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The synthesis of carbon microspheres film composed of nano-onions and its application as flexible supercapacitors

Carbon Energy 2021年第3期3卷 509-518页

作者： Miao Zhang Naiqin Zhao Xifei Li Tianjin International Joint Research Centre of Surface Technology for Energy Storage Materials School of Physics and Materials ScienceTianjin Normal UniversityTianjinChina Tianjin Key Laboratory of Composite and Functional Materials School of Materials Science and EngineeringTianjin UniversityTianjinChina

Flexible electrodes with superior mechanical and electrochemical properties are essential for flexible supercapacitors.A convenient and scalable colloidal film-assisted chemical vapor deposition(CF-CVD)method is developed for the one-step fabrication of the carbon microspheres films composed of carbon nano-onions(CMS-CNO films).The influence of growth conditions(such as growth temperature,time,and gas ratio)during CF-CVD process on the carbon structures and the growth mechanism of the CMS-CNO films have been *** controlling the growth conditions,the controllable preparation of CMS-CNO films is *** binder-free films can be used for the assembly of flexible supercapacitors,and unique architecture can achieve excellent *** from the composite of nano-micro zero dimensional structures,the performance of the film in supercapacitors is remarkably *** the current density of 5 mA cm^(-2),the area-specific capacity can be 903 mF cm^(-2).When the current density is increased to 500 mA cm^(-2),the area-specific capacity can be increased to 729 mF cm^(-2).This simple and low-cost preparation process and the superb electrochemical performance suggest great potential applications of CMS-CNO films in flexible supercapacitors.

关键词： carbon nano-onions composite films flexible supercapacitors

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Tuning anionic bands and lattice stability by short-range disorder at nanoscale for ultrastable Co-free Li-rich cathode

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science China Chemistry 2025年

作者： Ruiqi Zhao Xingchen Song Ziheng Zhang Jinping Zhang Chenghao Zheng Jie Zhu Jie Liu Kai Zhang Yanfeng Ma Chenxi Li Hongtao Zhang Yongsheng Chen The Centre of Nanoscale Science and Technology and Key Laboratory of Functional Polymer Materials Institute of Polymer ChemistryCollege of Chemistry Nankai University Renewable Energy Conversion and Storage Center (RECAST) Nankai University Department Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education) College of Chemistry Nankai University Engineering Research Center of High-efficiency Energy Storage (Ministry of Education) College of Chemistry Nankai University State Key Laboratory of Elemento-Organic Chemistry Nankai University

Ordered layered honeycomb structures are crucial for the unique redox mechanism in Co-free Li-rich oxide materials（LMNO）.However, oxygen release and irreversible cation migration originating from this distinctive structure during cycling have hindered the further commercialization of LMNO. Herein, we report a strategy to modulate the nanoscale atomic arrangement and electronic band structures by deliberately introducing an integrated short-range disorder in the Li-rich structure with Ce/F dual-doping（denoted as LMNO-CFSD）. This work explicitly reveals the induction of this disordered structure and comprehensively investigates its effects on the lattice stability. As a result, the LMNO-CFSD cathode exhibits a high energy density of934.8 Wh kgcathode-1, and achieves a remarkable lifespan of 800 cycles with 70.1% capacity retention at 1 C in LMNO-CFSD||graphite full cells. Spectroscopic studies corroborated by first-principles calculations reveal that this integrated short-range disorder with dual-doping effectively modulates the formation energy of oxygen vacancies. It also tailors the crystal and anionic band structure in the Li-rich phase, fundamentally mitigating detrimental oxygen release and transition metal migration during Li+（de） intercalation. Our findings illuminate the crucial role of correlated disorder in enhancing the electrochemical properties of Li-rich layered oxides, thereby offering new design principles for high-performance cathode materials in next-generation lithium batteries.

