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Article

Hierarchical Mn2O3 Microspheres In-Situ Coated with Carbon for Supercapacitors with Highly Enhanced Performances

1
Institute of Applied Chemistry, Xinjiang University, Urumqi 830046, China
2
State Laboratory of Surface and Interface Science and Technology, Zhengzhou University of Light Industry, Zhengzhou 450002, China
3
School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
4
American Advanced Nanotechnology, Houston, TX 77459, USA
*
Author to whom correspondence should be addressed.
Nanomaterials 2017, 7(12), 409; https://doi.org/10.3390/nano7120409
Received: 7 October 2017 / Revised: 12 November 2017 / Accepted: 21 November 2017 / Published: 23 November 2017
(This article belongs to the Special Issue Nanomaterials Based Fuel Cells and Supercapacitors)
Porous Mn2O3 microspheres have been synthesized and in-situ coated with amorphous carbon to form hierarchical [email protected]2O3 microspheres by first producing MnCO3 microspheres in solvothermal reactions, and then annealing at 500 °C. The self-assembly growth of MnCO3 microspheres can generate hollow structures inside each of the particles, which can act as micro-reservoirs to store biomass-glycerol for generating amorphous carbon onto the surfaces of Mn2O3 nanorods consisting of microspheres. The [email protected]2O3 microspheres, prepared at 500 °C, exhibit highly enhanced pseudocapacitive performances when compared to the particles after annealed at 400 °C and 600 °C. Specifically, the [email protected]2O3 microspheres prepared at 500 °C show high specific capacitances of 383.87 F g−1 at current density of 0.5 A g−1, and excellent cycling stability of 90.47% of its initial value after cycling for 5000 times. The asymmetric supercapacitors assembled with [email protected]2O3 microspheres after annealed at 500 °C and activated carbon (AC) show an energy density of up to 77.8 Wh kg−1 at power density of 500.00 W kg−1, and a maximum power density of 20.14 kW kg−1 at energy density of 46.8 Wh kg−1. We can attribute the enhanced electrochemical performances of the materials to their three-dimensional (3D) hierarchical structure in-situ coated with carbon. View Full-Text
Keywords: Mn2O3 microspheres; in-situ carbonization; amorphous carbon; hierarchical materials; pseudocapacitors Mn2O3 microspheres; in-situ carbonization; amorphous carbon; hierarchical materials; pseudocapacitors
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MDPI and ACS Style

Gong, F.; Lu, S.; Peng, L.; Zhou, J.; Kong, J.; Jia, D.; Li, F. Hierarchical Mn2O3 Microspheres In-Situ Coated with Carbon for Supercapacitors with Highly Enhanced Performances. Nanomaterials 2017, 7, 409. https://doi.org/10.3390/nano7120409

AMA Style

Gong F, Lu S, Peng L, Zhou J, Kong J, Jia D, Li F. Hierarchical Mn2O3 Microspheres In-Situ Coated with Carbon for Supercapacitors with Highly Enhanced Performances. Nanomaterials. 2017; 7(12):409. https://doi.org/10.3390/nano7120409

Chicago/Turabian Style

Gong, Feilong, Shuang Lu, Lifang Peng, Jing Zhou, Jinming Kong, Dianzeng Jia, and Feng Li. 2017. "Hierarchical Mn2O3 Microspheres In-Situ Coated with Carbon for Supercapacitors with Highly Enhanced Performances" Nanomaterials 7, no. 12: 409. https://doi.org/10.3390/nano7120409

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