P-035

Gintautas Jonkus

gintautas.jonkus@gmc.stud.vu.lt

Ramunas Levinas, Natalia Tsyntsaru , Henrikas Cesiulis

Department of Physical Chemistry, Vilnius University, Lithuania

Electrochemical synthesis and characterisation of copper oxides/hydroxides

Metal oxides/hydroxides exhibit significant potential in various scientific areas, from organic catalysis, carbon dioxide reduction to energy storage. Due to copper's accesability and abundance this material is widelly researched. In our study we have synthesized copper hydroxide (Cu(OH)₂), cuprous oxide (Cu₂O) and cupric oxide (CuO) thin films on both porous and non-porous copper electrodes using cyclic voltammetry and observed different current tendencies and potential shifts. We have characterized synthesis process using electrochemical impedance spectroscopy (EIS) and noted regions in which copper oxides/hydroxides are produced and regions in which electrode shows capacitive behaviour and have used EIS to calculate the capacitance of electric double layer. X-ray diffraction has been used to determine the phases of synthesized thin films, we have observed that increasing of upper vertex potential does favour CuO formation and we have noted that on the porous copper electrode we have obtained single CuO phase at more anodic potential than on film. Crystallite sizes were obtained from x-ray diffraction data the smallest crystallites were obtained at 0.65V at both porous and non-porous electrodes the size of crystallites: 10.9nm on the foil and 9.1nm on foam. Scanning electron microscopy has been used to investigate morphology of synthesised nanostructures. Tunable synthesis contained in this study could be used to obtain thin films, which shows promise in various areas.