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Low-Temperature Carbonized Nitrogen-Doped Hard Carbon Nanofiber Toward High-Performance Sodium-Ion Capacitors

Energy & Environmental Materials 2023年第4期6卷 129-136页

作者： Congkai Sun Xiong Zhang Yabin An Chen Li Lei Wang Xiaohu Zhang Xianzhong Sun Kai Wang Haitao Zhang Yanwei Ma Institute of Electrical Engineering Chinese Academy of SciencesBeijing 100190China School of Engineering Sciences University of Chinese Academy of SciencesBeijing 100049China State Key Laboratory of Separation Membranes and Membrane Processes Tianjin Key Laboratory of Advanced Fibers and Energy StorageSchool of Material Science and EngineeringTiangong UniversityTianjin 300387China Institute of Electrical Engineering and Advanced Electromagnetic Drive Technology Qilu ZhongkeJinan 250013China Key Laboratory of Advanced Technologies of Materials Ministry of EducationSchool of Materials Science and EngineeringSouthwest Jiaotong UniversityChengdu 610031China School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450001China

Carbon nanofiber(CNF)was widely utilized in the field of electrochemical energy storage due to its superiority of conductivity and ***,CNF was generally prepared at relatively high ***,nitrogen-doped hard carbon nanofibers(NHCNFs)were prepared by a lowtemperature carbonization treatment assisted with electrospinning *** functional theory analysis elucidates the incorporation of nitrogen heteroatoms with various chemical states into carbon matrix would significantly alter the total electronic configurations,leading to the robust adsorption and efficient diffusion of Na atoms on electrode *** obtained material carbonized at 600°C(NHCNF-600)presented a reversible specific capacity of 191.0 mAh g^(−1)and no capacity decay after 200 cycles at 1 A g^(−1).It was found that the sodium-intercalated degree had a correlation with the electrochemical impedance.A sodium-intercalated potential of 0.2 V was adopted to lower the electrochemical *** constructed sodium-ion capacitor with activated carbon cathode and presodiated NHCNF-600 anode can present an energy power density of 82.1 Wh kg^(−1)and a power density of 7.0 kW kg^(−1).

关键词： electrochemical presodiation low-temperature carbonization nitrogen-doped hard carbon nanofibers sodium-ion capacitors

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Correlation Analysis of Altitude and Lightning Trip Rate Based on R Language 1

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18th Annual Conference of China Electrotechnical Society, ACCES 2023

作者： Cheng, Luqing Zhang, Dandan Wan, Zhiyu Hou, Guobin School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430074 China Key Laboratory of Pulsed Power Technology Ministry of Education Huazhong University of Science and Technology Wuhan430074 China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan430074 China

ISBN: (数字)9789819713516

ISBN: (纸本)9789819713509

To explore the relationship between altitude and lightning trip rate, this paper uses R language to study the monitoring data of lightning positioning system in a certain area from 2012 to 2022. The changes in altitude and lightning trip rate of different voltage levels in this area were analyzed, and the correlation between the two was visually displayed. On the basis of correlation analysis, a regression model of the two is established, and the univariate linear mathematical relationship expression of altitude and lightning trip rate is obtained. The results show that there is a strong positive correlation between altitude and lightning trip rate, and the fitting effect of the regression analysis model is better, which provides an important basis for further research on lightning-related problems and provides a reference for the improvement and optimization of lightning information system. © Beijing Paike Culture Commu. Co., Ltd. 2024.

关键词： Lightning

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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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MIDC system voltage support capability evaluation index with renewable energy sources

MIDC system voltage support capability evaluation index with...

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2024 International Conference on Energy technology and Electrical Power, ETEP 2024

作者： Huang, Qiyuan Wu, Jinbo State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China State Grid Hunan Electric Power Co. Ltd. Power Research Institute China

ISBN: (纸本)9781510690400

Renewable energy sources (RES) connected to the receiving end of the multi-infeed HVDC (MIDC) system will affect the node voltage support capability, which in turn affects the voltage stability of the power grid. To reasonably evaluate the voltage support capability of RES integrated MIDC systems, firstly, the structural characteristics of the MIDC system and the amplitude and phase characteristics of different types of RES are analyzed. Secondly, based on the traditional short circuit ratio index combined with the RES amplitude and phase characteristics, the multi-infeed transient short circuit ratio (MITSCR) is defined, and the method of analyzing the voltage support capability of MIDC system is proposed. Finally, time-domain simulation analysis is carried out using PSACD/EMTDC, and the results show that the MITSCR can effectively characterize the node voltage support capability. © 2025 SPIE.

