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Controllable oxygen vacancies and morphology engineering:Ultra-high HER/OER activity under base–acid conditions and outstanding antibacterial properties

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Journal of Energy Chemistry 2022年第8期31卷 639-651,I0017页

作者： Hongyao Xue Alan Meng tongqing yang Zhenjiang Li Chunjun Chen College of Electromechanical Engineering Qingdao University of Science and TechnologyQingdao 266061ShandongChina Key Laboratory of Optic-electric Sensing and Analytical Chemistry for Life Science MOECollege of Chemistry and Molecular EngineeringQingdao University of Science and TechnologyQingdao 266061ShandongChina Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of Colloid and Interface and ThermodynamicsCAS Research/Education Center for Excellence in Molecular SciencesInstitute of ChemistryChinese Academy of Sciences 2Beijing 100190China School of Chemistry and Chemical Engineering University of Chinese Academy of SciencesBejing 100049China

Introducing vacancy defects and unique morphology is an effective strategy to improve the catalytic performance of transition metal ***,precisely controlling the amount of vacancy defects remains ***,we propose a facile and efficient hydrothermal accompanying an annealing method to synthesize a series of Mn-doped CoO nanomaterials with controllable oxygen vacancies and unique *** oxygen vacancies amount can be precisely controlled by adjusting the Mndoping content and is positively correlated with catalytic *** was found that the oxygen vacancies amount can reach up to 38.2%over the Mn-doped CoO nanomaterials,resulting in ultra-high hydrogen evolution reaction(HER)and oxygen evolution reaction(OER)catalytic activity(HER:25.6 and 37 m V at 10 m A cm^(-2);OER:301 and 322 m V at 50 m A cm^(-2))under both basic and acidic conditions,while reaching 10 m A cm^(-2) for an ultra-low cell voltage of only 1.52 V,which exceeds that of Pt/C/RuO_(2) and all reported non-noble metal oxide *** DFT calculations reveal oxygen vacancies can optimize H*and HOO*intermediates adsorption free energy,thus improving the HER and OER ***,the Mn-doped CoO with rich oxygen vacancies exhibits excellent antibacterial properties in vitro of *** work provides new ideas and methods for the rational design and precise control of vacancy defects in transition metal compounds and explores their potential application value in electrochemical water splitting and biomedical fields.

关键词： Oxygen vacancies Mn-doping HER OER Antibacterial

Phenomenon of multiple field-induced phase transition in PLZST antiferroelectric ceramics

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Chinese Science Bulletin 1998年第11期43卷 961-964页

作者： Liu Peng yang tongqing Xu Zhuo Zhang Liangying Yao Xi Xian Jiao Tong Univ Elect Mat & Device Res Lab Xian 710049 Peoples R China

The multiple field-induced phase transition in 4 at.% La modified Pb(Zr,Sn,Ti)O 3 family with temperature from -40℃ to 45℃ in reported. Two electric field-induced transitions from a metastable antiferroelectric phase to two ferroelectric phases are observed is polarization at the applied field of 4 MV/m. The critical field of phase transition between two ferroelectric phases is not larger than 2.5 MV/m, about ten to twenty percent of that ever found in PZT based ceramics. Lattice structure is shown to be orthorhombic by X-ray diffraction. Dielectric investigation reveals a relaxor-like ferroelectric behavior. Temperature-electric field phase diagram is also presented. An appreciate kind of materials is provided to investigate multiple field-induced phase transition with PZT-based ceramics.

关键词： antiferroelectric-ferroelectric phase transition field-induced phase transition multiple phase transition ceramics low electric field.

Incorporation of dysprosium ions into PbTiO_(3) ferroelectric ceramic system

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Journal of Advanced Dielectrics 2015年第1期5卷 29-33页

作者： A.Peláiz-Barranco Y.Mendez-González Jinfei Wang tongqing yang Facultad de Física-IMRE Universidad de La Habana.San Lázaro y L Vedado.La Habana 10400Cuba Functional Materials Research Laboratory College for Materials Science and Engineering Tongji University 4800 CaoanShanghai 201804P.R.China

A structural analysis concerning the incorporation of dysprosium into A-and/or B-sites of the lead titanate is *** two"boundary"refinements are presented,i.e.,Dy^(2+)substitutes for Pb^(2+)(Dy^(3+)substitutes for Ti^(4+))and Dy^(3+)substitutes for Pb^(2+)(Dy^(3+)substitutes for Ti^(4+)).The results offer quantitative information about the incorporation into both crystallographic *** increase of Dy^(3+)fraction into B-site provides the increase of the Ti^(4+)atomic displacement along the[001]direction and the tetragonal distortion.

