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Remarkably enhanced dielectric stability and energy storage properties in BNT–BST relaxor ceramics by A-site defect engineering for pulsed power applications

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Journal of advanced Ceramics 2022年第2期11卷 283-294页

作者： Zhipeng LI Dong-Xu LI Zong-Yang SHEN Xiaojun ZENG Fusheng SONG Wenqin LUO Xingcai WANG Zhumei WANG Yueming LI Energy Storage and Conversion Ceramic Materials Engineering Laboratory of Jiangxi Province China National Light Industry Key Laboratory of Functional Ceramic MaterialsSchool of Materials Science and EngineeringJingdezhen Ceramic UniversityJingdezhen 333403China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing School of Materials Science and EngineeringWuhan University of TechnologyWuhan 430070China Chengdu Hongke Electronic Technology Co. Ltd.Chengdu 610000China

Lead-free bulk ceramics for advanced pulsed power capacitors show relatively low recoverable energy storage density(Wrec)especially at low electric field *** address this challenge,we propose an A-site defect engineering to optimize the electric polarization behavior by disrupting the orderly arrangement of A-site ions,in which Ba_(0.105)Na_(0.325)Sr_(0.245−1.5x)□_(0.5x)Bi_(0.325)+xTiO_(3)(BNS_(0.245−1.5x)□_(0.5x)B_(0.325+x)T,x=0,0.02,0.04,0.06,and 0.08)lead-free ceramics are selected as the *** BNS_(0.245−1.5x)□_(0.5x)B_(0.325+x)T ceramics are prepared by using pressureless solid-state sintering and achieve large W_(rec)(1.8 J/cm^(3))at a low electric field(@110 kV/cm)when x=*** value of 1.8 J/cm3 is super high as compared to all other W_(rec) in lead-free bulk ceramics under a relatively low electric field(<160 kV/cm).Furthermore,a high dielectric constant of 2930 within 15%fluctuation in a wide temperature range of 40–350℃is also obtained in BNS_(0.245−1.5x)□_(0.5x)B_(0.325+x)T(x=0.06)*** excellent performances can be attributed to the A-site defect engineering,which can reduce remnant polarization(P_(r))and improve the thermal evolution of polar nanoregions(PNRs).This work confirms that the BNS_(0.245−1.5x)□_(0.5x)B_(0.325+x)T(x=0.06)ceramics are desirable for advanced pulsed power capacitors,and will push the development of a series of Bi0.5Na0.5TiO3(BNT)-based ceramics with high W_(rec) and high-temperature stability.

关键词： relaxor ferroelectrics energy storage ceramics ceramic capacitor Bi_(0.5)Na_(0.5)TiO_(3)(BNT) defect engine

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Effects of Silica-Modified Aluminum on the Microstructure and Properties of Diamond/Al-Si Composites 75

Effects of Silica-Modified Aluminum on the Microstructure an...

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75th World Foundry Congress, WFC 2024

作者： Fu, Jiaping Zhou, Canxu Liu, Yuan School of Materials Science and Engineering Tsinghua University Beijing100084 China Key Laboratory for Advanced Materials Processing Technology Ministry of Education Beijing100084 China

To improve the wettability of the Diamond/Aluminum (Dia/Al) composites interface and prevent the excessive formation of Al4C3, this study used silicon-modified aluminum as the matrix. The composites with different silicon content in the matrix were fabricated by the vacuum-assisted pressure infiltration method, and the effects of silicon content on the microstructure and properties of the composites was systematically studied. The results showed that the Dia/Al-Si composites had a uniform and dense microstructure with good interfacial bonding. With the increase in silicon content, both the thermal conductivity and bending strength of the composites first increased and then decreased, while the coefficient of thermal expansion decreased monotonically. When the silicon content was 12 wt.%, the composites prepared with 180 μm diamond particles exhibited the highest thermal conductivity and bending strength, reaching 654 W · m-1·K-1 and 296 MPa, respectively, and the coefficient of thermal expansion was as low as 6.13 × 10-6 ·K-1. This study indicates that the silicon-modified aluminum matrix can effectively suppress the excessive formation of Al4C3, and the coexisting of appropriate amount of Al4C3 or SiC at the interface enhances interfacial bonding, thereby improving the performance of the composites. © 2024 75th World Foundry Congress, WFC 2024. All rights reserved.

关键词： Bending strength

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Insights on advanced g‐C_(3)N_(4)in energy storage:Applications,challenges,and future

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Carbon Energy 2024年第4期6卷 22-78页

作者： Xiaojie Yang Jian Peng Lingfei Zhao Hang Zhang Jiayang Li Peng Yu Yameng Fan Jiazhao Wang Huakun Liu Shixue Dou School of Nuclear Technology and Chemistry&Biology Hubei Key Laboratory of Radiation Chemistry and Functional MaterialsHubei University of Science and TechnologyXianningChina Institute for Superconducting and Electronic Materials Australian Institute for Innovative MaterialsUniversity of WollongongNorth WollongongNew South WalesAustralia State Key Laboratory of Material Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhanChina Institute of Energy Materials Science University of Shanghai for Science and TechnologyShanghaiChina

