Voltammetric studies of ybaco2o5 in alkaline aqueous solution
University Politehnica of Timisoara, Faculty of Industrial Chemistry and Environmental Engineering, P-ta Victoriei 2, 300006 Timisoara, Romania
Abstract
Electrochemical behaviour of YBaCo2O5 perovskite in alkaline solution was studied during oxygen insertion/release process. In correlation with electrochemical studies was analyzed the compound morphology and structure. Compound electrochemical oxidation consists in intercalation of oxygen atoms in crystalline structure, which is equivalent with a structure compaction. These results were correlated with the Brunauer-Emmett-Teller (BET) surface area of sample and also with SEM pictures. Compaction of Y-112 crystalline structure during electrochemical oxidation leads at some partial irreversible character of studied process. Presence of a chemical step during electrochemical oxidation of studied perovskite was emphasized from electrochemical impedance data. This step was associated with O2-ions formation. Based on the obtained results a mechanism of electrochemical oxidation/reduction of YBaCo2O5 perovskite in alkaline solution was proposed.
Keywords
BET technique; cyclic voltammetry; electrochemical behaviour of YBaCo2O5; mixed oxides; YBaCo2O5