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Local structural origin of relaxor antiferroelectric behavior in NaNbO3-based ceramics

Chemical Engineering Journal 2025年 514卷

作者： Meng, Xiangyu Yuan, Liran Li, Dongxu Wang, Pengbin Guo, Qinghu Gan, Xiaoyan Yao, Zhonghua Liu, Hanxing Wu, Jinsong Zhang, Shujun Hao, Hua State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China National Energy Key Laboratory for New Hydrogen-Ammonia Energy Technologies Foshan Xianhu Laboratory Foshan528200 China Nanostructure Research Center Wuhan University of Technology Wuhan430070 China Institute for Superconducting and Electronic Materials Faculty of Engineering and Information Sciences University of Wollongong WollongongNSW2500 Australia

Relaxor-antiferroelectrics (relaxor-AFEs), known for their double polarization–electric field (P-E) hysteresis loops and relaxor characteristics, exhibit outstanding energy storage performance compared to other dielectric materials. However, the origins of their antiferroelectric-like behavior and relaxor features remain unclear due to their complex local structure. In this study, we designed relaxor-AFEs with a high degree of relaxor component and stable antiferroelectric behavior. The recoverable energy density (Wrec) of up to 4.6J/cm3 and energy efficiency of ∼ 79 % were achieved in a 0.76NaNbO3-0.16Na0.5Bi0.5TiO3-0.08CaTiO3 ceramic, demonstrating excellent thermal and frequency stability. The multiphase local polarization configuration was confirmed by atomic-resolution annular dark-field scanning transmission electron microscopy (ADF STEM). Additionally, integrated differential phase contrast (iDPC) images revealed an enhanced antiferrodistortion (AFD) induced by incorporating component with low tolerance factor, contributing to stable antiferroelectric behavior. The relationship between chemical heterogeneity, polarization configuration and energy storage performance was systematically established. This work provides insights into the structure origin and underlying mechanisms for relaxor-AFE performance, with potential implications to guide the development of advanced energy-storage dielectric materials. © 2025 Elsevier B.V.

关键词： Antiferroelectric materials

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Beating stripe solitons arising from helicoidal spin-orbit coupling in Bose-Einstein condensates

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Physical Review E 2025年第4期111卷 044203-044203页

作者： Cui-Cui Ding Qin Zhou B. A. Malomed Research Group of Nonlinear Optical Science and Technology Research Center of Nonlinear Science School of Mathematical and Physical Sciences Wuhan Textile University Wuhan 430200 China State Key Laboratory of New Textile Materials and Advanced Processing Wuhan Textile University Wuhan 430200 China Department of Physical Electronics School of Electrical Engineering Faculty of Engineering and the Center for Light-Matter University Tel Aviv University Tel Aviv Israel Instituto de Alta Investigación Universidad de Tarapacá Casilla 7D Arica Chile

We demonstrate that the model of a spatially nonuniform two-component Bose-Einstein condensates (BEC) featuring the helicoidal spin-orbit coupling (SOC), gives rise to dark-bright soliton complexes characterized by spatiotemporal periodic oscillations in each component. These solitons are formed by the superposition of dark and bright ones, and exhibit a beating state over time and a striped state across space, earning them the designation of beating stripe solitons. Our analysis demonstrates that helicoidal SOC significantly affects the formation and dynamical properties of these solitons, also serving as the primary driver for spin oscillations. Through the nonlinear superposition of the beating stripe solitons, a range of intricate scenarios of the interaction between multiple solitons emerges, including head-on collisions, bound states, and parallel states.

