Some Co and Co-X (x = B, s, Fe) composite has high discharge capacity and good cycling stability. Due to Co series materials′ high theoretical specific capacity, they are widely used in electrocatalysis, electrochemical analysis, alkaline battery and super capacitor and other fields. However, the research on Co-X composites is not comprehensive enough, and the properties of some composite materials produced by compounding the metals with Co using some particular methods have not been systematically analyzed. Focused on Co-X (X=Fe, Ni, V) mixed metal oxides, this experiment used one-step hydrothermal method and carried out systematic researches on their oxygen evolution properties.
First of all, the crystal structure and morphology of the material were characterized by powder X-ray diffraction (XRD), and scanning electron microscopy (SEM) analysis with the catalytic current of materials, active surface area and charge transfer resistance, Tafel slope and stability being investigated by linear sweep and cyclic voltammetry (CV), and electrochemical impedance (EIS) test, Tafel test, constant potential test at the mean time. The reaction time of this experiment was fixed to 12h, we then made the material selection for optimal Co-X (X=Fe, Ni, V) composite under the condition of the concentration ratio of 1:1:1 and the reaction temperature of 180 degrees Celsius. Then researches were done by optimizing the reaction temperature and the concentration ratio within the fixed 12h reaction time, the results of which turned out that under the condition of the reaction temperature of 100 DEG C and concentration ratio of 2:1:1, Co:Fe:V composite can exhibit much better catalytic performance and the catalytic current can reach up to 65 mA.