Electrochemical investigation of oxygen intercalation into La2CuO4+delta phases

In this work the electrochemical intercalation of oxygen in La2CuO4 phases has been studied, Oxygen intercalation has been performed at different anod ic potentials for fixed time in alkaline solution (1 MNaOH) at room tempera ture. The electrochemistry of the phenomena taking place at the oxide-solut ion interface has been investigated by cyclic voltammetry (CV), controlled- potential coulometry, and electrochemical impedance spectroscopy (EIS), The homogeneity of processed samples and the lattice parameters prior to and a fter oxygen intercalation have been verified by X-ray powder diffraction, S EM has been used to relate surface modification to the potential applied af ter electrochemical oxygen intercalation, The recent theories and knowledge of mechanisms of oxygen intercalation into the oxide lattice have been rel ated to the experimental results. Oxygen intercalation seems to occur at po tentials slightly lower than that of the oxygen evolution reaction (OER) an d proceeds on a parallel pathway to O-2 evolution at more anodic potentials , 1999 Academic Press.