As the cleanest energy source,hydrogen energy is regarded as the most promising fuel.Water electrolysis,as the primary means of hydrogen production,has constantly been the focus of attention in the energy conversion f...As the cleanest energy source,hydrogen energy is regarded as the most promising fuel.Water electrolysis,as the primary means of hydrogen production,has constantly been the focus of attention in the energy conversion field.Developing eco-friendly,cheap,safe and efficient catalysts for electrochemical water splitting(EWS)is the key challenge.Herein,the intermetallic silicide alloy is first synthesized via a facile magnesiothermic reduction and employed as bifunctional electrocatalysts for EWS.Ferric-nickel silicide(denoted as FeNiSi)alloy is designed and shows a good electrocatalytic performance for EWS.The lattice distortions of FeNiSi enhance the electrocatalytic activity.Besides,the porous structure affords more active sites and improves the reaction kinetics.As a consequence,FeNiSi delivers an excellent performance with overpotential of 308 mV for oxygen evolution reaction(OER)and 386 mV for hydrogen evolution reaction(HER)at 10 mA·cm−2 in 1 M KOH.The stability structure of intermetallic silicide achieves an outstanding durability with an unchanged potential of 1.66 V for overall water splitting at 10 mA·cm−2 for 15 h.This work not only provides a facile method for the synthesis of intermetallic silicide with considerable porous structures,but also develops the potential of intermetallic silicide alloy as bifunctional electrocatalysts for EWS,which opens up a new avenue for the design and application of intermetallic silicide alloy.展开更多
Layered materials with adjustable framework,as the most potential cathode materials for aqueous rechargeable zinc ion batterie,have high capacity,permit of rapid ion diffusion,and charge transfer channels.Previous stu...Layered materials with adjustable framework,as the most potential cathode materials for aqueous rechargeable zinc ion batterie,have high capacity,permit of rapid ion diffusion,and charge transfer channels.Previous studies have widely investigated their preparation and storage mechanism,but the intrinsic relationship between the structural design of layered cathode materials and electrochemical performance has not been well established.In this work,based on the first principles calculations and experiments,a crucial strategy of pre-intercalated metalions in vanadium oxide interlayer with administrable p-band center(ε_(p))of O is explored to enhance Zn^(2+)storage.This regulation of the degree of covalent bond and the average charge of O atoms varies the binding energy between Zn^(2+)and O,thus affecting the intercalation/de-intercalation of Zn2þ.The present study demonstrates thatεp of O can be used as an important indicator to boost Zn2þstorage,which provides a new concept toward the controlled design and application of layered materials.展开更多
基金the Natural Science Foundation of Liaoning Province(No.2023-MS-115)and Large Instrument and Equipment Open Foundation of Dalian University of Technology.
文摘As the cleanest energy source,hydrogen energy is regarded as the most promising fuel.Water electrolysis,as the primary means of hydrogen production,has constantly been the focus of attention in the energy conversion field.Developing eco-friendly,cheap,safe and efficient catalysts for electrochemical water splitting(EWS)is the key challenge.Herein,the intermetallic silicide alloy is first synthesized via a facile magnesiothermic reduction and employed as bifunctional electrocatalysts for EWS.Ferric-nickel silicide(denoted as FeNiSi)alloy is designed and shows a good electrocatalytic performance for EWS.The lattice distortions of FeNiSi enhance the electrocatalytic activity.Besides,the porous structure affords more active sites and improves the reaction kinetics.As a consequence,FeNiSi delivers an excellent performance with overpotential of 308 mV for oxygen evolution reaction(OER)and 386 mV for hydrogen evolution reaction(HER)at 10 mA·cm−2 in 1 M KOH.The stability structure of intermetallic silicide achieves an outstanding durability with an unchanged potential of 1.66 V for overall water splitting at 10 mA·cm−2 for 15 h.This work not only provides a facile method for the synthesis of intermetallic silicide with considerable porous structures,but also develops the potential of intermetallic silicide alloy as bifunctional electrocatalysts for EWS,which opens up a new avenue for the design and application of intermetallic silicide alloy.
基金Ziyi Feng is now pursuing her Doctor degree in the School of Dalian University of Technology.She current research interest mainly lies in the aqueous Zn-ion batteriesCorresponding author:Yifu Zhang works in School of Chemistry at Dalian University of Technology(DUT).He received his Bachelor's degree(2008)and Ph.D.degree(2013)from Wuhan University.During 2018.12-2019.12,he worked with Prof.John Wang as a visiting scholar at the Department of Materials Science and Engineering,National University of Singapore.His current research focuses on vanadium oxides,silicates and their carbon composites for energy storage and conversation including supercapacitors,aqueous Zn-ion batteries,and oxygen evolution reaction.He has published more than 200 papers in peerreviewed journals.He is selected as Elsevier China Highly Cited Scholarand RSC Highly Cited Top 1%,E-mail addresses:yfzhang@dlut.edu.cnCorresponding author:Tao Hu,E-mail addresses:inorchem@dlut.edu.cn。
文摘Layered materials with adjustable framework,as the most potential cathode materials for aqueous rechargeable zinc ion batterie,have high capacity,permit of rapid ion diffusion,and charge transfer channels.Previous studies have widely investigated their preparation and storage mechanism,but the intrinsic relationship between the structural design of layered cathode materials and electrochemical performance has not been well established.In this work,based on the first principles calculations and experiments,a crucial strategy of pre-intercalated metalions in vanadium oxide interlayer with administrable p-band center(ε_(p))of O is explored to enhance Zn^(2+)storage.This regulation of the degree of covalent bond and the average charge of O atoms varies the binding energy between Zn^(2+)and O,thus affecting the intercalation/de-intercalation of Zn2þ.The present study demonstrates thatεp of O can be used as an important indicator to boost Zn2þstorage,which provides a new concept toward the controlled design and application of layered materials.