关键词： Solar fuels

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Influence of Phase Angle for Low-order Harmonics on Vibration of an Induction Traction Motor 5

Influence of Phase Angle for Low-order Harmonics on Vibratio...

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5th IEEE International Electrical and Energy Conference, CIEEC 2022

作者： Kou, Yangbo Xiong, Fei Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan430074 China

ISBN: (数字)9781665411042

ISBN: (纸本)9781665411042

The vibration and noise problem of induction traction motor has been widely concerned and studied in recent years. This paper focuses on the influence of low-order harmonics phase on electromagnetic force of induction motor. Firstly, the relationship between stator and rotor current phase with harmonics is analyzed qualitatively by equivalent circuit. Then, the electromagnetic force of an induction traction motor is studied. Using two-dimensional Fourier analysis, the main spatial order and frequency of electromagnetic force wave can be calculated. The variation of three main electromagnetic force waves with harmonic phases are analyzed. Finally, the vibration under different harmonic phases is obtained by finite element simulation. The results show that the relationship between electromagnetic force and motor vibration with harmonic phase is basically consistent under low spatial order. © 2022 IEEE.

关键词： Induction motors

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Average-Value Modeling of a Capacitor Charge Power Supply with Homopolar Inductor Alternator 3

Average-Value Modeling of a Capacitor Charge Power Supply wi...

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

作者： Yi, Zhengkang Yu, Kexun Lai, Houchuan Guo, Songlin Xie, Xianfei Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan430074 China

ISBN: (数字)9781665477321

ISBN: (纸本)9781665477321

Homopolar inductor alternator (HIA) has the advantages of high energy storage density, high reliability, and high rotor strength, and is widely used in inertial energy storage capacitor charging power supply (CCPS). For the pulse alternator capacitor charging system, it is very important to study the charging transient process and explore the influence of various parameters on the charging performance. The current research method is difficult to take the simulation speed and simulation accuracy into account. In this paper, an average-value model modeling method for alternator rectifier systems with large capacitive loads is proposed. After that the HIA-CCPS platform is developed and experiments are carried out. The experimental results are basically consistent with the simulation results of the average-value model, which verifies the accuracy of the average-value model. Finally, the relationship between the average-value model and the VBR (voltage-behind-reactance) model is discussed. © 2022 IEEE.

关键词： Electric inductors

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Optimization Scheduling Strategy for Microgrids with Orderly EV Charging Based on Information-Gap Decision Theory 5

Optimization Scheduling Strategy for Microgrids with Orderly...

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5th International Conference on Power engineering, ICPE 2024

作者： Yang, Dongjunming Xiong, Xinrui Ma, Rui Lou, Suhua Wang, Guanzhen Lin, Zheng Power Grid Planning & Research Center Guizhou Power Grid Co. Ltd Guiyang China Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (纸本)9798331531140

As renewable energy rapidly develops, microgrids have gradually become an essential part of modern power systems. Microgrids integrate distributed generation, energy storage systems, and loads, improving energy utilization efficiency and offering strong resilience against disturbances. Electric vehicles (EVs), as a form of energy storage for renewable energy, have a significant impact on the operation of microgrids through their charging behavior. Proper scheduling of EV charging can not only reduce the operating costs of the microgrid but also balance loads and enhance renewable energy absorption. However, the uncertainty in DG output poses challenges to microgrid scheduling. The Information-Gap Decision Theory (IGDT) is an approach used to solve optimization problems involving uncertainty. Compared to traditional methods for handling uncertainty, such as stochastic programming, fuzzy programming, and interval robust optimization, IGDT has the advantage of not requiring precise probability distributions or uncertainty intervals for uncertain parameters. This paper proposes an optimization scheduling strategy for microgrids with orderly charging of EVs based on IGDT, analyzing the uncertainty of DG output. First, a model of EV travel characteristics and an orderly charging scheduling model are established. Then, a robust optimization model based on IGDT is constructed. The objective is to minimize the total operating cost of the microgrid. © 2024 IEEE.

