Abstract
Polarographic, voltammetric and rotating ring-disk studies have been used to study the electroreduction of hexavalent molybdenum in aqueous solutions of various pH. In all cases investigated, the formation of adsorbed surface films plays a predominant role in the overall electrochemical behavior. Correlations between the voltammetric and the rotating ring-disk studies on the one hand with the polarographic behavior on the other suggest that Mo(V) and Mo(III) species are the sole electrode products and that the appearance of more than two polarographic waves is most probably the result of surface film formation and does not thefefore reflect the formation of Mo(IV) or Mo(II) species as suggested previously.
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