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Inhomogeneous strain and doping of transferred CVD-grown graphene

Rare Metals 2022年第5期41卷 1727-1734页

作者： Yu-Ting Niu Fang-Zhu Qing Xue-Song Li Bo Peng National Engineering Research Center of Electromagnetic Radiation Control Materials University of Electronic Science and Technology of ChinaChengdu 611731China State Key Laboratory of Electronic Thin Films and Integrated Devices University of Electronic Science and Technology of ChinaChengdu 611731China School of Electronic Science and Engineering University of Electronic Science and Technology of ChinaChengdu 611731China Shenzhen Institute for Advanced Study University of Electronic Science and Technology of ChinaShenzhen 518110China

Chemical vapor deposition(CVD)-grown graphene on copper foils is subject to the Cu substrate, which affects the spatial distribution of strain and doping, thus influencing the electronic properties of graphene. However, plenty of electronic devices based on CVD-grown graphene require transfer process and the distribution of doping and strain in CVD-grown graphene transferred onto the insulating substrates remains elusive.

关键词： graphene transferred strain

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A strategy based on water soluble coal tar pitches to construct MnO_(2)@C composite materials with high electrochemical performance

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Science China(Technological Sciences) 2024年第1期67卷 311-320页

作者： LIU Bo WANG Kun GUO ZhaoQi HAN BeiBei XU GuiYing JU DongYing AN BaiGang LI YongCheng NI ZhenYong ZHOU WeiMin Key Laboratory of Energy Materials and Electrochemistry Research Liaoning Province University of Science and Technology LiaoningAnshan 114051China Advanced Science Research Laboratory Saitama Institute of TechnologyFusaiji 1690Japan Liaoning Starry Sky Sodium Battery Co. Ltd.Anshan 114051China Sinosteel Anshan Research Institute of Thermo-Energy Co. Ltd.Anshan 114051China State Key Laboratory of Marine Resource Utilization in South China Sea Hainan Provincial Key Lab of Fine ChemistrySchool of Chemical Engineering and TechnologyHainan UniversityHaikou 570228China Key Laboratory of Advanced Fuel Cells and Electrolyzers Technology of Zhejiang Province Ningbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo 315201China

The water soluble coal tar pitches(WS-CTPs)were successfully prepared and used to construct the MnO_(2)@C composite materials by a hydrothermal *** is interestingly observed that the structures and morphologies of MnO_(2)@C materials can be controlled by controlling the dosages of WS-CTPs and ***,it is aware that MnO_(2)exists in the MnO_(2)@C materials in an amorphous *** with MnO_(2),MnO_(2)@C materials output a remarkable improvement in electrochemical *** instance,MnO_(2)@C-0.3 shows the storage capacity at 965.7 mA h g^(−1)after 300 cycles at a current density of 0.1 A g^(−1).In addition,after 600 cycles at a current density of 1.0 A g^(−1),the storage capacity of MnO_(2)@C-0.3 still keeps 450.3 mA h g^(−1),indicating that MnO_(2)@C-0.3 owns tremendous cycle stability at a high current *** view of the fact that the coal tar pitches possess great cost advantages,the strategy of using WS-CTPs as a carbon source to cover the metal oxides is a competitive way to expand the application of metal oxides in the fabrication of electrodes of LIBs.

关键词： water soluble coal tar pitches MnO_(2) composite materials lithium ion batteries(LIBs) energy storage systems(ESSs) coal tar pitches

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Reactive power optimisation design and fault ride through of MMC-PLUS

Reactive power optimisation design and fault ride through of...

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6th International Conference on Renewable Power Generation

作者： Yang, Zhihan Xiang, Wang Yao, Liangzhong Wang, Zhibing Wen, Jinyu State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan Hubei Province430074 China China Electric Power Research Institute State Key Laboratory of Operation and Control of Renewable Energy and Storage Systems Beijing100192 China

To integrate bulk wind power, a modular multilevel converter (MMC)-PLUS composed of the series connection of line commutated converter (LCC) and MMC is investigated. The system combines the advantages of LCC and MMC, such as high power, high voltage, selfcommutating and direct current (DC) fault blocking capability. However, due to the coupled control of active power and reactive power, much reactive power should be compensated during the operation of LCC. The study makes a detailed analysis and optimisation of reactive power compensation devices taking into account the PQ operation curve of MMC and making full use of the capacity of MMC. In addition, further studies the control strategy of DC fault isolation and system restart under DC fault. The effectiveness of the reactive power configuration and DC fault strategy is verified by simulations in PSCAD/EMTDC. © 2017 Institution of engineering and technology. All rights reserved.

