Self-Limiting Electrodeposition of Hierarchical MnO2 and M(OH)(2)/MnO2 Nanofibril/Nanowires: Mechanism and Supercapacitor Properties

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Hierarchical nanostructures have generated great interest in the energy, materials, and chemical sciences due to the synergic properties of their composite architectures. Herein, a hierarchical Mn0(2) nanofibril/nanowire array is successfully synthesized. The structure consists of a conformal layer of Mn0(2) nanofibrils evenly distributed on the surface of the individual Mn0(2) nanowires. The synthetic mechanism of this hierarchical structure is characterized by electrochemical measurements, Raman spectroscopy, EELS, and electron microscopy. This material was then investigated at slow scan rates for its charge storage mechanisms in different solvents. In aqueous electrolyte, the nanofibrils show a capacitance almost purely dedicated to double-layer and surface adsorption processes, while in an acetonitrile electrolyte, the nanofibrils' capacitance comes mainly from a cation insertion process. This material was also tested at high scan rates in aqueous solution for its practical supercapacitor capabilities. The material shows a large capacitance of 298 F/g at 50 mV/s and 174 F/g at 250 mV/s. It also maintains 85.2% of its capacitance after 1000 cycles. The material also displays easily controllable parameters such as nanowire length, nanowire diameter, and amount of nanofibril material which is shown here to affect the capacitance dramatically.
Publisher
AMER CHEMICAL SOC
Issue Date
2013-02
Language
English
Article Type
Article
Keywords

ELECTROCHEMICAL ENERGY-STORAGE; TRANSITION-METAL OXIDES; LITHIUM-ION BATTERIES; MANGANESE-DIOXIDE; HIGH-CAPACITY; PERFORMANCE; NANOWIRES; NANOSTRUCTURES; CATHODE; SPECTRA

Citation

ACS NANO, v.7, no.2, pp.1200 - 1214

ISSN
1936-0851
DOI
10.1021/nn3056077
URI
http://hdl.handle.net/10203/173466
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