Nanostructured amorphous Fe29Co27Ni23Si9B12 high-entropy-alloy:an efficient electrocatalyst for oxygen evolution reaction
来源期刊:JOURNAL OF MATERIALS SCIENCE TECHNOLOG2021年第9期
论文作者:Hongyan Wang Ran Wei Xiumin Li Xuli Ma Xiaogang Hao Guoqing Guan
文章页码:191 - 198
摘 要:Proximal configu ration of dissimilar metal atoms in amorphous high-entropy-alloys(HEAs) always re sult in interatomic d-band ligand effect,dense defect distribution,coordinatively unsaturated sites,high potential energy,and loose atom bonding.Herein,nanostructured amorphous Fe29CO27Ni23Si9 B12 HEA ribbon is fabricated via a melt spinning method combined with electrochemical corrosion etching process,which is applied as the potential oxygen evolution reaction electrocatalyst.It is found that there are micro/nano pits on the surface of etched amorphous Fe29CO27Ni23Si9 B12 ribbons.Various elements of HEAs bond with each other to form a highly disordered configu ration,which could result in an optimized bonding energy and enhanced intrinsic catalytic activity.The electrocatalysis activity measurements indicate that the amorphous HEA endows a much higher activity than the crystalline one,which is further improved by the electrochemical etching treatment.Especially,the HEA ribbon etched for 3 h requires a low overpotential of 230 mV to afford 10 mA cm-2 current density.In addition,density functional theory calculations demonstrate that the amorphous structure can weaken the interaction between the surface of Fe29CO27Ni23Si9 B12 alloy and the intermediates,leading to an optimized adsorption Gibbs free energy.
Hongyan Wang1,Ran Wei1,Xiumin Li1,Xuli Ma2,Xiaogang Hao3,Guoqing Guan4
1. School of Materials Science and Engineering, Zhengzhou University2. Department of Environmental Science and Engineering, Taiyuan University of Technology3. Department of Chemical Engineering, Taiyuan University of Technology4. Energy Conversion Engineering Laboratory, Institute of Regional Innovation, Hirosaki University
摘 要:Proximal configu ration of dissimilar metal atoms in amorphous high-entropy-alloys(HEAs) always re sult in interatomic d-band ligand effect,dense defect distribution,coordinatively unsaturated sites,high potential energy,and loose atom bonding.Herein,nanostructured amorphous Fe29CO27Ni23Si9 B12 HEA ribbon is fabricated via a melt spinning method combined with electrochemical corrosion etching process,which is applied as the potential oxygen evolution reaction electrocatalyst.It is found that there are micro/nano pits on the surface of etched amorphous Fe29CO27Ni23Si9 B12 ribbons.Various elements of HEAs bond with each other to form a highly disordered configu ration,which could result in an optimized bonding energy and enhanced intrinsic catalytic activity.The electrocatalysis activity measurements indicate that the amorphous HEA endows a much higher activity than the crystalline one,which is further improved by the electrochemical etching treatment.Especially,the HEA ribbon etched for 3 h requires a low overpotential of 230 mV to afford 10 mA cm-2 current density.In addition,density functional theory calculations demonstrate that the amorphous structure can weaken the interaction between the surface of Fe29CO27Ni23Si9 B12 alloy and the intermediates,leading to an optimized adsorption Gibbs free energy.
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