Electrodeposited CrMnFeCoNi Oxy-carbide film and effect of selective dissolution of Cr on oxygen evolution reaction  

作　　者：Tian Xiao Chenghua Sun Rongguang Wang 

机构地区：[1]Graduate School of Science and Technology,Hiroshima Institute of Technology,Hiroshima,Japan [2]Faculty of Science,Engineering and Technology,Swinburne University of Technology,Hawthorn,Australia [3]Department of Mechanical Systems Engineering,Hiroshima Institute of Technology,Hiroshima,Japan

出　　处：《Journal of Materials Science & Technology》2024年第33期176-184,共9页材料科学技术(英文版)

基　　金：supported by the JSPS KAKENHI(Grant No.JP21K04724);the Iketani Science and Technology Foundation(No.0331126-A).

摘　　要：High entropy compounds were proven to exhibit excellent catalytic activity.Here,a series of amorphous CrMnFeCoNi Oxy-carbide films were successfully synthesized by one-step electrodeposition.As demonstrated,the film presented superior electrocatalytic activity for oxygen evolution reaction(OER)with an overpotential of 295 mV at a current density of 10 mA/cm2.Uniquely,selective dissolution of Chromium(Cr)was observed,which increased the catalytic activity and showed high stability under a large current density of up to 400 mA/cm2.Cr dissolution not only increased the surface area but also improved the conductivity due to newly formed metal-metal bonding,promoting electron transfer and improving OER performance.As revealed by density functional theory(DFT)calculations,Cr-dissolution mediates the bonding of OER intermediates over surface active sites and ultimately reduces OER overpotential.The one-step electrodeposition method and the micro-dissolution mechanism provided a potential way to design and prepare high entropy compound electrodes,aiming to achieve efficient water electrolysis.

关 键 词：High entropy compound ELECTRODEPOSITION Selective dissolution Oxygen evolution reaction Density functional theory 

分 类 号：O64[理学—物理化学]