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Dynamic cooperations between lattice oxygen and oxygen vacancies for photocatalytic ethane dehydrogenation by a self-restoring LaVO_(4)catalyst

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Chinese Chemical Letters 2024年第3期35卷 171-176页

作者： Fen Wei Weichao Xue zhiyang yu Xue Feng Lu Sibo Wang Wei Lin Xinchen Wang State Key Laboratory of Photocatalysis on Energy and Environment College of ChemistryFuzhou UniversityFuzhou 350108China

Thermocatalytic nonoxidative ethane dehydrogenation(EDH)is a promising strategy for ethene production but suffers from intense energy consumption and poor catalyst durability;exploring technology that permits efficient EDH by solar energy remains a giant ***,we present that an oxygen vacancy(O_v)-rich LaVO_(4)(LaVO_(4)-O_v)catalyst is highly active and stable for photocatalytic EDH,through a dynamic lattice oxygen(O_(latt.))and O_(v)co-mediated *** by simulated sunlight at mild conditions,LaVO_(4)-O_(v)effectively dehydrogenates undiluted ethane to produce C_(2)H_(4)and CO with a conversion of 2.3%.By loading a small amount of Pt cocatalyst,the evolution and selectivity of C_(2)H_(4)are enhanced to 275μmol h^(-1)g^(-1)and 96.8%.Of note,LaVO_(4)-O_(v)appears nearly no carbon deposition after the *** isotope tracked reactions reveal that the consumed O_(latt.)recuperates by exposing the used catalyst with O_(2),thus establishing a dynamic cycle of O_(latt.)and achieving a facile catalyst regeneration to preserve its intrinsic *** refreshed LaVO_(4)-O_(v)exhibits superior reusability and delivers a turnover number of about *** O_(v)promotes photo absorption,boosts ethane adsorption/activation,and accelerates charge separation/transfer,thus improving the photocatalytic *** possible photocatalytic EDH mechanism is proposed,considering the key intermediates predicted by density functional theory(DFT)and monitored by in-situ diffuse reflectance infrared Fourier transform spectroscopy(DRIFTS).

关键词： Photocatalysis Ethane dehydrogenation Ethene LaVO_(4) Oxygen vacancy

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Tuning the exciton binding energy of covalent organic frameworks for efficient photocatalysis

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Chinese Chemical Letters 2024年第2期35卷 577-583页

作者： Zhangjie Gu Zhen Shan yulan Wang Jinjian Wang Tongtong Liu Xiaoming Li zhiyang yu Jian Su Gen Zhang Key Laboratory for Soft Chemistry and Functional Materials of Ministry of Education School of Chemistry and Chemical EngineeringNanjing University of Science and TechnologyNanjing 210094China State Key Laboratory of Photocatalysis on Energy and Environment College of ChemistryFuzhou UniversityFuzhou 350002China MIIT Key Laboratory of Advanced Display Material and Devices School of Materials Science and EngineeringNanjing University of Science and TechnologyNanjing 210094China Key Laboratory of Preclinical Study for New Drugs of Gansu Province School of Basic Medical SciencesLanzhou UniversityLanzhou 730000China

Owing to the large exciton binding energy(>100 meV)of most organic materials,the process of exciton dissociation into free electrons and holes is seriously hindered,which plays a key role in the photocatalytic *** this study,a series of chalcogen(S,Se)-substituted mesoporous covalent organic frameworks(COFs)have been synthesized for enhanced photocatalytic organic *** measurements indicate that the introduction of semi-metallic Se atom and the enlargement of conjugation degree can not only reduce the exciton binding energy accelerating the charge separation,but also reduce the band gap of *** a result,the COF-NUST-36 with the lowest exciton binding energy(39.5 meV)shows the highest photocatalytic performance for selective oxidation of amines(up to 98%*** 97.5%Sel.).This work provides a feasible method for designing COFs with high photocatalytic activity by adjusting exciton binding energy.

