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Quantum transport signatures of non-trivial topological edge states in a ring-shaped Su–Schrieffer–Heeger double-chain system

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Chinese Physics B 2022年第2期31卷 558-565页

作者： Cheng-Zhi Ye Lan-Yun Zhang Hai-Bin Xue School of Physics and Electronic Engineering Linyi UniversityLinyi 276005China Key Laboratory of Interface Science and Engineering in Advanced Materials Ministry of EducationTaiyuan University of TechnologyTaiyuan 030024China

In the ring-shaped Su–Schrieffer–Heeger(SSH)double-chain,the quantum interference between the two different electron tunneling paths of the upper and lower chains has an important influence on the electron transport properties of non-trivial topological edge ***,we have studied the electron transport signatures of non-trivial topological edge states in a ring-shaped SSH double-chain system based on the wave-guide theory and transfer-matrix *** the ringshaped SSH double-chain with the upper chain being different from the lower one,it is demonstrated that the electron transmission probability displays the four and two resonance peaks associated with the non-trivial topological edge states in the weak and strong coupling regimes,*** in the case of the upper chain being the same as the lower one,the two transmission resonance peaks associated with the non-trivial topological edge states in the weak coupling regime are only found,and that in the strong coupling regime disappear that originated from the destructive interference between the two different electron tunneling paths of the upper and lower ***,the variation of the number of transmission resonance peaks associated with the non-trivial topological edge states in the weak and strong coupling regimes suggests that an alternative scheme for detecting non-trivial topological edge states in the ring-shaped SSH doublechain system.

关键词： ring-shaped Su-Schrieffer-Heeger double-chain non-trivial topological edge states transmission probability

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In situ regulating intimately connected heterostructure by decomposition of solid solution oxides toward high-efficient water oxidation

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Rare Metals 2024年第4期43卷 1557-1569页

作者： Shao-Fei Zhang Xiao-Lu Yin Jin Wang Jian-Li Kang Tian-Tian Li Jin-Feng Sun Yong-Qiang Meng Jian-Jiang Wang Dian-Long Wang Kai-Qiang Qin Hebei Key Laboratory of Flexible Functional Materials/Hebei Key Laboratory of Material Near-Net Forming Technology School of Materials Science and EngineeringHebei University of Science and TechnologyShijiazhuang050018China Key Laboratory of Advanced Ceramics and Machining Technology/Ministry of Education School of Materials Science and EngineeringTianjin UniversityTianjin300072China Electrochemical Engine Center Department of Mechanical EngineeringPennsylvania State UniversityUniversity ParkPA16802USA

Heterogeneous interfaces produced by interdomain interactions on a nanoscale performs a crucial role in boosting the properties of an electrocatalyst toward oxygen evolution reaction(OER)***,a series of dual-phase electrodes with intimately connected heterointerfaces are prepared by in situ decomposing solid solution oxide of Ni_(x)Co_(y)Fe_(100-x-y)O,which grew on Ni foam massively via an ultrafast combustion ***,with high-reaction kinetics caused by the reduction treatment at 450℃,the less electronegative Fe and Co are more oxyphilic than Ni,which facilitated their co-exsolution and formation of CoFe_2O_4/NiO oxide with enriched oxygen *** from the nanoporous framework,heterojunction structure,and oxygen defects,the self-supporting electrodes present rapid charge/mass transmission and provide abundant active sites for *** optimized sample(R-SNCF4.5)shows low overpotentials of 226 and 324 mV at 10 and100 mA·cm^(-2),a small Tafel slope(46.7 mV·dec^(-1)),and excellent *** assembled R-SNCF4.5//Pt/C/NF electrolyzer demonstrates continuous electrolysis over 50 h at a current density of 10 mA·cm^(-2),under 1.51 *** functional theory(DFT)calculations verify that the strong electronic modulation plays a critical part in the CoFe_2O_4/NiO hybrid by lowering the energy barriers for the ratedetermining steps,and Fe sites are the most active OER sites.

