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A Comparative Study of Potentiostatic and Potentiodynamic Method in the Synthesis of MnO2 Films for Electrochemical Capacitors

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Abstract:

Nanostructured ε-manganese dioxide films are deposited directly on three-dimensional nickel foam (NF) from 0.25 M Mn(CH3COO)2 by means of the potentiostatic method (PSM) and potentiodynamic method (PDM). The prepared MnO2 films are characterized by X-ray diffraction and scanning electron microscopy. The electrochemical properties of MnO2 films are investigated by cyclic voltammetry (CV), charge-discharge tests, and alternating current (AC) impedance spectroscopy. The results show that the PSM-MnO2 films exhibit higher specific capacitance and better high-rate discharge ability, which are more promising for applications in supercapacitor than PDM-MnO2 films. The specific capacitance of PSM-MnO2 films is about 664 F g-1 at 5.5 A g-1, which is higher than many reported values.

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Periodical:

Advanced Materials Research (Volumes 239-242)

Pages:

501-505

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.239-242.501

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Online since:

May 2011

Authors:

Ling Bin Kong, Rui Juan Bai, Yong Chun Luo, Long Kang

Keywords:

Electrochemical Capacitor, Electro-Deposition, Manganese Dioxide, Pseudocapacitive Behavior

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© 2011 Trans Tech Publications Ltd. All Rights Reserved

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