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Actuation performances of catkin fibers reinforced thiol-acrylate main-chain liquid crystalline elastomer

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International Journal of Smart and Nano Materials 2022年第4期13卷 668-690页

作者： Liru Yao Huixuan Yan Yifan He Nan Zhao Xiuxiu Wang Chensha Li Liguo Sun Yang He Yanju Liu Jianqi Zhang Key Laboratory of Functional Inorganic Material Chemistry Ministry of Education of the People’s Republic of China Heilongjiang University 150080HarbinP.R.China Institute of regulatory science Beijing Technology and Business University 100048BeijingP.R.China Key Laboratory of Chemical Engineering Process and Technology for High-Efficiency Conversion School of Chemistry and Material Science Heilongjiang University 150080HarbinP.R.China Center for Composite Materials and Structures Harbin Institute of Technology(HIT)150080HarbinP.R.China Department of Astronautical Science and Mechanics Harbin Institute of Technology(HIT)150001HarbinP.R.China Key Laboratory of Nanosystem and Hierarchical Fabrication National Center for Nanoscience and Technology 100190BejingP.R.China

Liquid crystalline elastomers(LCEs)have been utilized as an important class of smart actuator ***,the modest actuation mechanical and robustness performances remain a *** by the specific structures,well mechanical properties and physico-chemical characteristics of some natural plant fibers,a composite of thiol-acrylate main-chain LCE matrix incorporated with catkin fibers is designed and *** catkin fibers build a network as reinforcement phase,and demon-strate effective compatibility and integration property with the matrix,their high flexibility can be adapted to the large deforma-tional performance of LCE *** prepared LCE composite demonstrates strong mechanical actuation *** mod-ulus and driving force triggered by the stimuli are obviously *** tensile strength and fatigue failure resistant prop-erty under high loadings and repeated cycles of thermal actua-tion or photothermal actuation are greatly *** the stimulus response deformation rate,phase transition temperature and liquid crystal phase structure of the LCE matrix,and so on,do not weaken or *** work promotes the LCE materi-als’application potential and broadens the application value of natural plant fibers.

关键词： Liquid crystalline elastomer catkin fibers reinforcement materials smart composites mechanical actuation

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Automatic Detection of L12 Phase in L12-Strengthened High Entropy Alloy Based on Efficient Channel Attention and Convolutional Black Attention U2-Net

SSRN

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SSRN 2024年

作者： Liu, Zhihong Gao, Zhiming Qin, Weimin Lv, Chuantao Hu, Wenbin School of Material and Technology Tianjin University Tianjin30072 China Tianjin Key Laboratory of Composite and Functional Materials Tianjin300350 China Tianjin Pipe Manufacturing Co. Ltd. Technical Center Tianjin300301 China Key Laboratory of Advanced Ceramics and Machining Technology China

The tensile strength of precipitation strengthened high entropy alloys is mainly affected by the size and distribution of L12 phase. Traditional manual annotation of L12 phases is often inefficient and easily influenced by subjective factors. To address this issue, this paper proposes a multi mechanism fusion U2-net model for identifying L12 phases at different magnifications and scales in complex backgrounds. The model was compared with mainstream semantic segmentation models such as U2-net, U-net, FCN, Lraspp, and Deeplab_v3. The experimental results show that the optimized model improves model performance with minimal cost, and performs best on both the validation and test sets. The IoU and F1 scores on the test set reached 0.912 and 0.954, respectively, with accuracy and recall exceeding 0.95, close to the precision level of manual annotation. At the same time, the model can recognize nearly 16 SEM images per second, significantly higher than the speed of manual annotation. Further research shows that the optimized model maintains high performance within the contrast and brightness coefficient range of 0.5 to 1.5, indicating that the model has good generalization ability and robustness. The results of the ablation experiments indicate that adding either the ECA or CBAM modules individually can enhance the model's performance. The CBAM module performs slightly better than the ECA module as it can simultaneously attend to both the channel and spatial information of the feature maps. When both ECA and CBAM modules are added together, their synergistic effect results in the model achieving the best performance. In summary, the U2-net-ECA-CBAM model proposed in this article has significant advantages in L12 phase recognition tasks, providing a new solution for replacing manual annotation to achieve efficient automatic recognition of L12 phases. © 2024, The Authors. All rights reserved.

关键词： Entropy

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Dielectric elastomer actuators for artificial muscles:A comprehensive review of soft robot explorations

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Resources Chemicals and Materials 2022年第3期1卷 308-324页

作者： Yuhao Wang Xuzhi Ma Yingjie Jiang Wenpeng Zang Pengfei Cao Ming Tian Nanying Ning Liqun Zhang State Key Laboratory of Organic-Inorganic Composites Beijing University of Chemical TechnologyBeijing 100029China Beijing Advanced Innovation Center for Soft Matter Science and Engineering Beijing University of Chemical TechnologyBeijing 100029China Key Laboratory of Carbon Fiber and Functional Polymers Ministry of EducationBeijing University of Chemical TechnologyBeijing 100029China

