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Thermal control magnetic switching dominated by spin reorientation transition in Mn-doped PrFeO_(3) single crystals

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Frontiers of physics 2022年第3期17卷 35-41页

作者： Wencheng Fan Haiyang Chen Gang Zhao Xiaoxuan Ma Ramki Chakaravarthy Baojuan Kang Wenlai Lu Wei Ren Jincang Zhang Shixun Cao materials Genome Institute Department of Physics and International Center for Quantum and Molecular StructuresShanghai UniversityShanghai 200444China Shanghai Key Laboratory of high temperature Superconductors Shanghai UniversityShanghai 200444China

Spin reorientation transition (SRT) has attracted substantial attention due to its important role in the ultrafast control of spins. However, the transition temperature is usually too low for its practical applications. Here, we demonstrate the ability to modulate the SRT temperature in PrFe_(1−x)Mn_(x)O_(3) single crystals from 196 K to 317 K across the room temperature by varying the Mn concentration. Interestingly, the Γ_(4) to Γ_(1) spin reorientation of the Mn-doped PrFeO_(3) is distinct from the Γ_(4) to Γ_(2) spin reorientation transition as in the parent material. Because of the coupling between rare-earth ions and transition-metal ions in determining the SRT temperature, the demonstrated control scheme of spin reorientation transition temperature by Mn-doping is expected to be used in temperature control magnetic switching devices and applicable to many other rare-earth orthoferrites.

关键词： magnetic switching spin reorientation transition perovskite oxides

Hierarchical FeO_(χ)H_(y)@Ni_(3)B hybrid for efficient alkaline oxygen evolution at high current density

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Journal of energy Chemistry 2024年第7期94卷 599-607页

作者： Fuxi Liu Qing Liang Zhenyu Li Meiqi Liu Nailin Yue Zizhun Wang Xu Zou Wei Zhang Key Laboratory of Automobile materials Ministry of Education School of Materials Science&EngineeringElectron Microscopy CenterInternational Center of Future ScienceJilin Provincial International Cooperation Key Laboratory of High-Efficiency Clean Energy MaterialsJilin UniversityChangchun 130012JilinChina

Electrocatalysts with high activity and long-term durability are vital toward large-scale hydrogen pro-duction from electrocatalytic water ***,the self-supported electrode(FeO_(χ)H_(y)@Ni_(3)B/NF)with hierarchical heterostructure was simply prepared by using Ni_(3)B chunks grown on nickel foam as sub-strate to in situ form vertical FeO_(χ)H_(y)*** hybrid shows efficient oxygen evolution reaction activity with overpotentials as low as 267 and 249 mV at 100 mA cm^(-2)in 1 M KOH solution and 30 wt%KOH solution,***,it also exhibits excellent catalytic stability,sustaining catalysis at 500 mA cm^(-2)in 1 M KOH solution for 200 h,and even for 200 h at 1000 mA cm^(-2)in 30 wt%KOH *** experimental results reveal that the FeO_(χ)H_(y)@Ni_(3)B/NF is endowed with superhydrophilic and superaerophobic surface properties,which not only provide more mass transport channels,as well as facilitated the diffusion of reaction intermediates and gas ***,it holds faster reaction kinetics,more accessible active sites and accelerated electron transfer rates due to strong synergistic interactions attheheterogeneous interface.

关键词： FeO_(χ)H_(y)@Ni_(3)B/NF hybrid Heterostructure Oxygen evolution reaction Electrocatalytic

Quantum Dots Compete at the Acme of MXene Family for the Optimal Catalysis

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Nano-Micro Letters 2022年第10期14卷 36-82页

作者： Yuhua Liu Wei Zhang Weitao Zheng Key Laboratory of Automobile materials MOE and School of Materials Science and Engineeringand Jilin Provincial International Cooperation Key Laboratory of High-Efficiency Clean Energy Materialsand Electron Microscopy Centerand International Center of Future ScienceJilin UniversityChangchun 130012People’s Republic of China

It is well known that two-dimensional(2D)MXene-derived quan-tum dots(MQDs)inherit the excellent physicochemical properties of the parental MXenes,as a Chinese proverb says,“Indigo blue is extracted from the indigo plant,but is bluer than the plant it comes from.”Therefore,0D QDs harvest larger surface-to-volume ratio,outstanding optical properties,and vigorous quantum confinement ***,MQDs trigger enormous research enthusiasm as an emerging star of functional materials applied to physics,chemistry,biology,energy conversion,and *** the surface properties of small-sized MQDs include the type of surface functional groups,the functionalized surface directly determines their *** the Nobel Laureate Wolfgang Pauli says,“God made the bulk,but the surface was invented by the devil,”and it is just on the basis of the abundant surface functional groups,there is lots of space to be thereof excavated from *** are witnessing such excellence and even more promising to be ***,MQDs have been widely applied to catalysis,whereas the related reviews are rarely ***,we provide a state-of-the-art overview of MQDs in catalysis over the past five years,ranging from the origin and development of MQDs,synthetic routes of MQDs,and functionalized MQDs to advanced characterization *** explore the diversity of catalytic application and perspectives of MQDs,our review will stimulate more efforts toward the synthesis of optimal MQDs and thereof designing high-performance MQDs-based catalysts.