关键词： Solitons

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Rational design of TA/rGO/CNFs aerogel films as self-supporting cathodes for high-performance zinc-ion hybrid capacitors

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Journal of Energy Storage 2025年 125卷

作者： Yu, Xiuwen Liu, Qifan Shi, Shuangyu Zang, Limin Qiu, Jianhui He, Minhua Yang, Chao MOE Key Laboratory of New Processing Technology for Nonferrous Metal & Materials Guangxi Key Laboratory of Optical and Electronic Materials and Devices Guangxi Colleges and Universities Key Laboratory of Natural and Biomedical Polymer Materials Guilin University of Technology Guilin541004 China Guangxi Key Laboratory of Advanced Structural Materials and Carbon Neutralization Guangxi Minzu University Nanning530006 China Department of Machine Intelligence and Systems Engineering Faculty of Systems Science and Technology Akita Prefectural University Yurihonjo015-0055 Japan Guangxi Huazheng New Energy Technology Co. Ltd. Chongzuo532299 China

Wearable flexible electronic devices have been developed rapidly driven by their distinctive characteristics, such as portability, flexibility, comfort, and diverse forms. However, the accelerated pace of technological advancement leads to a considerable increase in non-biodegradable electronic waste, which has a detrimental impact on the natural environment. In this study, flexible aerogel films consisting of tannic acid (TA), reduced graphene oxide (rGO) and cellulose nanofibers (CNFs) were prepared through a simultaneous hydrothermal reduction and self-assembly strategy. As a natural polyphenol, TA can serve as a reducing agent for GO and provide extra capacity owing to its catechol and pyrogallol units. CNFs with large length-to-diameter ratio and oxygen groups can effectively prevent rGO restacking and promote electrolyte penetration. The flexible zinc-ion hybrid capacitors based on the aerogel film cathode and zinc foil anode have excellent electrochemical properties and flexibility. In light of environmentally friendly components, green preparation processes and superior electrochemical performance, this research can pave the way for further development of environmentally friendly aerogel film electrodes for high-performance wearable electronics. © 2025 Elsevier Ltd

关键词： Cellulose films

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Reasonable design of high-capacity MnO2/MXene/CF flexible cathodes for quasi-solid-state aqueous zinc-ion batteries

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Journal of Alloys and Compounds 2025年 1031卷

作者： Pang, Xinyu Liu, Qifan Li, Maokun Fan, Zhanhui Yang, Chao Qiu, Jianhui He, Minhua Zang, Limin MOE Key Laboratory of New Processing Technology for Nonferrous Metal and Materials Guangxi Key Laboratory of Optical and Electronic Materials and Devices Guangxi Colleges and Universities Key Laboratory of Natural and Biomedical Polymer Materials College of Materials Science and Engineering Guilin University of Technology Guilin541004 China Guangxi Key Laboratory of Advanced Structural Materials and Carbon Neutralization Guangxi Minzu University Nanning530006 China Department of Machine Intelligence and Systems Engineering Faculty of Systems Science and Technology Akita Prefectural University Yurihonjo015-0055 Japan Guangxi Huazheng New Energy Technology Co. Ltd. Chongzuo532299 China

Manganese-based aqueous zinc-ion batteries (AZIBs) have garnered growing interest in the area of adaptable and wearable devices because of their properties of simple manufacturing, superior safety, and ecological compatibility. Nevertheless, the actual implementation of Mn-based cathodes has faced challenges due to their inadequate conductivity and poor cycling performance. In this study, a chemical synthesis approach was employed to directly grow MnO2 on the surface and within the interlayer spaces of MXene. Subsequently, the composite was coated onto carbon felt (CF) using the impregnation method to fabricate binder-free MnO2/MXene/CF cathodes for AZIBs. The excellent conductivity and structural stability of MXene effectively enhance ion/electron transport kinetics and mitigate irreversible volume changes of MnO2 during charge and discharge processes. CF with excellent electrical conductivity and flexibility serves as an ideal current collector and substrate material for loading active materials. Moreover, its distinctive three-dimensional porous structure facilitates optimal interaction between the electrode material and the electrolyte. Consequently, the flexible quasi-solid-state AZIB, consisting of the optimized MnO2/MXene/CF cathode and zinc foil anode, exhibits high charge storage performance (a specific capacity of 429.1 mAh g−1 at 0.1 A g−1 and an excellent energy density of 343.2 Wh kg−1 at 79.9 W kg−1). Density functional theory analysis reveals that the incorporation of MXene enhances electron adsorption on MnO2 and significantly alters the density of states of MnO2, thus markedly improving its conductivity. These encouraging findings suggest that manganese-based materials hold great potential for application as cathodes in flexible quasi-solid-state AZIBs. © 2025 Elsevier B.V.

