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Effects of compressing and remelting in SIMA processing on semi-solid structure evolution of an Al-Zn wrought alloy 认领 引用 被引量：6
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作者 LIUChangming ZOUMaohua 《Rare Metals》 SCIE EI CAS 2003年第3期185-191,共7页
Structure evolution of an Al-Zn wrought alloy in remelting processing in thestrain induced melt activated (SIMA) serai-solid procedure was observed, and effects of factors, theremelting temperature, the holding time, ... Structure evolution of an Al-Zn wrought alloy in remelting processing in thestrain induced melt activated (SIMA) serai-solid procedure was observed, and effects of factors, theremelting temperature, the holding time, and the compression strain, on structures and grain sizesof the alloy were investigated. The results show that (1) the proper temperature of remelting is inthe range of 610 to 615℃; (2) the grain size in specimen with greater compression strain is smallerthan that with smaller compression strain in condition of the same remelting temperature andholding time, and the grain size in local area with great local equivalent strain is smaller thanthat with small one; (3) liquid occurs in form of cluster in matrix during remelting and itsquantity increases with remelting time increasing; liquid in specimen with great compression strainoccurs earlier than that with small one, and quantity of liquid in the center of specimen withgreater local equivalent strain is greater than that in the two ends of it; (4) distortion energyafter deforming in matrix of the alloy is the significant factor to activate melting of matrix atlocal area with great local equivalent strain. 展开更多
关键词 semi-solid structure evolution strain induced melt activated processing semi-solid remelting Al-Zn alloy
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Evolution and Causes of the Convective Structure and Microphysical Characteristics of Super Typhoon Saola 认领 引用
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作者 XIAO Liu-si ZHANG Hua-long +3 位作者 WU Nai-geng FENG Lu ZHANG A-si CHEN Sheng 《Journal of Tropical Meteorology》 SCIE CAS CSCD 2026年第2期158-175,共18页
Guangdong Province experienced heavy to extremely heavy rainstorms during Super Typhoon Saola(2023).Areas such as Yunfu,which are typically drier,experienced anomalously extreme rainfall during this event.We analyzed ... Guangdong Province experienced heavy to extremely heavy rainstorms during Super Typhoon Saola(2023).Areas such as Yunfu,which are typically drier,experienced anomalously extreme rainfall during this event.We analyzed the convective structure and microphysical characteristics of the typhoon using dual-polarization radar,disdrometer,and ERA5 reanalysis data.The results show that following Saola’s second landfall,convection redeveloped on the northern side,which was characterized by rich mid-level ice particles and low rain mixing ratios.This resulted in a phase difference in the precipitation particles along Saola’s path.Stations that recorded heavy rain were categorized into four types based on raindrop spectral,spatial,and temporal variables by employing the K-means clustering algorithm.Specifically,the particles observed at Doumen(DM)were classified into a different category from those observed at Yangchun(YC)and Luoding(LD).The microphysical characteristics of raindrop particles evolve under the influence of vertical motion.At DM,the convective structure exhibited a single center of vertical motion with fewer high-altitude ice particles,resulting in a uniform oceanic raindrop type.By contrast,YC was sequentially influenced by two vertically separated centers of vertical motion in the upper and lower atmospheres.These centers alternately dominated the ice-phase and warm-rain processes,resulting in a complex raindrop evolution that transitioned from an intermediate state to a continental type before rapidly reverting to an oceanic type.At LD,the structure showed more pronounced baroclinicity with a higher concentration of water vapor in lower levels,with raindrops tending towards an intermediate continental type.The evolution of vertical motion was driven by changes in environmental conditions.The addition of cold air complicated raindrop evolution in western Guangdong Province compared with that in the Pearl River Estuary.The upper-level vertical-motion center,induced by the uplifting effect of the frontal zone associated with cold air,promoted the development of ice-phase processes and an increase in raindrop size.Subsequently,the lower-level upward-motion center became dominant,which enhanced precipitation concentration.A unique circulation pattern created by the interaction of twin typhoons with each other and with cold air intensified the low-level easterly winds and moisture influx,contributing to extreme rainfall in a typically drier region.Orographic convergence and uplift also played a role in the microphysical evolution of raindrops. 展开更多
关键词 typhoon convective structure microphysical characteristics evolution and causes
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Core-shell structured CoFe-PBA@NiFe-LDH as efficient electrocatalysts for oxygen evolution reaction 认领 引用
