Effect Of Co And Ni Addition On Electrocatalytic Performance Of Fe-based Amorphous Alloys

As an important cornerstone of rapid social development,energy has always played an indispensable role.The rapid development of society has also led to a sharp increase in the demand for energy.However,due to the limited reserves of traditional fossil fuels and the environmental pollution problems caused by using them,it has become a trend to vigorously develop clean new energy.Hydrogen energy,as one of the most promising alternatives to traditional fossil fuels,has received attention in related fields.The most important method for preparing hydrogen is to electrolyze water,but the high hydrogen evolution and oxygen evolution overpotential limit the rate of electrolysis water reaction.Therefore,finding a high-efficiency electrocatalyst for catalytic electrolysis water reaction is the key problem.In this paper,a series of Fe-Co-P-C and Fe-Ni-P-C amorphous alloy strip samples were prepared by arc melting and melt-spinning method.The compositional and elemental substitutions were investigated for the impact on amorphous forming ability and electrocatalytic properties.The main research contents are as follows:(1)A series of Fe_80-xCo_xP₁₃C₇(x=10,20,30,40,50,60 at.%)and Fe_80-xNi_xP₁₃C₇(x=10,20,30,40,50,60 at.%)were prepared by arc melting and melt-spinning.Samples of alloy strips and Fe₄₀Co₄₀P₁₃C₇ alloy samples at different speeds were tested by XRD and DSC.The results show that the alloy samples can form amorphous structure in a large range of compositions.In the comparison of XRD and DSC results of different alloy samples,the amorphous forming ability of Fe₇₀Co₁₀P₁₃C₇ and Fe₇₀Ni₁₀P₁₃C₇amorphous alloy samples is the best.In the comparison of the results of Fe₄₀Co₄₀P₁₃C₇ amorphous alloy samples prepar ed at different rotational speeds,the amorphous forming ability of the samples was best wh en the rotational speed was 2100 r/min.(2)The electrocatalytic hydrogen and oxygen evolution properties of Fe_80-xCo_xP₁₃C₇(x=10,20,30,40,50 at.%)amorphous alloy samples were tested in acid and alkali solutions respectively.The results show that with the increase of Co content,the electro-catalytic oxygen evolution performance gradually becomes better,among which the Fe₃₀Co₅₀P₁₃C₇amorphous alloy sample shows the highest catalytic activity for oxygen evolution,while the electro-catalytic hydrogen evolution performance does not show a linear relationship with composition changes,and may be affected by metastable state of amorphous structure,among which the Fe₇₀Co₁₀P₁₃C₇amorphous alloy sample shows the highest catalytic activity for hydrogen evolution.(3)The electrocatalytic hydrogen and oxygen evolution properties of Fe_80-xNi_xP₁₃C₇(x=10,20,30,40 at.%)amorphous alloy samples were tested in acid and alkali solutions,respectively.The results show that with the increase of Ni content,the electrocatalytic oxygen evolution performance gradually becomes better.Among them,the Fe₄₀Co₄₀P₁₃C₇amorphous alloy sample shows the highest catalytic activity for oxygen evolution,while the electrocatalytic hydrogen evolution performance gradually becomes worse.The Fe₇₀Co₁₀P₁₃C₇ amorphous alloy sample shows the highest catalytic activity for hydrogen evolution.By comparing the results,we found that the Co and Ni elements have a better influence on the electrocatalytic oxygen evolution performance of the whole amorphous alloy system than the Fe element,but the hydrogen evolution catalytic activity of the alloy system is deteriorated.