbon nanotube; supercapacitor; chemical vapor deposition; manganese dioxide; hydrothermal method carbon nanotube; supercapacitor; chemical vapor deposition; manganese dioxide; hydrothermal method
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Li, L.; Chen, L.; Qian, W.; Xie, F.; Dong, C. Directly Grown Multiwall Carbon Nanotube and Hydrothermal MnO2 Composite for High-Performance Supercapacitor Electrodes. Nanomaterials 2019, 9, 703.

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