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Eutectic-derived high-entropy nanoporous nanowires for efficient and stable water-to-hydrogen conversion

Nano Research 2022年第6期15卷 4820-4826页

作者： Ying Wang Bin Yu Ming He Zhihua Zhai Kuibo Yin Fangong Kong Zhonghua Zhang State Key Laboratory of Biobased Material and Green Papermaking Qilu University of Technology(Shandong Academy of Sciences)Jinan 250353China Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials(Ministry of Education) School of Materials Science and EngineeringShandong UniversityJinan 250061China SEU-FEI Nano-Pico Center Key Lab of MEMS of Ministry of EducationSoutheast UniversityNanjing 210096China

Combining multiple metal elements into one nanostructure merits untold application potential but is still a challenge for the traditional bottom-up synthesis ***,we propose a eutectic-directed self-templating strategy to prepare two multicomponent nanostructured alloys(PtPdRhIrNi(D-SN)and NiPtPdRhIrAl(D-SS))through the combination of rapid solidification with *** PtPdRhIrNi nanoporous nanowires(NPNWs)represent a new family of high-entropy alloys(HEAs)containing delicate hierarchical nanostructure with ultrafine ligament sizes of~2 nm in addition to one-dimensional(1D)***,the PtPdRhIrNi NPNWs display excellent electrocatalytic activity and stability toward hydrogen evolution reaction,with the low overpotential of 22 and 55 mV to afford a current density of 10 mA·cm^(−2)in 0.5 M H_(2)SO_(4)and 1.0 M KOH electrolytes,*** enhanced electrocatalytic performance can be attributed to the high-entropy effect favoring the surface electronic structure for the optimized activity,the promotion impact of Ni,1D morphology facilitating the electron transport,and the nanoporous structure promoting the electrolyte diffusion.

关键词： high-entropy alloy nanoporous nanowires dealloying electrocatalyst hydrogen evolution reaction

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Ferroelectricity of pristine Hf_(0.5)Zr_(0.5)O_(2) films fabricated by atomic layer deposition

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Chinese Physics B 2023年第10期32卷 684-688页

作者：陈璐秋张晓旭冯光迪刘逸飞郝胜兰朱秋香冯晓钰屈可杨振中祁原深 Yachin Ivry Brahim Dkhil 田博博褚君浩段纯刚 Key Laboratory of Polar Materials and Devices(MOE) Ministry of EducationShanghai Center of Brain-inspired Intelligent Materials and DevicesDepartment of ElectronicsEast China Normal UniversityShanghai 200241China Zhejiang Laboratory Hangzhou 310000China Guangdong Provisional Key Laboratory of Functional Oxide Materials and Devices Southern University of Science and TechnologyShenzhen 518055China Department of Materials Sciences and Engineering Guangdong Technion-Israel Institute of TechnologyShantou 515063China Department of Materials Science and Engineering Solid-State InstituteTechnion-Israel Institute of TechnologyHaifa 3200003Israel UniversitéParis-Saclay CentraleSupélecCNRS-UMR 8580Laboratoire StructuresPropriétés et Modélisation des SolidesGif-sur-Yvette 91190France State Key Laboratory of Infrared Physics Shanghai Institute of Technical PhysicsChinese Academy of SciencesShanghai 200083China Institute of Optoelectronics Fudan UniversityShanghai 200433China Collaborative Innovation Center of Extreme Optics Shanxi UniversityShanxi 030006China

Hafnium-based ferroelectric films,remaining their ferroelectricity down to nanoscale thickness,present a promising application for low-power logic devices and nonvolatile *** has been appealing for researchers to reduce the required temperature to obtain the ferroelectric phase in hafnium-based ferroelectric films for applications such as flexible and wearable *** work demonstrates that a remanent polarization(P_(r))value of>5μC/cm^(2)can be obtained in asdeposited Hf_(0.5)Zr_(0.5)O_(2)(HZO)films that are fabricated by thermal atomic layer deposition(TALD)under low temperature of 250℃.The ferroelectric orthorhombic phase(o-phase)in the as-deposited HZO films is detected by scanning transmission electron microscopy(STEM).This low fabrication temperature further extends the compatibility of ferroelectric HZO films to flexible electronics and avoids the cost imposed by following high-temperature annealing treatments.

