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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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Role of iron ore in enhancing gasification of iron coke:Structural evolution,influence mechanism and kinetic analysis 认领 引用 被引量：7
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作者 Jie Wang Wei Wang +4 位作者 Xuheng Chen Junfang Bao Qiuyue Hao Heng Zheng Runsheng Xu 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2025年第1期58-69,共12页
The utilization of iron coke provides a green pathway for low-carbon ironmaking.To uncover the influence mechanism of iron ore on the behavior and kinetics of iron coke gasification,the effect of iron ore on the micro... The utilization of iron coke provides a green pathway for low-carbon ironmaking.To uncover the influence mechanism of iron ore on the behavior and kinetics of iron coke gasification,the effect of iron ore on the microstructure of iron coke was investigated.Furthermore,a comparative study of the gasification reactions between iron coke and coke was conducted through non-isothermal thermogravimetric method.The findings indicate that compared to coke,iron coke exhibits an augmentation in micropores and specific surface area,and the micropores further extend and interconnect.This provides more adsorption sites for CO2 molecules during the gasification process,resulting in a reduction in the initial gasification temperature of iron coke.Accelerating the heating rate in non-isothermal gasification can enhance the reactivity of iron coke.The metallic iron reduced from iron ore is embedded in the carbon matrix,reducing the orderliness of the carbon structure,which is primarily responsible for the heightened reactivity of the carbon atoms.The kinetic study indicates that the random pore model can effectively represent the gasification process of iron coke due to its rich pore structure.Moreover,as the proportion of iron ore increases,the activation energy for the carbon gasification gradually decreases,from 246.2 kJ/mol for coke to 192.5 kJ/mol for iron coke 15wt%. 展开更多
关键词 low-carbon ironmaking iron coke gasification structural evolution kinetic model
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An experimental and computational investigation on structural evolution of the In2O3catalyst during the induction period of CO2hydrogenation 认领 引用 被引量：3
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作者 Zhangqian Wei Mingxiu Wang +6 位作者 Xinnan Lu Zixuan Zhou Ziqi Tang Chunran Chang Yong Yang Shenggang Li Peng Gao 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 2025年第5期301-313,共13页
As one of the most important industrially viable methods for carbon dioxide(CO2)utilization,methanol synthesis serves as a platform for production of green fuels and commodity chemicals.For sustainable methanol syn... As one of the most important industrially viable methods for carbon dioxide(CO2)utilization,methanol synthesis serves as a platform for production of green fuels and commodity chemicals.For sustainable methanol synthesis,In2O3is an ideal catalyst and has garnered significant attention.Herein,cubic In2O3nanoparticles were prepared via the precipitation method and evaluated for CO2hydrogenation to produce methanol.During the initial 10 h of reaction,CO2conversion gradually increased,accompanied by a slow decrease of methanol selectivity,and the reaction reached equilibrium after 10-20 h on stream.This activation and induction stage may be attributed to the sintering of In2O3nanoparticles and the creation of more oxygen vacancies on In2O3surfaces.Further experimental studies demonstrate that hydrogen induction created additional oxygen vacancies during the catalyst activation stage,enhancing the performance of In2O3catalyst for CO2hydrogenation.Density functional theory calculations and microkinetic simulations further demonstrated that surfaces with higher oxygen vacancy coverages or hydroxylated surfaces formed during this induction period can enhance the reaction rate and increase the CO2conversion.However,they predominantly promote the formation of CO instead of methanol,leading to reduced methanol selectivity.These predictions align well with the above-mentioned experimental observations.Our work thus provides an in-depth analysis of the induction stage of the CO2hydrogenation process on In2O3nano-catalyst,and offers valuable insights for significantly improving the CO2reactivity of In2O3-based catalysts while maintaining long-term stability. 展开更多