关键词： Carbon carbon composites

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Unsaturated cobalt single-atoms stabilized by silanol nests of zeolites for efficient propane dehydrogenation

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Chinese Journal of Catalysis 2025年第5期72卷 323-333页

作者： Liwen Guo Dao Shi Tianjun Zhang Yanhang Ma Guodong Qi Jun Xu Qiming Sun Innovation Center for Chemical Science College of ChemistryChemical Engineering and Materials ScienceJiangsu Key Laboratory of Advanced Negative Carbon TechnologiesSoochow UniversitySuzhou 215123JiangsuChina State Key Laboratory of New Pharmaceutical Preparations and Excipients College of Chemistry and Materials ScienceHebei UniversityBaoding 071002HebeiChina School of Physical Science and Technology&Shanghai Key Laboratory of High-resolution Electron Microscopy ShanghaiTech UniversityShanghai 201210China National Center for Magnetic Resonance in Wuhan State Key Laboratory Magnetic Resonance and Atomic Molecular PhysicsWuhan Institute of Physics and MathematicsInnovation Academy for Precision Measurement Science and TechnologyChinese Academy of SciencesWuhan 430071HuebiChina

Propane dehydrogenation(PDH)has emerged as a key on-purpose technology for the production of propylene,but it often depends on toxic chromium and expensive platinum catalysts,highlighting the need for environmentally friendly and cost-effective *** this study,we developed a facile impregnation method to fabricate unsaturated Co single-atoms with a tricoordinated Co_(1)O_(3)H_(x) structure by regulating silanol nests in purely siliceous Beta *** PDH catalytic tests and characterizations revealed a positive correlation between the presence of silanol nests and enhanced catalytic ***,the unsaturated Co single-atoms exhibited a carbon deposition rate more than an order of magnitude slower than that of Co ***,the optimized Co_(0.3%)/deAl-meso-Beta catalyst achieved a record-high propylene formation rate of 21.2 mmol_(C3H6) g_(cat)^(-1) h^(-1),with an exceptional propylene selectivity of 99.1%at 550℃.Moreover,the Co_(0.3%)/deAl-meso-Beta catalyst demonstrated excellent stability,with negligible deactivation after 5 consecutive regeneration *** study emphasizes the pivotal role of silanol nests of zeolites in stabilizing and modulating the coordination environment of metallic active sites,providing valuable insights for the design of high-activity,high-stability,and low-cost PDH catalysts.

关键词： Propane dehydrogenation Unsaturated cobalt Single-atoms Silanol nest Zeolite

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Synergistic engineering of phosphaphenanthrene and ionic liquids for unlocking flame retardant multifunctional epoxy resin with high performances

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Polymer Degradation and Stability 2025年 239卷

作者： Wang, Hao Wang, Yadong Gao, Jingjing Zhu, Zongmin Xiao, Fei College of Materials Science and Engineering Hubei Key Laboratory for New Textile Materials and Applications Wuhan Textile University Wuhan430200 China State Key Laboratory of Advanced Polymeric Materials College of Polymer Science and Engineering Sichuan University Chengdu610064 China School of Safety Science and Emergency Management Wuhan University of Technology Wuhan430070 China

Herein, we presented a multifunctional epoxy resin (EP) composite prepared by the synergistic combination of DOPO and ionic liquids (ILs). The optimized EP-DOPO/ILs system demonstrated exceptional flame retardancy, with only 3 wt% of flame retardant (DOPO/ILs) added to achieve UL-94 V-0 grade for EP and a limiting oxygen index (LOI) of 33.4 %. Cone calorimeter test revealed 32.2 % and 26.7 % reductions in peak of heat release rate (pHRR) and total smoke production (TSP), respectively, compared to neat EP. Notably, the designed rigid-flexible epoxy network simultaneously enhanced tensile strength to 75.7 MPa (+15.7 %) and impact strength to 24.8 kJ m-2 (+136.3 %), outperforming conventional EP thermosets. Furthermore, the EP composites retained 90 % visible light transmittance while exhibiting ultraviolet (UV) shielding efficiency and intrinsic fluorescence. This multi-component collaborative system provides an important experimental foundation for developing high-performance multifunctional polymeric materials. © 2025 Elsevier Ltd