关键词： Lead titanate lanthanides perovskites crystalline structure

Soil properties and not plant factors affect both abundant and rare microbial taxa after thinning in a mixed stand of Cunninghamia lanceolata and Sassafras tzumu

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Journal of Forestry Research 2024年第2期35卷 81-94页

作者： Wanxia Peng tongqing Song Hu Du Feng Wang Fuping Zeng yang Wang Shulin Chen Yinzhu Chen Key Laboratory of Agro‑Ecological Processes in Subtropical Region Institute of Subtropical AgricultureChinese Academy of SciencesChangsha 410125People’s Republic of China Guangxi Industrial Technology Research Institute for Karst Desertification Control Nanning 530001People’s Republic of China Huanjiang Observation and Research Station for Karst Ecosystems Institute of Subtropical AgricultureChinese Academy of SciencesChangsha 410125People’s Republic of China Hubei Ecology Polytechnic College Wuhan 430200People’s Republic of China Hubei Tongshan Damushan State Forest Farm Tongshan 437652People’s Republic of China

Thinning is an effective management step for sustainable forest development,yet less attention is paid to the restoration of soil microbiota after *** this study,both abundant and rare soil microbial communities(i.e.,bacterial,fungal),were evaluated under various thinning treatments in a mixed stand of Cunninghamia lanceolata and Sassafras tzumu using Mi Seq *** did not significantly change either abundant or rare bacterial and fungal community composition,but affected their alpha *** Shannon–Wiener indexes of rare fungal taxa under medium thinning were significantly lower than in the light thinning(P<0.05 level).Xanthobacteraceae dominated the abundant bacterial taxa,and Saitozyma and Mortierlla the abundant fungal *** most common rare bacterial taxa varied;there was no prevalent rare fungal taxa under different *** addition,soil available nitrogen,total phosphorus,and p H had significant effects on rare bacterial ***,especially available phosphorus,but not nitrogen,affected abundant and rare soil *** results indicate that soil properties rather than plant factors affect abundant and rare microbial communities in soils of mixed ***,through mediating soil properties,influences both abundant and rare bacterial and fungal communities in the mixed *** and *** stand.

关键词： Diversity Abundant taxa Rare taxa Thinning Mixed stand

Switching and energy-storage characteristics in PLZT 2/95/5 antiferroelectric ceramic system

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Journal of Advanced Dielectrics 2016年第4期6卷 1-4页

作者： A.Pelaiz-Barranco Y.Mendez-Gonzalez J.D.S.Guerra Xiucai Wang tongqing yang Facultad de Fisica-IMRE Universidad de La Habana San Lazaroy LVedadoLa Habana 10400Cuba Grupo de Ferroeletricos e Materiais Multifuncionais Instituto de Fsica Universidade Federal de Uberlandia38408-100Uberlandia-MGBrazil Functional Materials Research Laboratory College for Materials Science and EngineeringTongji University4800 CaoanShanghai 201804P.R.China

Switching mechanisms and energy-storage properties have been investigated in(Pb_(0.98)La_(0.02)T(Zr_(0.95)Ti_(0.05)T_(0.995O_(3)) antiferroelectric *** electric field dependence of polarization(P–E hysteresis loops)indicates that both the ferroelectric(FE)and antiferroelectric(AFE)phases coexist,being the AFE more stable above 100℃.It has been observed that the temperature has an important influence on the switching *** the other hand,the energy-storage density,which has been calculated from the P–E hysteresis loops,shows values higher than 1 J/cm^(3) for temperatures above 100℃ with around 73%of efficiency as *** properties indicate that the studied ceramic system reveals as a promising AFE material for energy-storage devices application.

关键词： Antiferroelectrics energy-storage switching.

Unsupervised Time Series Segmentation: A Survey on Recent Advances

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Computers, Materials & Continua 2024年第8期80卷 2657-2673页

作者： Chengyu Wang Xionglve Li tongqing Zhou Zhiping Cai College of Computer National University of Defense TechnologyChangsha410073China

Time series segmentation has attracted more interests in recent years,which aims to segment time series into different segments,each reflects a state of the monitored *** there have been many surveys on time series segmentation,most of them focus more on change point detection(CPD)methods and overlook the advances in boundary detection(BD)and state detection(SD)*** this paper,we categorize time series segmentation methods into CPD,BD,and SD methods,with a specific focus on recent advances in BD and SD *** the scope of BD and SD,we subdivide the methods based on their underlying models/techniques and focus on the milestones that have shaped the development trajectory of each *** a conclusion,we found that:(1)Existing methods failed to provide sufficient support for online working,with only a few methods supporting online deployment;(2)Most existing methods require the specification of parameters,which hinders their ability to work adaptively;(3)Existing SD methods do not attach importance to accurate detection of boundary points in evaluation,which may lead to limitations in boundary point *** highlight the ability to working online and adaptively as important attributes of segmentation methods,the boundary detection accuracy as a neglected metrics for SD methods.