关键词 In2O3 CO2hydrogenation Methanol production Induction and activation Structural evolution
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Intricate Fault Systems in Longmenshan Structural Belt's Northern End:Exploring Structural Evolution and Seismic Rupture Behavior in the Eastern Tibetan Plateau 认领 引用
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作者 Hanyu Huang Renqi Lu +3 位作者 Dengfa He Jinliang Gao Weikang Zhang Lingyu Kang 《Journal of Earth Science》 SCIE CAS CSCD 2025年第1期250-265,共16页
The Longmenshan structural belt on the eastern edge of the Tibetan Plateau experienced the impactful Mw7.92008 Wenchuan Earthquake,causing a 350 km surface rupture.Traditional models attribute this to the Beichuan and... The Longmenshan structural belt on the eastern edge of the Tibetan Plateau experienced the impactful Mw7.92008 Wenchuan Earthquake,causing a 350 km surface rupture.Traditional models attribute this to the Beichuan and Pengguan faults,but our research reveals a complex fault system at the northern end,with inconsistencies in surface rupture,aftershock distribution,and focal mechanisms.We integrate shallow geology,active source seismic reflection,and magnetotelluric profiling to establish a deep structural model for the northern end of the Longmenshan structural belt.This area exhibits dominant reverse thrust nappe tectonics,and analyzing the tectonic evolution history provides insights into deformation propagation from the orogenic belt toward the Sichuan Basin.Focal mechanism analysis and relocated aftershock data reveals two distinct types of seismogenic structures in the northern end of the Longmenshan structural belt.In the middle to northern segments,the reverse fault type is attributed to reactivated pre-existing faults.Conversely,at the northern end,the strike-slip fault type originates from high-angle co-seismic rupture cutting through pre-existing reverse faults.This study enhances our understanding of fault complexity and seismic mechanisms in the northeastern Longmenshan structural belt,providing new insights into regional tectonics. 展开更多
关键词 Longmenshan structural belt fault system structural evolution tectonics earthquakes focal mechanism
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Pressure-induced structural evolution in dual-phase rare-earth high-entropy alloy with significantly different compressibility between two phases 认领 引用
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作者 Hangboce Yin Jun-Qiang Wang +7 位作者 Kai Zhang Shu Guo Nana Li Wujing Fu Juntao Huo Jianfei Sun Wenge Yang Yongjiang Huang 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2025年第34期268-274,共7页
1.Introduction Compared with the widely used vapor-compression refrigeration,solid-state cooling based on phase transition offers higher ef-ficiency,environmental friendliness,and smaller volume[1,2].The phase transit... 1.Introduction Compared with the widely used vapor-compression refrigeration,solid-state cooling based on phase transition offers higher ef-ficiency,environmental friendliness,and smaller volume[1,2].The phase transition of solid refrigerants can be triggered by external fields,i.e.,magnetic fields[3-5],electric fields[6,7]. 展开更多
关键词 solid refrigerants rare earth high entropy alloy phase transition pressure structural evolution compressibility solid state cooling dual phase
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Detecting the structural evolution of passive film induced by Shewanella oneidensis MR-1 using aberration-corrected TEM 认领 引用
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作者 Z.C.Hu X.X.Wei +4 位作者 B.Zhang D.K.Xu G.T.Zhang K.Tang X.L.Ma 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2025年第7期278-283,共6页
1.Introduction Microbiologically influenced corrosion(MIC)is the destruction of metal materials caused by the activity of microorganisms and the participation of biofilms[1].Global economic costs caused by marine corr... 1.Introduction Microbiologically influenced corrosion(MIC)is the destruction of metal materials caused by the activity of microorganisms and the participation of biofilms[1].Global economic costs caused by marine corrosion come to hundreds of billion dollars per year,with approximately 20% of corrosion losses caused by MIC[2].The MIC poses a serious threat to the integrity and safety of assets in the oil and gas industry,water industry,and nuclear waste storage facili-ties[3-5]. 展开更多
关键词 integrity safety assets marine corrosion Shewanella oneidensis MR aberration corrected TEM microbiologically influenced corrosion destruction metal materials structural evolution microbiologically influenced corrosion mic
