Hydrogen gas production by electrolysis of water in cobalt-tin coated nickel electrode

In this study, Ni foam (Ni mesh) working electrode, Nickel foam support material purchased from MTI Corporation was used to prepare the cathode electrode. The working electrodes were prepared in the dimensions of Nickel foam 0,16cm x1 cm x 0.5cm (thickness, width, height) with the given properties. To make a coating, the nickel foam was measured 1 cm x 0.5 cm and the rest was wrapped with teflon, passed through pure water and immersed in the coating bath. Coating bath composition Nickel (Ni#Ni) on nickel foam, tin (Sn#Ni) on nickel foam, cobalt (Co#Ni) on nickel foam, tin on nickel foam respectively, cobalt (SnCo#Ni) on nickel foam, respectively nickel, tin, cobalt (NiSnCo#Ni) coatings were made. Coatings were made by using chronopotentiometry technique by applying 5 mA cm-2 (for Sn) and 10 mA cm-2 (for Co and Ni) current for cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), cathodic current curves (Tafel) for characterization of electrodes in 1,0 M KOH solution. ) and linear scanning voltammetry (LSV) techniques were used. Hydrogen growth efficiency was determined by accumulated hydrogen gas. Surface Characterization was done using SEM and EDX. As a result, the SnCo # Ni electrode with the lowest HER overvoltage (0.1911 V) is the electrode capable of producing the most hydrogen with the lowest resistance (2.512 ohm cm2) and the highest current density (110.9 mA cm-2) It has been identified. Keywords: Hydrogen, Cathode, Electrochemical Deposition, Cobalt, Tin, Nickel mesh