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Two-step growth of high-quality single crystals of the Kitaev magnet α−RuCl 3

Physical Review materials 2024年第7期8卷 074404-074404页

作者： R. Namba K. Imamura R. Ishioka K. Ishihara T. Miyamoto H. Okamoto Y. Shimizu Y. Saito Y. Agarmani M. Lang H. Murayama Y. Xing S. Suetsugu Y. Kasahara Y. Matsuda K. Hashimoto T. Shibauchi Department of Advanced Materials Science Department of Physics Institute of Physics Center for Emergent Matter Science (CEMS) Wako 351-0198 Japan State Key Laboratory of Heavy Oil Processing College of New Energy and Materials

The layered honeycomb magnet α−RuCl3 is the most promising candidate for a Kitaev quantum spin liquid (KQSL) that can host charge-neutral Majorana fermions. Recent studies have shown significant sample dependence of thermal transport properties, which are a key probe of Majorana quasiparticles in the KQSL state, highlighting the importance of preparing high-quality single crystals of α−RuCl3. Here, we present a relatively simple and reliable method to grow high-quality single crystals of α−RuCl3. We use a two-step crystal growth method consisting of a purification process by chemical vapor transport (CVT) and a main crystal growth process by sublimation. The obtained crystals exhibit a distinct first-order structural phase transition from the monoclinic (C2/m) to the rhombohedral (R3¯) structure at ∼150 K, which is confirmed by the nuclear quadrupole resonance spectra with much sharper widths than previously reported. The Raman spectra show the absence of defect-induced modes, supporting the good crystallinity of our samples. The jumps in the thermal expansion coefficient and specific heat at the antiferromagnetic (AFM) transition at 7.6–7.7 K are larger and sharper than those of previous samples grown by the CVT and Bridgman methods and do not show any additional AFM transitions at 10–14 K due to stacking faults. The longitudinal thermal conductivity in the AFM phase is significantly larger than previously reported, indicating a very long mean-free path of heat carriers. All the results indicate that our single crystals are of superior quality with good crystallinity and few stacking faults, which provides a suitable platform for studying the Kitaev physics.

关键词： Frustrated magnetism Magnetic susceptibility Quantum spin liquid Specific heat Thermal conductivity Thermal expansion Honeycomb lattice Kitaev model Nuclear quadrupole resonance Raman spectroscopy X-ray diffraction

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Biphasic mineralized collagen-based composite scaffold for cranial bone regeneration in developing sheep

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Regenerative Biomaterials 2022年第1期9卷 280-293页

作者： Jingchuan Zheng Zhijun Zhao Yongdong Yang Shuo Wang Yonggang Zhao Yang Xiong Shuhui Yang Zhiye Qiu Tianxi Song Chunyang Zhang Xiumei Wang State Key Laboratory of New Ceramics and Fine Processing Key Laboratory of Advanced Materials of Ministry of EducationSchool of Materials Science and EngineeringTsinghua UniversityBeijing 100084China Department of Neurosurgery The First Affiliated Hospital of Baotou Medical SchoolBaotou 014010China Dongzhimen Hospital Affiliated Beijing University of Chinese Medicine Beijing 100700China Beijing Allgens Medical Science and Technology Co. Ltd.Beijing 100176China

Appropriate mechanical support and excellent osteogenic capability are two essential prerequisites of customized implants for regenerating large-sized cranial bone *** porous bone scaffolds have been widely proven to promote bone regeneration,their weak mechanical properties limit the clinical applications in ***,we applied two previously developed mineralized collagen-based bone scaffolds(MC),porous MC(pMC)and compact MC(cMC)to construct a biphasic MC composite bone scaffold(bMC)to repair the large-sized cranial bone defect in developing sheep.A supporting frame composed of cMC phase in the shape of tic–tac–toe structure was fabricated first and then embedded in pMC *** two phases had good interfacial bond,attributing to the formation of an interfacial *** in vivo performance of the bMC scaffold was evaluated by using a cranial bone defect model in 1-month-old *** computed tomography imaging,X-ray scanning and histological evaluation showed that the pMC phase in the bMC scaffold,similar to the pMC scaffold,was gradually replaced by the regenerative bone tissues with comprehensively increased bone mineral density and complete connection of bone bridge in the whole *** cMC frame promoted new bone formation beneath the frame without obvious degradation,thus providing appropriate mechanical protection and ensuring the structural integrity of the *** general,the sheep with bMC implantation exhibited the best status of survival,growth and the repair *** biphasic structural design may be a prospective strategy for developing new generation of cranioplasty materials to regenerate cranial bone defect in clinic.

