The Cu1-xCoxO(0.02≤x≤0.14) composite oxide electrodes are prepared by reactive DC magnetron sputtering. Techniques of X-ray diffraction (XRD)

energy-dispersive spectrometry (EDS) and scanning electron microscope (SEM) are adopted to confirm the crystal structure

chemical composition and surface morphology of deposits. The electrochemical characteristics of deposits are further explored by cyclic voltammetry (CV)

linear sweep voltammetry (LSV) and electrochemical impedance spectroscopy (EIS).The XRD spectrum analysis shows that the deposits have a CuO monoclinic crystal structure without appearance of cobalt oxide isolated phase. Based on the electrochemical study

the Cu1-xCoxO electrode exhibits better catalytic activity than CuO and Co3O4 electrodes for oxygen evolution reaction (OER).The increase in OER activity of the Cu1-xCoxO electrode is attributed to its better catalysis

enlarged surface roughness and decreased resistance according to the results of electrochemical analysis together with SEM. Moreover

the power of 45 W (Co)-100 W (Cu) is chosen for the best conditions to prepare the deposits.