Renuka, R. and Ramamurthy, S. (2000) An investigation on layered birnessite type manganese oxides for battery applications. Journal of Power Sources, 87. pp. 144-152. ISSN 0378-7753

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Layered birnessite-type manganese oxide was prepared by a simple redox sol–gel reaction involving hydroxylamine and permanganate in alkaline medium. IR, XRD, Auger electron spectroscopy, EPR, TGA and cyclic voltammetric characteristics of the birnessites are presented. The birnessite was examined for its cathode performance in zinc-, magnesium- and lithium-based cells. Bismuth and lead exchanged birnessite show superior battery performance when compared with sodium and potassium precursors. The magnetoresistance pattern of the discharged birnessite in MgrMg (ClO4)2. indicates a colossal magnetoresistance. This observation provides a scope for further studies of examining the applicability of magnetoresistance measurement in assessing the chargerdischarge status of manganese oxides. Heat treatment of birnessite brings about distinct changes in the EPR and IR pattern. A correlation between the spectral features and electrochemical activity can be understood.

Item Type: Article
Uncontrolled Keywords: Birnessite; Sol–gel synthesis; Hydroxylamine–permanganate redox reaction; Battery performance; EPR; Magnetoresistance
Subjects: Electrochemical Power Sources
Depositing User: ttbdar CECRI
Date Deposited: 28 Feb 2012 15:20
Last Modified: 28 Feb 2012 15:20

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