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Enhanced energy storage performance of Mn-doped NBT-based flexible films by defect engineering

Journal of Alloys and Compounds 2025年 1010卷

作者： Ning, Lei Luo, Xia Sun, Ningning Li, Yong Han, Pei Li, Xiaowei Hao, Xihong Inner Mongolia Key Laboratory of Advanced Ceramic Material and Devices School of Materials Science and Engineering Inner Mongolia University of Science and Technology Baotou014010 China Ministry of Education Baotou014010 China Yunnan Key Laboratory of Electromagnetic Materials and Devices National Center for International Research on Photoelectric and Energy Materials School of Materials and Energy Yunnan University Kunming650091 China

The rapid development of advanced flexible electronics leads to higher demands on the energy storage performance and spatial adaptability of capacitors. Here, Mn2+ is doped into 0.6(Na0.5Bi0.5)TiO3-0.4Bi(Mg0.5Zr0.5)O3 (0.6NBT-0.4BMZ), which effectively reduces the carrier content by forming defective complexes through the bonding of Mn2+ with oxygen vacancies, while maintaining a relatively high polarizability and enhancing the breakdown strength. The optimal storage performance is demonstrated by the 0.6NBT-0.4BMZ film with a Mn doping amount of 1 mol%. The observed breakdown strength, storage density, and storage efficiency are 2900 kV/cm, 60.2 J/cm3, and 60.3 %, respectively. Furthermore, the films exhibit excellent stability in various temperature ranges (25–205 ℃), frequencies (1–5 kHz), fatigue tests (at 107 charge/discharge cycles), and bending resistance tests (20,000 cycles/radius R ≈ 2 mm). These results indicate that NBT-based film materials hold great promise for future flexible energy storage applications. © 2024

关键词： Fatigue testing

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Improved stability and electronic homogeneity in perovskite solar cells via a nanoengineered buried oxide interlayer

EES Solar

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EES Solar 2025年第2期1卷 115-128页

作者： W. Hashini K. Perera Tony J. Woodgate Dong Kuk Kim Rachel C. Kilbride Mateus G. Masteghin Christopher T. G. Smith Steven J. Hinder Sebastian Wood K. D. G. Imalka Jayawardena S. Ravi P. Silva Advanced Technology Institute School of Computer Science and Electronic Engineering University of Surrey Guildford Surrey GU2 7XH UK Electromagnetic and Electrochemical Technologies Department National Physical Laboratory Teddington Middlesex UK Department of Chemistry University of Sheffield Sheffield S3 7HF UK The Surface Analysis Laboratory Faculty of Engineering and Physical Sciences University of Surrey Guildford Surrey GU2 7XH UK

Self-assembled monolayers (SAMs) are a popular choice for achieving high-efficiency perovskite solar cells (PSCs). However, the incomplete wetting of the perovskite on (4-(3,6-dimethyl-9H-carbazol-9-yl)butyl)phosphonic acid (Me-4PACz) SAMs in PSCs has proven to be a challenge. Recently, the use of surface modifiers such as alumina nanoparticles and poly(9,9-bis(3′-(N,N-dimethyl)-N-ethylammonium-propyl-2,7-fluorene)-alt-2,7-(9,9-dioctylfluorene))dibromide (PFN–Br) has been demonstrated to eliminate this bottleneck. However, the influence of these surface modifiers on device stability has not been reported. Here, we studied the influence of alumina nanoparticles and PFN–Br on Me-4PACz device stability when stressed under ISOS-D-2I and ISOS-D-2 conditions (at 65 °C). The use of alumina nanoparticles leads to efficient scavenging of iodine, improved bulk electrical and surface electronic homogeneity in fresh films, which is preserved even when the films are degraded, and the formation of 2D perovskites, which act as a barrier against moisture induced degradation. In comparison, perovskites based on PFN–Br show a distinct lack of similar characteristics for fresh and degraded samples. This allows the realisation of alumina modified Me-4PACz based PSCs with a tenfold improved T80 lifetime of 1530 h under ISOS-D-2 conditions compared to the PFN–Br based device stack. Our study uncovers a new approach towards enhancing PSC stability, which could potentially be applied under more strenuous ISOS test conditions to further improve device stability.