关键词： Reactive power

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Nanophase separated,grafted alternate copolymer styrene-maleic anhydride as an efficient room temperature solid state lithium ion conductor

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Chinese Chemical Letters 2024年第7期35卷 491-496页

作者： Qian Wang Ting Gao Xiwen Lu Hangchao Wang Minggui Xu Longtao Ren Zheng Chang Wen Liu Institute of Science and Technology China Three Gorges CorporationBeijing 100038China State Key Laboratory of Chemical Resource Engineering Beijing Advanced Innovation Center for Soft Matter Science and EngineeringCollege of ChemistryBeijing University of Chemical TechnologyBeijing 100029China

All solid-state lithium metal batteries(ASSLMBs)based on polymer solid electrolyte and lithium metal anode have attracted much attention due to their high energy density and intrinsic ***,the low ionic conductivity at room temperature and poor mechanical properties of the solid polymer electrolyte result in increased polarization and poor cycling stability of the Li metal *** order to improve the ionic conductivity at room temperature while maintaining mechanical strength,we combine the conductivity of short chain polyethylene oxide(PEO)and strength of styrene-maleic anhydride copolymer(SMA)to obtain a grafted block copolymer with nanophase separation structure,which has room temperature ionic conductivity up to 1.14×10^(-4)S/cm and tensile strength up to 1.4 ***||Li symmetric cell can work stably for more than 1500 h under the condition of 0.1 mA/cm^(2).Li||LiFePO_(4)full cells can deliver a high capacity of 151.4 mAh/g at 25℃and 0.2 C/0.2 C charge/discharge conditions,showing 85.6%capacity retention after 400 ***,the all solid state Li||LiFePO_(4)pouch cell shows excellent safety performance under different abuse *** results demonstrate that the nanophase separated,grafted alternate copolymer electrolyte has huge potential for application in Li metal batteries.

关键词： Solid polymer electrolyte All solid-state battery Li metal battery Copolymers Nanophase separation

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Optimal design of V-shaped interior PM synchronous machine with narrow rotor space for electric spindle

Optimal design of V-shaped interior PM synchronous machine w...

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International Conference on Electrical Machines and Systems (ICEMS)

作者： Chuan Qin Ronghai Qu Dawei Li State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology China

ISBN: (纸本)9781467388634

In recent years, high speed direct drive spindle motors are obtaining more and more attentions due to their compact structure, high efficiency, low vibration and noise. Compared with those of high speed machines used for electric vehicles (EV) and refrigerator compressors, the shaft of a spindle motor is always thicker to satisfy the mechanical support requirement. When the overall outer diameter of a spindle motor is further limited for practical use, the rotor space will be restricted on both the inner and outer side, which makes the machine design process a more challenging work. This paper presents a detailed design procedure of a high speed interior PM spindle permanent magnet (PM) motor. With large volume consumption for the shaft, the rotor space is fully utilized by adopting the inverted interior V shaped PM rotor structure. Firstly, the split ratio is optimized for maximum torque density. Then, the rotor parameters, including the magnet thickness, PM pole arc, angle between adjacent PMs and the bridge width are optimized by finite element analysis (FEA). The simulated results show significant improvement on output performance, i.e. the torque density is increased by 22%. Finally, the analysis results are verified by experimental tests on a 11 Nm, 12000RPM prototype machine.