关键词： Hf_(0.5)Zr_(0.5)O_(2)(HZO) ferroelectric orthorhombic without annealing

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Self-templated formation of twin-like metal-organic framework nanobricks as pre-catalysts for efficient water oxidation

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Nano Research 2022年第4期15卷 2887-2894页

作者： Fei-Xiang Ma Fucong Lyu Yingxue Diao BinBin Zhou Jianghua Wu Fengwen Kang Zebiao Li Xufen Xiao Peng Wang Jian Lu Yang Yang Li Centre for Advanced Structural Materials City University of Hong Kong Shenzhen Research InstituteGreater Bay Joint DivisionShenyang National Laboratory for Materials ScienceShenzhen 518057China Hong Kong Branch of National Precious Metals Material Engineering Research Center City University of Hong KongHong Kong 999077China Department of Mechanical Engineering City University of Hong KongGreater Bay Joint DivisionShenyang National Laboratory for Materials ScienceHong Kong 999077China Department of Material Science and Engineering City University of Hong KongHong Kong 999077China National Laboratory of Solid State Microstructures College of Engineering and Applied SciencesCollaborative Innovation Center of Advanced Microstructures and Center for the Microstructures of Quantum MaterialsNanjing UniversityNanjing 210093China CityU-Shenzhen Futian Research Institute No.3Binglang RoadFubao StreetFutian DistrictShenzhen 518045China

Fabrication of single-crystalline metal-organic framework(MOF)hollow nanostructures with two-dimensional(2D)morphologies is a challenging ***,twin-like MOF nanobricks,a quasi-hollow 2D architecture,with multi-metal nodes and replaceable organic ligands,are uniformly and firmly grown on conductive Ni foam through a generic one-pot *** formation process of twin-like MOF nanobricks mainly includes selective epitaxial growth of Fe-rich MOF layer and simultaneously dissolution of the pre-formed Ni-rich metal-organic frameworks(MOFs),all of which can be ascribed to a special self-templated *** fantastic structural merits of twin-like MOF nanobrick arrays,featuring highly exposed active sites,remarkable electrical conductivity,and hierarchical porosities,enable this material for efficient *** bimetallic NiFe-MOFs grown on Ni foam as an example,the resultant twin-like nanobrick arrays can be directly utilized as three-dimensional(3D)integrated electrode for high-performance water oxidation in 1 M KOH with a low overpotential,fast reaction kinetics(28.5 mV·dec^(-1)),and superb ***,the unstable NiFe-MOFs were served as an oxygen evolution reaction(OER)pre-catalyst and the single-crystalline NiFe-MOF precursor can be in-situ topochemically regulated into porous and lowcrystalline NiFeOx nanosheets during the OER *** work extends the hollowing strategy to fabricate hollow MOFs with 2D architectures and highlights their direct utilization for advanced electrocatalysis.

关键词： twin-like structures metal-organic frameworks oxygen evolution reaction self-templated pre-catalysts

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Progress and perspective of Li_(1+x)Al_(x)Ti_(2-x)(PO_(4))_(3) ceramic electrolyte in lithium batteries

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InfoMat 2021年第11期3卷 1195-1217页

作者： Ke Yang Likun Chen Jiabin Ma Yan-Bing He Feiyu Kang Shenzhen All-Solid-State Lithium Battery Electrolyte Engineering Research Center Tsinghua Shenzhen International Graduate SchoolInstitute of Materials Research(IMR)ShenzhenChina School of Materials Science and Engineering Tsinghua UniversityBeijingChina

