2017年9月,在比利时布鲁塞尔举办的Labelexpo Europe 2017展会同期,隶属于瑞士上市公司COMET集团公司的ebeam Technologies事业部出品的紧凑型固化单元荣获了'2017标签工业全球大奖'4个重量级奖项之一的'可持续发展大奖...2017年9月,在比利时布鲁塞尔举办的Labelexpo Europe 2017展会同期,隶属于瑞士上市公司COMET集团公司的ebeam Technologies事业部出品的紧凑型固化单元荣获了'2017标签工业全球大奖'4个重量级奖项之一的'可持续发展大奖',该奖项表彰了ebeam在研发适用于窄幅轮转印刷机的紧凑型电子束固化系统方面的努力。展开更多
Using first-principles calculations based on density functional theory(DFT), the structural and electronic properties of hydrogenated antimonene have been systematically investigated. Phonon dispersion and molecular d...Using first-principles calculations based on density functional theory(DFT), the structural and electronic properties of hydrogenated antimonene have been systematically investigated. Phonon dispersion and molecular dynamics(MD)simulation reveal that fully hydrogenated(FH) antimonene has high dynamic stability and could be synthesized. A newσ-type Dirac cone related to Sb-px,y orbitals is found in FH antimonene, which is robust to tensile strain. Noticeably, the spin orbital coupling(SOC) opens a quantum spin Hall(QSH) gap of 425 meV at the Dirac cone, sufficiently large for practical applications at room temperature. Semi-hydrogenated antimonene is a non-magnetic metal. Our results show that FH antimonene may have great potential applications in next generation high-performance devices.展开更多
Development of efficient heterostructured photocatalysts that respond to visible light remains a considerable challenge.We herein show the synthesis of ZnIn2S4/carbon quantum dot hybrid photocatalysts with flowerlike ...Development of efficient heterostructured photocatalysts that respond to visible light remains a considerable challenge.We herein show the synthesis of ZnIn2S4/carbon quantum dot hybrid photocatalysts with flowerlike microspheres via a facile solvothermal method.The ZnIn2S4/carbon quantum dot flowerlike microspheres display enhanced photocatalytic and photoelectrochemical activity compared with that of pure ZnIn2S4.With a content of only 0.5 wt%carbon quantum dots,93%of Cr(VI)is reduced under visible‐light irradiation at 40 min.As a co‐catalyst,the carbon quantum dots improve the light absorption and lengthen the lifetime of charge carriers,consequently enhancing the photocatalytic and photoelectrochemical activity.展开更多
This article describes a theory unifying the unusual performance of the undercoordinated adatoms,point defects,terrace edges,surfaces,and nanostructures of various shapes.The ideas of bond order-length-strength correl...This article describes a theory unifying the unusual performance of the undercoordinated adatoms,point defects,terrace edges,surfaces,and nanostructures of various shapes.The ideas of bond order-length-strength correlation and the associated nonbonding electron polarization(BOLS-NEP)feature that bonds between undercoordinated atoms contract spontaneously.Bond contraction raises the local density of charge and energy.Bond strength gain deepens the interatomic potential well to trap the core and bonding electrons deeply.In turn,the locally and densely entrapped electrons polarize those partially occupying the valence band and above pertaining to the lower-coordinated atoms.The BOLS-NEP theory reconciles the unusual behaviors of undercoordinated systems and the size dependency of nanostructures in their lattice oscillating dynamics,mechanical strength,thermal stability,photon emissivity,chemical reactivity,dielectric permeability,associated with generation of polarized Dirac fermions,serving as carriers for extraordinary catalysis,hydrophobicity,fluidity,lubricity,as well as monolayer high-TC superconductivity and topological insulator conductivity.展开更多
Owing to their advantages such as high energy density and excellent cycle performance,lithium-ion batteries have occupied a dominant position for many years in the fields of consumer electronics,energy storage,and new...Owing to their advantages such as high energy density and excellent cycle performance,lithium-ion batteries have occupied a dominant position for many years in the fields of consumer electronics,energy storage,and new energy vehicles.Graphite is the most widely commercialized anode material because of its stable layered structure,excellent electrical conductivity,and cost-effectiveness.However,its inherent limitations,notably its relatively low theoretical specific capacity(372 mAh/g)and sluggish intrinsic ion diffusion kinetics,pose significant challenges to the development of high-energy and power density battery systems.This article briefly introduces the intercalation and failure mechanisms of graphite anode materials,reviews the research progress in the bulk and surface regulation of these materials,and discusses their future development prospects.展开更多