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Construction and structural evolution of heterostructured cobalt-iron alloys@phosphates as oxygen evolution electrocatalyst toward rechargeable Zn-air battery 认领 引用
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作者 Yukang Xiong Lin Lv +3 位作者 Guokun Ma Hanbin Wang Houzhao Wan Hao Wang 《Chinese Journal of Structural Chemistry》 SCIE CAS CSCD 2025年第11期17-27,共11页
Addressing the kinetic limitations of oxygen evolution reaction(OER)is paramount for advancing rechargeable Zn-air batteries,thus it is extremely urgent to drive the development of effective and affordable electrocata... Addressing the kinetic limitations of oxygen evolution reaction(OER)is paramount for advancing rechargeable Zn-air batteries,thus it is extremely urgent to drive the development of effective and affordable electrocatalysts.This work constructs the interfacial structure of cobalt-iron alloys@phosphates(denoted as CoFe/CoFePO)as OER catalyst through a two-step approach using water-bath and hydrothermal methods,which demonstrated significant OER activity in alkaline media,requiring a low overpotential of 271 mV to achieve 10 mA cm−2 and exhibiting a competitive Tafel slope of 65 mV dec-1,alongside sustained operational stability.The enhanced performance can be attributed to the improved electrical conductivity due to the participation of CoFe alloys and the increased number of active sites through partial phosphorylation,which synergistically enhances charge transfer processes and accelerates OER kinetics.Moreover,dynamic structural evolution during OER process was thoroughly probed,and the results show that alloys@phosphates gradually evolve into phosphate radicalmodified CoFe hydroxyoxides that act as the actual active phase.Highlighting its practical applicability,the integration of prepared catalyst into zinc-air batteries leads to markedly improved performance,thereby offering promising new strategic directions for the development of next-generation OER electrocatalysts. 展开更多
关键词 Zn-air battery Electrocatalyst Interfacial structure Oxygen evolution reaction Structural evolution
Fe-lnduced Electronic Transfer and Structural Evolution of Lotus Pod-Like CoNiFePx@P,N-C Heterostructure for Sustainable Oxygen Evolution 认领 引用 被引量：9
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作者 Xiaojun Zeng Qingqing Zhang +2 位作者 Chulong Jin Hui Huang Yanfeng Gao 《Energy & Environmental Materials》 SCIE EI CAS CSCD 2024年第3期182-189,共8页
Transition metal phosphides with metallic properties are a promising candidate for electrocatalytic water oxidation,and developing highly active and stable metal phosphide-based oxygen evolution reaction catalysts is ... Transition metal phosphides with metallic properties are a promising candidate for electrocatalytic water oxidation,and developing highly active and stable metal phosphide-based oxygen evolution reaction catalysts is still challenging.Herein,we present a facile ion exchange and phosphating processes to transform intestine-like CoNiPx@P,N-C into lotus pod-like CoNiFePx@P,N-C heterostructure in which numerous P,N-codoped carboncoated CoNiFePxnanoparticles tightly anchors on the 2D carbon matrix.Meanwhile,the as-prepared CoNiFePx@P,N-C enables a core-shell structure,high specific surface area,and hierarchical pore structure,which present abundant heterointerfaces and fully exposed active sites.Notably,the incorporation of Fe can also induce electron transfer in CoNiPx@P,IM-C,thereby promoting the oxygen evolution reaction.Consequently,CoNiFePx@P,IM-C delivers a low overpotential of 278 mV(vs RHE)at a current density of10 mA cm-1and inherits excellent long-term stability with no observable current density decay after 30 h of chronoamperometry test.This work not only highlights heteroatom induction to tune the electronic structure but also provides a facile approach for developing advanced and stable oxygen evolution reaction electrocatalysts with abundant heterointerfaces. 展开更多
关键词 electronic transfer Fe exchange multi-metal phosphides OER electrocatalysts structural evolution
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Structural evolution of mesoporous graphene/LiNi1/3Co1/3Mn1/3O2 composite cathode for Li-ion battery 认领 引用 被引量：12
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作者 Wen-Jie Liu Xian-Zhong Sun +4 位作者 Xiong Zhang Chen Li Kai Wang Wen Wen Yan-Wei Ma 《Rare Metals》 SCIE EI CAS CSCD 2021年第3期521-528,共8页
