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Influence of temperature on microstructure and electrical properties of Zinc doped CCTO ceramics

2011年全国压电和声波理论及器件应用研讨会

作者： dong xu~(1,2,3,*) Juan ZHANG~1 Yongfang CHEN~1 1 school of material science and engineering,jiangsu university,zhenjiang 212013 2 state key laboratory of electrical insulation and power equipment,xi’an jiaotong university, xi’an 710049 3 state key laboratory of new ceramic and fine processing,tsinghua university,beijing 100083

CaCuTiO(CCTO) ceramics doped with different proportions of EuO dopant(w%,x=0,0.40%,0.80%,0.12%, 0.18%) are prepared by the traditional solid-state reaction *** and XRD are used in the microstructural studies of the specimens;at the same time,the electrical properties andⅤ-Ⅰcharacteristics of the varistor ceramics samples were investigated by a DC parameter instrument for *** analysis of the samples shows that the

关键词： CaCu3Ti4O12 Rare earth Dielectric properties Varistor Microstructure

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Influence of temperature on microstructure and electrical pr...

Identification of Motor Nuclei in the Medulla Oblongata of Carp for Biological Control

2011年全国压电和声波理论及器件应用研讨会

作者： dong xu~(1,2,3,*)Yongfang CHEN~1 Song BAI~1 1 school of material science and engineering,jiangsu university,zhenjiang 212013 2 state key laboratory of electrical insulation and power equipment,xi"an jiaotong university.xi’an 710049 3 state key laboratory of new ceramic and fine processing,tsinghua university,beijing 100083

This study investigates the influence of sintering temperature on microstructure and dielectric properties of Zn doped CaCuTiO(CCTO) *** CaCuZnTiO(CCZTO)(χ=0,0.06,0.1,0.2) ceramics were prepared by sol-gel method,and... 详细信息

关键词： CaCu3Ti4O12 Temperature Dielectric properties Varistor Microstructure

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Journal of Bionic engineering 2024年第2期21卷 842-851页

作者： yang zhao Yong Peng Yudong Wen Lingjun Han yanhong yan xueying dong Hui Zhang Zheng zhao xiaoyue Liu school of electrical engineering Yanshan UniversityQinhuangdao066004China school of Mechanical engineering Yanshan UniversityQinhuangdao066004China key laboratory of National Defense of Mechanical Structure and material science Under Extreme Conditions Yanshan UniversityQinhuangdao066004China Institute of Marine science and engineering Yanshan UniversityQinhuangdao066004China Shijiazhuang university Shijiazhuang050035China

Brain-controlled technology is the key technology in biological control,and the corresponding relationship between animal brain nuclei and motor behavior is the *** purpose of this study was to explore the motor nuclei of the medulla oblongata in *** carps were subjected to electrical stimulation and chemical stimulation experiments,respectively,in the water-free state,and the effective chemical stimulation sites were injected with the pontamine sky blue *** brain tissue sections were obtained by paraffin tissue section technology and the neutral red staining *** comparing the positions of the brain nuclei shown in earlier studies,the motor nerve nuclei in the medulla oblongata were *** brain electrode was implanted into the motor nucleus of the medulla oblongata,and the underwater control experiment and behavioral tests were carried out with different electrical stimulation *** results showed that the abducens nucleus(NVI)was the motor nucleus that controls the ipsilateral steering,and the facial nucleus(NVII)was the motor nucleus that controls the forward *** adjusting the stimulation voltage and the stimulation pulse number,the carp can be stably controlled to achieve a left–right steering motion of 30°–180°and a forward motion of more than 80 cm/*** study indicated that the quantitative control of the steering and forward behavior of the carp can be achieved by electrical stimulation of the NVI and NVII,which provided a certain experimental basis for the accurate control of the carp robot.

关键词： Biological control Carp Medulla oblongata motor nucleus electrical stimulation technique Chemical stimulation technique

Finite-temperature ductility-brittleness and electronic structures of Al_(n)Sc(n=1,2 and 3)

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Rare Metals 2024年第8期43卷 3974-3989页

作者： xue-Qian Wang Ying zhao Hao-xuan Liu Shu-Chen Sun Hong-Bo yang Jia-Min Zhong Gan-Feng Tu Song Li Yu-dong Zhang Claude Esling Hai-Le yan Liang Zuo key laboratory for Anisotropy and Texture of materials(Ministry of Education) School of Material Science and EngineeringNortheastern UniversityShenyang 110819China school of Metallurgy Northeastern UniversityShenyang 110819China Rare Earth Functional materials(xiong'an)Innovation Center Co. Ltd.Xiong'an 071700China Laboratoire d'étude des Microstructures et de Mécanique des Matériaux(LEM3) Unikersitéde Lorraine57045MetzFrance