关键词： MXene Quantum dots Catalysis Surface groups Structure

Investigation on the Pinch Point Position in Heat Exchangers

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Journal of Thermal Science 2016年第3期25卷 258-265页

作者： PAN Lisheng SHI Weixiu State Key Laboratory of high-temperature Gas Dynamics Institute of MechanicsChinese Academy of Sciences School of Environment and energy Engineering Beijing University of Civil Engineering and Architecture

The pinch point is important for analyzing heat transfer in thermodynamic cycles. With the aim to reveal the importance of determining the accurate pinch point, the research on the pinch point position is carried out by theoretical method. The results show that the pinch point position depends on the parameters of the heat transfer fluids and the major fluid properties. In most cases, the pinch point locates at the bubble point for the evaporator and the dew point for the condenser. However, the pinch point shills to the supercooled liquid state in the near critical conditions for the evaporator. Similarly, it shifts to the superheated vapor state with the condensing temperature approaching the critical temperature for the condenser. It even can shift to the working fluid entrance of the evaporator or the supereritical heater when the heat source fluid temperature is very high compared with the absorb- ing heat temperature. A wrong position for the pinch point may generate serious mistake. In brief, the pinch point should be founded by the itcrativc method in all conditions rather than taking for granted.

关键词： pinch point position heat exchanger heat transfer phase transition supercritical condition

Ant-nest-inspired porous structure for MXene composites with high-performance energy-storage and actuating multifunctions

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Nano Research 2024年第7期17卷 6673-6685页

作者： Yi Wang Guanfeng Xue Zhiling Luo Wei Zhang Luzhuo Chen Fujian Provincial Key Laboratory of Quantum Manipulation and New energy materials College of Physics and EnergyFujian Normal UniversityFuzhou 350117China Fujian Provincial Collaborative Innovation center for Advanced high-Field Superconducting materials and Engineering Fuzhou 350117China

Integrating energy-storage devices(supercapacitors)and shape-deformation devices(actuators)advances the miniaturization and multifunctional development of soft ***,soft robots necessitate supercapacitors with high energy-storage performance and actuators with excellent actuation ***,inspired by ant nests,we present a porous structure fabricated by MXene-graphene-methylcellulose(M-GMC)composite,which overcomes the self-stacking of MXene nanosheets and offers a larger specific surface *** porous structure provides more channels and active sites for electrolyte ions,resulting in high energy storage *** areal capacitance of the M-GMC electrode reaches up to 787.9 mF·cm^(−2),significantly superior to that of the pristine MXene electrode(449.1 mF·cm^(−2)).Moreover,the M-GMC/polyethylene bilayer composites with energy storage and multi-responsive actuation functions are *** M-GMC is used as the electrode and the polyethylene is used as the encapsulation layer of the quasi-solid-state ***,the actuators fabricated by the bilayer composites can be driven by light or low voltage(≤9 V).The maximum bending curvature is up to 5.11 cm^(−1).Finally,a smart gripper and a fully encapsulated smart integrated circuit based on the M-GMC/polyethylene are *** smart gripper enables programmable control with multi-stage *** applications realize the intelligence and miniaturization of soft *** ant-nest-inspired M-GMC composites would provide a promising development strategy for soft robots and smart integrated devices.

关键词： MXene graphene ant nest supercapacitor actuator multi-functional

Recent advances of vanadium-based cathode materials for zinc-ion batteries

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Chinese Chemical Letters 2021年第12期32卷 3753-3761页

作者： Xuerong Li Haoyan Cheng Hao Hu Kunming Pan Tongtong Yuan Wanting Xia School of materials Science and Engineering Henan University of Science and TechnologyLuoyang 471023China Henan Key Laboratory of high-temperature Structural and Functional materials National Joint Engineering Research Center for Abrasion Control and Molding of Metal MaterialsHenan University of Science and TechnologyLuoyang 471003China

Zn-ion batteries(ZIBs) have gained great attention as promising next-generation power sources, because of their low cost, enviable safety and high theoretical capacity. Recently, massive researches have been devoted to vanadium-based materials as cathodes in ZIBs, owing to their multiple valence states, competitive gravimetric energy density, but the capacity degradation, sluggish kinetics, low operating voltage hinder further optimization of their performance in ZIBs. This review summarizes recent progress to increase the interlayer spacing, structural stability, and the diffusion ability of the guest Zn ions, including the insertion of different ions, introduction of defects, design of diverse morphologies, the combination of other materials. We also focus on approaches to promoting the valuable performance of vanadiumbased cathodes, along with the related ongoing scientific challenges and limitations. Finally, the future perspectives and research directions of vanadium-based aqueous ZIBs are provided.

