Improved electrochemical performance of amorphous MnO2 modified by a novel supermolecular compound

Zhan, Hui; Zhou, Yuanfeng; Wang, C.G.; Guo, Wen; Peng, Zhenghe

doi:10.1016/j.matchemphys.2004.10.012

Cited by 3 publications

(1 citation statement)

References 18 publications

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“…In comparison to the multiple crystallographic MnO 2 forms, amorphous MnO 2 has been considered a predominant candidate as an EC electrode material due to its large initial capacity [ 8 , 9 , 10 ]. However, due to the poor cycleability of amorphous MnO 2 , this material has not been extensively used in ECs [ 11 ].…”

Section: Introductionmentioning

confidence: 99%

Enhanced Cycleability of Amorphous MnO2 by Covering on α-MnO2 Needles in an Electrochemical Capacitor

Liu

Yang

et al. 2017

Materials

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An allomorph MnO2@MnO2 core-shell nanostructure was developed via a two-step aqueous reaction method. The data analysis of Scanning Electron Microscopy, Transmission Electron Microscopy, X-Ray Diffraction and N2 adsorption-desorption isotherms experiments indicated that this unique architecture consisted of a porous layer of amorphous-MnO2 nano-sheets which were well grown onto the surface of α-MnO2 nano-needles. Cyclic voltammetry experiments revealed that the double-layer charging and Faradaic pseudo-capacity of the MnO2@MnO2 capacitor electrode contributed to a specific capacitance of 150.3 F·g−1 at a current density of 0.1 A·g−1. Long cycle life experiments on the as-prepared MnO2@MnO2 sample showed nearly a 99.3% retention after 5000 cycles at a current density of 2 A·g−1. This retention value was found to be significantly higher than those reported for amorphous MnO2-based capacitor electrodes. It was also found that the remarkable cycleability of the MnO2@MnO2 was due to the supporting role of α-MnO2 nano-needle core and the outer amorphous MnO2 layer.

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