The replacement of liquid organic electrolytes with solid-state electrolytes(SSEs)is a feasible way to solve the safety issues and improve the energy density of lithium *** SSEs materials that can well match with high-voltage cathodes and lithium metal anode is quite significant to develop high-energy-density lithium ***_(1+x)Al_(x)Ti_(2-x)(PO_(4))_(3)(LATP)SSE with NASICON structure exhibits high ionic conductivity,low cost and superior air stability,which enable it as one of the most hopeful candidates for all-solidstate batteries(ASSBs).However,the high interfacial impedance between LATP and electrodes,and the severe interfacial side reactions with the lithium metal greatly limit its applications in *** review introduces the crystal structure and ion transport mechanisms of LATP and summarizes the key factors affecting the ionic *** side reaction mechanisms of LATP with Li metal and the promising strategies for optimizing interfacial compatibility are *** also summarize the applications of LATP including as surface coatings of cathode particles,ion transport network additives and inorganic fillers of composite polymer *** last,this review proposes the challenges and the future development directions of LATP in SSBs.

关键词： crystal structure interfaces ionic conductivity Li_(1+x)Al_(x)Ti_(2-x)(PO_(4))_(3) lithium batteries

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Balancing the piezoelectric coefficient and carrier concentration of Bi_(2)WO_(6−x) for ultrahigh piezocatalysis

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Journal of Advanced Ceramics 2024年第11期13卷 1737-1747页

作者： Ying Wang Xiaoli Xu Lingbo Xiao Lutao Li Qiuhua Xu Zhenhai Wen Laishun Qin Yanmin Jia Dong-Liang Peng Wanping Chen Da Chen College of Materials and Chemistry China Jiliang UniversityHangzhou 310018China Key Laboratory of Jiangxi Province for Persistent Pollutants Control National-Local Joint Engineering Research Center of Heavy Metals Pollutants Control and Resource Utilization and Resources RecycleNanchang Hangkong UniversityNanchang 330063China Department of Physics Zhejiang University of Science and TechnologyHangzhou 310008China Jiangsu Key Laboratory for Science and Applications of Molecular Ferroelectrics Southeast UniversityNanjing 211189China Key Laboratory of Advanced Carbon Materials and Wearable Energy Technologies of Jiangsu Province College of EnergySoochow UniversitySuzhou 215006China State Key Laboratory of Structural Chemistry and Fujian Provincial Key Laboratory of Materials and Techniques toward Hydrogen EnergyFujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002China School of Physics and Information Technology Shaanxi Normal UniversityXi’an 710121China State Key Laboratory of Physical Chemistry of Solid Surface Fujian Key Laboratory of Surface and Interface Engineering for High Performance MaterialsCollege of MaterialsXiamen UniversityXiamen 361005China School of Physics and Technology Wuhan UniversityWuhan 430072China

Balancing the piezoelectric coefficient and carrier concentration of materials is key in the field of *** this work,Bi_(2)WO_(6) material with both piezoelectric and semiconductor properties was chosen as a model material.A one-step ethylene glycol(EG)-assisted solvothermal method was used to synthesize Bi2WO6 with oxygen *** controlling the solvothermal time and temperature,the oxygen vacancy concentration(COV)was *** COV increases,the piezoelectric coefficient decreases,the carrier concentration increases,and the hydrogen production rate first increases but then *** COV reaches 1.45×10^(12) spins·mg^(−1),the corresponding piezoelectric coefficient and carrier concentration are 13.9 pm·V^(−1) and 2.90×10^(20) cm^(−3),*** optimal hydrogen production rate per power of 2.21μmol·g^(−1)·h^(−1)·W^(−1) is equivalent to or even better than that of most reported *** piezoelectric coefficient and carrier concentration,as two factors,jointly determine the piezocatalytic *** findings of this research can provide important and deep-seated insights for better piezocatalysts in the future.

关键词： piezocatalysis oxygen vacancy carrier concentration piezoelectric coefficient hydrogen evolution

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Mitigating Fast Thermal Instability by Engineered Laser Sweep in AIN Soliton Microcomb Generation

Mitigating Fast Thermal Instability by Engineered Laser Swee...

