Structural features of the electrode/solution interface at the reduction of Cr3+(aq) cations on liquid mercury and solid indium electrodes in acidic media

Characteristics of electroreduction of Cr³⁺ and Cr²⁺ ions on the dropping mercury (literature data) and indium cathodes are analyzed as a function of pH of the medium. A hypothesis that polymeric hydroxocompounds of chromium, which are present in different aggregate states, represent the main or partial reactants in the $ Crleft( {III} right)xrightarrow{{ + e}}Crleft( {II} right)xrightarrow{{ + 2e}}Cr Characteristics of electroreduction of Cr³⁺ and Cr²⁺ ions on the dropping mercury (literature data) and indium cathodes are analyzed as a function of pH of the medium. A hypothesis that polymeric hydroxocompounds of chromium, which are present in different aggregate states, represent the main or partial reactants in the stages is additionally substantiated. Original Russian Text ? V.N. Korshunov, V.A. Safonov, L.N. Vykhodtseva, 2008, published in Elektrokhimiya, 2008, Vol. 44, No. 3, pp. 275–285.