Fabrication Of FeCo-based Amorphous Film And Their Electrocatalytic Activities For Oxygen Evolution Reaction

Hydrogen,with high energy density,sustainable utilization and zero greenhouse gas emissions impact as the combustion products,has been considered as ideal energy carrier in the field of new energy.Electrolytic water to produce hydrogen is a highly efficient and practical method.However,the anodic oxygen evolution reaction（OER）that occurs during water splitting is an especially sluggish and complicated process,which involves a sequential four electron transfer.And thus tends to limit the efficiency of water splitting to a greater extent.To date,noble metal oxides（such as Ir O₂ and Ru O₂）have exhibited the best OER electrocatalytic properties,although the widespread industrial applications of these materials for electrolytic water splitting have been seriously hindered by their high price and scarcity.In this dissertation,a series of electrocatalysts based on Fe Co based amorphous alloy film materials have been successfully prepared by magnetron sputtering technique without any substrate cooling systems,and the preparation process was simplified.Firstly,we successfully prepared Fe₄₀Co₄₀P₂₀ amorphous alloy film catalysts by magnetron sputtering technology,and systematically discussed the influence of different substrate temperatures on the electrocatalytic property of Fe₄₀Co₄₀P₂₀ amorphous film catalyst.The results showed that Fe₄₀Co₄₀P₂₀amorphous film catalyst has excellent catalytic activity and good stability in 1.0 M KOH alkaline solution.The overpotentials corresponding to the catalysts are 300 m V（as prepared）,304 m V(T_sub=447k)and 324m V(T_sub=589k)to deliver a current density of 10 m Acm^-2,the corresponding Tafel slope is only 28.0m Vdec^-1、30.2 m Vdec^-1、44.6 m Vdec^-1,which indicates that the overpotential of Fe₄₀Co₄₀P₂₀ amorphous film prepared under unheated condition is the lowest and the catalytic performance is the better.In addition,we successfully prepared Fe_80-xCo_xP₁₃C₇ amorphous alloy film catalysts by magnetron sputtering technique,and systematically discussed the effect of Co element substitution on the electrocatalytic performance of Fe_80-xCo_xP₁₃C₇ amorphous alloy film catalysts.The experimental results showed that the amorphous alloy thin film catalysts of Fe_80-xCo_xP₁₃C₇ has excellent electrocatalytic performance and maintained excellent stability for 20h 1.0M KOH solution.Increases in the Co concentration improved the electrocatalytic activity,and the Co₈₀P₁₃C₇ film catalyst produced a low overpotential of approximately 301 m V at 10 m A cm^-2,with a low Tafel slope of approximately 27.2 m V dec^-1.When the current density is 10 m Acm^-2,the overpotential of Fe₈₀P₁₃C₇ film catalyst required is 408 m V,with a Tafel slope of approximately 40.7 m Vdec^-1.Finally,the electrocatalytic oxygen evolution performance of Fe₄₀Co₄₀P₁₃C₇amorphous alloy film catalyst under different preparation parameters was systematically studied by magnetron sputtering system.The experimental results showed that the electrocatalytic oxygen evolution performance of Fe₄₀Co₄₀P₁₃C₇ amorphous alloy film catalyst sputtered on carbon fiber paper was not significantly affected by different deposition rates and film thicknesses.Comparison of catalytic properties of samples under different preparation processes,the Fe₄₀Co₄₀P₁₃C₇film produced a low overpotential of approximately 323m V at 10 m Acm^-2,while the Fe₄₀Co₄₀P₁₃C₇ribbon reached a overpotential of approximately 358m V at 10m Acm^-2.It can be concluded that Fe₄₀Co₄₀P₁₃C₇ amorphous alloy film catalyst has better catalytic oxygen evolution activity.This is due to the thermodynamically metastable amorphous film materials combined with excellent electrical conductivity of carbon fiber paper can expose a higher concentration of active sites and unsaturated coordination centers,thus showing excellent electrocatalytic oxygen evolution activity.