关键词： Torque Rotors Permanent magnet motors Stators Synchronous motors Permanent magnets Harmonic analysis

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Isomeric π-Extension Strategy Enables Efficient Copper(I) Emitters with High Electroluminescence Efficiency

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advanced Optical Materials 2025年

作者： Ying, Ao Ai, Yuhan Chen, Xingyu Zhang, He Xia, Jianlong Gong, Shaolong College of Chemistry and Molecular Sciences Hubei Key Lab on Organic and Polymeric Optoelectronic Materials Wuhan University Wuhan 430072 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Center of Smart Materials and Devices School of Chemistry Chemical Engineering and Life Science Wuhan University of Technology Wuhan 430070 China

Luminescent copper(I) complexes are emerging as sustainable and cost-effective alternatives to conventional iridium(III) and platinum(II) phosphors in organic light-emitting diodes (OLEDs). However, achieving electroluminescence efficiencies comparable to those of noble metal-based emitters remains a formidable challenge. Here, an isomeric π-extension strategy is adopted to develop two new Cu(I) complexes, Cu-23BF and Cu-43BF, by precisely tuning the fusion site of a benzofuran subunit on a carbazole ligand within a carbene-metal-amide (CMA) motif. Compared to the prototype complex Cu-12BF, these new complexes exhibit more coplanar geometries, elongated molecular structures, and increased electron-hole separation in their excited states, resulting in near-unity photoluminescence quantum yields (up to 97%) and relatively high horizontal dipole ratios (up to 78%) in thin films. Notably, Cu-43BF delivers a short thermally activated delayed fluorescence lifetime of 0.65 µs and a fast radiative rate on the 10⁶ s⁻¹ order, attributed to its well-separated frontier molecular orbitals and favorable excited state ordering. As a result, the Cu-43BF-based OLED achieves a high external quantum efficiency of 29.4%, among the highest reported for Cu(I)-based OLEDs. This work not only provides a practical and effective strategy for designing highly efficient Cu(I) emitters but also highlights the future direction for Cu(I)-based OLEDs. © 2025 Wiley-VCH GmbH.

关键词： carbene-metal-amide copper(I) complex isomeric π-extension organic light-emitting diode

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Solid waste-derived porous ceramics: Unfired foaming preparation and high-temperature thermal and sound insulation

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Chemical engineering Journal 2025年 516卷

作者： Yabo Gao Yongxin Wang Aixin She Hang Li Huicong Lei Ling Zhang Haijun Zhang Zhong Huang Shaowei Zhang The State Key Laboratory of Advanced Refractories Wuhan University of Science and Technology Wuhan 430081 China College of Engineering Mathematics and Physical Sciences University of Exeter Exeter EX4 4QF UK Joint International Research Laboratory of Refractories and Metallurgy Wuhan University of Science and Technology Wuhan 430081 China

Industrial solid waste is a severe environmental issue of worldwide concern. Recycling it to prepare porous ceramics not only requires high-temperature treatment, but also suffers from the disadvantage of low porosity. In response to these, we proposed an unfired foaming route to prepare solid waste-derived porous ceramics (SW-PCs) with high porosity and hierarchical pore structure using steel slag, ore tailings, desulfurization ash and red mud as raw materials. The as-prepared steel slag porous ceramics had a porosity of 74.1 %, a thermal conductivity of 0.147 W/(m·K), and a compressive strength of 1.05 MPa and a noise reduction coefficient of 0.34. After heating at 1200 °C for 3 h, the as-prepared SW-PCs maintained their original pore structure with a linear shrinkage of only 1.73 %. Under 60 min firing by alcohol blowtorch (∼1101.8 °C) and butane torch (∼1302.5 °C), the SW-PCs showed no shrinkage or cracking, and the temperature differences between the fired and cold sides reached as high as 878.0 °C and 1017.8 °C, respectively. Our achievements including the recycling of solid waste and the development of unfired porous ceramics with high porosity, low thermal conductivity, superior sound absorption and high-temperature stability, render SW-PC a promising alternative for thermal and sound-insulation in buildings and industrial applications.