关键词： Stochastic programming

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Development of the pellet injection system on the J-TEXT tokamak

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Plasma Science and technology 2022年第9期24卷 127-133页

作者： Yingzhou JIANG Zhongyong CHEN You LI Wei YAN A LUKIN I VINYAR Feng LI Xin XU Zhipeng CHEN Zhoujun YANG Nengchao WANG Yonghua DING Yuan PAN the J-TEXT Team 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 430074People’s Republic of China PELIN LLC Saint-Petersburg 190031Russia

Pellet injection is an attractive technology for core-fueling and magnetohydrodynamic study in magnetic-conflnement fusion devices like tokamaks and *** can inject solid hydrogen/deuterium pellets into the plasma with deeper density deposition compared with other fueling methods,such as gas pufflng.A three-barrel H_(2)pellet injection system was installed on the J-TEXT tokamak and experiments were carried *** pellets are formed in three barrels cooled by a cryocooler and compressor system at around 9 K,and are 0.8 mm/1 mm diameter and 0.8 mm *** pellet is launched by helium propellant gas and injected from the lowfleld side of the *** normal range of pellet speed is 210–310 m s^(-1)for different propellant gas *** to the three-barrel structure,the number of injected pellets can be adjusted between one and *** can be launched sequentially with arbitrary time intervals,which enables flexible *** results of the experiments show that pellet fueling efflciency can reach 50%.The energy conflnement time increased by about 7.5–10 ms after pellet injection.

关键词： J-TEXT pellet injection system pellet fueling

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The electromagnetic gyrokinetic simulations of ITG and TEM instability in finite-β tokamak plasmas 50

The electromagnetic gyrokinetic simulations of ITG and TEM i...

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50th EPS Conference on Plasma Physics, EPS 2024

作者： Zhang, Guodong You, Jinxiang Wang, Zihao Wang, Lu Wang, Shaojie International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics State Key Laboratory of Advanced Electromagnetic Technology Huazhong University of Science and Technology China Department of Engineering and Applied Physics University of Science and Technology of China Hefei230023 China

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Disordered Rocksalts with Lattice Oxygen Activation as Efficient Oxygen Evolution Electrocatalysts

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Transactions of Tianjin University 2023年第4期29卷 304-312页

作者： Zhengli Huan Haipeng Fu Xuerong Zheng Huiming Ji School of Materials Science and Engineering Key Laboratory of Advanced Ceramics and Machining Technology of Ministry of EducationTianjin UniversityTianjin 300072China Key Laboratory of Electromagnetic Processing of Materials Ministry of EducationNortheastern UniversityShenyang 110819China State Key Laboratory of Marine Resource Utilization in South China Sea School of Materials Science and EngineeringHainan UniversityHaikou 570228China

The lattice oxygen oxidation mechanism(LOM)provides an efficient pathway for accelerating the oxygen evolution reaction(OER)in certain electrocatalysts by activating and involving lattice oxygen in the catalytic OER *** investigated the potential of disordered rocksalts as catalysts for accelerating the OER through the LOM process,leveraging their unique metastable Li-O-Li bond *** calculations were employed to predict the catalytic pathways and activities of disordered rocksalts(DRX),such as Li_(1.2)Co_(0.4)Ti_(0.5)O_(2)(LCTO).The results revealed that benefiting from the unhybridized Li-O electronic orbitals and the resulting metastable states of Li-O-Li bonds in DRX,LCTO exhibited a typical LOM pathway,and the lattice oxygen was easily activated and participated in the *** experimental results showed that LCTO exhibited a remarkable pH-dependent OER activity through the LOM pathway,with an overpotential of 241 mV at a current density of 10 mA/cm^(2),and excellent long-term *** work provides a novel chemical space for designing highly active and stable OER electrocatalysts by leveraging the LOM reaction pathway.

关键词： Lattice oxygen oxidation Disordered rocksalts Oxygen evolution reaction Electrocatalysts

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