The kagome lattice has garnered significant attention due to its ability to host quantum spin Fermi liquid states.Recently,the combination of unique lattice geometry,electron–electron correlations,and adjustable magn...The kagome lattice has garnered significant attention due to its ability to host quantum spin Fermi liquid states.Recently,the combination of unique lattice geometry,electron–electron correlations,and adjustable magnetism in solid kagome materials has led to the discovery of numerous fascinating quantum properties.These include unconventional superconductivity,charge and spin density waves(CDW/SDW),pair density waves(PDW),and Chern insulator phases.These emergent states are closely associated with the distinctive characteristics of the kagome lattice's electronic structure,such as van Hove singularities,Dirac fermions,and flat bands,which can exhibit exotic quasi-particle excitations under different symmetries and magnetic conditions.Recently,various quantum kagome materials have been developed,typically consisting of kagome layers stacked along the z-axis with atoms either filling the geometric centers of the kagome lattice or embedded between the layers.In this topical review,we begin by introducing the fundamental properties of several kagome materials.To gain an in-depth understanding of the relationship between topology and correlation,we then discuss the complex phenomena observed in these systems.These include the simplest kagome metal T_(3)X,kagome intercalation metal T X,and the ternary compounds AT_(6)X_(6)and RT_(3)X_(5)(A=Li,Mg,Ca,or rare earth;T=V,Cr,Mn,Fe,Co,Ni;X=Sn,Ge;R=K,Rb,Cs).Finally,we provide a perspective on future experimental work in this field.展开更多
Supercapacitors(SCs)have been considered as the most promising energy storage device due to high power density,long cycle life,and fast energy storage and efficient delivery.The excellent electrode materials of SCs ge...Supercapacitors(SCs)have been considered as the most promising energy storage device due to high power density,long cycle life,and fast energy storage and efficient delivery.The excellent electrode materials of SCs generally have based on large porous structure,excellent conductivity,and heteroatom doping for charge transfer.Among various electrode materials,biomass-derived carbon materials have received widespread attention owing to excellent performances,environmental friendliness,lowcost and renewability.Additionally,composites materials based on biomass-derived carbon and transition metalbased material can obtain more advantages of structural and performance than single component,which opens up a new way for the fabrication of high-performance SC electrode materials.Therefore,this review aims to the recent progress on the design and fabrication of biomassderived carbons/transition metal-based composites in supercapacitor application.Finally,the development trends and challenges of biomass-derived electrode materials have been discussed and prospected.展开更多
Searching for the dispersionless flat band(FB)in quantum materials,especially in topological systems,becomes an interesting topic.The kagome lattice is an ideal platform for such exploration because the FB can be natu...Searching for the dispersionless flat band(FB)in quantum materials,especially in topological systems,becomes an interesting topic.The kagome lattice is an ideal platform for such exploration because the FB can be naturally induced by the underlying destructive interference.Nevertheless,the magnetic kagome system that hosts the FB close to the Fermi level(EF)is exceptionally rare.Here,we study the electronic structure of a kagome magnet LuMn_(6)Sn_(6) by combining angleresolved photoemission spectroscopy and density functional theory calculations.The observed Fermi-surface topology and overall band dispersions are similar to previous studies of the XMn_(6)Sn_(6)(X=Dy,Tb,Gd,Y)family of compounds.We clearly observe two kagome-derived FBs extending through the entire Brillouin zone,and one of them is located just below EF.The photon-energy-dependent measurements reveal that these FBs are nearly dispersionless along the kz direction as well,supporting the quasi-two-dimensional character of such FBs.Our results complement the XMn_(6)Sn_(6) family and demonstrate the robustness of the FB features across this family.展开更多
