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Mesoporous polymers:soft-template self-assembly synthesis and applications

Science China Chemistry 2024年第5期67卷 1442-1464页

作者： Facai Wei Tingting Zhang Jianwei Fu Chengbin Jing Jiangong Cheng Shaohua Liu State Key Laboratory of Precision Spectroscopy Engineering Research Center of Nanophotonics&Advanced Instrument(Ministry of Education)School of Physics and Electronic ScienceEast China Normal UniversityShanghai 200241China School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450052China State Key Lab of Transducer Technology Shanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai 200050China

Mesoporous polymers combine the advantages of polymer materials(abundant polar functional groups,lightweight,flexibility,and processability)and mesoporous structures(high specific surface area,adjustable pore structure,and large pore volume);hence,they have great application potential in sensing,adsorption,catalysis,energy storage,biomedicine,***,developing advanced synthetic strategies for mesoporous polymers and investigating their intrinsic applications have become hot research ***-template-based self-assembly is regarded as a promising approach for synthesizing mesoporous *** work reviews recent progress in the synthetic strategy for producing various mesoporous polymers using soft-template selfassembly,focusing on the synthesis of conductive polymers,phenol-based polymers,and resin-based polymers and their potential ***,perspectives on future applications of mesoporous polymers,along with a few challenges that need to be resolved,are also discussed in this review.

关键词： mesoporous polymer porous material self-assembly soft templates interface synthesis

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Emerging hierarchical mesoporous materials of covalent organic frameworks

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Science China Chemistry 2024年第9期67卷 2796-2802页

作者： Lingyan Huang Wenda Li Hongyi Zhang Shanzhe Ke Hao Chen Jianwei Fu Chengbin Jing Jiangong Cheng Shaohua Liu State Key Laboratory of Precision Spectroscopy/Engineering Research Center of Nanophotonics&Advanced Instrument(Ministry of Education) School of Physics and Electronic ScienceEast China Normal UniversityShanghai 200241China School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450052China State Key Lab of Transducer Technology Shanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai 200050China

Benefiting from abundant exposed active sites,minimized diffusion resistance of guest molecules,facilitated mass transfer process and enhanced storage capacity,covalent organic frameworks(COFs)have gained widespread scientific attention[1–4].Further construction of mesopores regarding pore engineering(pore size,pore geometry,pore volume,and framework compositions)in COFs can improve mass transport,accessibility as well as size-selectivity of the special guest moieties,thus exhibiting potential in catalysis,energy storage and separation and so on[5,6].

关键词： gained catalysis separation

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Data-Efficient Synchronous Machine Winding Short Circuit Faults Diagnosis Based on Frequency Response Analysis and Active Learning

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IEEE Sensors Journal 2025年第11期25卷 19804-19815页

作者： Chen, Yu Zhao, Zhongyong Liu, Jiangnan Wang, Wei Yao, Chenguo Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Technology School of Electrical and Electronic Engineering Wuhan430074 China Southwest University College of Engineering and Technology Chongqing400716 China Yibin Academy of Southwest University Sichuang64400 China Guangzhou Power Supply Bureau of Guangdong Power Grid Co. Ltd Guangzhou510620 China Chongqing University State Key Laboratory of Power Transmission Equipment and System Security and New Technology Chongqing400044 China

Winding short-circuit (SC) faults are a prevalent issue in synchronous machines, and the accurate and timely identification of these faults is critical for maintaining power system stability. Current methods for inspecting synchronous machine windings often rely on periodic inspections based on human expertise. Numerous studies have explored the application of deep learning (DL) models for detecting synchronous machine winding SC faults. However, these models often exhibit excessive complexity and overlook physical overhead, leading to inefficient utilization of computational power and data resources. To address these limitations, this study proposes a dual-channel deep learning (DL) model integrated with the active learning (AL) query strategy. In this study, winding SC faults are manually simulated on a 5 kVA synchronous machine, and corresponding frequency response analysis (FRA) data are recorded. Subsequently, the proposed method is validated on the test set and benchmarked against previous studies. Experimental results demonstrate that the proposed method significantly reduces the data annotation effort and accelerates model training to the order of seconds (under 5 seconds) while maintaining satisfactory accuracy (≥ 95%). Comparative experimental results further indicate that the proposed model, requiring only 1/20th of the labeled training samples used in previous studies, achieves a substantial reduction of approximately 99.8% in both model parameters and training time. © 2001-2012 IEEE.