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作者 Guang-Long Wang Jun-Hui Cao +7 位作者 Shu-Sen Hou Yu Zhang Hu Zhou Chun Ouyang Long-Feng Lin Yan-Xin Qiao Yi-Shan Jiang Qi-Chao Zhang 《Journal of Iron and Steel Research International》 SCIE EI CSCD 2026年第7期158-167,共10页
NiFe-based layered double hydroxide(NiFe-LDH)nanosheets were hydrothermally anchored onto the surface of CoFe-based Prussian blue analogue(CoFe-PBA)nanocubes,resulting in the formation of core-shell-structured CoFe-PB... NiFe-based layered double hydroxide(NiFe-LDH)nanosheets were hydrothermally anchored onto the surface of CoFe-based Prussian blue analogue(CoFe-PBA)nanocubes,resulting in the formation of core-shell-structured CoFe-PBA@NiFe-LDH.Electrochemical characterizations revealed that this material exhibits exceptional oxygen evolution reaction(OER)activity coupled with remarkable long-term stability in alkaline media.The optimized CoFe-PBA@NiFe-LDH catalyst achieves a low OER overpotential of 287 mV to reach a current density of 10 mA cm−2,accompanied by a favorable Tafel slope of 77 mV dec−1.Notably,the catalyst can maintain the initial catalytic activity even after 18 h of continuous operation,with its morphology and crystalline structure remaining well-preserved.The superb electrocatalytic performance is fundamentally attributed to the synergistic core-shell architecture,where the uniform decoration of NiFe-LDH nanosheets on CoFe-PBA nanocubes maximizes the exposure of abundant and highly accessible active sites while facilitating the mass transport of reactive intermediates. 展开更多
关键词 Oxygen evolution reaction Electrocatalyst Core–shell structure Prussian blue analogue Layered double hydroxide
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Crystal structure evolution and thermal stability of high explosive RDX characterized by in situ single crystal X-ray diffraction 认领 引用
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作者 Peilin Yang Liyuan Wei +5 位作者 Jinkun Guo Chunbo Shi Yiru Chen Yu Liu Xiaoan Wei Shiliang Huang 《Defence Technology（防务技术）》 SCIE EI CAS CSCD 2026年第5期280-287,共8页
Crystal structure evolution of energetic crystals under external stimuli can significantly change their chemical/physical properties and profoundly impact the effectiveness and safety of weapon systems.In this study,t... Crystal structure evolution of energetic crystals under external stimuli can significantly change their chemical/physical properties and profoundly impact the effectiveness and safety of weapon systems.In this study,the evolution of the crystal structure of the high explosive 1,3,5-trinitro-1,3,5-triazine(Cyclotrimethylenetrinitramine,RDX)is investigated within the temperature range of−100℃–100℃ using in situ single-crystal X-ray diffraction technology.The thermal expansion rates of unit cell along the crystal axes and the inter-layer spacings of the mainly exposed crystal planes(111),(210)and(021)are calculated.Compared to the linear expansion of the unit cell,the increase of the atomic thermal vibrations,described by atomic displacement parameter(ADP),of RDX follows an exponential function.The ADP of the nitro group increases much faster than those of the central ring,especially at high temperatures,which is considered to be the cause of the molecular decomposition of RDX,and is consistent with calculation results identifying the−NO₂bond as the trigger of explosive decomposition.A tendency from AAE to AAA conformation is found for the RDX molecule,according to the orientation angle change of the nitro groups relative to the central ring,which causes the compression of the central ring.By comparing the crystal structure evolution behavior of RDX with HMX,it is concluded that the smaller unit cell expansion,the stronger atomic vibration and the lower molecular deformation ability of RDX are not conducive to buffering external energy,which are the main reason for the lower thermal stability,higher mechanical sensitivity and absence of phase transition before thermal decomposition of RDX,compared to HMX.These results will provide a promising way to characterize the crystal structure evolution of energetic materials for the comprehensive understanding of their properties and performance at the atomic and molecular levels. 展开更多
关键词 Energetic material Crystal structure evolution 1,3,5-Trinitro-1,3,5-triazine(RDX) Molecular conformation Thermal stability
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Mo,B-induced local structure and electron redistribution of RuO2for efficient acidic oxygen evolution 认领 引用
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作者 Ziang Shang Heyu Sui +6 位作者 Zeyi Huang Xueting Feng Guanzhen Chen Jiena Weng Yu Xiong Yaqiong Su Yunhu Han 《Chinese Chemical Letters》 SCIE CAS CSCD 2026年第6期678-683,共6页
