Using interface engineering,a highly efficient catalyst with a shell@core structure was successfully synthesized by growing an amorphous material composed of Ni,Mo,and P on Cu nanowires(Ni-MoP@CuNWs).This catalyst onl...Using interface engineering,a highly efficient catalyst with a shell@core structure was successfully synthesized by growing an amorphous material composed of Ni,Mo,and P on Cu nanowires(Ni-MoP@CuNWs).This catalyst only requires an overpotential of 35 mV to reach a current density of 10 mA cm^(-2).The exceptional hydrogen evolution reaction(HER)activity is attributed to the unique amorphous rod-like nature of NiMoP@CuNWs,which possesses a special hydrophilic feature,en-hances mass transfer,promotes effective contact between the electrode and electrolyte solution,and exposes more active sites during the catalytic process.Density functional theory revealed that the introduction of Mo weakens the binding strength of the Ni site on the catalyst surface with the H atom and promotes the desorption process of the H_(2)product significantly.Owing to its facile syn-thesis,low cost,and high catalytic performance,this electrocatalyst is a promising option for com-mercial applications as a water electrolysis catalyst.展开更多
The electrolysis of water powered by renewable energy sources offers a promising method of"green hydrogen"production,which is considered to be at the heart of future carbon-neutral energy systems.In the past...The electrolysis of water powered by renewable energy sources offers a promising method of"green hydrogen"production,which is considered to be at the heart of future carbon-neutral energy systems.In the past decades,researchers have reported a number of hydrogen evolution reaction(HER)electrocatalysts with activity comparable to that of commercial Pt/C,but most of them are tested within a small current density range,typically no more than 500 mA cm^(-2).To realize the industrial application of hydrogen production from water electrolysis,it is essential to develop high-efficiency HER electrocatalysts at high current density(HCD≥500 mA cm^(-2)).Nevertheless,it remains challenging and significant to rational design HCD electrocatalysts for HER.In this paper,the design strategy of HCD electrocatalysts is discussed,and some HCD electrocatalysts for HER are reviewed in seven categories(alloy,metal oxide,metal hydroxide,metal sulfide/selenide,metal nitride,metal phosphide and other derived electrocatalysts).At the end of this article,we also pro-pose some viewpoints and prospects for the future development and research directions of HCD electrocatalysts for HER.展开更多
二维金属性过渡金属硫属化合物(metal transition metal dichalcogenides,MTMDCs)由于其独特的物性(如电荷密度波相转变、超导和磁性等),以及在先进纳米电子学和能源相关领域的应用潜力而受到研究者的广泛关注.为了实现基本物性研究和...二维金属性过渡金属硫属化合物(metal transition metal dichalcogenides,MTMDCs)由于其独特的物性(如电荷密度波相转变、超导和磁性等),以及在先进纳米电子学和能源相关领域的应用潜力而受到研究者的广泛关注.为了实现基本物性研究和多方面的应用探索,化学气相沉积(CVD)技术被引入到高质量二维MTMDCs材料的制备中,成功地合成了厚度可调的超薄MTMDCs纳米片、大面积均匀的超薄薄膜、垂直取向的纳米片阵列和高质量的纳米片粉体等.CVD方法可以兼顾大畴区、层厚可调和高晶体质量的材料制备需求,还能与目前的半导体工艺相兼容,因而受到人们广泛关注.二维MTMDCs材料具有高的电导率,可以作为单层/少层半导体性过渡金属硫属化合物(transition metal dichalcogenides,TMDCs)的电极材料,改善晶体管器件的电极接触,从而提升器件性能.此外,二维MTMDCs纳米片也可作为高效的催化剂应用于电化学析氢反应,其催化性能显著优于单层/少层MoS2等半导体性TMDCs催化剂.本文综述了二维MTMDCs材料的CVD制备方法和新奇物理特性,以及其在场效应晶体管、电催化析氢应用中的研究进展;最后讨论了相关领域存在的问题和未来发展方向.展开更多
文摘Using interface engineering,a highly efficient catalyst with a shell@core structure was successfully synthesized by growing an amorphous material composed of Ni,Mo,and P on Cu nanowires(Ni-MoP@CuNWs).This catalyst only requires an overpotential of 35 mV to reach a current density of 10 mA cm^(-2).The exceptional hydrogen evolution reaction(HER)activity is attributed to the unique amorphous rod-like nature of NiMoP@CuNWs,which possesses a special hydrophilic feature,en-hances mass transfer,promotes effective contact between the electrode and electrolyte solution,and exposes more active sites during the catalytic process.Density functional theory revealed that the introduction of Mo weakens the binding strength of the Ni site on the catalyst surface with the H atom and promotes the desorption process of the H_(2)product significantly.Owing to its facile syn-thesis,low cost,and high catalytic performance,this electrocatalyst is a promising option for com-mercial applications as a water electrolysis catalyst.
文摘The electrolysis of water powered by renewable energy sources offers a promising method of"green hydrogen"production,which is considered to be at the heart of future carbon-neutral energy systems.In the past decades,researchers have reported a number of hydrogen evolution reaction(HER)electrocatalysts with activity comparable to that of commercial Pt/C,but most of them are tested within a small current density range,typically no more than 500 mA cm^(-2).To realize the industrial application of hydrogen production from water electrolysis,it is essential to develop high-efficiency HER electrocatalysts at high current density(HCD≥500 mA cm^(-2)).Nevertheless,it remains challenging and significant to rational design HCD electrocatalysts for HER.In this paper,the design strategy of HCD electrocatalysts is discussed,and some HCD electrocatalysts for HER are reviewed in seven categories(alloy,metal oxide,metal hydroxide,metal sulfide/selenide,metal nitride,metal phosphide and other derived electrocatalysts).At the end of this article,we also pro-pose some viewpoints and prospects for the future development and research directions of HCD electrocatalysts for HER.
文摘二维金属性过渡金属硫属化合物(metal transition metal dichalcogenides,MTMDCs)由于其独特的物性(如电荷密度波相转变、超导和磁性等),以及在先进纳米电子学和能源相关领域的应用潜力而受到研究者的广泛关注.为了实现基本物性研究和多方面的应用探索,化学气相沉积(CVD)技术被引入到高质量二维MTMDCs材料的制备中,成功地合成了厚度可调的超薄MTMDCs纳米片、大面积均匀的超薄薄膜、垂直取向的纳米片阵列和高质量的纳米片粉体等.CVD方法可以兼顾大畴区、层厚可调和高晶体质量的材料制备需求,还能与目前的半导体工艺相兼容,因而受到人们广泛关注.二维MTMDCs材料具有高的电导率,可以作为单层/少层半导体性过渡金属硫属化合物(transition metal dichalcogenides,TMDCs)的电极材料,改善晶体管器件的电极接触,从而提升器件性能.此外,二维MTMDCs纳米片也可作为高效的催化剂应用于电化学析氢反应,其催化性能显著优于单层/少层MoS2等半导体性TMDCs催化剂.本文综述了二维MTMDCs材料的CVD制备方法和新奇物理特性,以及其在场效应晶体管、电催化析氢应用中的研究进展;最后讨论了相关领域存在的问题和未来发展方向.