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2023 Asia Communications and Photonics Conference/2023 International Photonics and Optoelectronics Meetings, ACP/POEM 2023

作者： Wang, Zihao Liu, Kewei Yao, Shunyu Guo, Yanan Yan, Jianchang Wang, Junxi Yang, Changxi Bao, Chengying Tsinghua University State Key Laboratory of Precision Measurement Technology and Instruments Department of Precision Instruments Beijing100084 China University of the Chinese Academy of Sciences Center for Materials Science and Optoelectronics Engineering Beijing100049 China Institute of Semiconductors Chinese Academy of Sciences Research and Development Center for Solid State Lighting Beijing100083 China

ISBN: (纸本)9798350312614

Transient thermal instability represents a significant challenge in generating soliton microcombs. Fast laser sweep can be an efficient method to mitigate thermal instability, but it would require ultrahigh laser sweep rate for crystalline microresonators with fast thermal relaxation. Here, we engineer the laser sweep waveform to generate AIN-on-sapphire soliton microcombs with an intermediate sweep speed ( © 2023 IEEE.

关键词： fast laser sweep soliton microcombs thermal instability

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双金属电子诱导CoNi LDH-GO相变以提升其析氧和超级电容器性能

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science China materials 2023年第2期66卷 577-586页

作者：赵文华刘婷婷吴念独周博烨闫玉香叶永春巩江峰杨绍光 School of Physics National Laboratory of Solid State MicrostructuresCollaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210093China School of Optoelectronic Science and Engineering Collaborative Innovation Center of Suzhou Nano Science and TechnologySoochow UniversitySuzhou 215006China College of Materials and Chemistry China Jiliang UniversityHangzhou 310018China College of Science Hohai UniversityNanjing 211199China

双功能能源材料在能量转换和储存方面具有重要的研究价值.本文通过双金属电子调节和氧化石墨烯(GO)辅助制备出双功能α相Co_(2)Ni_(1)LDH-GO.在不添加GO的情况下,Co_(2)Ni_(1)LDH主要由β相组成.与β相相比,α相Co_(2)Ni_(1)LDH-GO表现... 详细信息

双功能能源材料在能量转换和储存方面具有重要的研究价值.本文通过双金属电子调节和氧化石墨烯(GO)辅助制备出双功能α相Co_(2)Ni_(1)LDH-GO.在不添加GO的情况下,Co_(2)Ni_(1)LDH主要由β相组成.与β相相比,α相Co_(2)Ni_(1)LDH-GO表现出更大的层间距,缩短了离子的转移路径和时间,从而提升了其电化学性能.作为能量转换中析氧的电催化剂,超薄α相Co_(2)Ni_(1)LDH-GO在10 mA cm^(-2)的电流密度下具有最低的过电位η10=218.5 ***^(2+)的协同电子调控促使Co–O键形成,使其具有良好的稳定性.随着Co–O键长的增加,吸附的OH-进一步将Co^(3+)氧化为Co^(4+).作为三电极储能超级电容器中的电极,Co_(2)Ni_(1)LDH-GO的比电容可达3317.5 F g^(-1).当用于不对称电容器(Co_(2)Ni_(1)LDH-GO//活性炭)时,Co_(2)Ni_(1)LDH-GO显示出大的电容(328.75 Fg^(-1))和出色的循环稳定性.本工作为通过相变方法改善多功能材料的析氧和超级电容器性能的研究提供理论依据.

关键词：超级电容器电催化剂能量转换比电容多功能材料双金属电化学性能析氧

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In situ TEM dark-field observation on ferroelectric/ferroelastic domain evolution in ferroelectrics sub-micrometer pillar under stress 2

In situ TEM dark-field observation on ferroelectric/ferroela...

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2nd International Conference on Mechanical Automation and engineering materials, MAEM 2023

作者： Ren, Yifeng Li, Jiayi Yang, Haixing Pang, Zhentao Wu, Jie Liu, Zhiyu Fu, Shaojie Wang, Meiyu Deng, Yu School of Physics Nanjing University Nanjing210093 China Solid State Microstructure National Key Lab Collaborative Innovation Center of Advanced Microstructures Nanjing University Nanjing210093 China Department of Materials Science and Engineering College of Engineering and Applied Sciences Nanjing University Nanjing210093 China