关键词： Time series segmentation time series state detection boundary detection change point detection

Effects of glass additions on energy storage performance of(Pb_(0.9)7La_(0.02))(Zr_(0.92)Sn_(0.05)Ti_(0.03))O_(3) antiferroelectric thick films

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Journal of Advanced Dielectrics 2013年第2期3卷 47-51页

作者： Shengchen Chen tongqing yang Jinfei Wang Xi Yao Functional Materials Research Laboratory Tongji UniversitySiping Road 1239Shanghai 20092P.R.China

50μm-thick(Pb_(0.9)7La_(0.02))(Zr_(0.92)Sn_(0.05)Ti_(0.03))O_(3) antiferroelectric(AFE)thick films with different amount of 0.8Pb_O-0.2B_(2)O_(3) glass additions were fabricated by the screen-printing method on alumina substrate,which was pre-coated with Pt as *** effects of glass additions on dielectric properties and energy storage performance were investigated in *** to the enhancement of breakdown strength(BDS)of the specimens by the addition of glass,the energy storage performances of the thick films could be greatly *** a result,with 3%glass addition,the BDS of the specimens were as high as 475 kV/cm,the maximum polarization of 34.8μC/cm^(2) and the maximum recoverable energy storage density of 7.4 J/cm^(3) were *** results indicated the(Pb_(0.9)7La_(0.02))(Zr_(0.92)Sn_(0.05)Ti_(0.03))O_(3) (PLZST)thick films have a promising potential application in capacitors for pulsed power systems.

关键词： Dielectric properties thick films microstructure energy storage

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Bi基微波介质材料研究进展

硅酸盐学报 2006年第11期34卷 1374-1381页

作者：陈凯沈波姚熹杨同青同济大学功能材料研究所上海200092

低温烧结微波介质陶瓷是近年来电介质材料方面的一个重要研究方向,也是发展片式多层微波器件的基础材料。Bi基材料具有较低的烧结温度和优良的介电性能,因而受到了广泛的关注。据此,对不同介电常数Bi基微波介质材料体系的研究进展及应... 详细信息

低温烧结微波介质陶瓷是近年来电介质材料方面的一个重要研究方向,也是发展片式多层微波器件的基础材料。Bi基材料具有较低的烧结温度和优良的介电性能,因而受到了广泛的关注。据此,对不同介电常数Bi基微波介质材料体系的研究进展及应用作了综合介绍,并分析了低熔点氧化物掺杂、离子取代对不同体系微波介质材料结构、介电性能的影响。

关键词：铋基陶瓷低温共烧陶瓷微波介质材料介电性能

Time-Domain Analysis of Body Freedom Flutter Based on 6DOF Equation

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工程与科学中的计算机建模(英文) 2024年第1期138卷 489-508页

作者： Zhehan Ji tongqing Guo Di Zhou Zhiliang Lu Binbin Lyu Key Laboratory of Unsteady Aerodynamics and Flow Control Ministry of Industry and Information TechnologyNanjing University of Aeronautics and AstronauticsNanjing210016China High Speed Aerodynamics Institute China Aerodynamics Research and Development CenterMianyang621000China

The reduced weight and improved efficiency of modern aeronautical structures result in a decreasing separation of frequency ranges of rigid and elastic ***,a high-aspect-ratio flexible flying wing is prone to body freedomflutter(BFF),which is a result of coupling of the rigid body short-periodmodewith 1st wing *** prediction of the BFF characteristics is helpful to reflect the attitude changes of the vehicle intuitively and design the active flutter suppression control *** of using the rigid body mode,this work simulates the rigid bodymotion of the model by using the six-degree-of-freedom(6DOF)equation.A dynamicmesh generation strategy particularly suitable for BFF simulation of free flying aircraft is *** accurate Computational Fluid Dynamics/Computational Structural Dynamics/six-degree-of-freedom equation(CFD/CSD/6DOF)-based BFF prediction method is ***,the time-domain CFD/CSD method is used to calculate the static equilibrium state of the *** on this state,the CFD/CSD/6DOF equation is solved in time domain to evaluate the structural response of *** combinedwith the variable stiffnessmethod,the critical flutter point of the model is *** method is applied to the BFF calculation of a flyingwing *** calculation results of the BFF characteristics of the model agree well with those fromthe modalmethod andNastran ***,the method is used to analyze the influence factors of *** analysis results show that the flutter speed can be improved by either releasing plunge constraint or moving the center ofmass forward or increasing the pitch inertia.

关键词： Body freedom flutter time-domain CFD/CSD/6DOF method dynamic mesh generation strategy aeroelasticity