文摘2017年9月,在比利时布鲁塞尔举办的Labelexpo Europe 2017展会同期,隶属于瑞士上市公司COMET集团公司的ebeam Technologies事业部出品的紧凑型固化单元荣获了'2017标签工业全球大奖'4个重量级奖项之一的'可持续发展大奖',该奖项表彰了ebeam在研发适用于窄幅轮转印刷机的紧凑型电子束固化系统方面的努力。
基金supported by Research Funds of Sichuan University of Arts and Science,China(Grant No.2012Z009Y)
文摘Using first-principles calculations based on density functional theory(DFT), the structural and electronic properties of hydrogenated antimonene have been systematically investigated. Phonon dispersion and molecular dynamics(MD)simulation reveal that fully hydrogenated(FH) antimonene has high dynamic stability and could be synthesized. A newσ-type Dirac cone related to Sb-px,y orbitals is found in FH antimonene, which is robust to tensile strain. Noticeably, the spin orbital coupling(SOC) opens a quantum spin Hall(QSH) gap of 425 meV at the Dirac cone, sufficiently large for practical applications at room temperature. Semi-hydrogenated antimonene is a non-magnetic metal. Our results show that FH antimonene may have great potential applications in next generation high-performance devices.
文摘Development of efficient heterostructured photocatalysts that respond to visible light remains a considerable challenge.We herein show the synthesis of ZnIn2S4/carbon quantum dot hybrid photocatalysts with flowerlike microspheres via a facile solvothermal method.The ZnIn2S4/carbon quantum dot flowerlike microspheres display enhanced photocatalytic and photoelectrochemical activity compared with that of pure ZnIn2S4.With a content of only 0.5 wt%carbon quantum dots,93%of Cr(VI)is reduced under visible‐light irradiation at 40 min.As a co‐catalyst,the carbon quantum dots improve the light absorption and lengthen the lifetime of charge carriers,consequently enhancing the photocatalytic and photoelectrochemical activity.
基金Financial support from the National Natural Science Foundation of China(No.21273191)is acknowledged.
文摘This article describes a theory unifying the unusual performance of the undercoordinated adatoms,point defects,terrace edges,surfaces,and nanostructures of various shapes.The ideas of bond order-length-strength correlation and the associated nonbonding electron polarization(BOLS-NEP)feature that bonds between undercoordinated atoms contract spontaneously.Bond contraction raises the local density of charge and energy.Bond strength gain deepens the interatomic potential well to trap the core and bonding electrons deeply.In turn,the locally and densely entrapped electrons polarize those partially occupying the valence band and above pertaining to the lower-coordinated atoms.The BOLS-NEP theory reconciles the unusual behaviors of undercoordinated systems and the size dependency of nanostructures in their lattice oscillating dynamics,mechanical strength,thermal stability,photon emissivity,chemical reactivity,dielectric permeability,associated with generation of polarized Dirac fermions,serving as carriers for extraordinary catalysis,hydrophobicity,fluidity,lubricity,as well as monolayer high-TC superconductivity and topological insulator conductivity.
基金the funding from the National Natural Science Foundation of China(52071225)the European Union’s Horizon Europe research and innovation programme under the grant agreement No.101087143(Electron Beam Emergent Additive Manufacturing(EBEAM))+2 种基金REFRESH-Research Excellence For Region Sustainability and High-tech Industries project No.CZ.10.03.01/00/22_003/0000048 via the Operational Programme Just TransitionNorway Grants project No.2019/34/H/ST8/00547 through the National Science Centrethe Jiangsu Funding Program for Excellent Postdoctoral Talent。
文摘Owing to their advantages such as high energy density and excellent cycle performance,lithium-ion batteries have occupied a dominant position for many years in the fields of consumer electronics,energy storage,and new energy vehicles.Graphite is the most widely commercialized anode material because of its stable layered structure,excellent electrical conductivity,and cost-effectiveness.However,its inherent limitations,notably its relatively low theoretical specific capacity(372 mAh/g)and sluggish intrinsic ion diffusion kinetics,pose significant challenges to the development of high-energy and power density battery systems.This article briefly introduces the intercalation and failure mechanisms of graphite anode materials,reviews the research progress in the bulk and surface regulation of these materials,and discusses their future development prospects.
