Studies on chemically precipitated Mn(IV) oxides. IV. Effect of dopants/impurities on the discharge behaviour of chemical manganese dioxide in alkaline medium and the applicability of Atlung-Jacobsen model to the (MnO2)1-r(MnOOH)r system
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- Fernandes, J.B., Desai, B.D. & Dalal, V.N.K. J Appl Electrochem (1985) 15: 351. doi:10.1007/BF00615987
Manganese (IV) oxides are synthesized by chlorate oxidation of Mn(II) salts containing varying amounts of Fe3+ ions. An Mn(IV) oxide containing MoO3 is also synthesized. All the oxides are characterized by chemical analyses, X-ray, infrared and magnetic susceptibility studies. It is observed that increasing the amount of Fe3+ in the Mn(II) solution favours the formation of the gamma-phase. The catalytic and electrochemical activity of the dioxides are evaluated and discussedvis-à-vis their structural factors. The structure and activity are further discussed in the light of the Atlung-Jacobsen model and the recent electrochemical reduction mechanism of Maskell, Shaw and Tye.