关键词： mineralized collagen cranial bone defect biphasic composite scaffold,developing sheep

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Single‐atomic Co‐B_(2)N_(2)sites anchored on carbon nanotube arrays promote lithium polysulfide conversion in lithium-sulfur batteries

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Carbon Energy 2023年第11期5卷 31-43页

作者： Zhifeng Wang Yajing Yan Yongguang Zhang Yanxu Chen Xianyun Peng Xin Wang Weimin Zhao Chunling Qin Qian Liu Xijun Liu Zhongwei Chen Key Laboratory for New Type of Functional Materials in Hebei Province School of Materials Science and EngineeringHebei University of TechnologyTianjinChina Tianjin Key Lab for Photoelectric Materials&Devices Institute for New Energy Materials&Low‐Carbon TechnologiesSchool of Materials Science and EngineeringTianjin University of TechnologyTianjinChina South China Academy of Advanced Optoelectronics International Academy of Optoelectronics at ZhaoqingSouth China Normal UniversityGuangdongChina Institute for Advanced Study Chengdu UniversityChengduSichuanChina MOE Key Laboratory of New Processing Technology for Non‐Ferrous Metals and Materials Guangxi Key Laboratory of Processing for Non‐Ferrous Metals and Featured MaterialsSchool of ResourceEnvironments and MaterialsGuangxi UniversityNanningChina Department of Chemical Engineering University of WaterlooWaterlooOntarioCanada

Due to low cost,high capacity,and high energy density,lithium–sulfur(Li–S)batteries have attracted much attention;however,their cycling performance was largely limited by the poor redox kinetics and low sulfur ***,predicted by density functional theory calculations,single‐atomic Co‐B2N2 site‐imbedded boron and nitrogen co‐doped carbon nanotubes(SA‐Co/BNC)were designed to accomplish high sulfur loading,fast kinetic,and long service period Li–S *** proved that Co‐B2N2 atomic sites can effectively catalyze lithium polysulfide ***,the electrodes delivered a specific capacity of 1106 mAh g−1 at 0.2 C after 100 cycles and exhibited an outstanding cycle performance over 1000 cycles at 1 C with a decay rate of 0.032%per *** study offers a new strategy to couple the combined effect of nanocarriers and single‐atomic catalysts in novel coordination environments for high‐performance Li–S batteries.

关键词： carbon nanotubes coordination environment engineering density functional theory calculation lithium-sulfur batteries single‐atom catalys

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Gallium-based liquid metals for lithium-ion batteries

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Interdisciplinary materials 2022年第3期1卷 354-372页

作者： Bin-Wei Zhang Long Ren Yun-Xiao Wang Xun Xu Yi Du Shi-Xue Dou College of Chemistry and Chemical Engineering Chongqing UniversityChongqingChina Center of Advanced Energy Technology and Electrochemistry Chongqing UniversityChongqingChina Institute for Superconducting and Electronic Materials Australian Institute of Innovative MaterialsUniversity of WollongongNorth WollongongNew South WalesAustralia State Key Laboratory of Advanced Technology for Materials Synthesis and Processing International School of Materials Science and EngineeringWuhan University of TechnologyWuhanChina BUAA-UOW Joint Research Centre and School of Physics Beihang UniversityBeijingChina

