Investigation of electrochemical synthesis temperature effect of the binary transition metals sulfide on nickel foam in water oxidation study

In this work, nickel foam electrode has been used as a substrate for electrochemical synthesis of the binary transition metals sulfide such as nickel and cobalt. Studies showed that the temperature of electrochemical synthesis of binary sulfides has a great effect on their structure and behavior. Therefore, electrochemical synthesizes were performed at different temperatures from 30 to 80 degrees C and different concentrations of Thioacetamide. Modified electrodes with NiCo2S4 nanosheet arrays at different temperatures and concentrations were used for oxygen evolution reaction (OER). By using the proposed method, the onset potential for oxidation of water was significantly reduced to 1.42 V versus RHE electrode, and a current density of 10 mA cm(-2) was obtained at a scanning rate of 50 mV s(-1). Tafel slope of the modified electrode was calculated 26 mV.dec(-1). This study was performed in KOH 0.1 M electrolyte using linear sweeping voltammetry. Also, to describe the characteristics and morphology of the synthesized modifier, the electrode surface was examined by scanning electron microscopy, energy-dispersive X-ray, transmission electron microscopy, and X-ray diffraction.