Layered LiMO2(M=Ni,Co,and Mn) is a type of promising cathode materials for high energy density and high work voltage lithium-ion batteries.However,the poor rate performance and low power density hinder its further ... Layered LiMO2(M=Ni,Co,and Mn) is a type of promising cathode materials for high energy density and high work voltage lithium-ion batteries.However,the poor rate performance and low power density hinder its further applications.The capacity fade is related to the structural transformation in the layered LiMO2.In this work,the structural changes of bi-material cathode composed of mesoporous graphene and layered LiNi1/3Co1/3Mn1/3O2(NCM) were studied via in situ X-ray diffraction(XRD).During different C-rate charge-discharge test at the voltage range of 2.5-4.1 V,the composite cathode of NCM-graphene(NCM-G) reveals better rate performances than pure NCM cathode.The NCM-G composite electrode displays a higher rate capability of 76.7 mAh·g-1 at 5 C rate,compared to the pure NCM cathode of 69.8 mAh·g-1discharge capacity.The in situ XRD results indicate that a reversible phase transition from hexagonal H1 to hexagonal H2 occurs in layered NCM material during 1 C chargedischarge process.With the current increasing to 2 C/5 C,the structure of layered NCM material for both electrodes reveals few changes during charge and discharge processes,which indicates the less utilization of NCM component at high C-rates.Hence,the improved rate performance for bi-material electrode is attributed to the highly conductive mesoporous graphene and the synergistic effect of mesoporous graphene and NCM material. 展开更多
关键词 LiNi1/3Co1/3Mn1/3O2(NCM) Mesoporous graphene Bi-material In situ X-ray diffraction(XRD) Structural evolution
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Structural evolution and superconductivity tuned by valence electron concentration in the Nb-Mo-Re-Ru-Rh high-entropy alloys 认领 引用 被引量：9
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作者 Bin Liu Jifeng Wu +5 位作者 Yanwei Cui Qjnqing Zhu Guorui Xiao Siqi Wu Guang-han Cao Zhi Ren 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2021年第26期11-17,共7页
The crystal structure and physical properties of Nb25Mo5+xRe35Ru25-xRh10(0≤x≤10)and Nb5Mo35-yRe15+yRu35Rh10(0≤y≤15)high-entropy alloys(HEAs)have been studied by X-ray diffraction,elec... The crystal structure and physical properties of Nb25Mo5+xRe35Ru25-xRh10(0≤x≤10)and Nb5Mo35-yRe15+yRu35Rh10(0≤y≤15)high-entropy alloys(HEAs)have been studied by X-ray diffraction,electrical resistivity,magnetic susceptibility,and specific heat measurements.The results show that the former HEAs with valence electron concentration(VEC)values of 6.7-6.9 crystallize in a noncentrosymmetric cubicα-Mn structure,while the latter ones with VEC values of 7.1-7.25 adopt a centrosymmetric hexagonal close-packed(hcp)structure.Despite different structures,both series of HEAs are found to be bulk superconductors with a full energy gap,and the superconducting transition temperature Tc tends to decrease with the increase of VEC.Nevertheless,the Tc values of the hcp-type HEAs are higher than those of theα-Mn-type ones,likely due to a stronger electron phonon coupling.Furthermore,we show that VEC and electronegativity difference are two key parameters to control the stability ofα-Mn and hcp-type HEAs.These results not only are helpful for the design of such HEAs,but also represent the first realization of structurally different HEA superconductors without changing the constituent elements. 展开更多
关键词 High-entropy alloys Hcp toα-Mn structural evolution Superconducting properties Valence electron concentration Electronegativity difference
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Operando HERFD-XANES and surface sensitive Δμ analyses identify the structural evolution of copper(Ⅱ) phthalocyanine for electroreduction of CO2 认领 引用 被引量：7
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作者 Bingbao Mei Cong Liu +6 位作者 Ji Li Songqi Gu Xianlong Du Siyu Lu Fei Song Weilin Xu Zheng Jiang 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2022年第1期1-7,I0001,共7页