Dielectric elastomer actuators (DEAs) artificial muscle is a typical interdisciplinary research category, which has developed by leaps and bounds in the past 20 years, showing great application prospects in various fields. Upon external electrical stimulation, dielectric elastomers (DEs) display large deformation, high energy density and fast response, affording a promising material candidate for soft robotics. Herein, the working mechanisms, commonly used materials as well as the concepts for improving the performance of DEA materials are introduced. Various DEA driven soft robots, including soft grippers, bioinspired artificial arms, crawling/walking/underwater/flying/jumping soft robots and tunable lenses, are then described in detail. Finally, the main challenges of DEA driven soft robots are summarized, and some perspectives for promoting the practical application of DEAs are also proposed.

关键词： Artificial muscles Dielectric elas tomer actuators Bioinspired Soft robots Smart materials

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Magnetic phase transitions in the triangular-lattice spin-1 dimer compound K2Ni2(SeO3)3

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Physical Review B 2024年第21期109卷 214430-214430页

作者： Lei Yue Ziyou Lu Kun Yan Le Wang Shu Guo Ruixin Guo Peng Chen Xiaobin Chen Jia-Wei Mei Department of Physics School of Science and State Key Laboratory on Tunable Laser Technology and Ministry of Industry and Information Technology Key Lab of Micro-Nano Optoelectronic Information System Shenzhen Institute for Quantum Science and Engineering International Quantum Academy Shenzhen 518048 China Dongguan Guangdong 523808 China Shenzhen Key Laboratory of Advanced Quantum Functional Materials and Devices

In our study, we conduct magnetization and heat capacity measurements to investigate field-induced magnetic phase transitions within the newly synthesized compound K2Ni2(SeO3)3, a spin-1 dimer system arranged on a triangular lattice. From our first-principles simulations, we determine that the spin system in K2Ni2(SeO3)3 can be represented as a two-dimensional triangular-lattice spin-1 dimer model, including an intra-dimer exchange of J1=0.32meV, an inter-dimer exchange of J2=0.79meV, and an easy-axis anisotropy of D=0.14meV. The presence of easy-axis magnetic anisotropy explains the distinct magnetic phase diagrams observed under c-axis directional and in-plane magnetic fields. Notably, our investigation unveils a two-step phase transition with the magnetic field aligned with the c direction. Our findings yield valuable insights into the magnetic phase transitions inherent to geometrically frustrated magnetic systems featuring dimer structures.

关键词： Frustrated magnetism Magnetic phase transitions Triangular lattice Magnetization measurements Specific heat measurements X-ray diffraction

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Progress in ceramic materials and structure design toward advanced thermal barrier coatings

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Journal of advanced Ceramics 2022年第7期11卷 985-1068页

作者： Zhi-Yuan WEI Guo-Hui MENG Lin CHEN Guang-Rong LI Mei-Jun LIU Wei-Xu ZHANG Li-Na ZHAO Qiang ZHANG Xiao-Dong ZHANG Chun-Lei WAN Zhi-Xue QU Lin CHEN Jing FENG Ling LIU Hui DONG Ze-Bin BAO Xiao-Feng ZHAO Xiao-Feng ZHANG Lei GUO Liang WANG Bo CHENG Wei-Wei ZHANG Peng-Yun XU Guan-Jun YANG Hong-Neng CAI Hong CUI You WANG Fu-Xing YE Zhuang MA Wei PAN Min LIU Ke-Song ZHOU Chang-Jiu LI State Key Laboratory for Mechanical Behavior of Materials School of Materials Science and EngineeringXi’an Jiaotong UniversityXi’an 710049China State Key Laboratory for Strength and Vibration of Mechanical Structures Department of Engineering MechanicsSchool of Aerospace EngineeringXi’an Jiaotong UniversityXi’an 710049China Xi’an Aerospace Composite Research Institute Xi’an 710025China AECC Beijing Institute of Aeronautical Materials Beijing 100095China School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China State Key Laboratory of New Ceramics&Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China Faculty of Materials and Manufacturing Key Laboratory of Advanced Functional MaterialsEducation Ministry of ChinaFaculty of Materials and ManufacturingBeijing University of TechnologyBeijing 100124China Faculty of Materials Science and Engineering Kunming University of Science and TechnologyKunming 650093China School of Materials Science and Engineering Beijing Institute of TechnologyBeijing 100081China Xi’an Key Laboratory of High Performance Oil and Gas Field Materials School of Materials Science and EngineeringXi’an Shiyou UniversityXi’an 710065China Shi-Changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China Shanghai Key Laboratory of Advanced High-temperature Materials and Precision Forming Shanghai Jiao Tong UniversityShanghai 200240China National Engineering Laboratory for Modern Materials Surface Engineering Technology the Key Lab of Guangdong for Modern Surface Engineering TechnologyInstitute of New MaterialsGuangdong Academy of SciencesGuangzhou 510650China School of Materials Science and Engineering Tianjin UniversityTianjin 300072China Integrated Computational Materials Research Centre Shanghai Institute of CeramicsChinese Academy of SciencesShanghai 201899China State Key Laboratory of Advanced Processing and Recycling of

