Abstract:
Doped manganese dioxides (beta-Mno2) were prepared by thermal decomposition (180-degrees-C) of manganese nitrate in the presence of weighted quantities of NH4VO3, Na2WO4.2H2O, LiNO3, AgNO3 or MoO3. Detailed chemical analyses, surface area and pycnometric density determinations were carried out, and the electrochemical performance was evaluated in H2SO4 (8 N) electrolyte. The discharge behaviour was monitored using constant currents and constant resistances (both continuous and intermittent discharge). Some of the Mo-doped samples together with the Li- and Ag-doped materials performed well as cathodes in H2SO4. The consistency of discharge duration under different discharge regimes was a marked feature of the behaviour of some of the compositions.