The quantitative understanding of how atomic-level catalyst structural changes affect the reactivity of the electrochemical CO2reduction reaction is challenging.Due to the complexity of catalytic systems,convention... The quantitative understanding of how atomic-level catalyst structural changes affect the reactivity of the electrochemical CO2reduction reaction is challenging.Due to the complexity of catalytic systems,conventional in situ X-ray spectroscopy plays a limited role in tracing the underlying dynamic structural changes in catalysts active sites.Herein,operando high-energy resolution fluorescence-detected X-ray absorption spectroscopy was used to precisely identify the dynamic structural transformation of well-defined active sites of a representative model copper(Ⅱ)phthalocyanine catalyst which is of guiding significance in studying single-atom catalysis system.Comprehensive X-ray spectroscopy analyses,including surface sensitive△μspectra which isolates the surface changes by subtracting the disturb of bulk base and X-ray absorption near-edge structure spectroscopy simulation,were used to discover that Cu species aggregated with increasing applied potential,which is responsible for the observed evolution of C2H4.The approach developed in this work,characterizing the active-site geometry and dynamic structural change,is a novel and powerful technique to elucidate complex catalytic mechanisms and is expected to con tribute to the rational design of highly effective catalysts. 展开更多
关键词 Operando HERFD-XANES △μanalysis Structural evolution Copper(Ⅱ)phthalocyanine Electrochemical CO2reduction reaction
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In-situ structural evolution of Bi2O3 nanoparticle catalysts for CO2 electroreduction 认领 引用 被引量：6
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作者 Hongbo Wang Chongyang Tang +6 位作者 Bo Sun Jiangchao Liu Yan Xia Wenqing Li Changzhong Jiang Dong He Xiangheng Xiao 《International Journal of Extreme Manufacturing》 SCIE EI CAS CSCD 2022年第3期113-120,共8页
Under the complex external reaction conditions,uncovering the true structural evolution of the catalyst is of profound significance for the establishment of relevant structure–activity relationships and the rational ... Under the complex external reaction conditions,uncovering the true structural evolution of the catalyst is of profound significance for the establishment of relevant structure–activity relationships and the rational design of electrocatalysts.Here,the surface reconstruction of the catalyst was characterized by ex-situ methods and in-situ Raman spectroscopy in CO2electroreduction.The final results showed that the Bi2O3 nanoparticles were transformed into Bi/Bi2O3 two-dimensional thin-layer nanosheets(NSs).It is considered to be the active phase in the electrocatalytic process.The Bi/Bi2O3 NSs showed good catalytic performance with a Faraday efficiency(FE)of 94.8%for formate and a current density of 26 mA cm−2 at−1.01 V.While the catalyst maintained a 90%FE in a wide potential range(−0.91 V to−1.21 V)and long-term stability(24 h).Theoretical calculations support the theory that the excellent performance originates from the enhanced bonding state of surface Bi-Bi,which stabilized the adsorption of the key intermediate OCHO∗ and thus promoted the production of formate. 展开更多
关键词 CO2electroreduction structural evolution electrocatalysis interface formic acid
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Anodic Oxidation on Structural Evolution and Tensile Properties of Polyacrylonitrile Based Carbon Fibers with Different Surface Morphology 认领 引用 被引量：7
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作者 Zhaorui Li Jianbin Wang +1 位作者 Yuanjian Tong Lianghua Xu 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2012年第12期1123-1129,共7页
Polyacrylonitrile(PAN)based carbon fibers with different surface morphology were electrochemically treated in 3 wt%NH4HCO3 aqueous solution with current density up to 3.47 A/m 2 at room temperature,and surface structu... Polyacrylonitrile(PAN)based carbon fibers with different surface morphology were electrochemically treated in 3 wt%NH4HCO3 aqueous solution with current density up to 3.47 A/m 2 at room temperature,and surface structures,surface morphology and residual mechanical properties were characterized.The crystallite size(La)of carbon fibers would be interrupted due to excessive electrochemical etching,while the crystallite spacing(d(002))increased as increasing current density.The disordered structures on the surface of carbon fiber with rough surface increased at the initial oxidation stage and then removed by further electrochemical etching,which resulting in continuous increase of the extent of graphitization on the fiber surface.However,the electrochemical etching was beneficial to getting ordered morphology on the surface for carbon fiber with smooth surface,especially when the current density was lower than 1.77 A/m 2.The tensile strength and tensile modulus could be improved by 17.27%and 5.75%,respectively,and was dependent of surface morphology.The decreasing density of carbon fibers probably resulted from the volume expansion of carbon fibers caused by the abundant oxygen functional groups intercalated between the adjacent graphite layers. 展开更多
