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Freestanding one-dimensional manganese dioxide nanoflakes-titanium cabide/carbon core/double shell arrays as ultra-high performance supercapacitor electrode

Authors :
Dianxue Cao
Yinyi Gao
Kui Cheng
Guiling Wang
Shuying Kong
Tian Ouyang
Ke Ye
Source :
Journal of Power Sources. 293:519-526
Publication Year :
2015
Publisher :
Elsevier BV, 2015.

Abstract

In this paper, freestanding one-dimensional MnO 2 nanoflakes are successful prepared through a simple hydrothermal reaction by using the carbon shell of TiC/C core/shell arrays as the sacrificial template. Its structure and morphology are characterized by X-ray diffractometer, X-ray photoelectron spectroscopy, Raman spectroscopy, scanning electron microscopy, energy dispersive X-ray spectrometer and transmission electron microscopy. Results show that the thickness of the carbon shell decreased but also remained and the ultrathin MnO 2 nanoflakes with thickness less than 5 nm uniformly grow on the surfaces of the TiC/C nanowire to form a core/double shell structure after the hydrothermal reaction. The electrochemical performance of the as-prepared electrode is evaluated by cyclic voltammetrys, galvanostatic charging-discharging tests and electrochemical impedance spectroscopy, and high capacities, excellent rate capabilities and exemplary cycling performance is obtained. The as-prepared electrode shows a high specific capacitance of 598.8 F g −1 and 85.8% of its initial capacitance is retained after 10,000 cycles at a high discharge current density of 10 A g −1 , suggesting that this structure has a promising future as high-performance supercapacitor electrode.

Details

ISSN :
03787753
Volume :
293
Database :
OpenAIRE
Journal :
Journal of Power Sources
Accession number :
edsair.doi...........6708a46c0e719ab67bad3e06d9a9b20c
Full Text :
https://doi.org/10.1016/j.jpowsour.2015.05.062