关键词： Synchronous machinery

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Branching Behavior of Continuous Leaders in Positive laboratory Long Air Discharges 37

Branching Behavior of Continuous Leaders in Positive Laborat...

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37th International Conference on Lightning Protection, ICLP 2024

作者： Guo, Lili Wang, He He, Junjia Zhang, Zhi State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China Electric Power Research Institute State Grid Hubei Electric Power Co. Ltd. Wuhan China

ISBN: (纸本)9783800764174

An essential inquiry in long air discharge pertains to why the discharge channel generates extensive branches. Here we have studied the extensive optical measurements of continuous leader channel branching. An exploration into branching behaviours shows a tendency for positive leaders to bifurcate or trifurcate, with a preference for bifurcation. The findings notably reveal a decrease in branching frequency as the channel approaches the ground electrode. Moreover, over 80% of branching events occurred within a ±30°angle range in front of the high-voltage electrode before breakdown. Statistical analysis of 280 bifurcations identifies three distinct branching types, with Type I being the most common and Type II the least frequent. Type II exhibits the narrowest branching angle range and lowest average, while in Type I branching, the deflection angle distributions of the left and right branches are essentially similar. Finally, the variation noticed in the partial velocity of the primary leader is notably affected by the development of sub-branches. That is a process driven by the elongation and branching of stems ahead of the already thermalized channel. Due to the complexity of branching behaviours and the limited research findings, our understanding of positive polarity leader analysis remains incomplete. Questions such as why the branching occurs, the patterns of branching, and the factors leading to branching behaviours still require further exploration. Regarding the above issue, the article statistically analysed the branching behaviour of hundreds of positive polarity long gap discharges conducted in this study, focusing on aspects such as the number of branches, the locations of branching occurrences, and the morphological characteristics of branching. Furthermore, we analysed the impact of branching on the velocity of the main discharge channel. © 2024 IEEE, © VDE VERLAG GMBH ∙ Berlin ∙ Offenbach.

关键词： Robotics

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Electronic Structure of a Co-Doped ZnO 12 30)Σ=7 Grain Boundary 3

Electronic Structure of a Co-Doped ZnO 12 30)Σ=7 Grain Bou...

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3rd IEEE China International Youth Conference on Electrical engineering, CIYCEE 2022

作者： Zhang, Xiaoxuan He, Junjia Song, Li Zhou, Benzheng State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Hubei Wuhan430074 China State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430074 China

ISBN: (纸本)9781665477321

The electronic properties of Co-doped Σ=7[0001] grain boundaries in ZnO were investigated using first-principles calculations due to the important role of Co in ZnO varistor ceramics. Grain boundary segregation calculations show that for Σ=7 grain boundaries, the driving force of Co segregation at grain boundaries is strong, and the segregation energy of interstitial filling is lower than that of grain boundary substitution. We obtain negative segregation energies at the two grain boundary sites, indicating that Co aggregates at the grain boundaries. The analysis of the band structure, electronic density of states and plane-averaged charge density shows that the pure Σ=7 grain boundary will lead to the generation of shallow-level acceptor states due to the breaking of bonds at the grain boundary, but it will not cause nonlinear I-V characteristics. Calculations for doping Σ=7 grain boundaries show that Co produces local impurity states at the grain boundaries and acts as a donor dopant, the conduction band intersects with the Feimi level, enhancing the grain boundary conductivity. © 2022 IEEE.