关键词： Aqueous zinc-ion batteries Vanadium-based materials Cathodes energy storage Design strategy

Macro-microscopic morphology and phase analysis of TiAl-based alloys sheet fabricated by EB-PVD method

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中国有色金属学会会刊：英文版 2007年第4期17卷 777-782页

作者：章德铭陈贵清韩杰才张幸红姚振中 center for Composite materials Harbin Institute of Technology National Key Laboratory for high energy Density Beam Processing Technology Beijing Aeronautical Manufacturing Technology Research Institute

TiAl-based alloys sheet with thickness of 0.3-0.4 mm as well as dimension of 150 mm×100 mm was fabricated successfully by using electron beam-physical vapor deposition(EB-PVD) method. The microscopic morphology and phase composition of specimens in various states were analyzed by atomic force microscope(AFM), scanning electron microscope(SEM) and X-ray diffractometer(XRD), respectively. The results indicate that the as-deposited TiAl-based alloys sheet has good surface quality and is composed of γ, α2 and τ phase. There is natural delamination inside the sheet, of which the microstructure is columnar crystal, and the component shows a gradient change along the normal direction of substrate. After the vacuum hot pressing treatment and subsequent homogenization treatment, the columnar crystal transforms into the coarse fully lamellar microstructure, the delamination phenomenon and τ phase disappear, α2 phase decreases obviously, and the composition tends to uniformization.

关键词：钛铝合金电子束-物理气相沉积微观结构相分析

Photo-thermoelectric generator integrated in graphene-based actuator for self-powered sensing function

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Nano Research 2022年第6期15卷 5376-5383页

作者： Peidi Zhou Jian Lin Wei Zhang Zhiling Luo Luzhuo Chen Fujian Provincial Key Laboratory of Quantum Manipulation and New energy materials College of Physics and EnergyFujian Normal UniversityFuzhou 350117China Fujian Provincial Collaborative Innovation center for Advanced high-Field Superconducting materials and Engineering Fuzhou 350117China Fujian Provincial Engineering Technology Research center of Solar energy Conversion and energy Storage Fuzhou 350117China

Smart actuators integrated with sensing functions are taking a significant role in constructing intelligent ***,the detection of sensing signals in most actuators requires external electrical power,lacking in the self-powered ***,we report a graphene-based light-driven actuator with self-powered sensing function,which is designed by integrating a photothermoelectric generator into the actuator *** one part of the actuator is irradiated by near-infrared light,it shows a deformation with bending curvature up to 1.5 cm^(−1),owing to the mismatch volume changes between two layers of the ***,the temperature difference across the actuator generates a voltage signal due to the photo-thermoelectric *** Seebeck coefficient is higher than 40μV/***,the self-powered voltage signal is consistent with the deformation trend,which can be used to characterize the deformation state of actuator without external electrical *** further demonstrate a gripper and a bionic *** deformations mimic the motions of human hand(or finger),even making complex ***,they can output self-powered voltage signals for *** hope this research will pave a new way for selfpowered devices,state-of-the-art intelligent robots,and other integrated multi-functional systems.

关键词： photo-thermoelectric effect generator light-driven actuator self-powered graphene

Plant-leaf-inspired MXene-silk composite for intelligent solar steam generation combined with mechanical actuation

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Nano Research 2023年第5期16卷 7792-7800页

作者： Yongqiang Qian Zhiling Luo Yi Wang Wei Zhang Luzhuo Chen Fujian Provincial Key Laboratory of Quantum Manipulation and New energy materials College of Physics and EnergyFujian Normal UniversityFuzhou 350117China Fujian Provincial Collaborative Innovation center for Advanced high-Field Superconducting materials and Engineering Fuzhou 350117China Fujian Provincial Engineering Technology Research center of Solar energy Conversion and energy Storage Fuzhou 350117China

Solar steam generators based on photothermal materials are important in producing fresh ***,conventional solar steam generators are difficult to self-adapt to the complex external environment as ***,inspired by the plant leaf,we propose a photothermal composite based on MXene and silk to add more *** one hand,the composite achieves an evaporation rate of 1.51 kg·m^(−2)·h^(−1)and a conversion efficiency of 86.9%under a solar intensity of 1 kW·m^(−2),mimicking the water transpiration of plant *** the other hand,the MXene-silk-based actuator shows a maximum bending curvature of 0.91 cm^(−1)under a solar intensity of 5 kW·m^(−2).Furthermore,an intelligent solar system is constructed utilizing the synergy of solar steam generator and actuator,which advances the research from the material level to the system *** the behavior of plant leaf,the system can automatically open during the day to generate steam and fresh *** at night or in bad weather,it will automatically close to prevent external pollution such as dust,achieving intelligent *** research will have good application prospects in less developed ***,it also provides a certain reference value for exploring multi-functional photothermal devices in the future.

关键词： MXene silk solar steam generator photothermal actuator multi-functional