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Research Article

A facile one-step approach to hierarchically assembled core–shell-like MnO2@MnO2 nanoarchitectures on carbon fibers: An efficient and flexible electrode material to enhance energy storage

Goli Nagaraju1, Yeong Hwan Ko1, Sung Min Cha1, Sang Hyuk Im2, Jae Su Yu1( )
Department of Electronics and Radio EngineeringInstitute for Wearable Convergence ElectronicsKyung Hee University1732 Deogyeong-daeroGiheung-guYongin-siGyeonggi-do446-701Republic of Korea
Functional Crystallization Center (ERC)Department of Chemical EngineeringKyung Hee University1732 Deogyeong-daeroGiheung-guYongin-siGyeonggi-do446-701Republic of Korea
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Graphical Abstract

Abstract

Hierarchical core–shell-like MnO2 nanostructures (NSs) were used to anchor MnO2 hexagonal nanoplate arrays (HNPAs) on carbon cloth (CC) fibers. The NSs were prepared by a novel one-step electrochemical deposition method. Under an external cathodic voltage of -2.0 V for 30 min, hierarchical core–shell-like MnO2-NS-decorated MnO2 HNPAs (MnO2 NSs@MnO2 HNPAs) were uniformly grown on CC with reliable adhesion. The phase purity and morphological properties of the samples were characterized by various physicochemical techniques. At a constant external cathodic voltage, growth of MnO2 NSs@MnO2 HNPAs on CC was carried for different time periods. When utilized as a flexible, robust, and binder-free electrode for pseudocapacitors, the hierarchical core–shell-like MnO2 NSs@MnO2 HNPAs on CC showed clearly enhanced electrochemical properties in 1 M Na2SO4 electrolyte solution. The results indicate that the MnO2 NSs@MnO2 HNPAs on CC have a maximum specific capacitance of 244.54 F/g at a current density of 0.5 A/g with excellent cycling stability compared to that of bare MnO2 HNPAs on CC (112.1 F/g at 0.5 A/g current density). We believe that the superior charge storage performance of the pseudocapacitive electrode can be mainly attributed to the hierarchical MnO2 NSs@MnO2 HNPAs building blocks that have a large specific surface area, offering additional electroactive sites for efficient electrochemical reactions. The facile and single-step approach to growth of hierarchical pseudocapacitive materials on textile based electrodes opens up the possibility for the fabrication of high-performance flexible energy storage devices.

Keywords

manganese oxidehierarchical structurescarbon clothelectrochemical depositionenergy storage properties

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Nano Research
Volume 9 Issue 5,
May 2016
Pages 1507-1522
DOI: 10.1007/s12274-016-1047-4
Cite this article:
Nagaraju G, Ko YH, Cha SM, et al. A facile one-step approach to hierarchically assembled core–shell-like MnO2@MnO2 nanoarchitectures on carbon fibers: An efficient and flexible electrode material to enhance energy storage. Nano Research, 2016, 9(5): 1507-1522. https://doi.org/10.1007/s12274-016-1047-4

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Received: 12 December 2015
Revised: 28 January 2016
Accepted: 14 February 2016
Published: 29 September 2016
© Tsinghua University Press and Springer-Verlag Berlin Heidelberg 2016
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