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Novel Synthesis and Characterization of Flexible MnO2/CNT Composites Co-deposited on Graphite Paper as Supercapacitor Electrodes

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Abstract

Although MnO2 possesses many advantages, such as a high theoretical specific capacity, resource abundance, easy synthesis and environmental friendliness, its poor electrical conductivity and low utilization seriously hinder its large-scale application as an electrode in supercapacitors. A MnO2 and carbon nanotube (CNT) composite is co-deposited on flexible expanded graphite paper (EGP) by a facile method of composite brush plating. The three-dimensional conductive net of CNT in the composite greatly improves the supercapacitve and mechanical properties of MnO2 electrode. The paper mainly studied (i) the choice of composite brush plating voltage and (ii) the effect of the concentration of active substance CNTs deposited on the performance of supercapacitor. When the current density is 20 A g–1, the mass specific capacitance of the flexible CNT@MnO2/EGP electrode with an operation potential of 10 V in an electrolyte of 1.5 g L–1 CNTs dropped is 146 F g–1. The CNT@MnO2/EGP/active carbon (AC)/carbon fibre cloth (CFC) flexible aqueous asymmetric supercapacitor (ASC) exhibits an energy density of 36.3 Wh kg–1 at a power density of 126.2 W kg–1 and high cycling stability with 91% capacitance retention after 4000 cycles. This study paves the way to provide a simple and novel technique for the mass production of flexible MnO2 supercapacitor electrodes.

Graphic Abstract

The composite brush electroplating technology is successfully developed for fabricating flexible carbon nanotube@MnO2 composite co-deposited on expanded graphite paper, which displays excellent capacitive performance and cycling stability in an aqueous media.

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Acknowledgments

This work was supported by the National Natural Science Foundation of China (51862026), the Aeronautical Science Foundation of China (2017ZF56027), the Natural Science Foundation of Jiangxi Province (20192ACBL21048), the Key Research and Development Program of Jiangxi Province (20203BBE53069).

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  1. School of Materials Science and Engineering, Nanchang Hangkong University, Nanchang, 330063, China

    Xueqin Li, Zhiguo Ye, Xinyuan Peng & Duosheng Li

  2. Global Energy Interconnection Research Institute Co., Ltd, Beijing, 102209, China

    Zhixiang Zhu, Guang Ma & Yi Ding

  3. Naqu Branch of Tibet Electric Limited Company, Naqu, 852000, China

    Jinlong Wang

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  1. Xueqin Li
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Li, X., Zhu, Z., Ma, G. et al. Novel Synthesis and Characterization of Flexible MnO2/CNT Composites Co-deposited on Graphite Paper as Supercapacitor Electrodes. J. Electron. Mater. 51, 2982–2994 (2022). https://doi.org/10.1007/s11664-022-09575-x

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