Oxygen evolution reaction(OER)is a key reaction in proton exchange membrane water electrolyzers(PEMWEs).Therefore,developing cost-effective acid-stable electrocatalysts to drive efficient OER is crucial.Here,we constr... Oxygen evolution reaction(OER)is a key reaction in proton exchange membrane water electrolyzers(PEMWEs).Therefore,developing cost-effective acid-stable electrocatalysts to drive efficient OER is crucial.Here,we constructed a RuO2electrocatalyst(MoB-RuO2)co-doped Mo and B atoms,which exhibits excellent OER performance in acidic media.In 0.5 mol/L H2SO4,MoB-RuO2exhibited a very low overpotential(166 mV)and could be operated stably for more than 550 h at 10 mA/cm2current density without significant loss of activity.More than 240 h of stable operation at 200 mA/cm2current density was achieved when using MoB-RuO2as a PEMWE anode.Experimental and theoretical results demonstrated that the excellent OER activity and stability of MoB-RuO2mainly originated from the incorporation of B atoms leading to the coordination unsaturation of the active centre Ru,and the simultaneous doping of Mo and B atoms modulated the electronic structure of Ru,which lowered the covalency of the Ru-O bond,thus making the catalyst exhibit excellent stability. 展开更多
关键词 RuO2 Electrocatalysis Oxygen evolution reaction Electronic structure Proton exchange membrane water electrolyzers
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Rationally designed nickel-cobalt oxide/sulfide heterostructure for high-performance oxygen evolution reaction and anion exchange membrane water electrolysis 认领 引用 被引量：1
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作者 Hyeonji Kwon Hyeongseok Seo +3 位作者 Siyeon Kang Sang Eun Shim Kyeongseok Min Sung-Hyeon Baeck 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2026年第1期955-966,I0021,共12页
To realize the practical application of anion exchange membrane water electrolysis(AEMWE),it is essential to develop highly active,durable,and cost-effective electrocatalyst for oxygen evolution reaction(OER).Herein,w... To realize the practical application of anion exchange membrane water electrolysis(AEMWE),it is essential to develop highly active,durable,and cost-effective electrocatalyst for oxygen evolution reaction(OER).Herein,we report a hollow-structured NixCo1−xO/Ni3S2/Co9S8heterostructure synthesized via sequential template-assisted growth,thermal oxidation,and controlled sulfidation process.The abundant bimetallic heterointerfaces not only provide additional active sites but also promote electronic modulation via charge redistribution.Additionally,the porous and hollow architecture enhances active surface area and mass transfer ability,thereby increasing the number of accessible active sites for alkaline OER.As a result,the prepared electrocatalyst achieves low overpotential of 310 mV at 10 mA cm−2and small Tafel slope of 55.94 mV dec−1,demonstrating the exceptional electrocatalytic performance for alkaline OER.When integrated as the anode in an AEMWE cell,it delivers outstanding performance with only 1.657 V at 1.0 A cm−2and reaches high current density of 5.0 A cm−2at 1.989 V,surpassing those of commercial RuO2.The cell also shows excellent long-term durability over 100 h with minimal degradation.This study highlights the strong potential of rationally engineered oxide/sulfide heterostructures for next-generation alkaline water electrolysis. 展开更多
关键词 AEMWE Oxygen evolution reaction Transition metal Heterointerface Hollow structure
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Numerical Investigation of Fluid Energy Evolution Under the Wave-Induced Gap Resonance Between Stationary Floating Rectangular Structures 认领 引用
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作者 YU An-liang WANG Xin-yu +3 位作者 Domenico Davide MERINGOLO LIU Yong GONG Shao-dong WU Guo-xiang 《China Ocean Engineering》 SCIE EI CSCD 2026年第3期576-589,共14页
This study quantitatively examined the fluid energy evolution and dissipation process near narrow gaps formed between multiple floating rectangular structures under wave-induced gap resonance conditions.Given the limi... This study quantitatively examined the fluid energy evolution and dissipation process near narrow gaps formed between multiple floating rectangular structures under wave-induced gap resonance conditions.Given the limited understanding of gap resonance mechanisms through fluid energy analysis,a numerical wave flume based on theδ-LES-Smoothed Particle Hydrodynamics(SPH)approach was developed to investigate how incident wave and structural parameters influence the temporal evolution of fluid energy components.The findings reveal that for two floating boxes,the fluid energy dissipation within one wave period in the gap region between the boxes constitutes 81%of the total fluid energy dissipation in the fluid domain.This proportion remains consistent across varying incident wave heights under gap resonance conditions.The temporal distribution of fluid energy dissipation rate shows two peak values within one wave period,exhibiting significant waveform asymmetry.Additionally,in three-box configurations,the two narrow gap regions serve as primary zones of fluid energy dissipation,with energy dissipation patterns closely resembling those observed in the single gap region.Through comprehensive analysis of fluid energy evolution,this research advances the fundamental understanding of gap resonance mechanisms. 展开更多
关键词 multiple floating rectangular structures SPH method gap resonance wave energy evolution
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A comprehensive understanding of the structural evolution and capacity contribution of fast-charging NCM cathodes 认领 引用