By using angle-resolvea photoemission spectroscopy(ARPES) combined with the first-principies electronic structure calculations,we report the quantized states at the surface of a single crystal 2 H-TaSe_(2).We have obs...By using angle-resolvea photoemission spectroscopy(ARPES) combined with the first-principies electronic structure calculations,we report the quantized states at the surface of a single crystal 2 H-TaSe_(2).We have observed sub-bands of quantized states at the three-dimensional Brillouin zone center due to a highly dispersive band with light effective mass along k_(z) direction.The quantized sub-bands shift upward towards E_(F) while the bulk band at Γ shifts downward with the decrease of temperature across charge density wave(CDW) formation.The band shifts could be intimately related to the CDW.While neither the two-dimensional Fermi-surface nesting nor purely strong electron-phonon coupling can explain the mechanism of CDW in 2 H-TaSe_(2),our experiment may ignite the interest in understanding the CDW mechanism in this family.展开更多
Amidst escalating global energy demands and the depletion of fossil fuel reserves,there is an urgent need to develop energy storage materials derived fromlow-cost and sustainable biomass.Lignin,an abundant aromatic po...Amidst escalating global energy demands and the depletion of fossil fuel reserves,there is an urgent need to develop energy storage materials derived fromlow-cost and sustainable biomass.Lignin,an abundant aromatic polymer,has gained increasing recognition as a highly promising precursor for electrode materials due to its low cost,high carbon content,and rich functional groups.For electrochemical energy storage applications,lignin-derived carbon materials,including porous carbon,carbon fibers,and carbon aerogels,demonstrate considerable potential as effective electrodes.This review provides a comprehensive summary and analysis of recent advances in the field.It systematically elaborates on the types of lignin-based carbon materials,their preparation methods,as well as their microstructures and porosity.The application performance of these materials as carbon electrodes in batteries and supercapacitors is thoroughly examined.Furthermore,the review analyzes and summarizes the relationships between structure-performance,and highlights the current research progress and challenges associated with their preparation.Finally,it discusses the existing challenges in utilizing lignin-based carbon electrodes for electrochemical energy storage and explores their potential integration with emerging green technologies and novel theoretical approaches.By offering a critical perspective on these aspects,this review aims to provide valuable insights and strategic directions for future breakthroughs in the development of lignin-based energy storage materials.展开更多
There is an urgent need to develop innovative therapeutic strategies for hepatocellular carcinoma(HCC)treatment with severe hypoxia.Covalent organic frameworks(COFs)hold promise for photodynamic therapy(PDT),yet their...There is an urgent need to develop innovative therapeutic strategies for hepatocellular carcinoma(HCC)treatment with severe hypoxia.Covalent organic frameworks(COFs)hold promise for photodynamic therapy(PDT),yet their antitumor efficacy is limited by the hypoxia intolerance of type II PDT.Herein,we report a COF-based nanoplatform grafted with type I photosensitizer(Enbs-Ar-NH_(2))and co-loaded with lenvatinib(Len)and curcumin(Cur),enabling concurrent type I PDT and chemotherapy(CT).The platform is conjugated with galactose(GalNAc)and RGD peptides,denoted as LC@GR-COF-E,which achieves dual-targeting toward hepatocytes via ASGPR recognition and tumor-associated endothelia binding.In vitro results demonstrate that the combination of Len and Cur effectively suppresses tumor cell proliferation.Importantly,LC@GR-COF-E can be activated to eradicate hypoxic tumor cells via oxygen-independent type I PDT under NIR irradiation.LC@GR-COF-E/NIR exhibits potent anti-metastatic effects,particularly against HCC cancer stem cell-like cells(C5WN1),by downregulating MMP-2 and MMP-9 and modulating epithelial-mesenchymal transition(EMT)-related protein expression(N-cadherin).In a subcutaneous C5WN1 hypoxic tumor-bearing mouse model,the platform achieves a tumor inhibition rate of 95.5%±1.7%,offering a powerful strategy to overcome HCC hypoxia barriers.Our work pioneers a COF-based type I PDT platform for precise therapy against hypoxic HCC.展开更多