关键词： Rapid combustion Decomposition of solid solution oxide Dual-phase heterostructure Oxygen evolution reaction Theoretical calculation

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Tunable Phase Structure of Side-chain Liquid Crystalline Polymers Enabled by Molecular engineering of Dual Mesogenic Cores

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Chinese Journal of Polymer science 2024年第10期42卷 1459-1469,I0009页

作者： Wen-Huan Yao Lan-Sheng Liu Jie Zhao Yan-Xia Wang An-Zhi Ma Zheng-Rui Ma Lan-Ying Zhang Ruo-Chen Lan College of Chemistry and Chemical Engineering Hunan UniversityChangsha410082China Key Laboratory of Eco-Functional Polymer Materials of the Ministry of Education Key Laboratory of Eco-Environmental Polymer Materials of Gansu ProvinceCollege of Chemistry and Chemical EngineeringNorthwest Normal UniversityLanzhou730070China Department of Materials Science and Engineering College of EngineeringPeking UniversityBeijing100871China Institute of Advanced Materials&Key Lab of Fluorine and Silicon for Energy Materials and Chemistry of Ministry of Education College of Chemistry and Chemical EngineeringJiangxi Normal UniversityNanchang330022China

A series of novel side-chain liquid crystalline(SCLC)copolymers were synthesized by attaching two distinct mesogenic units,namely a chiral cholesteryl-based monomer(M1)and an achiral biphenyl-based monomer(M2),to a poly(3-mercaptopropylmethylsiloxane)(PMMS)backbone via thiol-ene click *** influence of side chain composition on the self-assembly behavior and phase structures of these SCLC copolymers was systematically investigated using different *** indicate that three distinct liquid crystalline phases and four unique molecular configurations were identified within the polymer series,with the emergence of the liquid crystalline phase being a synergistic outcome of the two distinct side *** study underscores the critical influence of side chain dimensions,rigidity,and spatial volume on the self-assembly structures and phase characteristics of liquid crystalline polymers,providing valuable insights for the rational design and development of advanced functional materials with tailored properties.

关键词： Liquid crystalline copolymers Self-assembly Phase structure Chiral molar ratio

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A Directional Locomotion Control of Cyborg Locusts for Complex Outdoor Environments

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Journal of Bionic engineering 2025年第2期22卷 596-607页

作者： Xin Huang Tiancheng Li Kaixuan Sun Meisong Yuan Bo Yang School of Instrument Science and Engineering Southeast UniversityNanjing210096China Key Laboratory of Micro-Inertial Instruments and Advanced Navigation Technology Ministry of EducationNanjing210096China

The ability of cyborg locusts to achieve directional movement in complex outdoor environments is critical for search and rescue ***,there is a lack of research on motion control for cyborg locusts in outdoor *** this study,we developed cyborg locusts capable of performing directional locomotion in intricate outdoor environments,including jumping over obstacles,climbing slopes,traversing narrow pipelines,and accurately reaching predetermined targets along specified *** designed a miniature electrical backpack(10 mm×10 mm,0.75 g)capable of receiving stimulus parameters(frequency,duty ratio,and stimulation time)via Bluetooth commands from mobile *** stimulation of locust sensory organs,such as the antennae and cercus,induced turning and jumping ***-mental testing of locust movement control was conducted under outdoor conditions with a short electrical stimulation *** showed a positive correlation between locust turning angles and electrical stimulation parameters within a specified range,with an average jumping height exceeding 10 ***,the success rate of locust turning and jumping behaviors correlated positively with the interval time between electrical *** these intervals during forward crawling phases increased the likelihood of the locusts jumping *** conclusion,this study success-fully achieved directional locomotion control of cyborg locusts outdoors,providing insights and references for advancing search and rescue capabilities.

