فهرست نشریات علمی دسترسی آزاد ایران

In this study ternary Ni-P-CeO 2 catalysts were first synthesized by the Co-electrodeposition method on a copper substrate and then characterized by means of microstructural and electrochemical techniques toward a hydrogen evolution reaction (HER). Also, for comparison other catalysts such as Ni-CeO 2 , Ni-P, and Ni were prepared and characterized by the same methods. The microstructure of the investigated catalysts was characterized by scanning electron microscopy (SEM) coupled with energy dispersive X-ray spectrometry (EDX) and X-ray diffraction (XRD) methods. The electrochemical efficiency of all investigated catalysts was studied based on electrochemical data obtained from electrochemical impedance spectroscopy (EIS) and steady-state polarization Tafel curves in 1 M NaOH solution. The results showed that microstructural properties play an essential role in the high electrocatalytic activity of Ni-P-CeO 2 . Furthermore, it was observed that the HER mechanism for all investigated systems was Volmer-Heyrovsky with a Volmer step as the rate determining step (RDS). The Ni-P-CeO 2 catalyst, as the most active catalyst in this work, was characterized by an exchange current density of j 0 =168.0 µAcm -2 , a Tafel slope of b=-162.0 mV.dec -1 , and overpotential at j 0 =250 mAcm -2 ; η 250 =-143.0 mV.