Heterostructure engineering by coupling different nanocrystals has received extensive attention because it can enhance the reaction kinetics of the anode of sodium-ion batteries(SIBs).However,constructing high-quality...Heterostructure engineering by coupling different nanocrystals has received extensive attention because it can enhance the reaction kinetics of the anode of sodium-ion batteries(SIBs).However,constructing high-quality heterostructure anode materials through green and environmentally friendly methods remains a challenge.Herein,we have proposed a simple one-step method by recycling the electronic waste metal materials to synthesize the Cu_(1.94)S/ZnS heterostructure materials.Combined with the experimental analysis and first principle calculations,we find that the synergistic effect of different components in heterostructure structures can significantly enhance the reversible capacity and rate performance of anode materials.Based on the constructed Cu_(1.94)S/ZnS anode,we obtain a superior reversible capacity of 440 mAh·g^(-1) at 100 mA·g^(-1) and 335 mAh·g^(-1) after 3000 cycles at 2000 mA·g^(-1).Our work sheds new light on designing high-rate and capacity anodes for SIBs through the greenness synthesis method.展开更多
Developing cost-effective electrocatalysts with high activity and stability especially at high current density is of great significance for the large-scale commercial application of electrochemical water splitting to ...Developing cost-effective electrocatalysts with high activity and stability especially at high current density is of great significance for the large-scale commercial application of electrochemical water splitting to hydrogen production but still remains challenging.Herein,we report an effective confinement pyrolysis strategy to fabricate embedded ruthenium-cobalt nanoclusters supported on N-doped porous two-dimensional carbon nanosheets(RuCo@CN).Markedly,the embedded structure can effectively prevent the migration,agglomeration,and leaching of nanoparticles,thus endowing the RuCo@CN catalyst with high stability.To be exact,high stability with up to 650 h can be achieved at high current density(-500 and-1000 mA·cm^(-2)).Besides,the RuCo@CN catalysts also exhibit highly reactive with low overpotentials of only 11mV at-10 mA·cm^(-2).Density functional theory calculations reveal that the introduction of cobalt reduces the decomposition barrier of H_(2)O for RuCo@CN alloy,thus promoting hydrogen evolution reaction.展开更多
Heterogeneous materials made of metal-organic frameworks(MOFs)and optically active nanomaterials have attracted intensive interests in recent years due to their distinct physicochemical properties,but controllable fab...Heterogeneous materials made of metal-organic frameworks(MOFs)and optically active nanomaterials have attracted intensive interests in recent years due to their distinct physicochemical properties,but controllable fabrication of these materials remains challenging yet.In this work,we report a new strategy to in situ fabricate heterogeneous nanomaterials based on UiO-66-NH2 and upconversion nanorods(UCNRs)via a hierarchical and dynamic assembly process.Core–satellite structured UiO-66-NH2@UCNRs have been successfully fabricated,and the formation mechanism was thoroughly investigated by the combined use of scanning electron microscopy(SEM)and Fourier transform infrared(FTIR)spectroscopy.Our results revealed the involvement of three main stages:supramolecular assembly of UiO-66-NH2 precursors with UCNRs,nucleation and growth of UiO-66-NH2 crystal,and dynamic assembly with UCNRs accompanied by Ostwald ripening.Furthermore,based on the hereditary optical and porous features of the heterogeneous nanomaterials,an enhanced multimodal synergistic anticancer platform has been established by integrating near-infrared(NIR)-triggered photodynamic therapy(PDT)and pH-triggered anticancer drug delivery,as confirmed by cellular experiments.The present study provides a new avenue for developing advanced functional heterogeneous nanomaterials via the hierarchical and dynamic assembly strategy.展开更多
TiNi-based shape memory alloys(SMAs)have been used as damping materials to eliminate noise and mechanical vibration.However,their application is limited by low working temperatures and damping capacity.In this work,tw...TiNi-based shape memory alloys(SMAs)have been used as damping materials to eliminate noise and mechanical vibration.However,their application is limited by low working temperatures and damping capacity.In this work,two novel Ti-Zr-Hf-Ni-Co-Cu high entropy shape memory alloys(HESMAs)with different transformation temperatures and damping properties were investigated.The results show that Ti_(25)Zr_(8)Hf_(17)Ni_(30)Co_(5)Cu_(15) has superior damping performance arising from martensitic transformation,shape memory effect(thermal cycle at constant load)as well as superelasticity.Compared to traditional TiNi-based SMAs,the as-cast HESMAs exhibit a much higher ultrahigh yield strength(∼2 GPa)and storage modulus(∼50 GPa).The high configuration entropy of the HESMAs with high uneven internal stress and severe lattice distortion is revealed as the underlying mechanisms governing distinctive damping performance.The effects of high configuration entropy and microheterogeneity on the martensitic transforma-tion behavior and damping performance of HESMAs are clarified in this work,which provides a basis for designing alloys with superior damping properties.展开更多