关键词： Cyborg locusts Turning and jumping control Directional locomotion Search and rescue

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Achieving a large field-induced polarization and energy density in BaTiO_(3)films sputter-deposited on Si at 200℃ via a buffer-layer technique

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Journal of advanced Ceramics 2025年第3期14卷 69-78页

作者： Chao Liu Jun Ouyang Yuyao Zhao Hanfei Zhu Hongbu Cheng Zhenyan Liang Li Wang Institute of Advanced Energy Materials and Chemistry Jinan Engineering Laboratory for Multi-scale Functional MaterialsShandong Provincial Key Laboratory of Molecular EngineeringSchool of Chemistry and Chemical EngineeringQilu University of Technology(Shandong Academy of Sciences)Jinan 250353China Key Laboratory of Key Film Materials&Application for Equipments(Hunan Province) Hunan Provincial Key Laboratory of Thin Film Materials and DevicesSchool of Material Sciences and EngineeringXiangtan UniversityXiangtan 411105China Key Laboratory for Liquid–Solid Structure Evolution and Processing of Materials(Ministry of Education) School of Materials Science and EngineeringShandong UniversityJinan 250061China

Ferroelectric oxide films with a large field-induced polarization can be used in dielectric capacitors for charge or energy storage in microelectronic systems and hence have attracted intense research interest.A high processing temperature is usually required to produce a well-crystallized polar phase and hence a large polarization in the film,corresponding to a high charge or energy ***,high processing temperature not only reduces the charge‒discharge efficiency by producing a sizable remnant polarization but is also incompatible with the integration *** this study,we address this problem by creating a large field-induced polarization(~55.8μC/cm^(2))in BaTiO_(3)films sputter-deposited on Si at 200℃ via a buffer-layer *** large polarization led to a high energy density and efficiency(Wrec≈94.7 J/cm^(3),η≈78.2%@4 MV/cm).The thickness of LaNiO_(3)buffer layer was revealed to be the key factor determining the electric polarization(remnant and field-induced ones).A 50 nm LaNiO_(3)thickness,corresponding to the aforementioned polarization and energy storage performance,not only ensures proper crystallization in the BaTiO_(3)film,but also leads to an optimal combination of polycrystalline grains with a high dielectric *** latter accounts for the majority of the field-induced *** results revealed the key role of a buffer layer in tuning the microstructure of a low-temperature deposited ferroelectric oxide ***,the excellent charge/energy storage performance of these 200℃-deposited BaTiO_(3)films has provided many opportunities for this simple dielectric in microelectronics.

关键词： ferroelectric oxide films field-induced polarization BaTiO_(3) LaNiO3 energy density

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The Study of Extrusion Casting on the Microstructure and Properties of Hypereutectic Al-Si Alloy 75

The Study of Extrusion Casting on the Microstructure and Pro...

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75th World Foundry Congress, WFC 2024

作者： Zhang, Yunguan You, Zhiyong Zhang, Mengjun Wang, Libo Liu, Chunlian School of Materials Science and Engineering Taiyuan University of Technology Taiyuan030024 China Key Laboratory of Interface Science and Engineering in Advanced Materials Ministry of Education Taiyuan University of Technology Taiyuan030024 China

In this study, P and Sr composite modified hypereutectic Al-Si alloy samples were prepared by gravity casting and extrusion casting, with extrusion ratios of 400 MPa, 500 MPa, and 600 MPa. The microstructure and properties of hypereutectic aluminum-silicon alloy under gravity casting and different extrusion ratios were studied. The results show that the properties of extrusion cast alloys are better than those of gravity cast alloys, and as the extrusion ratio increases, the refinement effect on the silicon phase becomes better. Under an extrusion ratio of 600 MPa, the refinement effect on primary silicon and eutectic silicon is the best, with the primary silicon partially becoming blunt, decreasing in quantity, and having small dimensional differences with an average size of 29 μm. The density of eutectic silicon increases, and the alloy has good mechanical properties under this condition, with a tensile strength of 316 MPa, an elongation of 1.94%, and a hardness of 115.1 HV. © 2024 75th World Foundry Congress, WFC 2024. All rights reserved.