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作者 Chao Wang Yuying Zhang +7 位作者 Zhenzhong Li Jianwen Wang Huiyan Zeng Jiajun Chen Yitao Liu Mengxian Li Shaofei Wang Chunzhen Yang 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2026年第3期183-193,共11页
Achieving extreme fast charging(XFC,-6 C)capability remains a challenge for Li ion batteries in electric vehicle applications.This work employs time-resolved X-ray diffraction(XRD)to investigate the structural evoluti... Achieving extreme fast charging(XFC,-6 C)capability remains a challenge for Li ion batteries in electric vehicle applications.This work employs time-resolved X-ray diffraction(XRD)to investigate the structural evolution and capacity contributions of a series of LiNixCoyMnzO2(x+y+z=1,NCM)cathodes under XFC conditions.All NCM cathodes(NCM-92,NCM-83,and NCM-622)deliver -60%of their capacities with less than 2%unit cell volume expansion during the H1-H2 phase transition,but the subsequent H2-H3 phase transition exhibits significant compositional and rate dependence.The NCM-92 cathode shows a maximum d-spacing shrinkage of-5.3%at 6 C,which is larger than that of NCM-83(-4.1%)and NCM-622(-0.05%).Furthermore,NCM-92 follows a“phase heterogeneity”pathway for its structural evolution above 4.2 V,distinct from the“solid-solution”pathway observed in NCM-83 and NCM-622.This phase heterogeneity is evidenced by the splitting of the(003)diffraction peak and a decrease in intensity during the H2-H3 phase transition,indicating the formation of lithium-rich/depleted domains.These findings establish a direct correlation between cathode composition,structural dynamics,and XFC performance,highlighting a critical trade-off between structural stability and fast-charging capability in nickel-rich layered oxides. 展开更多
关键词 Extreme fast charge(XFC)batteries Time-resolved X-ray diffraction(XRD) Structural evolutions Rate performance
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Structure deformation of Ni-Fe-Se enables efficient oxygen evolution via RE atoms doping 认领 引用 被引量：7
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作者 Hong-Rui Zhao Cheng-Zong Yuan +7 位作者 Cong-Hui Li Wen-Kai Zhao Fu-Ling Wu Lei Xin Hong Yin Shu-Feng Ye Xiao-Meng Zhang Yun-Fa Chen 《Rare Metals》 SCIE EI CAS CSCD 2025年第1期336-348,共13页
The development of cost-effective and highly stable electrocatalysts for oxygen evolution reactions holds paramount importance in practical hydrogen production.Herein,we present a novel self-supported electrode compri... The development of cost-effective and highly stable electrocatalysts for oxygen evolution reactions holds paramount importance in practical hydrogen production.Herein,we present a novel self-supported electrode comprising Ce-doped Ni-Fe-Se nanosheets grown on carbon cloth(Ni-Fe-Ce-Se/CC).This electrode was synthesized through a selenylation process,utilizing Ni-Fe-Ce-layered double hydroxide/carbon cloth(Ni-Fe-Ce LDH/CC)as the precursor.Notably,Ni-Fe-Ce-Se/CC electrode demonstrates remarkable performance,requiring a low overpotential of 300 mV to attain a current density of 100 mA·cm-2under harsh alkaline conditions.Furthermore,the electrode exhibits exceptional stability during continuous operation for 100 h.Insight into the underlying mechanisms was gained through a combination of experimental results and density functional theory calculations.Our findings reveal that Ce doping induces crystal structure deformation in Ni-Fe-Se and enhances electron enrichment around Ni atoms.This structural modification optimizes the adsorption energy of oxygen-based intermediates on the Ni-Fe-Se surface.This work offers a valuable strategy for regulating the electron transfer and adsorption capabilities of transition metal selenide electrocatalysts through RE atoms doping,opening new avenues for enhanced electrocatalytic performance. 展开更多
关键词 Ce doping Structure deformation Ni-Fe-Se Electron transfer Oxygen evolution
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Coordination structure regulation of Pt-NxOy-S1catalytic sites for promoting high-efficiency hydrogen evolution 认领 引用 被引量：2
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作者 Minmin Wang Chao Feng +4 位作者 Xin Zhang Ping He Houyu Zhu Yunqi Liu Yuan Pan 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2025年第3期661-669,共9页
The development of atomically dispersed platinum-based catalysts with high performance and welldefined active site structures is crucial for the commercialization of water electrolysis for hydrogen production.Herein,w... The development of atomically dispersed platinum-based catalysts with high performance and welldefined active site structures is crucial for the commercialization of water electrolysis for hydrogen production.Herein,we propose a coordination dual-shell synergistic regulation mechanism of coal pitchderived carbon-supported single atom Pt-NxOy-S1catalytic sites by a self-assembly-pyrolysis strategy for promoting hydrogen evolution reaction(HER).The Pt-N3O1-S1sites exhibited the highest HER performance,with an overpotential of 92 mV at a current density of 400 mA cm-2.At 50 mV,the turnover frequency was 34.04 s-1and the mass activity was 22.83 A mgPt-l,which is 63.4 times that of the 20%Pt/C catalyst.Theoretical calculations revealed that the coordination dual-shell impacts the electronic structure of the Pt atoms and the adsorption strength towards reactants synergistically.The S atoms in the second coordination shell weakened the strength of Pt-N first shell,resulting the more surface valence electrons around Pt atoms,exhibiting the most suitable adsorption free energy and enhancing the adsorption of H+on Pt-N3O1-S1sites,thus enhancing the electrocatalytic HER process by promoting Volmer step.This work reveals that coordination dual-shell synergistic regulation is an effective strategy for enhancing the electrocatalytic reaction process. 展开更多