关键词： Fire protection

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Pressure-controlled synergy between dehydrogenation and densification in TiH2 sintering

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Journal of the European Ceramic Society 2025年第14期45卷

作者： Hu, Tianxiao Lin, Mengting Zou, Ji Wang, Weimin Ji, Wei Fu, Zhengyi Hubei Longzhong Laboratory Wuhan University of Technology Xiangyang Demonstration Zone Xiangyang China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China

Titanium hydride (TiH2) ceramics have become key high-performance hydrogen storage materials. However, the sintering of TiH2 faces significant challenges due to the low temperature of dehydrogenation reaction (300–800 °C). In this study, high-pressure spark plasma sintering (HPSPS) technique was employed to successfully realize low-temperature high-density preparation by suppressing dehydrogenation and regulating densification kinetics under a high pressure (200 MPa). Under the optimized conditions (750 °C, 200 MPa, and 10 min), a fully dense single face-centered cubic (FCC) δ-Ti(H) phase bulk material was fabricated. The initial dehydrogenation temperature of samples fabricated by high-pressure spark plasma sintering (HPSPS) was higher than the dehydrogenation temperature of powder. Mechanistic analyses showed that high pressure inhibited hydrogen escape by compressing pores while promoting particle plastic flow and interfacial bonding. Increasing holding time from 5 to 10 min enhanced diffusion-dominated densification but exacerbated dehydrogenation-induced porosity under low-pressure conditions. The study shows that high pressure compaction can alleviate the contradiction between traditional high temperature densification and low temperature decomposition of TiH2, and offers a new strategy for the efficient densification of materials for low temperature decomposition. © 2025 Elsevier Ltd

关键词： Densification

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Low Pressure Chemical Vapor Deposited Perovskite Enables all Vacuum-Processed Monolithic Perovskite-Silicon Tandem Solar Cells

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advanced Energy materials 2025年

作者： Zhang, Yuxi Zhu, Yanqing Sun, Jingsong Hu, Min Chen, Jiahui Duan, Bingxin Hu, Shenghan Hou, Peiran Tan, Wen Liang Ku, Zhiliang Yang, Weiguang Lu, Jianfeng State Key Laboratory of Silicate Materials for Architectures Wuhan University of Technology Wuhan430070 China Zhejiang Baima Lake Laboratory Co. Ltd. Zhejiang Hangzhou310000 China School of Electronic and Electrical Engineering Hubei Province Engineering Research Center for Intelligent Micro-Nano Medical Equipment and Key Technologies Wuhan Textile University Wuhan430200 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China ClaytonVIC3168 Australia Solar Technology Co. Ltd. Jiangsu Taizhou225500 China

Low-pressure chemical vapor deposition (CVD) is a promising technique for metal halide perovskite photovoltaics fabrication due to its low manufacturing cost, conformal coverage, and high scalability for industry-scale fabrication. However, the lack of knowledge of the reaction kinetics makes the solar cell performance lag behind its solution-processed counterpart. Herein, the perovskite formation and crystal growth process in the CVD process are studied by unraveling the mechanism of ion diffusion via tracking the vapor–solid reaction with various semi-in-situ characterizations. It is found that Cs+ can migrate along the perovskite lattice and uniformly distribute in the vertical direction of the final perovskite film even changing the deposition order of CsBr and PbI2 in the solid source, whereas this order can significantly affect the growth kinetics and the bandgap of the perovskite. Depositing CsBr before PbI2 results in a faster conversion of inorganic precursors to perovskite phase, yielding a wider bandgap perovskite. Finally, we fabricated semi-transparent perovskite cells using all-vapor deposition process, which showed a champion efficiency of 18.7% and it retained ≈94% of its initial performance after 200 h of continuous operation. Moreover, using this all-vapor deposition process, we achieved a champion efficiency of 26.9% for monolithic perovskite-silicon tandem solar cells. © 2025 Wiley-VCH GmbH.