关键词： Covalent organic frameworks Exciton binding energy Atom substitution Extended conjugation Photocatalysis

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城轨交通车地通信综合承载系统

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中国铁路 2024年第4期 79-84页

作者：禹志阳石雪涛郜新军中国铁道科学研究院集团有限公司通信信号研究所北京100081 北京交通大学轨道交通信号及控制国家重点实验室北京100044

城轨交通传统车地通信依赖地面基站中转,导致较大的信号传输时延;传统通信系统易受基站故障和链路干扰的影响,降低了通信的可靠性,甚至对交通安全造成潜在风险;目前城轨交通轨旁设备多采用有线通信方式,建设与维护成本较高。基于无线自... 详细信息

城轨交通传统车地通信依赖地面基站中转,导致较大的信号传输时延;传统通信系统易受基站故障和链路干扰的影响,降低了通信的可靠性,甚至对交通安全造成潜在风险;目前城轨交通轨旁设备多采用有线通信方式,建设与维护成本较高。基于无线自组织网络(Ad-hoc)的城轨交通车地通信方案可以有效节约布网成本。通过构建以轨旁设备、列车和车站汇聚节点为核心的无线自组织网络,承载城轨交通业务数据传输,降低了控制环节与接口复杂度,能够实现实时的车车、车地安全通信。设计基于无线自组织网络的城轨交通车车通信综合承载系统,并利用无线自组网基站、信道仿真器、可调衰减器等设备在实验室环境下模拟城轨交通环境,验证了车车通信能力。测试结果表明:Ad-hoc系统具有自组织无中心、低网络延时、强网络鲁棒性、多跳传输等特点,能够满足城轨交通业务的需求。

关键词：城轨交通车地通信 Ad-hoc MimoMesh 车车通信综合承载

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列控系统仿真测试关键技术

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中国铁路 2024年第5期 82-89页

作者：禹志阳郜新军万林中国铁道科学研究院集团有限公司通信信号研究所北京100081

随着我国高铁线路网络化规模持续扩大及列控系统运用需求日趋复杂,仿真测试手段作为高铁现场测试的有效补充和完善,已成为列控系统测试技术发展的必然趋势。开展适用于工程化的列控系统仿真测试技术研究,构建基于云平台的总体架构;重点... 详细信息

随着我国高铁线路网络化规模持续扩大及列控系统运用需求日趋复杂,仿真测试手段作为高铁现场测试的有效补充和完善,已成为列控系统测试技术发展的必然趋势。开展适用于工程化的列控系统仿真测试技术研究,构建基于云平台的总体架构;重点研究平台快速搭建与切换、虚实结合与虚实互换、测试案例编制与序列自动生成等关键测试技术,从而实现仿真平台自动测试功能,并结合实际线路进行广泛验证。应用效果表明,仿真测试平台能有效提高测试的覆盖度和测试深度,并在现场试验前提前发现问题,满足工程化应用需求。列控系统仿真测试平台的成功研制,为现场联调联试提供了重要补充。

关键词：列控系统仿真测试云平台虚拟化联调联试

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Computing grain boundary diagrams of thermodynamic and mechanical properties

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npj Computational Materials 2021年第1期7卷 1442-1453页

作者： Chongze Hu Yanwen Li zhiyang yu Jian Luo Department of Nanoengineering University of California San DiegoLa JollaCA 92093USA Program of Materials Science and Engineering University of California San DiegoLa JollaCA 92093USA State Key Laboratory of Photocatalysis on Energy and Environment College of ChemistryFuzhou University350002 FuzhouFujianP.R.China Department of Physics Southern University of Science and TechnologyShenzhenGuangdong 518055P.R.China

Computing the grain boundary(GB)counterparts to bulk phase diagrams represents an emerging research *** a classical embrittlement model system Ga-doped Al alloy,this study demonstrates the feasibility of computing temperature-and composition-dependent GB diagrams to represent not only equilibrium thermodynamic and structural characters,but also mechanical ***,hybrid Monte Carlo and molecular dynamics(MC/MD)simulations are used to obtain the equilibrium GB structure as a function of temperature and *** GB structures are validated by aberrationcorrected scanning transmission electron ***,MD tensile tests are performed on the simulated equilibrium GB *** diagrams are computed for not only GB adsorption and structural disorder,but also interfacial structural and chemical widths,MD ultimate tensile strength,and MD tensile *** study suggests a research direction to investigate GB composition–structure–property relationships via computing GB diagrams of thermodynamic,structural,and mechanical(or potentially other)properties.

