Facile synthesis of tremella-like MnO<sub>2</sub> and its application as supercapacitor electrodes

doi:10.1007/s11706-015-0306-8

Front. Mater. Sci.

2015, Vol. 9

Issue (3) : 234-240 https://doi.org/10.1007/s11706-015-0306-8

RESEARCH ARTICLE

Facile synthesis of tremella-like MnO₂ and its application as supercapacitor electrodes

Xiangcang REN^1,²,Chuanjin TIAN^1,^*(

),Sa LI²,Yucheng ZHAO²,Chang-An WANG^2,^*

1. School of Materials Science and Engineering, Jingdezhen Ceramic Institute, Jingdezhen 333001, China
2. State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China

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Abstract

In this work, three kinds of ultrathin tremella-like MnO₂ have been simply synthesized by decomposing KMnO₄ under mild hydrothermal conditions. When applied as electrode materials, they all exhibited excellent electrochemical performance. The as-prepared MnO₂ samples were characterized by means of XRD, SEM, TEM and XPS. Additionally, the relationship of the crystalline nature with the electrochemical performance was investigated. Among the three samples, the product with the poorest crystallinity had the highest capacitance of 220 F/g at a current density of 0.1 A/g. It is thought that the ultrathin MnO₂ nanostructures can serve as promising electrode materials for supercapacitors.

Keywords hydrothermal manganese dioxide supercapacitor electrochemical property

Corresponding Author(s): Chuanjin TIAN,Chang-An WANG

Online First Date: 08 July 2015 Issue Date: 23 July 2015

Cite this article:

Xiangcang REN,Chuanjin TIAN,Sa LI, et al. Facile synthesis of tremella-like MnO₂ and its application as supercapacitor electrodes[J]. Front. Mater. Sci., 2015, 9(3): 234-240.

URL:

https://academic.hep.com.cn/foms/EN/10.1007/s11706-015-0306-8
https://academic.hep.com.cn/foms/EN/Y2015/V9/I3/234

Fig.1 XRD patterns of the obtained MnO₂: 0.2 g KMnO₄ (a); 4 g KMnO₄ (b); 6 g KMnO₄ (c).

Fig.2 XPS spectrum of the obtained MnO₂ (Sample I).

Fig.3 SEM and TEM images of (a)(b) Sample I, (c)(d) Sample II, and (e)(f) Sample III.

Fig.4 CV curves of the tremella-like MnO₂ at a scan rate of 5 mV/s.

Fig.5 Galvanostatic charge–discharge curves of the tremella-like MnO₂ at a current density of 0.1 A/g.

Fig.6 Variation of gravimetric capacitance of the three samples with the charge–discharge current density.

Fig.7 Nyquist plots of the three samples at the alternating current (AC) voltage amplitude of 5 mV.

Fig.8 Cycling performance of the three samples for 10000 cycles at a scan rate of 5 A/g.

Tab.1

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