Abstract
A test cell has been developed to examine some metal oxides for their possible application as active oxygen-evolving materials. The testswere run with doped MnO 2 electrodes in 9 M KOH and applying current densities up to 10 mA/cm 2. The most effective additives were vanadium pentoxide (V 2O 5) (if applied in higher concentrations), nickel cobaltites (NiO·Co 2O 3 and NiO·2CoO) and the cobalt-spinel Co 3O 4. These compounds were able to convert electrical charges to oxygen with an efficiency close to 100%. The promoted oxygen evolution prevents the oxidation of the MnO 2 electrode to soluble manganates subsequently disproportionating to Mn(IV) and Mn(II) causing a loss of active material because the latter will not be re-oxidized to Mn(IV) on charge.
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