Lithium-ion batteries(LIBs)are one of the most exciting inventions of the 20th century and have been widely employed in modern *** have powered many of our electronics,such as laptop computers,smartphones,and even large-scale energy storage *** the development of modern technology,next-generation LIBs with higher energy density are in demand.A number of electrode materials with high theoretical capacity,including Sn,Si,Li metal anode,and S cathode materials,have been ***,they usually suffer from structural or interface failure during cycling,limiting their practical ***-based liquid metals(LMs)possess self-healing capability,fluidity,and metallic advantages so they have been employed as self-healing skeletons or interfacial protective layers to minimize the negative impact of volume expansion or dendritic growth on the electrode ***,the features of Ga-based LMs are briefly discussed to indicate their potential for battery *** addition,recent developments on Ga-based LMs applied in LIBs have been summarized,including from the aspects of anodes,cathodes,and ***,future opportunities and challenges for the development of Ga-based LMs in LIBs are highlighted.

关键词： anode cathode electrolyte gallium-based liquid metals lithium-ion batteries

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Microstructure Evolution and Mechanical Properties of Ti-25Ta Alloy Fabricated by Selective Laser Melting and Hot Isostatic Pressing

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稀有金属材料与工程 2024年第8期53卷 2123-2130页

作者： Pu Yunna Zhao Dewei Liu Binbin Shi Qi Li Junlei Tan Chong Shen Zhengyan Xie Huanwen Liu Xin Guangdong Provincial Key Laboratory of Metal Toughening Technology and Application National Engineering Research Center of Powder Metallurgy of Titanium&Rare MetalsInstitute of New MaterialsGuangdong Academy of SciencesGuangzhou 510650China Affiliated Zhongshan Hospital of Dalian University Dalian 116001China State Key Laboratory for Advanced Metals and Materials University of Science and Technology BeijingBeijing 100083China

Ti-25Ta alloy samples were fabricated by selective laser melting,and the relative density,microstructure,microhardness and tensile properties of the as-built and hot isostatic pressing(HIP)-prepared samples were *** show that the track width and penetration depth are increased with the increase in laser power,and the surface morphology is *** maximum relative density improves from 95.31%to 98.01%after HIP ***,the microstructure is refined into the lath martensite and cellular grains with the increase in input *** densification treatment,the subgrain coalescence occurs and high angle grain boundaries are *** addition,HIP process stabilizes the microhardness and enhances the tensile strength and elongation.

关键词： Ti-25Ta alloy selective laser melting hot isostatic pressing

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Recent advances in microenvironment regulation for electrocatalysis

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National Science Review 2024年第12期11卷 38-58页

作者： Zhiyuan Xu Xin Tan Chang Chen Xingdong Wang Rui Sui Zhongbin Zhuang Chao Zhang Chen Chen Engineering Research Center of Advanced Rare Earth Materials Department of Chemistry Tsinghua University Research Institute of Petroleum Processing SINOPEC State Key Lab of Organic-Inorganic Composites Beijing University of Chemical Technology MOE International Joint Laboratory of Materials Microstructure Institute for New Energy Materials and Low-Carbon Technologies School of Materials Science and EngineeringTianjin University of Technology

High-efficiency electrocatalysis could serve as the bridge that connects renewable energy technologies,hydrogen economy and carbon capture/utilization, promising a sustainable future for humankind. It is therefore of paramount significance to explore feasible strategies to modulate the relevant electrocatalytic reactions and optimize device performances so as to promote their large-scale practical *** regulation at the catalytic interface has been demonstrated to be capable of effectively enhancing the reaction rates and improving the selectivities for specific products. In this review we summarize the latest advances in microenvironment regulation in typical electrocatalytic processes(including water electrolysis, hydrogen–oxygen fuel cells, and carbon dioxide reduction) and the related in situ/operando characterization techniques and theoretical simulation methods. At the end of this article, we present an outlook on development trends and possible future directions.