关键词： Low pressure chemical vapor deposition

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Effects of depth of discharge on the electrochemical performance of LiFePO4-graphite pouch cells

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Solid state Ionics 2025年 427卷

作者： Qiao, Xin Mu, Yahao Peng, Jian Pei, Bo Wang, Shuo Wuhan Institute of Marine Electric Propulsion Wuhan430064 China Center of Smart Materials and Devices State Key Laboratory of Advanced Technology for Materials Synthesis and Processing School of Material Science and Engineering Wuhan University of Technology Wuhan430070 China

Lithium iron phosphate-graphite (LFP-C) batteries are widely used in energy storage and electric vehicles due to their high safety and good cycling stability. However, there is still a lack of in-depth research to investigate the impact of depth of discharge (DOD) on LFP-C pouch cells. In this work, we systematically investigate the influence of DOD (2.5 V and 1.5 V) on the cycling performance of LFP-C pouch cells, and the evolution of the cathode–electrolyte interphase (CEI) and solid electrolyte interphase (SEI) layers. In comparison to a DOD of 2.5 V, the cell with a DOD of 1.5 V exhibits a rapid capacity degradation after 50 cycles. Combined with comprehensive characterizations, the mechanism of battery decay has been revealed. A deeper discharge to 1.5 V results in an increase in the disorder of graphite. Additionally, the organic components in the SEI layer decreases, while the Li2CO3, LiF, and Li3PO4 inorganic products enrich due to the continued decomposition of electrolyte. Meanwhile, the pouch cells generate a considerable quantity of H2 and minor CH4 gases. This study will pave the way to understand the effects of overdischarge on the electrochemical performance of commercial pouch cells and the evolution mechanism of CEI/SEI layers. © 2025 Elsevier B.V.

关键词： Battery Pack

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Structural regulation of TLCP and evaluation of its long-term heat resistance after solid-state polymerization

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Polymer Degradation and Stability 2025年 239卷

作者： He, Boang Ma, Ke Wan, Hai Wang, Ying Chen, Yuhan Liu, Wei Liang, Yuan Jin, Wenbin Huang, Shuohan He, Yong Wang, Yanping Xia, Yumin State Key Laboratory of Advanced Fiber Materials Key Laboratory of High Performance Fibers & Products Ministry of Education College of Materials Science and Engineering College of Physics Innovation Center for Textile Science and Technology Donghua University Shanghai201600 China

In this paper, a series of liquid crystal polyarylates were synthesized through a two-step method involving p-hydroxybenzoic acid (HBA), 4,4′-biphenyldiol (BP), terephthalic acid (TA), and isophthalic acid (IA). By adjusting the IA content (0–5 mol%), it was found that the introduction of IA significantly reduced the melting point (Tm) and crystallinity of the polyarylate while retaining its liquid crystallinity. When the IA content was 3 mol%, the polyarylate exhibited both optimized processability (Tm = 282.7 °C) and thermal stability (T5 % > 360 °C). The polymerization process was further optimized, and solid-state polymerization (SSP) was employed to increase the molecular weight. The results demonstrated that under solid-state polymerization conditions of either 270 °C for 6 h or 280 °C for 3 h, the polyarylate achieved a tensile strength exceeding 100 MPa and a softening temperature above 300 °C. Using the stepwise isothermal method (SIM), the long-term performance of the polyarylate at elevated temperatures was predicted. The solid-state polymerized polyarylate showed a significant reduction in strain under a constant stress at 170 °C over 10 years, confirming its long-term thermal stability. This study provides a novel strategy for the structural design and performance optimization of high-temperature-resistant engineering plastics. © 2025 Elsevier Ltd

关键词： High temperature engineering

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