Abstract
Electrochemical oxidation is depicted as a novel and powerful method for preparing oxides with high oxidation states of transition metals. The reaction is achieved at room temperature, in air, in a solution of 1 N KOH, on dense ceramics of the starting material. This process has been used for preparing fully oxidized SrMO 3 (M=Fe, Co) perovskites and La 2NiO 4+ δ and La 2− x A x CuO 4+ δ (A=Nd) materials with high values of δ (0.25 and 0.09 respectively). It is shown that the electroc hemical reaction is a bulk process which likely implies a mixed valence of the oxygen (O 2-/O -). Evidences for the presence of O - species are given; charge transfer transition metal oxides are highly required.
Published Version
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