Gold nanoclusters(AuNCs)are an emerging type of ultrasmall nanomaterials possessing unique physicochemical characteristics.Metal–organic frameworks(MOFs),a singular kind of porous solid and crystalline material,have ...Gold nanoclusters(AuNCs)are an emerging type of ultrasmall nanomaterials possessing unique physicochemical characteristics.Metal–organic frameworks(MOFs),a singular kind of porous solid and crystalline material,have attracted tremendous attention in recent years.The combination of AuNCs and MOFs can integrate and improve the prominent properties of both components,such as high catalytic activities,tunable optical properties,good biocompatibility,surface functionality and stability,which make the composites of MOFs and AuNCs promising for sensing applications.This review systematically summarizes the recent progress on the sensing of various analytes via MOFs-mediated AuNCs assemblies based on strategies of luminescence sensing,colorimetric sensing,electrochemiluminescence sensing,and electrochemical and photoelectrochemical sensing.A brief outlook regarding the future development of MOFs-mediated AuNCs assemblies for sensing application is presented as well.展开更多
基金the Youth Science Fund Project of the National Natural Science Foundation of China(Grant No.12102358)the China Postdoctoral Science Foundation(Grant No.2020M692617)+3 种基金the Fundamental Research Funds for the Central Universities(Grant No.3102021HHZY030008)Natural Science Foundation of Chongqing of China(Grant No.cstc2021jcyj-msxmX0393)the Young Talent Fund of Association for Science and Technology in Shaanxi,China(Grant No.20220512)Advanced Space Propulsion Laboratory of BICE and Beijing Engineering Research Center of Efficient and Green Aerospace Propulsion Technology(Grant No.LabASP-2022-05).
基金supported by the National Natural Science Foundation of China(No.22275148)the Fundamental Research Funds for the Central Universities(No.D5000220443)+1 种基金Natural Science Foundation of Chongqing(No.CSTB2023NSCQMSX0538)China and Young Talent Fund of Association for Science and Technology in Shaanxi,China.
文摘Heterostructure engineering by coupling different nanocrystals has received extensive attention because it can enhance the reaction kinetics of the anode of sodium-ion batteries(SIBs).However,constructing high-quality heterostructure anode materials through green and environmentally friendly methods remains a challenge.Herein,we have proposed a simple one-step method by recycling the electronic waste metal materials to synthesize the Cu_(1.94)S/ZnS heterostructure materials.Combined with the experimental analysis and first principle calculations,we find that the synergistic effect of different components in heterostructure structures can significantly enhance the reversible capacity and rate performance of anode materials.Based on the constructed Cu_(1.94)S/ZnS anode,we obtain a superior reversible capacity of 440 mAh·g^(-1) at 100 mA·g^(-1) and 335 mAh·g^(-1) after 3000 cycles at 2000 mA·g^(-1).Our work sheds new light on designing high-rate and capacity anodes for SIBs through the greenness synthesis method.
基金financially supported by the Fundamental Research Funds for the Central Universities (No.D5000220257,D5000220443)the National Natural Science Foundation of China (No.22002120)+2 种基金the Natural Science Foundation of Chongqing,China (No.cstc2020jcyj-msxm X0750)the Guangdong Basic and Applied Basic Research Foundation (No.2019A1515110507)the Key Research and Development Program of Shaanxi (No.2023-YBGY-322)。
文摘Developing cost-effective electrocatalysts with high activity and stability especially at high current density is of great significance for the large-scale commercial application of electrochemical water splitting to hydrogen production but still remains challenging.Herein,we report an effective confinement pyrolysis strategy to fabricate embedded ruthenium-cobalt nanoclusters supported on N-doped porous two-dimensional carbon nanosheets(RuCo@CN).Markedly,the embedded structure can effectively prevent the migration,agglomeration,and leaching of nanoparticles,thus endowing the RuCo@CN catalyst with high stability.To be exact,high stability with up to 650 h can be achieved at high current density(-500 and-1000 mA·cm^(-2)).Besides,the RuCo@CN catalysts also exhibit highly reactive with low overpotentials of only 11mV at-10 mA·cm^(-2).Density functional theory calculations reveal that the introduction of cobalt reduces the decomposition barrier of H_(2)O for RuCo@CN alloy,thus promoting hydrogen evolution reaction.
