In this study, noble metal nanoparticles, including platinum, palladium, an‎d gold, were initially deposited via electrochemical deposition onto the surface of a glassy carbon electrode in an acidic electrolyte using three different voltammetric methods: square wave, sawtooth wave, an‎d triangular wave voltammetry. All electrochemical deposition methods were carried out under identical electrochemical potential conditions. Two electrolytes were used: sulfuric acid (0.1 M) an‎d perchloric acid (0.1 M). By integrating all these parameters, a total of 42 electrocatalysts composed of noble metal nanoparticles were synthesized. The performance of all these electrocatalysts was examined an‎d compared in an acidic environment containing 0.5 M sulfuric acid for the hydrogen evolution reaction. To achieve this, techniques such as linear sweep voltammetry (LSV), cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), an‎d field emission scanning electron microscopy (FE-SEM) were employed. Comparison of the linear sweep voltammetry results for all synthesized electrocatalysts, along with the calculation of the Tafel slope for each an‎d FE-SEM imaging, identified the electrocatalyst composed of platinum an‎d gold deposited in a 0.1 M sulfuric acid electrolyte using triangular wave voltammetry as the best electrocatalyst in this study. It exhibited an overpotential of -31 mV at a current density of 1 mA/cm² an‎d -70 mV at 10 mA/cm². Additionally, based on the recorded linear sweep voltammetry curve, it demonstrated a Tafel slope of 35.3 mV/s with an exchange current density of 0.09068 mA/cm². Keywords: Hydrogen evolution reaction, Electrochemical deposition, Electrocatalyst, Platinum, Palladium, Gold

اسماعيل حيدري , علي اصغر انصافي

حسين فرخ پور

محمدمحسن مومني هامانه , كيومرث زرگوش