Finite-temperature ductility-brittleness and electronic structures of Al_(3)Sc,Al_(2)Sc and AlSc are studied comparatively by first-principles calculations and ab initio molecular *** show that Al_(3)Sc and Al_(2)Sc are brittle at both ground state and finite temperatures,while AlSc possesses a significantly superior *** ground state,AlSc is ductile from Pugh's and Poisson's criteria,while it is brittle in Pettifor's *** ductility of all Al_(3)Sc,Al_(2)Sc and AISc improves greatly with the elevated ***,the Cauchy pressure of AlSc undergoes a transition from negative to *** T>600 K,AlSc is unequivocally classified as ductile from all criteria *** all compounds,the Al-Al bond originated from s-p and p-p orbital hybridizations,and the Al-Sc bond dominated by p-d covalent hybridization,are the first and second strongest chemical bonds,*** explain the difference in mechanical properties,the mean bond strength(MBS)is introduced in this *** weaker Al-Al bond in AlSc,leading to a smaller MBS,could be the origin of the softer elastic stiffness and superior intrinsic *** longer length of the Al-Al bond in AlSc is responsible for its weaker bond ***,the enhanced metallicity of the Al-Al bond in AlSc would also contribute to its exceptional *** longer length of the Al-Al bond in AISc is responsible for its weaker bond ***,the enhanced metallicity of the Al-Al bond in AlSc would also contribute to its exceptional ductility.

关键词： Al-Sc Target materials Intrinsic ductility Finite-temperature elastic constant First-principles calculation

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Regulated reaction pathway of CO_(2)photoreduction into CH_(4)by metal atom pair sites

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Rare Metals 2024年第9期43卷 4620-4627页

作者： dong-Po He Guang-bing Huang Jun Hu yang Wu xiao-dong Li Qing-xia Chen Shan Zhu Wen-Sheng yan Jun-Fa Zhu yang Pan xing-Chen Jiao key laboratory of Synthetic and Biological Colloids Ministry of EducationSchool of Chemical and Material EngineeringJiangnan UniversityWuxi 214122China Hefei National Research Center for Physical sciences at Microscale National Synchrotron Radiation LaboratoryUniversity of Science and Technology of ChinaHefei 230026China Max Planck Institute of Microstructure Physics Weinberg 206120 HalleGermany state Grid Anhui Electric power Research Institute Hefei 230601China

The carbon dioxide(CO_(2))reduction process involves complex protonation,making the resulting product often *** achieve the desired product,it is crucial to manipulate the reaction ***,we build the metal atom pair sites for selective CO_(2)photoreduction into *** a prototype,Ni atom pair sites loaded on the Mo S_(2)nanosheets were synthesized and verified by highresolution transmission electron microscopy(HRTEM),X-ray photoelectron spectroscopy(XPS)and X-rayabsorption near edge structure spectra(XANES).In-situ Fourier transform infrared spectroscopy(FTIR)monitors the*CHO group,a crucial intermediate in CH_(4)production,during CO_(2)photoreduction on the Ni-Mo S_(2)nanosheets,whereas this monitoring is not observed for the Mo S_(2)***,theoretical calculations disclose that over the Ni-Mo S_(2)nanosheet slab,the formation energy of*CHO intermediates is determined to be lower(0.585 e V)than the desorption energy of*CO intermediates for CO production(0.64 e V),implying the higher selectivity of CH_(4)production.

关键词： steps dioxide desired

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An universal in-situ phosphating strategy to fabricate high-performance Co2P-based bifunctional oxygen electrocatalyst derived from conjugated polyaniline-phytic acid copolymer

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Rare Metals 2024年第11期 5823-5834页

作者： Wen-xue Chen Yue Du Li-Na Zhou Zhi-Yi Zhong Zhi-xian Shi yan Mao Zi-Quan Zhou Hao-Yue Feng Yu Su Hai-yan Hu Shi Li dong-bin xiong Jian-Qin Zhou Yi-Si Liu Yao xiao Hubei key laboratory of Photoelectric materials and Devices School of Material Science and EngineeringHubei Normal University College of Chemistry and materials engineering Wenzhou University Hangzhou Hangyang Chemical and Medical engineering Lo. key laboratory of Advanced Energy materials Chemistry (Ministry of Education) Nankai University Innovative Centre for Flexible Devices (iFLEX) Max Planck-NTU Joint Lab for Artificial SensesSchool of Materials Science and EngineeringNanyang Technological University

