Kinetics study of hydrogen evolution reaction on a high porous three dimensional NiPC alloy

A high porous three-dimensional structure of ternary NiPC alloy (۳D-NiPC) was prepared with a simple, cheap, and efficient method called dynamic hydrogen bubble template (DHBT) and characterized by means of microstructural and electrochemical techniques with regard to its catalytic effect toward the hydrogen evolution reaction (HER) in an alkaline solution. The electrochemical efficiency of the alloy has been evaluated on the basis of electrochemical data obtained from the steady-state polarization Tafel curves and electrochemical impedance spectroscopy (EIS) in a ۱ M NaOH solution at ۲۹۸ K. The results showed that the three-dimensional structure of NiPC alloy effectively increased its catalytic activity toward the HER. The ۳D-NiPC alloy is characterized by low overpotential at practical high current densities, large real surface area, and double-layer capacitance. Also, the ۳D-NiPC showed very good physical and electrochemical stability. A high roughness factor (three orders of magnitude; Rf=۳۵۵۰), low overpotential at ۲۵۰ mAcm-۲ (η۲۵۰=۱۷۳.۳ mV), and low charge transfer resistance (Rct=۱۰۰ Ωcm۲) were obtained in the best conditions, in ۱ M NaOH at ۲۹۸ K.

کلیدواژه ها:

Hydrogen evolution reaction (HER) ، three-dimensional NiPC alloy ، electrocatalytic activity ، Electrodeposition