关键词： Sound insulation

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Mixed Three-Parameter Weibull Breakdown Distribution Model and Breakdown Mechanism of Metalized Films 1

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4th International Symposium on Insulation and Discharge Computation for Power Equipment, IDCOMPU 2023

作者： Lan, Jing Li, Hua Zhang, Guohao Lin, Fuchang Liu, Gang State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan Hubei430074 China Guangdong Guangzhou510080 China National Engineering Research Center of UHV Technology and Novel Electrical Equipment Basis Guangdong Guangzhou510080 China

ISBN: (数字)9789819974016

ISBN: (纸本)9789819974009

The breakdown characteristics of the metallized film significantly affect the reliability of self-healing capacitors. Traditional two-parameter Weibull distribution can be well described breakdown distribution of metallized film, but it is difficult to describe its early failure intuitively. Metallized film breakdown under low field strength has important influence on the reliability of the capacitor. In this paper, a mixed three-parameter Weibull distribution model is established to describe the breakdown characteristics and to analyze the mechanisms of metallized film. Metallized polypropylene films with different electrode thicknesses are chosen as the object to study the breakdown characteristics and mechanisms. The paper has shown there are three apparent breakdown peaks in the breakdown field strength of 400–500, 500–600 and 600–700 V/μm, which correspond early failure breakdown, low-field defects breakdown, near-intrinsic breakdown. The metallized film with electrode thickness d1 has been used as an example to state that three-parameter Weibull model can well describe different breakdown mechanisms. Moreover, the paper has shown that near-intrinsic breakdown is the main breakdown mechanism for metallized films. © 2024, Beijing Paike Culture Commu. Co., Ltd.

关键词： Failure (mechanical)

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Interface stability in a capillary loop undergoing phase changes in non-gravitational conditions

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Chinese Science Bulletin 2010年第35期55卷 4069-4073页

作者： TU ZhengKai LIU Wei LIU ZhiChun HUANG XiaoMing State Key Laboratory of Advanced Technology for Materials Synthesis and Progressing Wuhan University of Technology Wuhan 430070 China Key Laboratory of Fuel Cell Technology of Hubei Province Wuhan University of Technology Wuhan 430070 China College of Energy and Power Engineering Huazhong University of Science and Technology Wuhan 430074 China

A mathematical model based on the Lucas-Washburn equation has been developed to address the relationships between capillary height,capillary radius and heat flux in a capillary *** stability criteria at the interface are studied in detail by introducing a small perturbation to the interfaces of the capillary *** formulae deduced as a consequence are used to analyze the influence of height of the capillary wick and the stability in a capillary loop undergoing phase changes.

关键词：稳定性判据毛细血管相位变化循环界面 Washburn方程毛细管半径重力

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Strong electron–phonon coupling influences carrier transport and thermoelectric performances in group-IV/V elemental monolayers

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npj Computational Materials 2021年第1期7卷 1287-1298页

作者： Yu Wu Bowen Hou Ying Chen Jiang Cao Hezhu Shao Yiming Zhang Congcong Ma Heyuan Zhu Rongjun Zhang Hao Zhang Key Laboratory of Micro and Nano Photonic Structures(MOE)and Key Laboratory for Information Science of Electromagnetic Waves(MOE)and Department of Optical Science and Engineering School of Information Science and TechnologyFudan UniversityShanghaiChina Department of Light Sources and Illuminating Engineering School of Information Science and TechnologyFudan UniversityShanghaiChina School of Electronic and Optical Engineering Nanjing University of Science and TechnologyNanjingChina College of Electrical and Electronic Engineering Wenzhou UniversityWenzhouChina Yiwu Research Institute of Fudan University Yiwu CityZhejiangChina Nanjing University National Laboratory of Solid State MicrostructureNanjingChina

The interactions between electrons and phonons play the key role in determining the carrier transport properties in *** this work,comprehensive investigations on full electron–phonon(el–ph)couplings and their influences on carrier mobility and thermoelectric(TE)performances of 2D group IV and V elemental monolayers are performed,and we also analyze the selection rules on el–ph couplings using group *** shallow n/p-dopings in Si,Ge,and Sn,ZA/TA/LO phonon modes dominate the intervalley *** strong intervalley scatterings via ZA/TO phonon modes can be identified for CBM electrons in P,As,and Sb,and for VBM holes,ZA/TA phonon modes dominate intervalley scatterings in P while LA phonons dominate intravalley scatterings in As and *** considering full el–ph couplings,the TE performance for these two series of monolayers are predicted,which seriously downgrades the thermoelectric figures of merits compared with those predicted by the constant relaxation time approximation.

关键词： theory phonon coupling

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