Electrocatalysts play a crucial role in the performance of rechargeable Zn-air batteries（ZABs）,but it is still difficult to produce nonprecious materials with excellent bifunctional oxygen reduction reactions（ORR） and oxygen evolution reactions（OER）.Herein,conjugated polyaniline-phytic acid polymer（pANI-PA） was directly calcined to fabricate Co2P nanoparticles embedded in N,P-doped carbon network composites（Co2P@pDC-PA） for metal-air *** resulting pANI-PA derived Co2Pbased carbon composite exhibits exceptional bifunctional ORR/OER activities with a half-wave potential of 0.79 V for ORR and 1.62 V of over-potential for OER at 10mA·*** to the synergistic effect of its unique three-dimensional（3D） structure,N,P-doped carbon framework,and encapsulated Co2P nanoparticles,as-fabricated composite can be used as a highly efficient air cathode in the rechargeable metal-air *** assembled rechargeable ZAB demonstrates a high-power density of 190.0 mW·cm-2and remarkable cycling stability over1000 *** study introduced a novel approach that paves the way for the efficient,cost-effective,and scalable production of bifunctional electrocatalysts for rechargeable ZABs.

关键词：

Frontiers in high entropy alloys and high entropy functional materials

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Rare Metals 2024年第10期43卷 4639-4776页

作者： Wen-Tao Zhang Wen Huang Fu-Jie Yu Qi zhao xin-dong Zhu Tao Feng Yao jiang xiao-Ming Li xue-Fei Miao He Zhu Si Lan xue-Qian Wang Bao-Long Shen Zhe Jia Feng-Qi Zhang Wei Wang Qi Liu yang Ren xun-Li Wang xiao-Ya Cui xiao-yang Wang Ya-Nan Chen bing-bing Fan Meng-Ru Li Qi-Long Gao Jia-Ming Guo Zeng-Bao Jiao Zhi-Min Guo Yu-Ping zhao Qian Yu Rui Huang Ling-Kun Zhang Yi-Ping Lu xu-Bo Li Huai-Jun Lin yan Ma Wei-Ming yang Zhi-Hua Shen Hai-yan He Yong-Gang Sun Yong-jiang Huang De-Zhuang Wang Qing-Feng Liu Fei-yang Wang Hui Liu Hong-Hui Wu Li-Qiang Wang yang Lu Nan Wang Tian-Li Wang Wei-bing Liao Yi-Han Wang Yuan Wu Yu-Zhen Yin Jie Pan Yi Zhang Qing Wang Jian-yang Zhang Tao yang Yasir Sohail Jin-Yu Zhang Hua Ji Qiang Li Wei-Di Liu Zhi-Gang Chen xiong-Jun Liu Wen Ma Liang Mao Zhen-Duo Wu school of materials science and engineering Nanjing University of Science and Technology jiangsu key laboratory for Advanced Metallic materials School of Materials Science and Engineering Southeast University Department of Physics City University of Hong Kong school of materials science and engineering Tianjin University school of Physics and Microelectronics Zhengzhou University Department of Mechanical engineering Research Institute for Advanced Manufacturing The Hong Kong Polytechnic University Center of Electron Microscopy and state key laboratory of Silicon materials School of Materials Science and Engineering Zhejiang University key laboratory of Solidification Control and Digital Preparation Technology (Liaoning Province) School of Materials Science and Engineering Dalian University of Technology Institute of Advanced Wear & Corrosion Resistance and Functional materials Jinan University school of Mechanics and Civil engineering China University of Mining and Technology school of Physical sciences Great Bay University school of materials science andengineering Harbin Institute of Technology state key laboratory of materials-Oriented Chemical engineering College of Chemical Engineering Nanjing Tech University beijing Advanced Innovation Center for materials Genome engineering Research Institute for Carbon Neutrality University of Science and Technology Beijing Department of Mechanical engineering The University of Hong Kong school of Computing Macquarie University key laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province College of Physics and Optoelectronic Engineering Shenzhen University state key laboratory for Advanced Metals and materials University of Science and Technology Beijing state key laboratory of materials processing and Die & Mould Technology School of Materials Science and Engineering Huazhong University of Science and Technology Institute of materials Shanghai University Department of materials science and engineering C