关键词： grain toughness alloy

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Structural investigations of a boron carbide nanorod with pseudo-fivefold twinned cross-section

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Science China(Technological Sciences) 2011年第8期54卷 2119-2122页

作者： yu zhiyang FU Xin ZHU Jing Beijing National Center for Electron Microscope Laboratory Department of Materials Science and Engineering Tsinghua University Beijing 100084 China

In this article, a detailed investigation of the cross-section structure of a fivefold twinned boron carbide nanorod is presented. TEM observations reveal that the nanorod possesses a remarkable pseudo-fivefold twinned cross-section which consists of eight subcrystals packing around its fivefold axis. It is proposed that the negative angular mismatch of 5° for the unrelaxed boron carbide nanowires, which arises from the imperfectness of filling five twinned segments into a 360° solid space, is to be accommodated in one single subunit. The nanorod is found to be free from damage during sample preparation and it retains the intrinsic structural distortions of boron carbide nanowires.

关键词： boron carbide fivefold twinned angular misfit characterization

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全息空间三维显示研究

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计量与测试技术 2024年第1期51卷 98-99,104页

作者：于志扬高洪跃刘吉成沈宇贾斌上海大学机电工程与自动化学院精密机械工程系

本文基于计算全息、光电衍射再现及散射成像等技术,研究全息空间三维显示,利用随机相位抑制全息空间三维再现像的散斑噪声,实现高分辨率全息空间三维显示。同时,测试不同厚度的散射介质屏对三维成像的影响,探究全息空间三维显示的亮度... 详细信息

本文基于计算全息、光电衍射再现及散射成像等技术,研究全息空间三维显示,利用随机相位抑制全息空间三维再现像的散斑噪声,实现高分辨率全息空间三维显示。同时,测试不同厚度的散射介质屏对三维成像的影响,探究全息空间三维显示的亮度变化规律。

关键词：全息空间三维显示散射介质屏空间光调制器随机相位

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A versatile defect engineering strategy for room-temperature flash sintering

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Journal of Advanced Ceramics 2022年第7期11卷 1172-1178页

作者： Angxuan WU Ziyang YAN Xilin WANG zhiyang yu Rongxia HUANG Nianping YAN Zhidong JIA Engineering Laboratory of Power Equipment Reliability in Complicated Coastal Environments Tsinghua Shenzhen International Graduate SchoolTsinghua UniversityShenzhen 518055China State Key Laboratory of Photocatalysis on Energy and Environment College of ChemistryFuzhou UniversityFuzhou 350108China School of Electromechanical Engineering Guangdong University of TechnologyGuangzhou 510006China State Grid Jiangxi Electric Power Research Institute Nanchang 330096China

In this study,we reported that flash sintering(FS)could be efficiently triggered at room temperature(25℃)by manipulating the oxygen concentration within ZnO powders via a versatile defect engineering strategy,fully demonstrating a promising method for the repaid prototyping of *** a low concentration of oxygen defects,FS was only activated at a high onset electric field of~2.7 kV/cm,while arcs appearing on the surfaces of ***,the onset electric field was decreased to<0.51 kV/cm for the activation of FS initiated,which was associated with increased oxygen concentrations coupled with increased electrical ***,a general room-temperature FS strategy by introducing intrinsic structural defect is suggested for a broad range of ceramics that are prone to form high concentration of point defects.