基金Project supported by the National Natural Science Foundation of China(Grant No.12204536)the Fundamental Research Funds for the Central Universitiesthe Research Funds of People’s Public Security University of China(PPSUC)(Grant No.2023JKF02ZK09)。
文摘The kagome lattice has garnered significant attention due to its ability to host quantum spin Fermi liquid states.Recently,the combination of unique lattice geometry,electron–electron correlations,and adjustable magnetism in solid kagome materials has led to the discovery of numerous fascinating quantum properties.These include unconventional superconductivity,charge and spin density waves(CDW/SDW),pair density waves(PDW),and Chern insulator phases.These emergent states are closely associated with the distinctive characteristics of the kagome lattice's electronic structure,such as van Hove singularities,Dirac fermions,and flat bands,which can exhibit exotic quasi-particle excitations under different symmetries and magnetic conditions.Recently,various quantum kagome materials have been developed,typically consisting of kagome layers stacked along the z-axis with atoms either filling the geometric centers of the kagome lattice or embedded between the layers.In this topical review,we begin by introducing the fundamental properties of several kagome materials.To gain an in-depth understanding of the relationship between topology and correlation,we then discuss the complex phenomena observed in these systems.These include the simplest kagome metal T_(3)X,kagome intercalation metal T X,and the ternary compounds AT_(6)X_(6)and RT_(3)X_(5)(A=Li,Mg,Ca,or rare earth;T=V,Cr,Mn,Fe,Co,Ni;X=Sn,Ge;R=K,Rb,Cs).Finally,we provide a perspective on future experimental work in this field.
基金financially supported by the National Natural Science of China(Nos.22001156 and 21401121)General Financial Grant from the China Postdoctoral Science Foundation(No.2017M623095)Returned Personnel Science Foundation of Shaanxi Province,China(No.2018044)。
文摘Supercapacitors(SCs)have been considered as the most promising energy storage device due to high power density,long cycle life,and fast energy storage and efficient delivery.The excellent electrode materials of SCs generally have based on large porous structure,excellent conductivity,and heteroatom doping for charge transfer.Among various electrode materials,biomass-derived carbon materials have received widespread attention owing to excellent performances,environmental friendliness,lowcost and renewability.Additionally,composites materials based on biomass-derived carbon and transition metalbased material can obtain more advantages of structural and performance than single component,which opens up a new way for the fabrication of high-performance SC electrode materials.Therefore,this review aims to the recent progress on the design and fabrication of biomassderived carbons/transition metal-based composites in supercapacitor application.Finally,the development trends and challenges of biomass-derived electrode materials have been discussed and prospected.
基金Project supported by the National Natural Science Foundation of China(Grant No.12204536)the Fundamental Research Funds for the Central Universities,and the Research Funds of People’s Public Security University of China(PPSUC)(Grant No.2023JKF02ZK09).
文摘Searching for the dispersionless flat band(FB)in quantum materials,especially in topological systems,becomes an interesting topic.The kagome lattice is an ideal platform for such exploration because the FB can be naturally induced by the underlying destructive interference.Nevertheless,the magnetic kagome system that hosts the FB close to the Fermi level(EF)is exceptionally rare.Here,we study the electronic structure of a kagome magnet LuMn_(6)Sn_(6) by combining angleresolved photoemission spectroscopy and density functional theory calculations.The observed Fermi-surface topology and overall band dispersions are similar to previous studies of the XMn_(6)Sn_(6)(X=Dy,Tb,Gd,Y)family of compounds.We clearly observe two kagome-derived FBs extending through the entire Brillouin zone,and one of them is located just below EF.The photon-energy-dependent measurements reveal that these FBs are nearly dispersionless along the kz direction as well,supporting the quasi-two-dimensional character of such FBs.Our results complement the XMn_(6)Sn_(6) family and demonstrate the robustness of the FB features across this family.