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Photonic axion insulator

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Science (New York, N.Y.) 2025年第6730期387卷 162-166页

作者： Liu, Gui-Geng Mandal, Subhaskar Xi, Xiang Wang, Qiang Devescovi, Chiara Morales-Pérez, Antonio Wang, Ziyao Yang, Linyun Banerjee, Rimi Long, Yang Meng, Yan Zhou, Peiheng Gao, Zhen Chong, Yidong García-Etxarri, Aitzol Vergniory, Maia G. Zhang, Baile Division of Physics and Applied Physics School of Physical and Mathematical Sciences Nanyang Technological University Singapore Research Center for Industries of the Future Department of Electronic and Information Engineering School of Engineering Westlake University Hangzhou China School of Electrical Engineering and Intelligentization Dongguan University of Technology Dongguan China National Laboratory of Solid State Microstructures School of Physics Collaborative Innovation Center of Advanced Microstructures Nanjing University Nanjing China Donostia International Physics Center Donostia-San Sebastian Spain Institute for Theoretical Physics ETH Zurich Zurich Switzerland Material and Applied Physics Department University of the Basque Country (UPV/EHU) Donostia-San Sebastián Spain Department of Electronic and Electrical Engineering Southern University of Science and Technology Shenzhen China National Engineering Research Center of Electromagnetic Radiation Control Materials Key Laboratory of Multi-spectral Absorbing Materials and Structures of Ministry of Education University of Electronic Science and Technology of China Chengdu China State Key Laboratory of Optical Fiber and Cable Manufacture Technology Department of Electronic and Electrical Engineering Guangdong Key Laboratory of Integrated Optoelectronics Intellisense Southern University of Science and Technology Shenzhen China Centre for Disruptive Photonic Technologies Photonics Institute Nanyang Technological University Singapore IKERBASQUE Basque Foundation for Science Bilbao Spain Max Planck Institute for Chemical Physics of Solids Dresden Germany Département de Physique et Institut Quantique Université de Sherbrooke Sherbrooke Canada

Axions, hypothetical elementary particles that remain undetectable in nature, can arise as quasiparticles in three-dimensional crystals known as axion insulators. Previous implementations of axion insulators have largely been limited to two-dimensional systems, leaving their topological properties in three dimensions unexplored in experiment. Here, we realize an axion insulator in a three-dimensional photonic crystal and probe its topological properties. Demonstrated features include half-quantized Chern numbers on each surface that resembles a fractional Chern insulator, unidirectional chiral hinge states forming topological transport in three dimensions, and arithmetic operations between fractional and integer Chern numbers. Our work experimentally establishes the axion insulator as a three-dimensional topological phase of matter and enables chiral states to form complex, unidirectional three-dimensional networks through braiding.

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Enhanced dynamo drive for the sawtooth relaxation process due to non-uniform resistivity distribution in a reversed field pinch

arXiv

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arXiv 2025年

作者： Yan, Wentan Zhu, Ping Li, Hong Liu, Wandong Luo, Bing Li, Haolong KTX Laboratory Department of Plasma Physics and Fusion Engineering University of Science and Technology of China Anhui Hefei230026 China State Key Laboratory of Advanced Electromagnetic Engineering and Technology International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics School of Electrical and Electronic Engineering Huazhong University of Science and Technology Hubei Wuhan430074 China Department of Nuclear Engineering and Engineering Physics University of Wisconsin-Madison MadisonWI53706 United States Hunan Province Key Laboratory Integration and Optical Manufacturing Technology College of Mathematics and Physics Hunan University of Arts and Science Hunan Changde415000 China Department of Physics School of Science Tianjin University of Science and Technology Tianjin300457 China

In this work, we use the three-dimensional resistive MHD code NIMROD to investigate the impact of resistivity inhomogeneity on the sawtooth process of an reversed field pinch (RFP) plasma. The simulation employs a non-uniform resistivity profile similar to experiments, which monotonically increases from the core to the edge as the temperature decreases. The resistivity inhomogeneity introduces an additional electric field in the plasma, which accelerates the inward diffusion of magnetic flux and changing the self sustained reversal state, hence significantly enhances the dynamo effect and the sawtooth process in the RFP plasma. Copyright © 2025, The Authors. All rights reserved.

