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Nanomaterials 2019, 9(4), 586; https://doi.org/10.3390/nano9040586

Hybrid CoO Nanowires Coated with Uniform Polypyrrole Nanolayers for High-Performance Energy Storage Devices

1, 2,3,* and 4,*
1
School of Chemistry & Environment Engineering, Hubei University for Nationalities, Enshi 445000, China
2
School of Engineering, Zhejiang A&F University, Hangzhou 311300, China
3
Department of Materials Science and Engineering, National University of Singapore, Singapore 117574, Singapore
4
Institute of Flexible Electronics, Northwestern Polytechnical University, Xi’an 710072, China
*
Authors to whom correspondence should be addressed.
Received: 25 March 2019 / Revised: 2 April 2019 / Accepted: 3 April 2019 / Published: 9 April 2019
(This article belongs to the Special Issue Materials and Components for Electrochemical Storage Devices)
PDF [666 KB, uploaded 9 April 2019]

Abstract

Transition metal oxides with high theoretic capacities are promising materials as battery-type electrodes for hybrid supercapacitors, but their practical applications are limited by their poor electric conductivity and unsatisfied rate capability. In this work, a hybrid structure of CoO nanowires coated with conformal polypyrrole (Ppy) nanolayer is proposed, designed and fabricated on a flexible carbon substrate through a facile two-step method. In the first step, porous CoO nanowires are fabricated on flexible carbon substrate through a hydrothermal procedure combined with an annealing process. In the second step, a uniform nanolayer of Ppy is further coated on the surfaces of the CoO nanowires, resulting in a hybrid core-shell [email protected] nanoarrays. The [email protected] aligned on carbon support can be directly utilized as electrode material for hybrid supercapacitors. Since the conductive Ppy coating layer provides enhanced electric conductivity, the hybrid electrode demonstrates much higher capacity and superior rate capability than pure CoO nanowires. As a further demonstration, Ppy layer can also be realized on SnO2 nanowires. Such facile conductive-layer coating method can be also applied to other types of conducting polymers (as the shell) and metal oxide materials (as the core) for various energy-related applications.
Keywords: core-shell structure; conducting polymer coating; transition metal oxide; electrochemical capacitor; nanoarrays core-shell structure; conducting polymer coating; transition metal oxide; electrochemical capacitor; nanoarrays
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Yang, C.; Chen, H.; Guan, C. Hybrid CoO Nanowires Coated with Uniform Polypyrrole Nanolayers for High-Performance Energy Storage Devices. Nanomaterials 2019, 9, 586.

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