Thermal barrier coatings(TBCs)can effectively protect the alloy substrate of hot components in aeroengines or land-based gas turbines by the thermal insulation and corrosion/erosion resistance of the ceramic top ***,the continuous pursuit of a higher operating temperature leads to degradation,delamination,and premature failure of the top *** new ceramic materials and new coating structures must be developed to meet the demand for future advanced TBC *** this paper,the latest progress of some new ceramic materials is first ***,a comprehensive spalling mechanism of the ceramic top coat is summarized to understand the dependence of lifetime on various factors such as oxidation scale growth,ceramic sintering,erosion,and calcium–magnesium–aluminium–silicate(CMAS)molten salt ***,new structural design methods for high-performance TBCs are discussed from the perspectives of lamellar,columnar,and nanostructure *** latest developments of ceramic top coat will be presented in terms of material selection,structural design,and failure mechanism,and the comprehensive guidance will be provided for the development of next-generation advanced TBCs with higher temperature resistance,better thermal insulation,and longer lifetime.

关键词： thermal barrier coatings(TBCs) ceramic material degradation and failure structure design long lifetime

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Recent progress in perovskite solar cells:from device to commercialization

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science China Chemistry 2022年第12期65卷 2369-2416页

作者： Xinhui Luo Xuesong Lin Feng Gao Yang Zhao Xiaodong Li Liqing Zhan Zexiong Qiu Jin Wang Cong Chen Lei Meng Xiaofeng Gao Yu Zhang Zijian Huang Rundong Fan Huifen Liu Yanrun Chen Xiaoxue Ren Jiahong Tang Chun-Hao Chen Dong Yang Yongguang Tu Xiao Liu Dongxue Liu Qing Zhao Jingbi You Junfeng Fang Yongzhen Wu Hongwei Han Xiaodan Zhang Dewei Zhao Fuzhi Huang Huanping Zhou Yongbo Yuan Qi Chen Zhaokui Wang Shengzhong(Frank)Liu Rui Zhu Jotaro Nakazaki Yongfang Li Liyuan Han State Key Laboratory of Metal Matrix Composites School of Material Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China State Key Lab for Mesoscopic Physics and Frontiers Science Center for Nano-optoelectronics School of PhysicsPeking UniversityBeijing 100871China Key Laboratory of Semiconductor Materials Science Institute of SemiconductorsChinese Academy of SciencesBeijing 100083China School of Physics and Electronic Science Engineering Research Center of Nanophotonics&Advanced InstrumentMinistry of EducationEast China Normal UniversityShanghai 200241China Key Laboratory for Advanced Materials and Institute of Fine Chemicals School of Chemistry and Molecular EngineeringEast China University of Science and TechnologyShanghai 200237China Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan 430074China Institute of Photoelectronic Thin Film Devices and Technology Renewable Energy Conversion and Storage CenterSolar Energy Research CenterNankai UniversityTianjin 300350China College of Materials Science and Engineering&Engineering Research Center of Alternative Energy Materials&Devices Ministry of EducationSichuan UniversityChengdu 610065China Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of Organic SolidsInstitute of ChemistryChinese Academy of SciencesBeijing 100190China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China Beijing Key Laboratory for Theory and Technology of Advanced Battery Materials Key Laboratory of Polymer Chemistry and Physics of Ministry of EducationSchool of Materials Science and EngineeringPeking UniversityBeijing 100871China School of Physics and Electronics Hunan Key Laboratory of Nanophotonics and DevicesCentral South UniversityChangsha 410083China Experimental Center for Advanced Materials School of Materials Science and EngineeringBeijing Institute of TechnologyBeijing 100081China Jia

Perovskite solar cells(PSCs) are undergoing rapid development and the power conversion efficiency reaches 25.7% which attracts increasing attention on their commercialization *** this review,we summarized the recent progress of PSCs based on device structures,perovskite-based tandem cells,large-area modules,stability,applications and ***,the challenges and perspectives are discussed,aiming at providing a thrust for the commercialization of PSCs in the near future.

