Water electrolysis is one of the best methods for high purity Hydrogen (and Oxygen) production. Nomerous studies have been devoted on the investigation of HER catalysts improvment. Using non precious and durable electrocatalysts with low overpotential and high activity instead of noble metals is one of the most investigated subjects. In this project, nickel nano particles and its alloys (NiCo and NiFeCo) have been grown on the reduced graphene oxide support and deposited on Ni foam substrate to employ as HER catalyst. The structures of these catalysts were investigated by various techniques such as FT-IR, EDS, Raman, XRD, SEM and TEM. These thechniques showed that applied method for synthesis of a porous and homogeneous elctrocatalaysts was successful. To evaluate the electrochemical behavior of these nano catalysts, various techniques such as cyclic voltammetry, linear sweep voltammetry were apllied. The electrocatalitic activity of Ni/rGO, NiCo/rGO and NiCoFe/rGo were improved after 500 CV cycles. Observed onset overpotential of NiCo/rGO and NiCoFe/rGO would be -57 mV and -55 mV, respectively. NiCo/rGo show high exchange current density, 0.295 mA cm -2 . Finally, to study the performance of these nano particles under real conditions, an alkaline electrolysis cell was used. NiCo/rGO and NiCoFe/rGO exhibited the cell voltage 1.8 and 1.9 V, respectively at the current density of 200 mA cm -2 .