基金the National Natural Science Foundation of China(Nos.U213010103 and 51821091)the Natural Science Foundation of Chongqing(No.cstc2020jcyjmsxmX1053)the Fundamental Research Funds for the Central Universities(Nos.3102019JC and 31020180QD085)。
文摘Heterogeneous materials made of metal-organic frameworks(MOFs)and optically active nanomaterials have attracted intensive interests in recent years due to their distinct physicochemical properties,but controllable fabrication of these materials remains challenging yet.In this work,we report a new strategy to in situ fabricate heterogeneous nanomaterials based on UiO-66-NH2 and upconversion nanorods(UCNRs)via a hierarchical and dynamic assembly process.Core–satellite structured UiO-66-NH2@UCNRs have been successfully fabricated,and the formation mechanism was thoroughly investigated by the combined use of scanning electron microscopy(SEM)and Fourier transform infrared(FTIR)spectroscopy.Our results revealed the involvement of three main stages:supramolecular assembly of UiO-66-NH2 precursors with UCNRs,nucleation and growth of UiO-66-NH2 crystal,and dynamic assembly with UCNRs accompanied by Ostwald ripening.Furthermore,based on the hereditary optical and porous features of the heterogeneous nanomaterials,an enhanced multimodal synergistic anticancer platform has been established by integrating near-infrared(NIR)-triggered photodynamic therapy(PDT)and pH-triggered anticancer drug delivery,as confirmed by cellular experiments.The present study provides a new avenue for developing advanced functional heterogeneous nanomaterials via the hierarchical and dynamic assembly strategy.
基金supported by the National Natural Science Foundation of China (NSFC) (Grant Nos.51971178,52271153 and 51871132)the Natural Science Basic Research Plan for Distinguished Young Scholars in Shaanxi Province (Grant No.2021JC-12)+1 种基金the Natural Science Foundation of Chongqing (Grant No.cstc2020jcyj-jqX0001)the Youth Innovation Promotion Association CAS (2021188).
文摘TiNi-based shape memory alloys(SMAs)have been used as damping materials to eliminate noise and mechanical vibration.However,their application is limited by low working temperatures and damping capacity.In this work,two novel Ti-Zr-Hf-Ni-Co-Cu high entropy shape memory alloys(HESMAs)with different transformation temperatures and damping properties were investigated.The results show that Ti_(25)Zr_(8)Hf_(17)Ni_(30)Co_(5)Cu_(15) has superior damping performance arising from martensitic transformation,shape memory effect(thermal cycle at constant load)as well as superelasticity.Compared to traditional TiNi-based SMAs,the as-cast HESMAs exhibit a much higher ultrahigh yield strength(∼2 GPa)and storage modulus(∼50 GPa).The high configuration entropy of the HESMAs with high uneven internal stress and severe lattice distortion is revealed as the underlying mechanisms governing distinctive damping performance.The effects of high configuration entropy and microheterogeneity on the martensitic transforma-tion behavior and damping performance of HESMAs are clarified in this work,which provides a basis for designing alloys with superior damping properties.
基金supported by the Natural Science Foundation of Chongqing(cstc2020jcyj-msxmX1053)the Research Fund of the State Key Laboratory of Solidification Processing(NPU),China(2020-QZ-01)
文摘Gold nanoclusters(AuNCs)are an emerging type of ultrasmall nanomaterials possessing unique physicochemical characteristics.Metal–organic frameworks(MOFs),a singular kind of porous solid and crystalline material,have attracted tremendous attention in recent years.The combination of AuNCs and MOFs can integrate and improve the prominent properties of both components,such as high catalytic activities,tunable optical properties,good biocompatibility,surface functionality and stability,which make the composites of MOFs and AuNCs promising for sensing applications.This review systematically summarizes the recent progress on the sensing of various analytes via MOFs-mediated AuNCs assemblies based on strategies of luminescence sensing,colorimetric sensing,electrochemiluminescence sensing,and electrochemical and photoelectrochemical sensing.A brief outlook regarding the future development of MOFs-mediated AuNCs assemblies for sensing application is presented as well.