关键词： Electric fields

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New Current Control Method of DC Power Supply for Magnetic Perturbation Coils on J-TEXT

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Plasma Science and technology 2014年第11期16卷 1074-1078页

作者：曾武兵丁永华易斌许航宇饶波张明刘明海 State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology

In order to advance the research on suppressing tearing modes and driving plasma rotation, a DC power supply （PS） system has been developed for dynamic resonant magnetic perturbation （DRMP） coils and applied in the J-TEXT experiment. To enrich experimental phe- nomena in the J-TEXT tokamak, applying the circulating current four-quadrant operation mode in the DRMP DC PS system is proposed. By using the circulating current four-quadrant oper- ation, DRMP coils can be smoothly controlled without the dead-time when the current polarity reverses. Essential circuit analysis, control optimization and simulation of desired scenarios have been performed for normal current. Relevant simulation and test results are also presented.

关键词： DRMP power supply （PS） J-TEXT four-quadrant operation

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Equilibrium Reconstruction and Its Integration in J-TEXT

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Plasma Science and technology 2016年第7期18卷 786-790页

作者：张帆徐涛孙新锋张晓卿庄革简翔 State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology

The equilibrium fitting code （EFIT） and its application in the J-TEXT tokamak are integrated by the Matlab language. The function of analysis and visualization to the results is added. In addition, the experiment data measured by soft X-ray （SXR） are used to calculate plasma equilibrium as a constraint condition. The improved EFIT code is used for J-TEXT discharge and the profiles of plasma parameters such as flux function, safety factor q, pressure and current density are obtained from the reconstructed configurations.

关键词： EFIT integrated operation equilibrium reconstruction

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Plasma Response to Supersonic Molecular Beam Injection in J-TEXT

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Plasma Science and technology 2014年第1期16卷 17-20页

作者：肖金水杨州军庄革胡启明冯先德刘明海 State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology

Recently, hydrogen fueling experiments with supersonic molecular beam injection （SMBI） system have been performed in the J-TEXT tokamak. To evaluate the effects of the in- jection amount of SMBI on plasma behaviors, moderate and intensive SMBs have been separately injected and compared with each other in Ohmic discharges. With moderate SMBs, electron den- sity increases about twice as before, the size of magnetic island slightly decreases, and the edge toroidal rotation speed in a counter-current direction, measured by a high resolution spectrometer （Carbon V ion, 227.09 nm, r/a-= 0.7-0.8）, is accelerated from 8 km/s to 12 km/s. The state of higher electron density with moderate SMBI can be maintained for a long period, which indicates that plasma confinement is improved. However, with intensive SMBs, the accompanied magne- tohydrodynamic （MHD） activities are triggered, and the electron density increases moderately. The edge toroidal velocity is decreased, in certain cases even reversed in the co-current direction. The statistical result of experimental data for moderate and intensive SMBs suggests a preferred fueling amount （less than 3.2 ~ 1019） to improve the SMBI fueling efficiency in experiments.

关键词： SMBI fuelling plasma responses J-TEXT

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Optimization Study of Multiconductive Armature Structures Based on Asynchronous Induction Coil Launcher

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IEEE Transactions on Plasma Science 2025年

作者： Xie, Yi Cheng, Junsheng Wang, Qiuliang Xiong, Ling Zhu, Binyu School of Information Science and Technology University of Science and Technology of China Hefei290016 China Institute of Electrical Engineering Chinese Academy of Sciences Beijing100190 China Key Laboratory of High Density Electromagnetic Power and Systems Institute of Electrical Engineering Chinese Academy of Sciences Beijing100190 China Institute of Electrical Engineering and Advanced Electromagnetic Drive Technology Qilu Zhongke Jinan250101 China Institute of Electrical Engineering Chinese Academy of Sciences Beijing100190 China School of Information Science and Technology University of Science and Technology of China Hefei290016 China

The structure and weight ratio of the armature significantly affect the acceleration performance of electromagnetic coil launchers. This article presents a new type of armature structure, termed the multiconductive armature structure (MCAS), designed to enhance acceleration performance in asynchronous induction coil launchers. It analyzes the impact of the new armature structure on the propulsion performance of electromagnetic coil launchers. By establishing a mathematical model for the MCAS armature and designing the orthogonal experiment, the study investigates the effects of three parameters: the axial length of the circular rings located at the rear and front ends of the armature, and the distance between these two armatures, on the exit velocity and acceleration efficiency. The results indicate that the length of the rear armature ring has the most significant impact on the final propulsion performance, while the interactions among various factors influence the overall propulsion effect. And the experimental results demonstrate that the MCAS armature has a higher exit velocity, greater propulsion efficiency, and a lower armature weight ratio compared to conventional armatures. This novel armature structure provides a new design solution for asynchronous induction coil launchers. © 2025 IEEE All rights reserved.