关键词： flash sintering(FS) oxygen vacancies defect engineering ZnO powders electric discharge

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数据驱动的中温隔热陶瓷管件结构优化设计及性能评估

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材料科学与工程学报 2024年第3期42卷 372-378,404页

作者：肖卫强杨贤燕周国俊蒋健殷晓红余志扬苟中入浙江中烟工业有限责任公司浙江杭州310024 浙江大学浙江加州国际纳米技术研究院浙江杭州310058 浙江大学流体动力与机电系统国家重点实验室浙江杭州310058 浙江大学原子核农业科学研究所浙江杭州310058

随着中温区电加热的电子产品和家电用品不断涌现,低成本的高效保温隔热材料研究日益成为热点。如何确保管路内部快速升温并避免外表温度大幅波动,有效提高能源利用率,是保温隔热材料领域的挑战。据此,本研究以低熔点玻璃助烧结的镁橄榄... 详细信息

随着中温区电加热的电子产品和家电用品不断涌现,低成本的高效保温隔热材料研究日益成为热点。如何确保管路内部快速升温并避免外表温度大幅波动,有效提高能源利用率,是保温隔热材料领域的挑战。据此,本研究以低熔点玻璃助烧结的镁橄榄石、莫来石、珍珠岩和磷酸锌等复合物陶瓷为对象,从数据驱动的壁内多孔结构隔热管件优化设计出发,开展陶瓷隔热管件三维打印制造,通过显微结构和力学性能分析,并围绕管件的导热、隔热影响因素评估,系统考察了该类新型隔热管件的理化、力学和隔热性能及影响关系。结果表明,通过对沿管壁环绕的矩形大孔高度调控(400~1 200μm)、管腔内热源区的管壁倍增(1.2 mm×2 mm)以及有机微球造孔剂引入(~9%),同时通过烧结温度控制(700~750℃),可以显著改善热流出口区的温度水平(~20℃),并显著优于不锈钢真空隔热管的出口温度。研究结果表明,增材制造复合陶瓷管件具有优良的综合性能以及较低的原料成本,使得多孔陶瓷隔热管件在中温隔热领域具有广阔的应用前景。

关键词：数据驱动多孔陶瓷管中温隔热三维打印

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Fast electrochemical activation of the broadband saturable absorption of tungsten oxide nanoporous film

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Nano Research 2022年第1期15卷 326-332页

作者： Ruipeng Hou Hui Li Mengjuan Diao Yanhui Sun Ying Liang zhiyang yu Zhipeng Huang Chi Zhang School of Chemical Science and Engineering Tongji UniversityShanghai 200092China State Key Laboratory of Photocatalysis on Energy and Environment College of ChemistryFuzhou UniversityFuzhou 350002China

The on-demand modulation of defects in materials for the effective modulation of optical nonlinearity is desirable,while it remains a great *** this work,we demonstrate that electrochemical activation is a facile and convenient approach to modulating the broadband third-order nonlinear absorption of nanoporous tungsten oxide(WO3-x)thin *** film does not exhibit optical nonlinearity at the initial state,while shows a distinct saturable absorption under an applied voltage of-2.5 V with the excitation of 515,800,and 1,030 nm *** nonlinear absorption coefficient(β_(eff))is-766.38±6.67 cm·GW^(-1) for 1,030 nm laser,-624.24±17.15 cm·GW-1 for 800 nm laser,and-120.70±11.49 cm·GW^(-1) for 515 nm laser,and the performance is competitive among inorganic saturable *** activation is accomplished in 2 *** performance enhancement is ascribed to the formation of abundant in-gap defect states because of the reduction of the tungsten atoms,and a Pauli-blocking effect occurs during the excitation of in-gap defect *** small feature size of WO_(3-x)(-12 nm)enables the effective and fast introduction and removal of the defects in porous film,and accordingly the fast and broadband modulation of optical *** results suggest a controllable,effective,and convenient approach to tuning the nonlinear absorption of materials.

关键词： tungsten oxide nonlinear absorption in-gap states electrochemical activation

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