关键词 Single-atom catalysts Hydrogen evolution reaction Self-assembly pyrolysis strategy Coordinationen vironment Electronic structure
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Design Guidelines for Composition of Brazing Filler Metals and Evolution Mechanisms of Typical Microstructures 认领 引用 被引量：10
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作者 Long Weimin 《稀有金属材料与工程》 SCIE EI CAS CSCD 北大核心 2025年第4期837-853,共17页
Brazing filler metals are widely applied,which serve as an industrial adhesive in the joining of dissimilar structures.With the continuous emergence of new structures and materials,the demand for novel brazing filler ... Brazing filler metals are widely applied,which serve as an industrial adhesive in the joining of dissimilar structures.With the continuous emergence of new structures and materials,the demand for novel brazing filler metals is ever-increasing.It is of great significance to investigate the optimized composition design methods and to establish systematic design guidelines for brazing filler metals.This study elucidated the fundamental rules for the composition design of brazing filler metals from a three-dimensional perspective encompassing the basic properties of applied brazing filler metals,formability and processability,and overall cost.The basic properties of brazing filler metals refer to their mechanical properties,physicochemical properties,electromagnetic properties,corrosion resistance,and the wettability and fluidity during brazing.The formability and processability of brazing filler metals include the processes of smelting and casting,extrusion,rolling,drawing and ring-making,as well as the processes of granulation,powder production,and the molding of amorphous and microcrystalline structures.The cost of brazing filler metals corresponds to the sum of materials value and manufacturing cost.Improving the comprehensive properties of brazing filler metals requires a comprehensive and systematic consideration of design indicators.Highlighting the unique characteristics of brazing filler metals should focus on relevant technical indicators.Binary or ternary eutectic structures can effectively enhance the flow spreading ability of brazing filler metals,and solid solution structures contribute to the formability.By employing the proposed design guidelines,typical Ag based,Cu based,Zn based brazing filler metals,and Sn based solders were designed and successfully applied in major scientific and engineering projects. 展开更多
关键词 design of brazing filler metals design guidelines for composition Ag based brazing filler metals eutectic structures evolution
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Theoretical Insights into the Atomic and Electronic Structures of Polyperyleneimide:On the Origin of Photocatalytic Oxygen Evolution Activity 认领 引用
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作者 Yi-Qing Wang Zhi Lin +1 位作者 Ming-Tao Li Shao-Hua Shen 《电化学（中英文）》 CAS 北大核心 2025年第5期28-36,共9页
Polymeric perylene diimide(PDI)has been evidenced as a good candidate for photocatalytic water oxidation,yet the origin of the photocatalytic oxygen evolution activity remains unclear and needs further exploration.Her... Polymeric perylene diimide(PDI)has been evidenced as a good candidate for photocatalytic water oxidation,yet the origin of the photocatalytic oxygen evolution activity remains unclear and needs further exploration.Herein,with crystal and atomic structures of the self-assembled PDI revealed from the X-ray diffraction pattern,the electronic structure is theoretically illustrated by the first-principles density functional theory calculations,suggesting the suitable band structure and the direct electronic transition for efficient photocatalytic oxygen evolution over PDI.It is confirmed that the carbonyl O atoms on the conjugation structure serve as the active sites for oxygen evolution reaction by the crystal orbital Hamiltonian group analysis.The calculations of reaction free energy changes indicate that the oxygen evolution reaction should follow the reaction pathway of H2O→*OH→*O→*OOH→*O2with an overpotential of 0.81 V.Through an in-depth theoretical computational analysis in the atomic and electronic structures,the origin of photocatalytic oxygen evolution activity for PDI is well illustrated,which would help the rational design and modification of polymeric photocatalysts for efficient oxygen evolution. 展开更多
关键词 Photocatalytic oxygen evolution Polymeric perylene diimide Atomic structure Electronic structure Reaction pathway
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Phase Morphology Evolution and Rheological Behavior of Toughened Polypropylene Composite with Controllable Brittle–Ductile Transition Temperature Using SEPS@HDPE Core–Shell Structure 认领 引用