关键词： microenvironment regulation electrical double layer hydrogen electrocatalysis oxygen electrocatalysis CO reduction reaction

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Toward ultra-high strength high entropy alloys via feature engineering

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Journal of materials Science & technology 2024年第33期200卷 243-252页

作者： Yan Zhang Cheng Wen Pengfei Dang Turab Lookman Dezhen Xue Yanjing Su Beijing Advanced Innovation Center for Materials Genome Engineering University of Science and Technology BeijingBeijing100083China Corrosion and Protection Center University of Science and Technology BeijingBeijing100083China Northwest Institute for Non-ferrous Metal Research Xi’an710016China College of Mechanical Engineering Guangdong Ocean UniversityZhanjiang524000China State Key Laboratory for Mechanical Behavior of Materials Xi’an Jiaotong UniversityXi’an710049China AiMaterials Research LLC Santa FeNew Mexico87501United States

Machine learning assisted design of materials is so far based on features selected by considering the accuracy of model predictions,and those features do not necessarily ensure a high efficiency in searching for new *** we estimate the efficiency of active learning loop by resampling method using available data as an alternative criterion for *** selected features allow an optimization of targeted property with as few new experiments as *** those features into machine learning,we synthesized new high entropy alloys(HEAs)with strengths 2.8–3.0 GPa within five experimental *** alloy AlVCrCoNiMo is found to possess compressive specific yield strengths of 397,144 and 105(MPa cm^(3))/g at 25,800 and 900℃,*** specific yield strength of AlVCrCoNiMo alloy at 800℃is about twice that of the commercial Inconel 718 and the typical refractory HEA of VNbMoTaW.A unique microstructure consisting of multi-scale hierarchical B2 precipitates with coherent interfaces to the BCC matrix strengthens the *** strategy of maximizing active learning efficiency provides a recipe for selecting features that accelerate the optimization of targeted property.

关键词： Machine learning Feature selection High entropy alloys Active learning Precipitation

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Flexible three-dimensional-networked iron vanadate nanosheet arrays/carbon cloths as high-performance cathodes for magnesium ion batteries

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Science China materials 2022年第8期65卷 2197-2206页

作者： Han Tang Chunli Zuo Fangyu Xiong Cunyuan Pei Shuangshuang Tan Ping Luo Wei Yang Qinyou An Liqiang Mai State Key Laboratory of Advanced Technology for Materials Synthesis and Processing International School of Materials Science and EngineeringWuhan University of TechnologyWuhan 430070China Hubei Provincial Key Laboratory of Green Materials for Light Industry Collaborative Innovation Center of Green Light-Weight Materials and ProcessingSchool of Materials and Chemical EngineeringHubei University of TechnologyWuhan 430070China Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory Foshan 528200China

Owing to their safety and low cost,magnesium ion batteries(MIBs)have attracted much attention in recent ***,the sluggish diffusion dynamics of magnesium ions hampers the search for appropriate cathode materials with excellent electrochemical ***,we design and synthesize a novel flexible three-dimensional-networked composite of iron vanadate nanosheet arrays/carbon cloths(3 D FeVO/CC)as a binder-free cathode for *** to bare FeVO nanosheets,the 3 D binder-free electrode with designed architecture enables a full range of electrochemical potential,including a high specific capacity of270 mA h g^(-1) and an increased life span(over 5000 cycles).Such achievable high-density energy originates from the synergistic optimization of electron and ion kinetics,while the durability benefits from the robust structure that prevents degradation in *** single-phase reaction mechanism of FeVO in the magnesium ion storage process is also explored by in-situ X-ray diffraction and Raman ***,a flexible MIB pouch cell(3 D FeVO/CCIMgNaTi_(3)O_(7)) is assembled and exhibits practical application *** work verifies that 3 D FeVO/CC is a potential candidate cathode material that can satisfy the requirements of highperformance *** also opens a new avenue to improve the electrochemical performance of cathode materials for MIBs.

