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Novel Electrode Materials for Ultracapacitors:Structural and Electrochemical Properties of Sol-Gel-Derived Manganese Dioxide Thin Films

Published online by Cambridge University Press:  10 February 2011

Suh-Cern Pang  and
MarcA Anderson
Suh-Cern Pang
Affiliation:
Water Chemistry Program, Water Science & Engineering Lab, University of Wisconsin-Madison, 660 N Park St, Madison, WI 53706.
MarcA Anderson
Affiliation:
Water Chemistry Program, Water Science & Engineering Lab, University of Wisconsin-Madison, 660 N Park St, Madison, WI 53706.
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Abstract

Nanoparticulate MnO2 thin films fabricated by the sol-gel process have been shown to be an outstanding novel electrode material for Ultracapacitors. The average specific capacitance of sol-gel-derived MnO2 thin-films on nickel substrates as determined by cyclic voltammetry ranged from 566 to 698 F/g. These films also exhibited good cycling stability within the potential range of 0.0-0.9V (vs SCE) in unbuffered aqueous electrolyte. Both CV and XPS studies showed that MnO2 films have remained chemically and structurally intact after 1,500 cycles. The XRD spectra and SEM micrographs showed that the microstructure of MnO2 thin films are highly porous, and poorly crystalline or amorphous in nature. The high specific capacitance of MnO2 may be predominantly due to pseudocapacitance associated with homogenous and reversible redox reactions of proton insertion into and out of the MnO2 lattice. Any variation in the microstructure and thickness of films might affect proton mobility within the oxide matrix and thereby affecting their cycling behaviors. Further optimization of the cycling behaviors is envisaged with better microstructural and thickness control of these sol-gelderived nanoparticulate MnO2 thin films.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 575: Symposium CC – New Materials for Batteries & Fuel Cells , 1999 , 415
Copyright
Copyright © Materials Research Society 2000

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