关键词 Carbon fibers Anodic oxidation Structural evolution Tensile property Surface morphology
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Structural Evolution of Chepaizi Uplift and its Control on Stratigraphic Deposition in the Western Junggar Basin,China 认领 引用 被引量：5
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作者 NI Minjie CHEN Shi +3 位作者 LIU Zichao SHANG Fengkai QI Jiafu WANG Lishuang 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 2019年第4期1060-1075,共16页
Geological mapping,interpreted cross sections,structural analyses and residual thickness maps were used to characterize the evolution of stress setting,structure and stratigraphic distribution of the Chepaizi Uplift,w... Geological mapping,interpreted cross sections,structural analyses and residual thickness maps were used to characterize the evolution of stress setting,structure and stratigraphic distribution of the Chepaizi Uplift,which is a NW-SE trending structure located in the Western Junggar Basin.The NS-trending faults show an important transpressional phase during the Late Permian,as demonstrated by tectonic stress field and stratigraphic thickness variations.A major compressional thrusting and strike-slip phase during the Late Jurassic created a series of NW-SE faults that originated by the large-scale uplift event in the Northern Tianshan.Faults were reactivated as thrust and dextral strike-slip faults.In addition,the angular unconformity observed between Jurassic and Cretaceous provide evidence of this tectonic event.Lots of normal faults indicate that the area records southward tilting and regional derived extensional stress that took place during the Neogene.Before that,thick Early Cenozoic strata are widely deposited.The balanced cross-section highlights the evolution of stress setting and stratigraphic distribution of the Chepaizi Uplift. 展开更多
关键词 structural evolution seismic section Junggar Basin Chepaizi Uplift Northern Tianshan
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Rapid structural evolution of Dendrobium mitogenomes and mito-nuclear phylogeny discordances in Dendrobium(Orchidaceae) 认领 引用 被引量：3
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作者 Meng-Ting Wang Zhen-Yu Hou +5 位作者 Chao Li Jia-Peng Yang Zhi-Tao Niu Qing-Yun Xue Wei Liu Xiao-Yu Ding 《Journal of Systematics and Evolution》 SCIE CAS CSCD 2023年第5期790-805,共16页
Reconstructing mitochondrial genomes of angiosperms is extremely intricate due to frequent recombinations which give rise to varied sized in Dendrobium mitogenomes and their structural variations,even in most orchid s... Reconstructing mitochondrial genomes of angiosperms is extremely intricate due to frequent recombinations which give rise to varied sized in Dendrobium mitogenomes and their structural variations,even in most orchid species.In this study,we first sequenced two complete and five draft mitochondrial genomes of Dendrobium using next-generation and third-generation sequencing technologies.The mitochondrial genomes were 420538-689048 bp long,showing multipartite(multichromosomal)structures that consisted of variably sized circular or linear-mapping isoforms(chromosomes).The comparison of mitochondrial genomes showed frequent gene losses in Dendrobium species.To explore structure variations of mitochondrial genomes in vivo,we quantified copy numbers of five mitochondrial genes and DNA contents per mitochondrion.The gene copy numbers and the DNA contents showed extreme differences during Dendrobium development,suggesting dynamic structures of mitochondrial genomes.Furthermore,phylogenetic relationships of 97 accessions from 39 Dendrobium species were constructed based on 12 nuclear single-copy genes and 15 mitochondrial genes.We discovered obvious discordance between the nuclear and mitochondrial trees.Reticulate evolution was inferred from the species network analysis in Dendrobium.Our findings revealed the rapid structural evolution of Dendrobium mitochondrial genomes and the existence of hybridization events in Dendrobium species,which provided new insights into in vivo structural variations of plant mitochondrial genomes and the strong potential of mitochondrial genes in deciphering plant evolution history. 展开更多
关键词 Dendrobium mitochondrial genome phylogenetic discordance structural evolution