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作者 Jiahao Shen Zhiyi Zhang +4 位作者 Wenwen Yu Jiayi Wang Weixuan Wang Yonggang Shangguan Qiang Zheng 《Engineering》 SCIE EI CSCD 2025年第7期128-135,共8页
The toughness of thermoplastic polymers such as polypropylene(PP)can be improved by adding elastomers-based toughening agents,and the phase morphology of these toughening agents is very important for the strength and ... The toughness of thermoplastic polymers such as polypropylene(PP)can be improved by adding elastomers-based toughening agents,and the phase morphology of these toughening agents is very important for the strength and toughness of PP.The low-temperature toughness of PP was improved by inserting high-density polyethylene(HDPE)between PP and polystyrene-b-ethylene-co-propyleneb-polystyrene(SEPS)to form an unusual SEPS@HDPE core–shell structure,with SEPS as the core and HDPE as the shell.Based on the microtopography and rheological behavior characterization,HDPE in PP/SEPS/HDPE composites was found to serve as an emulsifier,decrease the size of SEPS particles,and promote the homogeneous dispersion of dispersed phase particles in the matrix.An increase in the HDPE content shifted the toughening mechanism of PP composites from cavitation to matrix shear yielding.The reduction in the distance between the dispersed core–shell structure particles promoted shear yielding in the PP composites,leading to increased toughness.The creation of an intermediate HDPE layer with a moderate modulus was crucial for dispersing stress concentrations and significantly improving toughness without compromising the tensile strength.These findings will facilitate the fabrication of high-toughness PP products at low temperatures. 展开更多
关键词 Core-shell structure Low-temperature toughness Phase morphology evolution Rheological behavior
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Hollow Spherical Structure CoS2-xSex for Electrocatalytic Hydrogen Evolution Reaction 认领 引用
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作者 LIANG Dandan ZHANG Ying +3 位作者 HOU Weili SHANG Jihua REN Haibo SUN Yufeng 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS CSCD 2025年第4期1014-1021,共8页
A series of CoS2-xSex(x=0.05,0.1,0.2,0.3,and 2)composite catalysts were synthesized on carbon fiber paper via the hydrothermal method with Se doping.By precisely controlling the reaction temperature and Se dopin... A series of CoS2-xSex(x=0.05,0.1,0.2,0.3,and 2)composite catalysts were synthesized on carbon fiber paper via the hydrothermal method with Se doping.By precisely controlling the reaction temperature and Se doping level,a hollow spherical catalyst structure composed of CoSSe was successfully synthesized,which exhibited exceptional activity for hydrogen evolution in acidic solutions.The influences of Se doping on the microstructure and catalytic mechanism of hydrogen evolution reaction(HER)of these composites were systematically investigated.The experimental results reveal that the hollow spherical sample displays an overpotential value of 143 mV along with a Tafel slope value of 69.8 mV·dec-1at a current density of 10 mA·cm-2in an acid aqueous solution.Furthermore,it demonstrates remarkable cycling stability after undergoing 3000 cycles.The comprehensive analysis indicates that Se doping optimizes the electronic structure and enhances conductivity,meanwhile the unique hollow spherical architecture increases active sites for HER and significantly improves overall electrocatalytic performance. 展开更多
关键词 hydrogen evolution reaction electrocatalysis cobalt chalcogenides anion compound substitution hollow spherical structure
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Sugar transporter gene family:structure,evolution,and expression analysis in Beta vulgaris 认领 引用
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作者 Parviz Heidari Mostafa Ahmadizadeh Mohammadamin Hosseinzadeh 《Vegetable Research》 2025年第1期473-484,共12页
Sugar transporters are key mediators of the distribution of photosynthesis products in plant organs and play a key role in maintaining the sugar balance in cells.In this study,for the first time,all sugar transporters... Sugar transporters are key mediators of the distribution of photosynthesis products in plant organs and play a key role in maintaining the sugar balance in cells.In this study,for the first time,all sugar transporters in Beta vulgaris(BvSUTR)were identified and compared based on their structure and function.A total of 61 BvSUTR genes were identified,and they were classified into four subfamilies:sugar/inositol transporter,sucrose/H+symporter,nucleotide-sugar transporter,and sweet sugar transporter.Gene structures and physiochemical characteristics varied significantly across the phylogenetic groups,with a lower prevalence of phosphorylation regions detected in individuals belonging to group I and group V,which are part of the sweet sugar transporter subfamily.Additionally,there was a variation in the number of transmembrane helices from 5 to 12,notably fewer in the sweet sugar transporter subfamily.Moreover,the BvSUTR proteins displayed distinct three-dimensional structures and binding sites,where serine and leucine residues were found to be more prevalent in the binding locations.Analysis of the upstream region revealed that cis-regulatory elements related to growth,light,and abscisic acid(ABA)responsiveness are repeated in the promoter region of BvSUTRs.The expression profile revealed that SUTRs are less expressed in response to abiotic stresses.Analysis of the interaction network revealed that there is a strong interaction between sugar transporters and members of this gene family,which further influences the function of their other paralogs.The results of this research can be used in molecular research related to sugar beet breeding programs. 展开更多