关键词： Tensile strength

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Constructing a 3D multichannel structure to enhance performance of Ni–Co–Mn hydroxide electrodes for flexible supercapacitors

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Rare Metals 2024年第1期43卷 148-163页

作者： Zhi-Hui Xu Shi-Shuai Sun Xue-Lei Li Zhi-Hui Zhang Hai-Ying Li Shuang-Ting Ruan Shou-Gen Yin Key Laboratory of Display Materials and Photoelectric Devices(Ministry of Education)and Tianjin Key Laboratory for Photoelectric Materials and Devices School of Materials Science and EngineeringTianjin University of TechnologyTianjin 300384China College of Science Tianjin University of TechnologyTianjin 300384China School of Materials Science and Engineering Inner Mongolia University of TechnologyHohhot 010051China

The balancing of the electrochemical performance,mechanical stability,and processing technology for applying supercapacitors to flexible and wearable electronics continues to encounter severe ***,we prepare Ni-Co-Mn hydroxide electrodes with a threedimensional multichannel structure via a simple hydrothermal *** are constructed using vertically contiguous nano sheets with a uniform thickness and rough *** electrodes can provide numerous electroactive sites and accelerate the transmission of electrolyte *** relationship between the structure and electrochemical performances is verified by experiments and theoretical ***-dimensional(2D)planar and one-dimensional(1D)fiber electrodes are prepared using a flexible carbon cloth(CC)and carbon fiber(CF),respectively,as *** assembled quasi-solid-state flexible asymmetric supercapacitor(FASC)with a twodimensional sandwich structure using NiCoMn-OH/CC as the electrode achieves a remarkable energy density of73.8 Wh·kg^(-1)at a power density of 1.03 kW·kg^(-1).The quasi-solid-state FASC with a 1D linear structure using NiCoMn-OH/CF as the electrode also attains a high energy density(12.9 Wh·kg^(-1)at a power density of0.75 W·kg^(-1)).Moreover,the electrochemical performances of the NiCoMn/CC//AC/CC and NiCoMn/CF//AC/CF FASCs are not disturbed at different bending angles(0°,45°,90°,135°and 180°),This indicates the superior flexibility of the *** also assemble a self-powered energy-harvesting storage system by integrating FASCs and commercial solar cells to verify its *** displays sustainable development potential for energy storage.

关键词： Supercapacitors Flexible Ni–Co–Mn hydroxide 3D multichannel structure High performances

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NiCoFeCu medium-entropy alloy nanoparticles encapsulated in carbon nanotubes as catalysts for enhancing the hydrogen desorption of MgH_(2)

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Rare Metals 2024年第11期43卷 5868-5879页

作者： Ya-Fei Liu Yi-Ke Huang Yu-Sang Guo Meng-Yuan Yue Hua-Xu Shao Yi-Jing Wang Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education) Renewable Energy Conversion and Storage CenterCollaborative Innovation Center of Chemical Science and Engineering(Tianjin)College of ChemistryNankai UniversityTianjin 300071China

Recently,high/medium-entropy alloys(HEAs/MEA s)have been considered attractive catalysts due to their unique physicochemical ***,the synthesis of nano-sized HEAs/MEAs catalysts with desirable morphology presents significant ***,we report the synthesis of NiCoFeCu MEA nanoparticles encapsulated in nitrogen-doped carbon nanotubes(NCTs)via a straightforward one-step pyrolysis *** unique structure of NiCoFeCu/NCTs and the nano-sized MEA catalysts contributes to the improved hydrogen desorption kinetics of MgH_(2).The onset dehydrogenation temperature of the MgH_(2)-NiCoFeCu/NCTs composite decreased to 173.4℃,a reduction of 117.4℃compared to pure MgH_(2).The MgH_(2)-NiCoFeCu/NCTs composite could release 6.50 wt%H_(2)within 30 min at 325℃.Furthermore,an activation energy of 116.3 kJ·mol^(-1)for the MgH_(2)-NiCoFeCu/NCTs composite has been obtained,much lower than pure milled MgH_(2),demonstrating an enhanced hydrogen desorption ***,the exceptional dispersion capability of the carbon material contributes to outstanding cyclic stability without any loss of capacity even after 10 cycles of de/hydrogenation at300℃.