Owing to their exceptional properties, high-entropy alloys(HEAs) and high-entropy materials have emerged as promising research areas and shown diverse applications. Here,the recent advances in the field are comprehensively reviewed,organized into five sections. The first section introduces the background of HEAs, covering their definition, significance,application prospects, basic properties, design principles, and microstructure. The subsequent section focuses on cutting-edge high-entropy structural materials, highlighting developments such as nanostructured alloys, grain boundary engineering,eutectic systems, cryogenic alloys, thin films, micro-nano-lattice structures, additive manufacturing, high entropy metallic glasses, nano-precipitate strengthened alloys, composition modulation, alloy fibers, and refractory systems. In the following section, the emphasis shifts to functional materials, exploring HEAs as catalysts, magneto-caloric materials, corrosion-resistant alloys, radiation-resistant alloys, hydrogen storage systems, and materials for biomedicine. Additionally, the review encompasses functional high-entropy materials outside the realm of alloys, including thermoelectric, quantum dots, nanooxide catalysts, energy storage materials, negative thermal expansion ceramics,and high-entropy wave absorption materials. The paper concludes with an outlook, discussing future directions and potential growth areas in the field. Through this comprehensive review,researchers, engineers, and scientists may gain valuable insights into the recent progress and opportunities for further exploration in the exciting domains of high-entropy alloys and functional materials.

关键词： Cutting-edge structural materials Cutting-edgefunctional materials High entropy alloys

Introducing hydroxyl groups to tailor the d-band center of Ir atom through side anchoring for boosted ORR and HER

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Journal of Energy Chemistry 2024年第3期90卷 144-151,I0005页

作者： Qing Lv Meiping Li xiaodong Li xingru yan Zhufeng Hou Changshui Huang science Center for material Creation and Energy Conversion School of Chemistry and Chemical EngineeringInstitute of Frontier and Interdisciplinary ScienceShandong UniversityJinan 250100ShandongChina Institute of Chemistry Chinese Academy of ScienceBeijing 100191China state key laboratory of Structural Chemistry Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002FujianChina

Tuning the coordination atoms of central metal is an effective means to improve the electrocatalytic activity of atomic ***,iridium(Ir) is proposed to be asymmetrically anchored by sp-N and pyridinic N of hydrogen-substituted graphdiyne(HsGDY),and coordinated with OH as an Ir atomic catalyst(Ir_(1)-N-HsGDY).The electron structures,especially the d-band center of Ir atom,are optimized by these specific coordination ***,the as-synthesized Ir_(1)-N-HsGDY exhibits excellent electrocatalytic performances for oxygen reduction and hydrogen evolution reactions in both acidic and alkaline *** from the unique structure of HsGDY,IrN_(2)(OH)_(3) has been developed and demonstrated to act as the active site in these electrochemical *** those indicate the fresh role of the sp-N in graphdiyne in producing a new anchor way and contributing to promote the electrocatalytic activity,showing a new strategy to design novel electrochemical catalysts.

关键词： Oxygen reduction reaction D-band center Graphdiyne Hydroxyl group Electrocatalysis

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Introducing Covalent Metal-Phosphorus Bonds into Intermetallic Platinum-Based Catalysts for High-Performance Fuel Cells

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Renewables 2024年第4期2卷 223-232页

作者： Yiping Li Jiashun Liang Zijie Lin xuan Liu Shenzhou Li xiaoyu yan zhao Cai Jiantao Han Yupei zhao Tanyuan Wang Qing Li state key laboratory of material processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhanHubei 430074 Faculty of materials science and Chemistry China University of Geosciences(Wuhan)WuhanHubei 430074 school of Petrochemical engineering Changzhou UniversityChangzhouJiangsu 213164

The inadequate performance of oxygen reduction reaction(ORR)catalysts hampers the development of proton exchange membrane fuel cells(PEMFCs).Herein,we proposed an approach to tackle this problem by modulating the chemical bond type of intermetallic Pt-based catalysts,using phosphorus(P)doped L1_(0)-PtFeGa_(0.1)/C(P-L1_(0)-PtFeGa_(0.1)/C)as a proof of concept.X-ray absorption spectroscopy(XAS)demonstrated that the doped P transferred electrons to Pt,and thus,modified the electronic structure of Pt,weakening the adsorption strength with oxygen-containing *** P-L1_(0)-PtFeGa_(0.1)/C showed 13 times mass activity(MA)compared with commercial Pt/C,with a decay of only 28%after 100,000 potential *** equipped in the membrane electrode assembly,the P-L1_(0)-PtFeGa_(0.1)/C catalyst also exhibited a remarkable activity(MA=0.84 A mgPt^(−1)at 0.9 V)and stability(MA retention=72%and voltage loss=9 mVat 0.8 A cm^(−2)after 30,000 cycles),making it one of the best performers among recorded Pt-based *** studies demonstrated that the doping of P optimized the adsorption energy between Pt and oxygen intermediates through sp-d orbital interactions and prevented metal dissolution by forming stronger Pt-P covalent bonds compared with Pt–Pt bonds.

关键词： proton exchange membrane fuel cell oxygen reduction reaction intermetallic compounds phosphorus doping covalent bond