Fast-charging technology is indeed a critical technical problem for electric vehicles today.Improving the conductivity of electrode materials is one of the effective ways to solve this technical bottleneck.Here,we inc...Fast-charging technology is indeed a critical technical problem for electric vehicles today.Improving the conductivity of electrode materials is one of the effective ways to solve this technical bottleneck.Here,we incorporated highly conductive MXene and carbon nanotubes into the electrode materials of Li_(4)Ti_(5)O_(12)(LTO)and LiFePO_(4)(LFP)to construct the composite electrode material 3D-LTO-CNT-MXene and 3D-LFP-CNT-MXene(named 3D-LTO and 3D-LFP).The 3D-LTO we synthesized demonstrated an impressive capacity of 146.2 mAh g^(-1)at a 20C rate(where 1C=175 mA g^(-1)),the 3D-LFP material exhibited a capacity of 104.6 mAh g^(-1)at a 20C rate(where 1C=170 mA g^(-1)).This remarkable rate capability can be attributed to the constructed three-dimensional conductive network,which facilitates enhanced electrical conductivity and electron migration rates,thereby promoting rapid charging and discharging of the batteries.Furthermore,we assembled a 3D-LTO‖3D-LFP full cell,which demonstrated exceptional performance at a high rate of 10C(1C=170 mA g^(-1)),achieving an energy density of 68.34 Wh kg^(-1)and a power density of 1547.5 W kg^(-1).This work demonstrates the feasibility of constructing 3D highly conductive electrode materials for rapid charging and discharging at high rates.It paves the way for the commercial application of truly ultra-fast charging in electric vehicles.展开更多
Modifying the electronic density of states and the synergistic effect of the active centers by introducing a second metal present an efficient strategy to tune physi/chemi-sorption,probably lead to improving catalytic...Modifying the electronic density of states and the synergistic effect of the active centers by introducing a second metal present an efficient strategy to tune physi/chemi-sorption,probably lead to improving catalytic performances.Herein,bimetallic Ni_(3)Mo/Al_(2)O_(3)catalyst was demonstrated and exhibited over 5 times more active than Pt/Al_(2)O_(3)toward the ethane dehydrogenation(EDH)as well as 2-10 times activity enhancement compared with their monometallic Ni and Mo counterparts and other Ni-based bimetallic nanoparticles.Kinetic studies revealed that the activation energy over Ni_(3)Mo/Al_(2)O_(3)(111 kJ mol^(-1))was much lower than that of Ni(157 kJ mol^(-1))and Mo(171 kJ·mol^(-1)).DFT calculations showed ethane was adsorbed on the Ni or Mo surface in a more parallel configuration,whereas over Ni_(3)Mo it adopted an inclined configuration.This change promoted ethane adsorption and pre-activation of the C-H bond,thereby benefiting the ethane dehydrogenation process on the Ni_(3)Mo surface.展开更多
Developing high-efficiency catalyst is crucial for electrochemical conversion of carbon dioxide(CO_(2))to high-value products.In the present work,a three-chamber electrolysis cell has been developed for CO_(2)reductio...Developing high-efficiency catalyst is crucial for electrochemical conversion of carbon dioxide(CO_(2))to high-value products.In the present work,a three-chamber electrolysis cell has been developed for CO_(2)reduction to carbon monoxide(CO)in an organic electrolyte,with sodium hydroxide(NaOH)and chlorine(Cl_(2))produced as byproducts.In order to improve the performance of the three-chamber electrolyzer,a gallium-based(Ga-based)ternary-porous catalyst(Ga-In_(4)Ag_(9))has been fabricated.During the long-term electrolysis process,Ga-In_(4)Ag_(9)catalyst exhibits good performance toward CO_(2)reduction reaction(CO_(2)RR),the CO partial current density achieves to 139.21 mA·cm^(-2)at-2.4 V(vs.SHE),with the Faraday efficiency(FE)of CO formation stabled at 92.3%.Density functional theory(DFT)analysis reveals that the position of the d-band center of Ga-In_(4)Ag_(9)is regulated by silver(Ag)atoms,which is beneficial for enhancing the binding ability between the catalyst and the intermediate.Owing to the adsorption of Cl^(-)on the surface of Ga-In_(4)Ag_(9),the reconfiguration of electron density has been altered,which is beneficial for the stabilization of*CO_(2)-intermediate.This work provides valuable insights for designing Ga-based metal catalysts toward CO_(2)electrolysis to produce high-value chemicals.展开更多