关键词 evolution Beta vulgaris plant organs maintaining sugar balance structure sugar transporters photosynthesis products beta vulgaris bvsutr
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Multilevel structured CuCoP with synergistic catalytic active site designed for hydrogen evolution coupled gluconic acid synthesis 认领 引用 被引量：2
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作者 Xiang-Dong Ma Rui Liu +2 位作者 Shan Yue Hai-Jiao Xie Xiao-Hong Xia 《Rare Metals》 SCIE EI CAS CSCD 2025年第5期3141-3155,共15页
Hydrogen production coupled with small molecule oxidation derived by renewable energy power has been widely studied as an effective method to reduce energy consumption and prepare added value production.Here,the coppe... Hydrogen production coupled with small molecule oxidation derived by renewable energy power has been widely studied as an effective method to reduce energy consumption and prepare added value production.Here,the copper-cobalt phosphide with a multilevel structure has been designed based on the hard and soft acids and bases theory.The nanocone composed of lamellas presented a sharp tip,which a positive effect on the mass transfer enhanced by a local electric field,and the nanolamellas contain CoP/Cu3P interface provide the highly selective active site for the gluconic acid(GNA)synthesis and hydrogen evolution.The catalyst can drive hydrogen evolution at 5 A·cm-2up to 437 h without active decay,and the electrocatalytic glucose oxidation at anode presents high efficiency due to Cu(I)introduction and the synergetic effect between interfaces.Density functional theory(DFT)calculation shows that water splitting more readily occurs at the CoP,which provides adsorbed H and-OH for hydrogen evolution and glucose oxidation,respectively,and glucose adsorption more readily occurs at the Cu3P,which presents lower conversion energy for high value-added GNA.Efficient hydrogen evolution and glucose conversion indicate its high intrinsic activity and synergetic effect.This work provides a special interface construction strategy for the catalytic conversion of hydrogen and small molecules. 展开更多
关键词 Electrocatalysis Glucose oxidation Hydrogen evolution Multilevel structure Synergetic effect
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Defect modulation and in-situ exsolution in Y2Ru2O7@NiFeP/Ru heterostructure for enhanced oxygen evolution reaction 认领 引用 被引量：1
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作者 Eunsu Jang Jihoon Kim +2 位作者 Jangwoo Cho Jaeho Lee Jooheon Kim 《Rare Metals》 SCIE EI CAS CSCD 2025年第2期1014-1023,共10页
Pyrochlore oxide(Y2Ru2O7)has been identified as a promising catalyst for the oxygen evolution reaction(OER)in advanced green energy strategies.However,its electrochemical inertness necessitates the exploratio... Pyrochlore oxide(Y2Ru2O7)has been identified as a promising catalyst for the oxygen evolution reaction(OER)in advanced green energy strategies.However,its electrochemical inertness necessitates the exploration of an effective strategy to facilitate electronic modulation.This study proposes a surface modification approach involving the integration of defective NiFe(D-NiFe)nanoparticles onto a Y2Ru2O7(YRO)support(YRO@D-NiFeP/Ru)using a Prussian blue analog(PBA).Numerous cyanide(CN)vacancies are generated through the oxidation treatment of the NiFe PBA grown on the YRO support,yielding a defective PBA precursor(YRO@D-PBA).Subsequent annealing facilitates the transformation to the D-NiFe nanoparticles on the YRO support(YRO@D-NiFeP/Ru),which augments the exposure of Ni3+active sites beneficial for the OER.Moreover,the reduction of Ru cations from YRO results in the exsolution of Ru nanoparticles,which promotes synergistic charge transfer from the nanoparticles to the interior of Y2Ru2O7.Consequently,YRO@D-NiFeP/Ru exhibits a remarkable voltage of 1.49 V at 10 mA·cm−2 and the lowest Tafel slope of 42.4 mV·dec−1.In addition,a Zn–air battery constructed with YRO@D-NiFeP/Ru exhibits an outstanding power density of 136.2 mW·cm−2 and high charge–discharge stability,confirming the applicability of YRO@D-NiFeP/Ru in metal-air batteries. 展开更多
关键词 Pyrochlore oxide structure Prussian blue analog Defect structure Oxygen evolution reaction Znair battery
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Microstructure evolution and self-discharge degradation mechanism in Li/MnO2 primary batteries 认领 引用 被引量：1
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作者 Jia-Rui Zhang Cheng-Yu Li +5 位作者 Xiang Gao Jie Yin Cai-Rong Jiang Jian-Jun Ma Wen-Ge Yang Yong-Jin Chen 《Rare Metals》 SCIE EI CAS CSCD 2025年第2期1392-1400,共9页
