Electrochemical and Electrocatalytic Behavior of an Iron‐Base Amorphous Alloy in Alkaline Solutions at 70°C

Publisher Website
Google Scholar
Abstract
An alloy exhibiting high electrocatalytic activity for the hydrogen evolution reaction (HER) has been prepared by anodic oxidation of amorphous in 30 weight percent (w/o) at 70°C. Electrochemical studies show that the anodic process involves a dissolution‐precipitation mechanism for the Fe(II) species. Surface studies by SEM, EDX, AES, and x‐ray diffraction reveal that the electrode produced is covered by a thick and porous film of . At the beginning of the HER, the oxidized electrode is reduced and fine Fe particles are formed on the amorphous matrix. It is suggested that the reduction mechanism involves also a dissolution‐precipitation process. The iron particles grow and coalesce during the first thousand seconds, producing a highly porous material. After anodic oxidation at 1 mA cm−2 and hydrogen evolution of 104s at −1.3V, the Tafel slope is 77 mV and the exchange current density is 2.3 mA cm−2 in 30 w/o , 70°C.

This publication has 0 references indexed in Scilit: