STUDY ON AMORPHOUS NI-MO-FE-ZN COATING ELECTROCATALYST FOR HYDROGEN EVOLUTION IN ALKALINE-SOLUTION

Amorphous Ni-Mo-Fe-Zn quaternary alloy coatings are developed by means of electrodeposit, and after most of zinc is leached out their electr ocatalytic activity toward the hydrogen evolution reaction (HER) in al kaline media is studied using electrochemical polarization and a.c. im pedance techniques. The results show these coatings have very high ele ctrocatalytic activity and excellent stability. This might benefit fro m the increased active surface area, well-pronounced synergism as well as their amorphous structures. The HER proceeds through the Volmer-He yrovsky mechanism with a rate-determination-step (RDS) of Volmer at hi gh overpotentials and the HER is controlled by Heyrovsky in lower over potential areas.