基金Project supported by the National Natural Science Foundation of China(Grant Nos.11774421,11774424,11574394,11774423,11822412,and 11874047)the National Key R&D Program of China(Grant Nos.2016YFA0401002,2018YFA0307000,2016YFA0300504,and 2018FYA0305800)the Fundamental Research Funds for the Central Universities,China(Grant No.2042018kf-0030)。
文摘By using angle-resolvea photoemission spectroscopy(ARPES) combined with the first-principies electronic structure calculations,we report the quantized states at the surface of a single crystal 2 H-TaSe_(2).We have observed sub-bands of quantized states at the three-dimensional Brillouin zone center due to a highly dispersive band with light effective mass along k_(z) direction.The quantized sub-bands shift upward towards E_(F) while the bulk band at Γ shifts downward with the decrease of temperature across charge density wave(CDW) formation.The band shifts could be intimately related to the CDW.While neither the two-dimensional Fermi-surface nesting nor purely strong electron-phonon coupling can explain the mechanism of CDW in 2 H-TaSe_(2),our experiment may ignite the interest in understanding the CDW mechanism in this family.
基金supported by the National Natural Science Foundation of China(No.22378252)the Key Research and Development Project of Shaanxi Province ofChina(No.2024GX-YBXM-472)Shaanxi Provincial Education Department Youth Innovation Team Research Project(No.23JP016).
文摘Amidst escalating global energy demands and the depletion of fossil fuel reserves,there is an urgent need to develop energy storage materials derived fromlow-cost and sustainable biomass.Lignin,an abundant aromatic polymer,has gained increasing recognition as a highly promising precursor for electrode materials due to its low cost,high carbon content,and rich functional groups.For electrochemical energy storage applications,lignin-derived carbon materials,including porous carbon,carbon fibers,and carbon aerogels,demonstrate considerable potential as effective electrodes.This review provides a comprehensive summary and analysis of recent advances in the field.It systematically elaborates on the types of lignin-based carbon materials,their preparation methods,as well as their microstructures and porosity.The application performance of these materials as carbon electrodes in batteries and supercapacitors is thoroughly examined.Furthermore,the review analyzes and summarizes the relationships between structure-performance,and highlights the current research progress and challenges associated with their preparation.Finally,it discusses the existing challenges in utilizing lignin-based carbon electrodes for electrochemical energy storage and explores their potential integration with emerging green technologies and novel theoretical approaches.By offering a critical perspective on these aspects,this review aims to provide valuable insights and strategic directions for future breakthroughs in the development of lignin-based energy storage materials.
基金supported by the National Key R&D Program of China(2024YFA0918300,China)the National Natural Science Foundation of China(22478153,22177041,22408066,China)the Natural Science Foundation of Jiangsu Province(BK20202002,China).
文摘There is an urgent need to develop innovative therapeutic strategies for hepatocellular carcinoma(HCC)treatment with severe hypoxia.Covalent organic frameworks(COFs)hold promise for photodynamic therapy(PDT),yet their antitumor efficacy is limited by the hypoxia intolerance of type II PDT.Herein,we report a COF-based nanoplatform grafted with type I photosensitizer(Enbs-Ar-NH_(2))and co-loaded with lenvatinib(Len)and curcumin(Cur),enabling concurrent type I PDT and chemotherapy(CT).The platform is conjugated with galactose(GalNAc)and RGD peptides,denoted as LC@GR-COF-E,which achieves dual-targeting toward hepatocytes via ASGPR recognition and tumor-associated endothelia binding.In vitro results demonstrate that the combination of Len and Cur effectively suppresses tumor cell proliferation.Importantly,LC@GR-COF-E can be activated to eradicate hypoxic tumor cells via oxygen-independent type I PDT under NIR irradiation.LC@GR-COF-E/NIR exhibits potent anti-metastatic effects,particularly against HCC cancer stem cell-like cells(C5WN1),by downregulating MMP-2 and MMP-9 and modulating epithelial-mesenchymal transition(EMT)-related protein expression(N-cadherin).In a subcutaneous C5WN1 hypoxic tumor-bearing mouse model,the platform achieves a tumor inhibition rate of 95.5%±1.7%,offering a powerful strategy to overcome HCC hypoxia barriers.Our work pioneers a COF-based type I PDT platform for precise therapy against hypoxic HCC.
