Investigation of the catalytic effect of metal-metal oxide structure in the catalysts used in hydrogen production by electrolysis of water

Hydrogen, which is obtained by water splitting using the electrolysis method, is one of the cleanest and most environmentally friendly energy carriers. However, since this production method is expensive, it is not preferred in industrial hydrogen production. Researchers working on this subject have intensified their studies to reduce costs. One of the most important factors determining the cost is the development of effective and inexpensive cathode and anode materials. In this study, the catalysts obtained by electrochemical deposition of nickel on the graphite rod, cobalt oxide using the drag effect and electrochemical platinum deposition on it, were used as the cathode material. The surface characterizations of the obtained catalysts were carried out using SEM and XRD techniques. The electrochemical properties of the catalysts were analyzed using electrochemical impedance spectroscopy, linear sweep voltammetry and potentiodynamic polarization methods. It was determined that the most effective nickel deposition time is 10 seconds, CoO content is 1.9 mg and platinum deposition time is 45 seconds. The initial potential for the hydrogen evolution reaction of the catalyst which has the highest catalytic efficiency was 75 mV and current density was determined as 500 mA cm-2 at the cathodic 0.5 VSHE overvoltage.