The Sun is the primary energy source driving the Earth's climate system.A prevailing hypothesis suggests that even minor variations in solar activity,when amplified by climate system feedback mechanisms,can induce...The Sun is the primary energy source driving the Earth's climate system.A prevailing hypothesis suggests that even minor variations in solar activity,when amplified by climate system feedback mechanisms,can induce significant climatic changes on decadal to centennial timescales.However,the limited availability of historical winter climate proxies has impeded consensus on how solar variability influences the long-term winter climate in Northeast Asia,particularly during Grand Solar Minima(GMs).In this study,we analyzed daily-resolution snowfall records in Seoul from 1625 to 1907 CE,derived from the Korean official historical chronicle Seungjeongweon Ilgi.This period encompasses both the Maunder Minimum(1645–1715 CE)and the Dalton Minimum(1790–1830 CE)of solar activity.Our findings indicate that during the GMs,the first date of annual snowfall(FDS)was delayed by approximately 10 days,and the average annual snowfall frequency(ASF)was reduced by half compared to non-GM periods.Additionally,while an 11-year solar cycle was evident in the ASF during non-GM periods,this cycle was replaced by a shortened 8-to 9-year cycle during the GMs.These variations suggest a differential regional climatic response to prolonged changes in solar activity,and provide historical insights that enhance our understanding of the potential impact of low solar activity on the winter climate in Northeast Asia.展开更多
Although diverse signal-amplified methods have been committed to improve the sensitivity of surface plasmon resonance(SPR)biosensing,introducing convenient and robust signal amplification strategy into SPR biosensing ...Although diverse signal-amplified methods have been committed to improve the sensitivity of surface plasmon resonance(SPR)biosensing,introducing convenient and robust signal amplification strategy into SPR biosensing remains challenging.Here,a novel nanozyme-triggered polymerization amplification strategy was proposed for constructing highly sensitive surface plasmon resonance(SPR)immunosensor.In detail,Au@Pd core-shell nanooctahedra nanozyme with superior peroxidase(POD)-like activity was synthesized and utilized as a label probe.Simultaneously,Au@Pd core-shell nanooctahedra nanozyme can catalyze the decomposition of H_(2)O_(2)to form hydroxyl radicals(·OH)that triggers the polymerization of aniline to form polyaniline attaching on the surface of sensor chip,significantly amplifying SPR responses.The sensitivity of SPR immunosensor was enhanced by nanozyme-triggered polymerization amplification strategy.Using human immunoglobulin G(HIgG)as a model,the constructed SPR immunosensor obtains a wide linear range of 0.005–1.0μg/m L with low detection limit of 0.106 ng/m L.This research provides new sights on establishing sensitive SPR immunosensor and may evokes more inspiration for developing signal amplification methods based on nanozyme in biosensing.展开更多
基金supported by Xinjiang Uygur Autonomous Region Graduate Research Innovation Project (No.XJ2024G195)Xinjiang Key Research and Development Project (No.2021B01001-1)+2 种基金the National Natural Science Foundation of China (No.22169020)the Natural Science Foundation of University in Jiangsu province (No.22KJB150003)the National Natural Science Foundation of China (No.22309068)
文摘Fast-charging technology is indeed a critical technical problem for electric vehicles today.Improving the conductivity of electrode materials is one of the effective ways to solve this technical bottleneck.Here,we incorporated highly conductive MXene and carbon nanotubes into the electrode materials of Li_(4)Ti_(5)O_(12)(LTO)and LiFePO_(4)(LFP)to construct the composite electrode material 3D-LTO-CNT-MXene and 3D-LFP-CNT-MXene(named 3D-LTO and 3D-LFP).The 3D-LTO we synthesized demonstrated an impressive capacity of 146.2 mAh g^(-1)at a 20C rate(where 1C=175 mA g^(-1)),the 3D-LFP material exhibited a capacity of 104.6 mAh g^(-1)at a 20C rate(where 1C=170 mA g^(-1)).This remarkable rate capability can be attributed to the constructed three-dimensional conductive network,which facilitates enhanced electrical conductivity and electron migration rates,thereby promoting rapid charging and discharging of the batteries.Furthermore,we assembled a 3D-LTO‖3D-LFP full cell,which demonstrated exceptional performance at a high rate of 10C(1C=170 mA g^(-1)),achieving an energy density of 68.34 Wh kg^(-1)and a power density of 1547.5 W kg^(-1).This work demonstrates the feasibility of constructing 3D highly conductive electrode materials for rapid charging and discharging at high rates.It paves the way for the commercial application of truly ultra-fast charging in electric vehicles.
文摘Modifying the electronic density of states and the synergistic effect of the active centers by introducing a second metal present an efficient strategy to tune physi/chemi-sorption,probably lead to improving catalytic performances.Herein,bimetallic Ni_(3)Mo/Al_(2)O_(3)catalyst was demonstrated and exhibited over 5 times more active than Pt/Al_(2)O_(3)toward the ethane dehydrogenation(EDH)as well as 2-10 times activity enhancement compared with their monometallic Ni and Mo counterparts and other Ni-based bimetallic nanoparticles.Kinetic studies revealed that the activation energy over Ni_(3)Mo/Al_(2)O_(3)(111 kJ mol^(-1))was much lower than that of Ni(157 kJ mol^(-1))and Mo(171 kJ·mol^(-1)).DFT calculations showed ethane was adsorbed on the Ni or Mo surface in a more parallel configuration,whereas over Ni_(3)Mo it adopted an inclined configuration.This change promoted ethane adsorption and pre-activation of the C-H bond,thereby benefiting the ethane dehydrogenation process on the Ni_(3)Mo surface.