The evolution of ferroelectric/ferroelastic domains in ferroelectric materials (FMs) under stress fields is a significant yet complex process. This process involves the interaction of hierarchical domain structures across scales, as well as the coupling of elastic and electrical potentials. To understand the critical local microstructure evolution, here we used in situ transmission electron microscopy (TEM) to directly observe the hierarchical domain evolution induced by stress in BaTiO3 and Pb(Mg1/3Nb2/3)O3-PbTiO3 (PMN-PT) sub-micrometer pillars. The results indicate that domain evolution is sensitive to the loading methods, including loading/unloading speed, stress maintenance duration, and stress amplitude. Assisted by phase-field simulations, we have proved that mobile point defect pinning effect also influence the domain evolution greatly. Based on above understanding, we successfully achieved a large recoverable deformation in PMN-PT pillar with 10% strain. Our findings provide a novel avenue to develop super-flexibility in FMs. © Published under licence by IOP Publishing Ltd.

关键词： Ferroelectric materials

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A triboelectric/electromagnetic hybrid generator for efficient wind energy collection and power supply for electronic devices

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science China(Technological sciences) 2021年第9期64卷 2003-2011页

作者： XU GuanPing ZHENG YouBin FENG YanGe MA ShaoChen LUO Ning FENG Min CHEN ShouGang WANG DaoAi State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000China School of Materials Science and Engineering Ocean University of ChinaQingdao 266100China Qingdao Center of Resource Chemistry and New Materials Qingdao 266100China

Harvesting energy from ambient environment has been considered as a promising strategy for driving portable electronic devices in a sustainable way. A wind driven triboelectric-electromagnetic hybrid nanogenerator has been fabricated to convert wind energy into electricity. It is composed of an electromagnetic generator(EMG) and a triboelectric nanogenerator(TENG) with the output power of 35 and 0.32 mW, respectively when the wind speed is 5 m/s. Generally, TENG shows a low current output with a high voltage output characteristic, on the contrary the EMG shows a high current output and a low voltage output. This hybrid nanogenerator overcomes these problems and exhibits comprehensive and efficient performance on scavenging ***, in view of the output performance and charging ability of the hybrid nanogenerator, it shows high stability, making it suitable for charging capacitors or batteries and driving portable electronics sustainably. A new structure of integrated TENG and EMG was designed to harvest wind energy, which shows potential applications in portable and small device power supply system, especially in the areas of remote mountains, deserts, islands, etc., as emergency power supply.

关键词： TENG electromagnetic generator wind energy self-powered selective power supply

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Combined effects of interface modification and micro-filler reinforcements on the thermal and tribological performances of fabric composites

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Friction 2021年第5期9卷 1110-1126页

作者： Junya YUAN Zhaozhu ZHANG Mingming YANG Xin ZHAO Liangfei WU Peilong LI Wei JIANG Xuehu MEN Weimin LIU State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China School of Physical Science and Technology Lanzhou UniversityLanzhou 730000China

The high specific‐strength of glass fibers and exceptional self‐lubrication of polytetrafluoroethylene(PTFE)fibers promote the potential application of hybrid PTFE/glass fabric composites in the tribological field,but their weak interfacial adhesion and inferior thermal properties significantly inhibit their tribological performance and ***,a hybrid of polydopamine/silicon carbide/polyethyleneimine(PDA/SiC/PEI)functional coating was co‐deposited onto the hybrid PTFE/glass fabric surface through a one‐step impregnation method,leading to increased surface roughness and abundant amine *** and peeling tests showed that this functional coating offered 47.8%enhancement in the fabric/matrix interfacial adhesion without compromising the strength of the pristine ***,the additional incorporation of WS_(2),and aluminum nitride(AlN)micro‐fillers contributed to the development of a high‐quality tribofilm and improved the thermal properties of fabric *** results of wear tests proved that the hybrid‐fabric composites,after the introduction of functional coating and micro‐fillers,exhibited outstanding tribological performance,which was attributed to the superior interfacial adhesion as well as the synergistic enhancement effects between WS2 and AlN micro‐fillers.

关键词： fabric polymer composites synergistic effect friction and wear

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