关键词： Grain boundaries

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Schlieren techniques for observations of long positive sparks:Review and application

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High Voltage 2022年第5期7卷 825-839页

作者： Junjia He Xiankang Wang Xiangen Zhao Juhyeong Lee Yaping Du Xiaopeng Liu Quan Gan Yang Liu Yuqin Liao State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and TechnologyWuhanChina Department of Building Environment and Energy Engineering Hong Kong Polytechnic UniversityKowloonChina Department of Mechanical and Aerospace Engineering Utah State UniversityLoganUtahUSA

Understanding the mechanism of positive leader discharge is important in lightning protection engineering and the external insulation design in high voltage power transmission *** the propagation of a positive leader,some processes without light-emitting,for example,the insulation recovery process after the breakdown,cannot be observed by optical photography *** the combination of the digital high-speed imaging system,the conventional Schlieren techniques offer new vistas in the long air gap discharge *** important features of high spatial resolution,high sensitivity,and easy arrangement make Schlieren techniques powerful and effective tools for characterising the discharge processes without *** work presents a brief review of current Schlieren techniques and discusses the design of the Schlieren optics system for long spark *** interesting phenomena discovered at different phases of long sparks with high-speed Schlieren techniques are also presented.

关键词： insulation system positive

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Dense carbon nanofiber self-supporting electrode fabricated by orientation/compaction strategy for high volumetric lithium storage capacity

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Progress in Natural Science:Materials International 2025年第1期35卷 229-237页

作者： Haihui Liu Chaoqun Chen Qiang Xu Yan Song Xiangwu Zhang Chang Ma Tianjin Municipal Key Lab of Advanced Fiber and Energy Storage Technology Tiangong University CAS Key Laboratory of Carbon Materials Institute of Coal Chemistry Chinese Academy of Sciences Fiber and Polymer Science Program Department of Textile Engineering Chemistry and Science Wilson College of Textiles North Carolina State University

Low bulk density greatly restricts the large-scale application of electrospun carbon-based fiber membrane as electrode in energy storage devices. To solve the above challenges, herein an orientation-compaction densification strategy is proposed to enhance the bulk density and volumetric capacity of PAN-based carbon nanofiber membranes as self-supporting electrode used in lithium-ion batteries（LIBs）. Specifically, highly-oriented fibers are achieved by high-speed roller collecting during electrospinning, and compaction densification is conducted by hot-pressing treatment. The effects of collecting speed and hot-pressing pressure on the morphology, conductivity,bulk density, tensile strength, and flexibility of the obtained carbon nanofiber membrane are *** to conventional fiber membranes, of which fibers are disorderly stacked, the oriented fiber membrane is much easier to achieve dense stacking by compaction. The obtained dense carbon nanofiber membrane demonstrates a bulk density of 0.566 g cm-3, and shows a significantly-enhanced volumetric capacity(318.3 mA h cm-3), high-rate performance(86.6 mA h cm-3at 5 A g-1), and satisfactory cycling stability when used as selfsupporting electrode of LIBs.

关键词： Bulk density Densification Electrospinning Orientation-compaction Volumetric capacity

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Fluorobenzene diluted low-density electrolyte for high-energy density and high-performance lithium-sulfur batteries

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Journal of Energy Chemistry 2022年第5期31卷 752-761页

作者： Zhilong Han Shuping Li Mengjun Sun Renjie He Wei Zhong Chuang Yu Shijie Cheng Jia Xie State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074HubeiChina School of Physics Huazhong University of Science and TechnologyWuhan 430074HubeiChina State Key Laboratory of Materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074HubeiChina

