Electrocatalytic Oxygen Evolution on Nanoscale Crednerite (CuMnO2) Composite Electrode

摘要

In this study, nanoscale crednerite (CuMnO2) was prepared in the system xCuO - (70-x) MnO - 30SiO(2), where.. has values 10, 15, 20, 25 and 30, via melting quenching glass-ceramic technique. The electrocatalytic activity of the oxygen evolution reaction (OER) on CuMnO2 deposits has been studied in 1.0M KOH (25 degrees C) by means of cyclic voltammetry, linear sweep voltammetry, chronoamperometric and electrochemical impedance techniques. The study has shown that the catalytic activity had increased with the increase of Cu content in the electrode composition, where the optimum improvement in the apparent electrode catalytic activity was obtained at the M30 electrode (with x = 30). At E = 0.6V versus Ag/AgCl, the apparent oxygen evolution current density observed at the M30 electrode is 4 times greater than that observed with M10 (x = 10). The order of the OER with respect to OH- concentration measured at low and high potentials is similar to 1.0 and the roughness of the electrodes was decreased with the increase of the Cu content.