关键词： iron vanadate nanosheet arrays flexibility cathode materials magnesium ion batteries

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Activating interfacial S sites of MoS_(2) boosts hydrogen evolution electrocatalysis

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Nano Research 2022年第3期15卷 1809-1816页

作者： Shuo Geng Fenyang Tian Menggang Li Yequn Liu Jie Sheng Weiwei Yang Yongsheng Yu Yanglong Hou Laboratory for Space Environment and Physical Science Research Center of Basic Space ScienceHarbin Institute of TechnologyHarbin 150001China MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage School of Chemistry and Chemical EngineeringHarbin Institute of TechnologyHarbin 150001China Analytical Instrumentation Center State Key Laboratory of Coal ConversionInstitute of Coal ChemistryChinese Academy of SciencesTaiyuan 030001China Beijing Key Laboratory for Magnetoelectric Materials and Devices(BKL-MMD) Beijing Innovation Center for Engineering Science and Advanced Technology(BIC-ESAT)School of Materials Science and EngineeringPeking UniversityBeijing 100871China

The hydrogen evolution reaction(HER)of molybdenum disulfide(MoS_(2))is limited in alkaline and acid solution because the active sites are on the finite edge with extended basal plane remaining ***,we activated the interfacial S sites by coupling with Ru nanoparticles on the inert basal plane of MoS_(2)*** density functional theory(DFT)calculation and experimental results show that the interfacial S electronic structure was *** the results of∆G H*demonstrate that the adsorption of H on the MoS_(2)was also *** the advantage of interfacial S sites activation,the Ru-MoS_(2)needs only overpotential of 110 and 98 mV to achieve 10 mA·cm^(–2)in both 0.5 M H_(2)SO_(4)and ^(1) M KOH solution,*** strategy paves a new way for activating the basal plane of other transition metal sulfide electrocatalysts for improving the HER performance.

关键词： electronic structure interfacial S sites d-band center hydrogen evolution reaction

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Porous Cellulose Acetate/Tio2 Nanofluids Fibrous Membrane for High Sweat Evaporation Ability, Passive Daytime Radiative Cooling and Energy Harvesting

SSRN

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SSRN 2023年

作者： Xu, Mei Fu, Xinming Chen, Zhicheng Zheng, Long Song, Yiheng Wang, Jinfeng Wen, Xianjie Yin, Xianze College of Materials Science and Engineering National Local Joint Laboratory for Advanced Textile Processing and Clean Production Wuhan Textile University Wuhan430200 China Department of Anesthesiology The Second People’s Hospital of Foshan City Guangdong Province Foshan528000 China State Key Laboratory of New Textile Materials & Advanced Processing Technology Wuhan Textile University 430200 China Wuhan Textile University China

Radiant refrigeration textiles with passive personal thermal management have become a convenient, economical and energy-saving method for outdoor human thermal comfort. Existing passive radiative cooling textiles are primarily manufactured from synthetic polymers and often lack moisture management functionality. In this paper, titanium dioxide was prepared into solvent-free fluid and then wrapped into cellulose acetate membrane by electrospinning. This fabric integrates passive radiative cooling and sweat evaporation functions using an extensible electrospinning technique. Due to effective scattering, CA's molecular vibration and the solvent-free nanofluids’ phonon-polariton resonance, this CA/TiO2 nanofluids (nfs) membrane shows a high solar reflectance of 0.92 and a high emittance of 0.85, which demonstrates significant radiative cooling performance under clear sky conditions. It can be utilized not only for cooling buildings and vehicles but also provides additional capabilities for absorbing sweat and facilitating evaporation due to its hydrophilicity. The nanofiber textile reduces the temperature of the covered area by 8 °C when exposed to direct sunlight outside. In addition, this membrane also exhibits excellent triboelectric properties (power density 77 mW/m2), making it promising for use in the field of energy harvesting. Combined with many advantages such as biodegradability, high radiation refrigeration, efficient perspiration and triboelectric properties, these CA/TiO2 nfs composite membranes will be effective textiles for passive personal thermal management. © 2023, The Authors. All rights reserved.

关键词： Energy harvesting

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