To develop electrocatalysts with high electrochemical activity and performance comparable to platinum for the hydrogen evolution reaction, γ-Fe₂O₃ magnetic nanoparticles were initially synthesized. Subsequently, γ-Fe₂O₃@APTES and the heterogeneous electrocatalyst γ-Fe₂O₃@APTES@Ru(salenac)Cl were prepared. The structure and characterization of the synthesized nanomaterials were examined using various techniques, including Field Emission Scanning Electron Microscopy (FE-SEM), Transmission Electron Microscopy (TEM), Fourier Transform Infrared Spectroscopy (FT-IR), and X-ray Diffraction (XRD). The electrochemical performance of the synthesized electrocatalyst for the hydrogen evolution reaction was eva‎luated in both acidic (0.5 M sulfuric acid) and alkaline (0.1 M potassium hydroxide) environments using linear sweep voltammetry, cyclic voltammetry, electrochemical impedance spectroscopy, and chronoamperometry. The linear sweep voltammetry results indicated that the γ-Fe₂O₃@APTES@Ru(salenac)Cl electrocatalyst exhibited the highest electrochemical activity for the hydrogen evolution reaction in both acidic and alkaline environments. The stability of this electrocatalyst was assessed after 1000 cycles of cyclic voltammetry and through chronoamperometric measurements in both acidic and alkaline environments, demonstrating good stability. According to the Tafel curve results, the γ-Fe₂O₃@APTES@Ru(salenac)Cl electrocatalyst in an acidic environment showed a Tafel slope of 71 mV/dec and an overpotential of -151 V at a current density of 10 mA/cm². In an alkaline environment, the Tafel slope was 129 mV/dec, with an overpotential of -367 V at the same current density.

اسماعيل حيدري

مهدي هاتفي اردكاني

محمد تقي جعفري , محمدمحسن مومني هامانه