Nanocrystalline Manganese Oxides for Electrochemical Capacitors with Neutral Electrolytes
- 1 January 2002
- journal article
- Published by The Electrochemical Society in Journal of the Electrochemical Society
- Vol. 149 (11), A1419-A1422
- https://doi.org/10.1149/1.1511188
Abstract
With an objective to develop inexpensive electrode materials for electrochemical redox capacitors, nanocrystalline manganese oxides have been synthesized by reducing aqueous KMnO4KMnO4 solution with various reducing agents such as potassium borohydride, sodium dithionite, sodium hypophosphite, and hydrochloric acid under various controlled pH conditions. The products have been characterized by X-ray diffraction, thermogravimetric analysis, surface area measurements, and cyclic voltametry in various neutral electrolytes such as aqueous NaCl, KCl, LiCl, and Na2SO4.Na2SO4. Optimized samples exhibit specific capacitance values of around 250 F/g in the range of 0-1 V vs. SCE with excellent cyclability in 2 M NaCl electrolyte. © 2002 The Electrochemical Society. All rights reserved.Keywords
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