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Issue 48, 2019
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The NH4F-induced morphology control of hierarchical CoO@MnO2 core–shell arrays for high performance supercapacitor electrodes

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Abstract

Hierarchical CoO@MnO2 core–shell arrays with controllable morphology were fabricated by direct growth on 3D nickel foam by a facile two-step hydrothermal method. It was found that the morphology of CoO could be effectively controlled by the amount of loaded NH4F with the assistance of ethylene glycol and urea. As a result, disordered nanowires, highly ordered nanowires, dense nanowire clusters and compact bulk CoO were obtained upon increasing the NH4F amount, which in turn were passed on to the subsequent CoO@MnO2 core–shell arrays. Electrochemical tests indicate that the micro-morphology of the CoO@MnO2 arrays significantly affected their electrochemical performance. Among all the samples, the synthesized hierarchical 1 : 2CoO@MnO2 core–shell arrays formed from highly ordered CoO nanowires exhibited the highest specific capacitance (1505.7 F g−1 at a current density of 1 A g−1), low charge transfer resistance, and excellent rate performance and cycling stability (91.7% retention after 5000 cycles at 5 A g−1 and the coulombic efficiency remained at over 98.6%).

Graphical abstract: The NH4F-induced morphology control of hierarchical CoO@MnO2 core–shell arrays for high performance supercapacitor electrodes

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Supplementary files

Article information


Submitted
06 Sep 2019
Accepted
07 Nov 2019
First published
12 Nov 2019

CrystEngComm, 2019,21, 7468-7475
Article type
Paper

The NH4F-induced morphology control of hierarchical CoO@MnO2 core–shell arrays for high performance supercapacitor electrodes

Y. Sun, J. Zhang, X. Sun and N. Huang, CrystEngComm, 2019, 21, 7468
DOI: 10.1039/C9CE01407A

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