基金supported by the National Natural Science Foundation of China(Nos.52164048 and 52067012)the Natural Science Foundation of Kunming University of Science and Technology(No.KKZ3202437105)the Analysis and Testing Foundation of Kunming University of Science and Technology(No.2023P20221102026).
文摘Developing high-efficiency catalyst is crucial for electrochemical conversion of carbon dioxide(CO_(2))to high-value products.In the present work,a three-chamber electrolysis cell has been developed for CO_(2)reduction to carbon monoxide(CO)in an organic electrolyte,with sodium hydroxide(NaOH)and chlorine(Cl_(2))produced as byproducts.In order to improve the performance of the three-chamber electrolyzer,a gallium-based(Ga-based)ternary-porous catalyst(Ga-In_(4)Ag_(9))has been fabricated.During the long-term electrolysis process,Ga-In_(4)Ag_(9)catalyst exhibits good performance toward CO_(2)reduction reaction(CO_(2)RR),the CO partial current density achieves to 139.21 mA·cm^(-2)at-2.4 V(vs.SHE),with the Faraday efficiency(FE)of CO formation stabled at 92.3%.Density functional theory(DFT)analysis reveals that the position of the d-band center of Ga-In_(4)Ag_(9)is regulated by silver(Ag)atoms,which is beneficial for enhancing the binding ability between the catalyst and the intermediate.Owing to the adsorption of Cl^(-)on the surface of Ga-In_(4)Ag_(9),the reconfiguration of electron density has been altered,which is beneficial for the stabilization of*CO_(2)-intermediate.This work provides valuable insights for designing Ga-based metal catalysts toward CO_(2)electrolysis to produce high-value chemicals.
基金supported by the National Natural Science Foundation of China(Grant No.42388101)the National Natural Science Foundation of China(42241106)CAS Youth Interdisciplinary Team(JCTD-2021-05).
文摘The Sun is the primary energy source driving the Earth's climate system.A prevailing hypothesis suggests that even minor variations in solar activity,when amplified by climate system feedback mechanisms,can induce significant climatic changes on decadal to centennial timescales.However,the limited availability of historical winter climate proxies has impeded consensus on how solar variability influences the long-term winter climate in Northeast Asia,particularly during Grand Solar Minima(GMs).In this study,we analyzed daily-resolution snowfall records in Seoul from 1625 to 1907 CE,derived from the Korean official historical chronicle Seungjeongweon Ilgi.This period encompasses both the Maunder Minimum(1645–1715 CE)and the Dalton Minimum(1790–1830 CE)of solar activity.Our findings indicate that during the GMs,the first date of annual snowfall(FDS)was delayed by approximately 10 days,and the average annual snowfall frequency(ASF)was reduced by half compared to non-GM periods.Additionally,while an 11-year solar cycle was evident in the ASF during non-GM periods,this cycle was replaced by a shortened 8-to 9-year cycle during the GMs.These variations suggest a differential regional climatic response to prolonged changes in solar activity,and provide historical insights that enhance our understanding of the potential impact of low solar activity on the winter climate in Northeast Asia.
基金supported by National Natural Science Foundation of China(Nos.22474124,21575125)the National Natural Science Foundation of Jiangsu Province(No.BK20221370)+4 种基金Key University Natural Science Foundation of Jiangsu-Province(No.20KJA150004)the Project for Science and Technology of Yangzhou(No.YZ2022074)Project for Yangzhou City and Yangzhou University corporation(No.YZ2023204)the Open Research Fund of State Key Laboratory of Analytical Chemistry for Life Science(No.SKLACLS2405)Postgraduate Research&Practice Innovation Program of Jiangsu Province(No.KYCX22_3462)。
文摘Although diverse signal-amplified methods have been committed to improve the sensitivity of surface plasmon resonance(SPR)biosensing,introducing convenient and robust signal amplification strategy into SPR biosensing remains challenging.Here,a novel nanozyme-triggered polymerization amplification strategy was proposed for constructing highly sensitive surface plasmon resonance(SPR)immunosensor.In detail,Au@Pd core-shell nanooctahedra nanozyme with superior peroxidase(POD)-like activity was synthesized and utilized as a label probe.Simultaneously,Au@Pd core-shell nanooctahedra nanozyme can catalyze the decomposition of H_(2)O_(2)to form hydroxyl radicals(·OH)that triggers the polymerization of aniline to form polyaniline attaching on the surface of sensor chip,significantly amplifying SPR responses.The sensitivity of SPR immunosensor was enhanced by nanozyme-triggered polymerization amplification strategy.Using human immunoglobulin G(HIgG)as a model,the constructed SPR immunosensor obtains a wide linear range of 0.005–1.0μg/m L with low detection limit of 0.106 ng/m L.This research provides new sights on establishing sensitive SPR immunosensor and may evokes more inspiration for developing signal amplification methods based on nanozyme in biosensing.