The mass fraction of electrolytes is the crucial factor affecting the energy density of lithium-sulfur(Li-S)batteries. Due to the high porosity within the C/S cathode, high concentration of polysulfides, and side reaction in lithiun metal anode under lean electrolyte, it is extremely challenging to improve performance while reducing the electrolyte volume. Here, we report a novel electrolyte with relatively low density(1.16 g cm^(-2)), low viscosity(1.84 m Pa s), and high ionic conductivity, which significantly promotes energy density and cyclability of Li-S batteries under practical conditions. Moreover, such electrolyte enables a hybrid cathode electrolyte interphase(CEI) and solid electrolyte interface(SEI) layer with plentiful Li F, which leads to fast kinetics of ions transport and stable cyclability even under low *** to Li-S batteries in electrolyte employing 1,1,2,2-tetrafluoroethyl 2,2,3,3-tetrafluoropropyl ether(TTE) diluent, the ultra-thick cathode(20 mg cm^(-2)) shows a high capacity of 9.48 m Ah cm^(-2)and excellent capacity retention of 80.3% over 191 cycles at a low electrolyte-to-sulfur ratio(E/S = 2) and negative-to-positive capacity ratio(N/P = 2.5), realizing a 19.2% improvement in energy density in coin cells(from 370 to 441 Wh kg^(-1)) and a high energy density up to 467 Wh kg^(-1) in pouch cells. This study not only provides guidance for the electrolyte design but also paves the way for the development of high performance Li-S batteries under practical conditions.

关键词： High energy density Lithium-sulfur battery Thick sulfur electrode Lean electrolyte Low-density electrolyte

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Design of Power Supply for FRC Plasma Thruster Driven by Pulsed RMF

Design of Power Supply for FRC Plasma Thruster Driven by Pul...

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2024 IEEE China International Youth Conference on Electrical engineering, CIYCEE 2024

作者： Zhang, YiSong Yang, Yong Huang, Yuxuan Yi, Xiaopeng Lv, Chaofan Rao, Bo Lv, Fangwei Zhang, Ming School of Electrical and Electronic Engineering Huazhong University of Science and Technology International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics State Key Laboratory of Advanced Electromagnetic Technology Wuhan430074 China

ISBN: (纸本)9798331530174

The Field-reversed configuration (FRC) plasma thruster is a propulsion device driven by Pulsed Rotating magnetic field (RMF) to generate thrust. An FRC plasma thruster prototype has been built. The RMF antennas are designed with very high parameters namely a peak current of 4 kA, a resonant frequency of 150 kHz. Thus, a high voltage, high current pulsed power supply is required to satisfy the design. This article mainly presents the challenges and solutions in the design of the power supply system. First, 4 sets of power supplies are used to feed the RMF coils, which results in design parameters of 4 kA/3.5 kV for each power supply. Then, stray parameters control and loss analysis were done to improve power supply efficiency. Experimental tests are also performed on the system. In conclusion, the designed power supply system can satisfy the requirements of high operation parameters and high controllability. © 2024 IEEE.

关键词： Pulsed plasma thrusters

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A New Device Concept of Magnetic Confinement Deuterium-Deuterium Fusion

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Chinese Physics Letters 2023年第10期40卷 39-43页

作者：潘垣武松涛王之江陈志鹏许敏饶波朱平杨勇张明丁永华夏冬辉 International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics State Key Laboratory of Advanced Electromagnetic Engineering and TechnologySchool of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074China Institute of Plasma Physics Chinese Academy of SciencesHefei 230031China Southwestern Institute of Physics Chengdu 610041China

A two-stage cascade magnetic compression scheme based on field reversed configuration plasma is *** temperature and density of plasma before and after magnetic compression are *** addition,the suppression of the two-fluid effect and the finite Larmor radius effect on the tilting mode and the rotating mode of major magnetic hydrodynamic instability is studied,and finally,the key physical and engineering parameters of the deuterium-deuterium fusion pulse device are *** analysis shows that the fusion neutrons can be produced at an energy flux of more than 2 MW/m^(2)per year,which meets the material testing requirements for the fusion demonstration reactor(DEMO).If the recovery of magnetic field energy is taken into account,net energy outputs may be achieved,indicating that the scheme has a potential application prospect as a deuterium-deuterium pulse fusion energy.

关键词： scheme reversed rotating

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