关键词： perovskite solar cells device engineering stability application

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Variation of electron-electron interaction in pyrochlore structures

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Physical Review B 2024年第24期110卷 245147-245147页

作者： Jianyu Li Ji Liu Mingjun Han Waqas Haider Yusuke Nomura Ho-Kin Tang School of Science Harbin Institute of Technology Shenzhen 518055 China Shenzhen Key Laboratory of Advanced Functional Carbon Materials Research and Comprehensive Application Shenzhen 518055 China Institute for Materials Research Tohoku University Sendai 980-8577 Japan

We conduct a comprehensive ab initio investigation of electron-electron interactions within the pyrochlore structures of R2Ru2O7, R2Ir2O7, Ca2Ru2O7, and Cd2Ru2O7, where R denotes a rare-earth element. Utilizing a multiorbital Hubbard model, we systematically explore the effects of various rare-earth elements and applied high pressure on the correlation strength in these compounds. Our calculations on the Coulomb interaction parameter U and the bandwidth W reveal that the chemical pressure for R2Ru2O7 and R2Ir2O7 leads to an unusual increase in U/W ratio, hence, an increase in correlation strength. Contrary to conventional understanding of bandwidth control, our study identifies that the Hubbard U is more influential than the bandwidth W behind the metal-insulator landscape of R2Ru2O7 and R2Ir2O7, leading to an interaction-controlled metal-insulator transition. We also find unexpected behavior in physical pressure. Whereas physical pressure leads to a decrease in the correlation strength U/W as usual in R2Ru2O7, the effect is notably small in Ca2Ru2O7 and Cd2Ru2O7, which provides an important clue to understanding the unusual pressure-induced metal-insulator transition observed experimentally.

关键词： Metal insulator transition

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Microwave dielectric high-entropy ceramic Li(Gd_(0.2)Ho_(0.2)Er_(0.2)Yb_(0.2)Lu_(0.2))GeO_(4) with stable temperature coefficient for low-temperature cofired ceramic technologies

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Journal of Materials science & technology 2021年第34期93卷 28-32页

作者： Huaicheng Xiang Lei Yao Junqi Chen Aihong Yang Haitao Yang Liang Fang Shenzhen Key Laboratory of Special Functional Materials Shenzhen Engineering Laboratory for Advanced Technology of CeramicsGuangdong Research Center for Interfacial Engineering of Functional MaterialsCollege of Materials Science and EngineeringShenzhen UniversityShenzhen 518060China Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province.College of Physics and Optoelectronic Engineering Shenzhen UniversityShenzhen 518060China Guangxi Key Laboratory of Optical and Electronic Materials and Devices College of Materials Science and EngineeringGuilin University of TechnologyCuilin 541004China

High-entropy ceramics are new single-phase materials with at least four cation or anion *** large configurational entropy is believed to enhance the simultaneous solubility of many components,which can be used to optimize certain *** this work,a high-entropy oxide,Li(Gd_(0.2)Ho_(0.2)Er_(0.2)Yb_(0.2)Lu_(0.2))GeO_(4)(LRG)was explored as a microwave dielectric ceramic for lowtemperature cofired ceramic *** LRG high-entropy ceramic with an olivine structure formed in the sintering temperature range of 1020-1100℃.The minimal distortion(5×10^(-4))of the[RO_(6)]octahedron led to a stable temperature coefficient of resonant frequency(τf)of-5.3 to-2.9 ppm/℃.Optimal microwave dielectric properties were achieved in the high-entropy ceramics at 1080℃ for 4 h with a relative density of 94.9%,a relative permittivity(ε_(r))of 7.2,and a quality factor(Q×f)of 29000 GHz(at15.3 GHz).For low-temperature cofired ceramic technology applications,the sintering temperature of the LRG high-entropy ceramic was reduced to 900℃ by the addition of 3 wt%H_(3)BO_(3),which exhibited outstanding microwave dielectric properties(ε_(r)=7.6,Q×f=11700 GHz,and τ_(f)=-7.4 ppm/℃)and a good chemical compatibility with silver.

关键词： High-entropy ceramic Octahedral distortion Microwave dielectric properties Stableτ_(f)

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