关键词： electromagnetic propulsion

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Fretting wear mechanism of GH4169 dovetail joint specimens treated with hybrid laser shock peening

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Tribology International 2025年 209卷

作者： Fang, Xiuyang Wang, Zheng Wahab, Magd Abdel Gong, Jianen Liu, Xiong Liu, Xing Cai, Zhenbing School of Mechanical Engineering Southwest Jiaotong University Chengdu610031 China Tribology Research Institute Key Lab of Advanced Technologies of Materials Southwest Jiaotong University Chengdu610031 China Soete Laboratory Department of Electrical Energy Metals Mechanical Constructions and Systems Faculty of Engineering and Architecture Ghent University Gent9000 Belgium College of Engineering Yuan Ze University Taiwan China Parallel and Distributed Systems Laboratory Jožef Stefan Institute Jamova cesta 39 LjubljanaSI-1000 Slovenia DongFang Electric Machinery Co. LTD Deyang618000 China State Key Laboratory of Advanced Electromagnetic Technology Huazhong University of Science and Technology Hubei Wuhan430074 China

Aero engine blade structure is prone to severe fretting wear under centrifugal forces and vibration loads, resulting in greatly reduced engine service life, which is a typical fretting damage problem. In this paper, without Absorbing layer Nanosecond Laser Shock Peening (wAN-LSP) and without Absorbing layer Nanosecond superimposed Femtosecond hybrid Laser Shock Peening (NF-LSP) are utilized to strengthen the surface of GH4169 dovetail joint specimens, which is a common material for engine blades, to explore its strengthening mechanism and fretting wear evolution law. The findings indicate that the surface roughness of the wAN-LSP specimen rises from 0.28 μm to 1.16 μm. The thermal effects of wAN-LSP lead to the formation of a molten layer roughly 10.97 μm thick on the surface, accompanied by numerous pits, ablation holes, and micro-cracks. In contrast, NF-LSP treatment effectively eliminates the surface oxidation defects made by the thermal effects of wAN-LSP, leading to a slight decrease in surface roughness. Both wAN-LSP and NF-LSP treatments enhance the surface hardness of the specimens, creating a plastic deformation layer roughly 400 μm deep, but the near surface hardness of NF-LSP treated specimen is further improved compared to that of the wAN-LSP specimen. The wear mechanism observed in the GH4169 dovetail joint specimens following wAN-LSP and NF-LSP treatment are identified as abrasive wear and oxidation wear. Initially, as the number of cycles raises, the wear volume of GH4169 specimen treated with wAN-LSP is higher than that of untreated specimen, but subsequently, it becomes lesser than that of the untreated specimen. This phenomenon results from the interplay between the molten layer and hardened layer. In the initial stage of wear, despite the surface strengthening of the wAN-LSP specimen, the presence of molten layer significantly diminishes the fretting wear resistance of the material. As wear progresses, the molten layer is removed, revealing the be

关键词： Abrasion

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Optimization of the lattice function in the planar undulator applied for terahertz FEL oscillators

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Chinese Physics C 2014年第3期38卷 72-77页

作者：杨磊秦斌杨军刘遐龄谭萍胡桐宁 State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology

Since the beta function of the electron beam within the undulator has a great influence on the power gain of the free electron laser（FEL）,optimization of the undulator lattice becomes *** this paper,the transfer matrix of the planar undulator is obtained from differential equations of the electron *** on this,the lattice function of the planar undulator in a terahertz FEL oscillator proposed by Huazhong University of Science and technology（HUST-FEL） is optimized and the expressions of the average beta function are *** accuracy of the optimization result was confirmed well by the numerical *** application range of this analytical method is given as *** last,the emittance growth in the horizontal direction due to the attenuation of the magnetic field is discussed.

关键词： planar undulator beam transport lattice optimization

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