MnFe(PGe) compounds: Preparation, structural evolution,and magnetocaloric effects 认领 引用 被引量：2
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作者 岳明 张红国 +1 位作者 刘丹敏 张久兴 《Chinese Physics B》 SCIE EI CAS CSCD 2015年第1期9-19,共11页
The interdependences of preparation conditions, magnetic and crystal structures, and magnetocaloric effects （MCE） of the MnFePGe-based compounds are reviewed. Based upon those findings, a new method for the evaluati... The interdependences of preparation conditions, magnetic and crystal structures, and magnetocaloric effects （MCE） of the MnFePGe-based compounds are reviewed. Based upon those findings, a new method for the evaluation of the MCE in these compounds, based on differential scanning calorimetry （DSC）, is proposed. The MnFePGe-based compounds are a group of magnetic refrigerants with giant magnetocaloric effect （GMCE）, and as such, have drawn tremendous attention, especially due to their many advantages for practical applications. Structural evolution and phase transformation in the compounds as functions of temperature, pressure, and magnetic field are reported. Influences of preparation conditions upon the homogeneity of the compounds＇ chemical composition and microstructure, both of which play a key role in the MCE and thermal hysteresis of the compounds, are introduced. Lastly, the origin of the ＂virgin effect＂ in the MnFePGe- based compounds is discussed. 展开更多
关键词 MnFePGe-based compounds magnetocaloric effect structural evolution thermal hysteresis vir- gin effect
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Structural Evolution of Ultra-High Molecular Weight Polyethylene Low-Entangled Films with Reserved Shish Crystals During Hot Stretching 认领 引用 被引量：2
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作者 Jia-Wei Gao Li Chen +3 位作者 Ye-Shun Zhong Chao-Wei Xing Yi-Guo Li Zong-Bao Wang 《Chinese Journal of Polymer Science》 SCIE EI CAS CSCD 2024年第8期1227-1242,共16页
Shish crystals are crucial to achieving high performance low-dimensional ultra-high molecular weight polyethylene(UHMWPE)products.Typically,high stretch and shear flow fields are necessary for the formation of shish c... Shish crystals are crucial to achieving high performance low-dimensional ultra-high molecular weight polyethylene(UHMWPE)products.Typically,high stretch and shear flow fields are necessary for the formation of shish crystals.In this study,UHMWPE gel films with reserved shish crystals were prepared by gel molding,the structural evolution and properties of UHMWPE films stretched at temperatu res of 100,110,120and 130℃were investigated by in situ small-angle X-ray scattering(SAXS)/ultra-small-angle X-ray scattering(USAXS)/wide-angle X-ray diffraction(WAXD)measu rements as well as scanning electron microscopy(SEM)and differential scanning calorimetry(DSC)measurements.Our findings showed that the reserved shish crystals can facilitate the formation and structural evolution of shish-kebab crystals during the hot stretching.Additionally,the reserved shish crystals promote the structu ral evolution of UHMWPE films to a greater extent when stretched at 120 and 130℃,compared to 100 and 110℃,resulting in higher crystallinity,orientation,thermal properties,breaking strength and Young's modulus.Com pared to UHMWPE high-entangled films with reserved shish crystals prepared by compression molding,UHMWPE low-entangled films with reserved shish crystals prepared by gel molding are more effective in inducing the formation and evolution of shish-kebab crystals during the hot stretching,resulting in increased breaking strength and Young's modulus. 展开更多
关键词 UHMWPE low-entangled films Reserved shish crystals Structural evolution Hot stretching
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Unraveling the Dynamic Structural Evolution of Phthalocyanine Catalysts during CO2 Electroreduction 认领 引用 被引量：2
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作者 Jianing Mao Bingbao Mei +6 位作者 Ji Li Shuai Yang Fanfei Sun Siyu Lu Wei Chen Fei Song Zheng Jiang 《Chinese Journal of Structural Chemistry》 SCIE CAS CSCD 2022年第10期82-88,共7页