关键词： Hydrogen storage Magnesium hydride Medium-entropy alloy Catalytic effect

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Distinct Electrical and Mechanical Responses of a Cu-10Fe Composite Prepared by Hot-Pressed Sintering and Post Treatment

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Acta Metallurgica Sinica(English Letters) 2024年第2期37卷 255-265页

作者： X.Y.Yue S.Y.Peng X.Zhang C.N.He Y.Z.Tian Key Laboratory for Anisotropy and Texture of Materials(Ministry of Education) School of Materials Science and EngineeringNortheastern UniversityShenyang110819China School of Materials Science and Engineering and Tianjin Key Laboratory of Composite and Functional Materials Tianjin UniversityTianjin300350China Research Centre for Metallic Wires Northeastern UniversityShenyang110819China

A Cu-10wt%Fe composite was prepared through hot-pressed sintering,and the material was subsequently solution *** hot-pressed sintered and solution treated materials were rolled and *** precipitation behavior and performance changes were systematically studied by using scanning electron microscopy and transmission electron *** contrast to the hot-pressed sintered specimen,the solution treatment significantly affects the thermal stability and properties of the Cu-10wt%Fe *** Cu-10wt%Fe composite was prepared after solid solution,cold rolling and aging at 773 K for 1 h,and it obtained excellent tensile strength of 494 MPa,uniform elongation of 16.3%,electrical conductivity of 51.1%IACS and softening temperature of 838 *** for the distinct difference in thermal stability and properties between hot-pressed sintered and solution treated specimens were *** findings provide a theoretical basis for designing high-performance Cu-based in-situ composites by post treatment.

关键词： Cu-Fe composite Hot-pressed sintering Thermal stability Strength Electrical conductivity

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Occupied Outer Cationic Orbitals in Dimeric MX_(2)-Type BaSe_(2) Compound Lead to Reduced Thermal Conductivity and High Thermoelectric Performance

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Energy & Environmental materials 2025年第1期8卷 203-214页

作者： Jie Zhang Li Zhou Xiaohong Xia Yun Gao Zhongbing Huang Ministry-of-Education Key Laboratory for the Green Preparation and Application of Functional Materials School of Materials Science and EngineeringHubei UniversityWuhan 430062China School of Physics Hubei UniversityWuhan 430062China

Decoupling electrical and thermal properties to enhance the figure of merit of thermoelectric materials underscores an in-depth understanding of the mechanisms that govern the transfer of charge ***,a factor that contributes to the optimization of thermal conductivity is often found to be detrimental to the electrical transport ***,we systematically investigated 26 dimeric MX_(2)-type compounds(where M represents a metal and X represents a nonmetal element)to explore the influence of the electronic configurations of metal cations on lattice thermal transport and thermoelectric performance using first-principles calculations.A principled scheme has been identified that the filled outer orbitals of the cation lead to a significantly lower lattice thermal conductivity compared to that of the partly occupied case for MX_(2),due to the much weakened bonds manifested by the shallow potential well,smaller interatomic force constants,and higher atomic displacement *** on these findings,we propose two ionic compounds,BaAs and BaSe_(2),to realize reasonable high electrical conductivities through the structural anisotropy caused by the inserted covalent X_(2) dimers while still maintaining the large lattice *** combined superior electrical and thermal properties of BaSe_(2) lead to a high n-type thermoelectric ZT value of 2.3 at 500 *** work clarifies the structural origin of the heat transport properties of dimeric MX_(2)-type compounds and provides an insightful strategy for developing promising thermoelectric materials.

关键词： anisotropic electrical and thermal transport density functional theory dimeric MX_(2)-type compounds energy materials ionic compound BaSe_(2)and BaAs simulation thermoelectrics

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