Hydrogen Evolution Reaction on the Oxidized Surfaces of the Fe-Based Amorphous Alloys

Electrochemical hydrogen evolution on oxidized electrodes of the amorphous metallic alloys Fe₈₂Nb₂B₁₄RE₂ (RE = Tb, Dy) in 5.0 M KOH aqueous solution in the temperature range 298-313 ± 0.5 K has been investigated. A sample Fe₈₄Nb₂B₁₄ was used as reference alloy. The highest corrosion resistance during multiple scanning of the potential exhibited the alloys doped by terbium and dysprosium. High values of the exchange currents, characterizing catalytic ability and corrosion resistance characterize Fe₈₂Nb₂B₁₄RE₂ amorphous alloys as promising electrode materials for hydrogen evolution reaction

Hydrogen Evolution Reaction on the Oxidized Surfaces of the Fe-Based Amorphous Alloys

Electrochemical hydrogen evolution on oxidized electrodes of the amorphous metallic alloys Fe₈₂Nb₂B₁₄RE₂ (RE = Tb, Dy) in 5.0 M KOH aqueous solution in the temperature range 298-313 ± 0.5 K has been investigated. A sample Fe₈₄Nb₂B₁₄ was used as reference alloy. The highest corrosion resistance during multiple scanning of the potential exhibited the alloys doped by terbium and dysprosium. High values of the exchange currents, characterizing catalytic ability and corrosion resistance characterize Fe₈₂Nb₂B₁₄RE₂ amorphous alloys as promising electrode materials for hydrogen evolution reaction

Surface structure and catalytic activity of amorphous metallic alloys Fe-Nb-B-RE (RE = Y, Gd, Tb, Dy) in alkaline solution

The thermal stability and characteristics of the surface of the Fe 82 Nb 2 B 14 RE 2 (RE = Y, Gd, Tb, Dy) amorphous alloys were studied by differential scanning calorimetry and atomic force microscopy methods. Alloying of the Fe 84 Nb 2 B 14 alloy by 2 at.% of RE results to increase of nanocrystallization temperature on 110 K for amorphous Fe 82 Nb 2 B 14 RE 2 (RE = Y, Gd, Tb, Dy). Values of the roughness increased after thermal treatment for 1 h in air due to nucleation and growth of nanocrystals in bulk and surface oxidation of the amorphous Fe82Nb2B14RE2 alloys. The nanocrystallization of Fe 82 Nb 2 B 14 RE 2 amorphous alloys after thermal treatment increases the catalytic activity for hydrogen evolution reaction

The Kinetic Peculiarities of the Nanocrystallization of Amorphous Alloys Fe₈₄Nb₂B₁₄, which are Doped by Rare Earth Metals

The thermal stability and crystallization of the Fe82Nb2B14RE2 (RE = Y, Gd, Tb, Dy) amorphous alloys were investigated by differential scanning calorimetric (DSC) method. By X-ray diffraction (XRD) method has been established that the initial AMA have amorphous structure. The RE alloying of Fe82Nb2B14RE2 amorphous alloys increase the nanocrystallization temperatures for ~ 110 K and activation energies of crystallization for ~ 330 kJ/mol. The Avrami constant was found to be 1.86 for Fe84Nb2B14 at 703 K, 1.17 for Fe82Nb2B14Y2 at 813 K, 1.36 for Fe82Nb2B14Gd2 at 808 K, 1.76 for Fe82Nb2B14Tb2 at 808 K and 1.92 for Fe82Nb2B14Dy2 at 808 K. Two-dimensional diffusion controlled growth mechanism with decreasing nucleation rate was observed in the alloys. Keywords: Amorphous alloys; Crystallization; Kinetics models; Activation energy.</span