Understanding the atomic and electronic changes of active sites promotes the whole new sight into electrochemical carbon dioxide reduction reaction(CO2RR),which provides a feasible strategy to achieve carbon neutra... Understanding the atomic and electronic changes of active sites promotes the whole new sight into electrochemical carbon dioxide reduction reaction(CO2RR),which provides a feasible strategy to achieve carbon neutrality.Here we employ operando high-energy resolution fluorescence-detected Xray absorption spectroscopy(HERFD-XAS)to track the structural evolution of Ni(II)phthalocyanine(NiPc),considered as the model catalysts with uniform Ni-N4-C8 moiety,during the CO2RR.The HERFD-XAS method is in favor of elucidating the interaction of the reactant/catalyst interface from the atomic electronic structure dimension,facilitating the establishment of the catalytic mechanism and the dynamic structure changes.Based on operando measurement,surface sensitive difference spectra(△μ)and spectroscopy simulation,the interfacial interactions between the active sites of NiPc and reactants are monitored and the Ni species gradually reduced by increasing the applied potential is discovered.HERFD-XAS method offers an advanced and powerful tool for elucidating the complex catalytic mechanism in further various systems. 展开更多
关键词 CO2electrochemical reduction HERFD-XAS model catalysts difference spectra structural evolution
Structural Evolution and Characterization of Modulated Structure for Alite Doped with MgO 认领 引用 被引量：1
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作者 MIN Hui-Hua LIU Yun-Fei +2 位作者 LU Hong-Jiang ZHU Jian-Min LV Yi-Nong 《无机化学学报》 SCIE CAS CSCD 北大核心 2012年第11期2444-2450,共7页
Structural evolution for alite with various doping amounts of MgO was investigated via X-ray diffraction(XRD)and transmission electron microscopy(TEM).T1 and M1 coexist in alite with MgO doping of 0.5wt%,M1 was stabil... Structural evolution for alite with various doping amounts of MgO was investigated via X-ray diffraction(XRD)and transmission electron microscopy(TEM).T1 and M1 coexist in alite with MgO doping of 0.5wt%,M1 was stabilized with MgO doping of 1.0wt%,and M3 was stabilized with MgO doping above 1.5wt%.The pesudohexagonal subcells lattice constants of all the modifications were calculated based on XRD data,and they were nearly identical.Modulated structures in each modification were observed via selected area electron diffraction(SAED)and high resolution transmission electron microscopy(HRTEM).The coordinates of the supercell reflections in various modifications were described as relative linear expressions and the modulated structures were observed in HRTEM images as wavy contrast streakings parallel to the corresponding subcell planes. 展开更多
关键词 alite modulated structure transmission electron microscopy structural evolution
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Structural Evolution and Electronic Properties of Au2Gen-/0(n=1-8)Clusters:Anion Photoelectron Spectroscopy and Theoretical Calculations 认领 引用 被引量：1
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作者 Sheng-Jie Lu Umar Farooq +2 位作者 Hong-Guang Xu Xi-Ling Xu Wei-Jun Zheng 《Chinese Journal of Chemical Physics》 SCIE EI CAS CSCD 2019年第2期229-240,I0003,共12页
Investigating the structures and properties of Au-Ge mixed clusters can give insight into the microscopic mechanisms in gold-catalyzed Ge films and can also provide valuable information for the production of germanium... Investigating the structures and properties of Au-Ge mixed clusters can give insight into the microscopic mechanisms in gold-catalyzed Ge films and can also provide valuable information for the production of germanium-based functional materials.In this work,size-selected anion photoelectron spectroscopy and theoretical calculations were used to explore the structural evolution and electronic properties of Au2Gen^-/0(n=1-8)clusters.It is found that the two Au atoms in Au2Gen^-/0(n=1-8)showed high coordination numbers and weak aurophilic interactions.The global minima of Au2Gen-anions and Au2Gen neutrals are in spin doublet and singlet states,respectively.Au2Gen-anions and Au2Gen neutrals showed similar structural features,except for Au2Ge4^-/0 and Au2Ge5^-/0.The C2v symmetric V-shaped structure is observed for Au2Ge1^-/0,while Au2Ge2^-/0 has a C2v symmetric dibridged structure.Au2Ge3^-/0 can be viewed as the two Au atoms attached to different Ge-Ge bonds of Ge3 triangle.Au2Ge4-has two Au atoms edge-capping Ge4 tetrahedron,while Au2Ge4 neutral adopts a C2v symmetric double Au atoms face-capping Ge4 rhombus.Au2Ge5-8^-/0 show triangular,tetragonal,and pentagonal prism-based geometries.Au2Ge6 adopts a C2v symmetric tetragonal prism structure and exhibitsσplusπdouble bonding characters. 展开更多
关键词 Photoelectron spectroscopy Transition metal Germanium cluster Structural evolution Quantum chemical calculations
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