Li/MnO2 primary batteries are widely used in industry for their high specific capacity and safety.However,a deep comprehension of the Li+insertion mechanism and the high self-discharge rate of the batteries is s... Li/MnO2 primary batteries are widely used in industry for their high specific capacity and safety.However,a deep comprehension of the Li+insertion mechanism and the high self-discharge rate of the batteries is still needed.Here,the storage mechanism of Li+in the tunnel structure of MnO2 as well as the dissolution and migration of Mn-ions were investigated based on multi-scale approaches.The Li/Mn ratio(at%)is determined at about 0.82 when the discharge voltage decreases to 2 V.The limited Li-ions transport rate in the bulk MnO2 restrains the reduction reaction,resulting in a low practical specific capacity.Moreover,utilizing spherical aberration-corrected transmission electron microscopy(TEM)coupled with electron energy loss spectroscopy(EELS),the presence of a mixed valence state layer of Mn2+/Mn3+/Mn4+on the surface of the original 20 nm MnO2 particles was identified,which could contribute to the initial dissolution of Mn-ions.The battery separator exhibited channels for Mn-ions migration and diffusion and aggregated Mn particles.We put forward the discharge and degradation route in the ways of Mn-ions trajectories,and our findings provide a deep understanding of the high self-discharge rates and the capacity decay of Li-Mn primary batteries. 展开更多
关键词 Li MnO primary batteries multi scale approaches primary batteries Li insertion mechanism self discharge degradation microstructure evolution tunnel structure Li Mn ratio
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High temperature deformation behavior and microstructure evolution of wrought nickel-based superalloy GH4037 in solid and semi-solid states 认领 引用 被引量：9
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作者 Ju-fu JIANG Guan-fei XIAO +2 位作者 Ying WANG Ying-ze LIU Ying ZHANG 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2020年第3期710-726,共17页
Cylindrical samples of Ni-based GH4037 alloy were compressed at solid temperatures(1200,1250 and 1300℃) and semi-solid temperatures(1340,1350,1360,1370 and 1380℃) with different strain rates of 0.01,0.1 and 1 s-1.Hi... Cylindrical samples of Ni-based GH4037 alloy were compressed at solid temperatures(1200,1250 and 1300℃) and semi-solid temperatures(1340,1350,1360,1370 and 1380℃) with different strain rates of 0.01,0.1 and 1 s-1.High temperature deformation behavior and microstructure evolution of GH4037 alloy were investigated.The results indicated that flow stress decreased rapidly at semi-solid temperatures compared to that at solid temperatures.Besides,the flow stress continued to increase after reaching the initial peak stress at semi-solid temperatures when the strain rate was 1 s-1.With increasing the deformation temperature,the size of initial solid grains and recrystallized grains increased.At semi-solid temperatures,the grains were equiaxed,and liquid phase existed at the grain boundaries and inside the grains.Discontinuous dynamic recrystallization(DDRX) characterized by grain boundary bulging was the main nucleation mechanism for GH4037 alloy. 展开更多
关键词 nickel-based superalloy high temperature deformation semi-solid microstructure evolution dynamic recrystallization
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Evolution of microstructure in semi-solid slurries of rheocast aluminum alloy 认领 引用 被引量：15
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作者 R.CANYOOK S.PETSUT +2 位作者 S.WISUTMETHA NGOON M.C.FLEMINGS J.WANNASIN 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS 2010年第9期1649-1655,共7页
Semi-solid metal processing is being developed in die casting applications to give several cost benefits. To efficiently apply this emerging technology, it is important to understand the evolution of microstructure in... Semi-solid metal processing is being developed in die casting applications to give several cost benefits. To efficiently apply this emerging technology, it is important to understand the evolution of microstructure in semi-solid slurries for the control of the theological behavior in semi-solid state. An experimental apparatus was developed which can capture the grain structure at different times at early stages to understand how the semi-solid structure evolves. In this technique, semi-solid slurry was produced by injecting fine gas bubbles into the melt through a graphite diffuser during solidification. Then, a copper quenching mold was used to draw some semi-solid slurry into a thin channel. The semi-solid slurry was then rapidly frozen in the channel giving the microstructure of the slurry at the desired time. Samples of semi-solid 356 aluminum alloy were taken at different gas injection times of 1, 5, 10, 15, 20, 30, 35, 40, and 45 s. Analysis of the microstructure suggests that the fragmentation by remelting mechanism should be responsible for the formation of globular structure in this rheocasting process. 展开更多
关键词 microstructure evolution rheocasting rapid quenching method 356 aluminum alloy gas induced semi-solid （GISS） formation mechanism
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