Graphitic carbon nitride(g‐C_(3)N_(4))is a highly recognized two‐dimensional semiconductor material known for its exceptional chemical and physical stability,environmental friendliness,and pollution‐free *** remarkable properties have sparked extensive research in the field of energy *** review paper presents the latest advances in the utilization of g‐C_(3)N_(4)in various energy storage technologies,including lithium‐ion batteries,lithium‐sulfur batteries,sodium‐ion batteries,potassium‐ion batteries,and *** of the key strengths of g‐C_(3)N_(4)lies in its simple preparation process along with the ease of optimizing its material *** possesses abundant amino and Lewis basic groups,as well as a high density of nitrogen,enabling efficient charge transfer and electrolyte solution ***,the graphite‐like layered structure and the presence of largeπbonds in g‐C_(3)N_(4)contribute to its versatility in preparing multifunctional materials with different dimensions,element and group doping,and conjugated *** characteristics open up possibilities for expanding its application in energy storage *** article comprehensively reviews the research progress on g‐C_(3)N_(4)in energy storage and highlights its potential for future applications in this *** exploring the advantages and unique features of g‐C_(3)N_(4),this paper provides valuable insights into harnessing the full potential of this material for energy storage applications.

关键词： g‐C_(3)N_(4) lithium‐ion batteries lithium‐sulfur batteries potassium‐ion batteries sodium‐ion batteries supercapacitors

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Copper-promoted domino cyanation/Ullmann coupling toward difunctionalized acenaphthylenes with various optoelectronic properties

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Science China Chemistry 2023年第5期66卷 1450-1456页

作者： Yang Wang Yang Hu Junfeng Guo Zongrui Wang Yang Li Fengxiang Qie Chunfeng Shi Lei Zhang Yonggang Zhen Advanced Innovation Center for Soft Matter Science and Engineering State Key Laboratory of Organic-Inorganic CompositesBeijing University of Chemical TechnologyBeijing 100029China Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan 430074China State Key Laboratory of Luminescent Materials and Devices South China University of TechnologyGuangzhou 510640China Normal College Shenyang UniversityShenyang 110044China State Key Laboratory of Catalytic Materials and Reaction Engineering Research Institute of Petroleum ProcessingSINOPECBeijing 100083China

Tremendous progress has been made on aromatic fusion of acenaphthylene towards organic ***,scarce studies focus on the functionalization of acenaphthylene without resort to aromatic extension,although vinylene double bond is highly reactive ascribed to the ring strain of the fused ***,for the first time we employ copper-promoted domino cyanation/Ullmann coupling to achieve a series of difunctionalized acenaphthylene imides(ANIs)with varied optoelectronic *** Ullmann homocoupling and crosscoupling can be combined with cyanation for difunctionalization of *** introduction of cyano groups influences oppositely not only the energy levels but also the antiaromaticity of the fivemembered rings in ANIs relative to the dimethylamino substituent due to the electron donating or withdrawing *** altering the functional units,the optical and electrical characteristics have been tailored rationally;thus p,n or ambipolar semiconducting properties can be achieved for the ANI *** article opens up possibilities to the development of organic semiconducting materials based on ANIs without aromatic extension,which is promising for applications in organic electronics.

关键词： acenaphthylene difunctionalization organic semiconductors organic field-effect transistors

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Constructing MXene quantum dots decorated covalent organic frameworks as oil-based lubricant additive

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Science China materials 2025年第4期68卷 1220-1229页

作者： Yichen Wang Fei Zhao Haoyuan Yang Ke Yang Tianyi Zhang Qian Ye Yibo He Xuqing Liu State Key Laboratory of Solidification Processing Center of Advanced Lubrication and Seal MaterialsSchool of Materials Science and Engineering Northwester nPolytechnical UniversityXi'an 710072China

Nanoadditives offer a promising way to reduce friction and *** this study,an organic-inorganic hybrid material composed of MXene quantum dots(MQDs)and cetyl trimethylammonium bromide decorated covalent organic frameworks(CNUS-2)is successfully constructed via an electrostatic self-assembly *** combination of MQDs and CNUS-2 not only increases the interlayer spacing of NUS-2 but also mitigates the self-aggregation of MQDs,maximizing the advantages of their intrinsic *** to the synergistic lubrication effect of zero-dimensional MQDs and two-dimensional NUS-2,improved lubricity and interfacial bonding ability are *** addition,the relative slip between the CNUS-2@MQDs sheets can reduce friction and *** expected,different levels of CNUS-2@MQDs effectively boost the tribological *** friction coefficient(0.097)and wear volume(1.48×10^(5)µm^(3))of PAO-10 oil are reduced by 46.7%and 92.6%respectively,after the introduction of the 3.0 wt%CNUS-2@MQDs ***,the abundant oxygen-containing functional groups in CNUS-2 can accelerate the formation of adsorption and tribochemical reaction films,whereas the MQDs can repair worn surfaces,resulting in superior lubrication performance under variable load,temperature,and frequency *** work not only effectively improves lubrication performance by developing a unique CNUS-2@MQDs nanocomposite,but also provides a reference for the design of novel lubricant additives.

关键词： organic-inorganic hybrid material MXene quantum dots covalent organic frameworks electrostatically self-assembly synergistic lubrication

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Regulating crystallization and retarding oxidation in Sn-Pb perovskite via 1D cation engineering for high performance all-perovskite tandem solar cells

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Journal of Energy Chemistry 2025年第1期100卷 646-652页

作者： Ranran Liu Xin Zheng Zaiwei Wang Miaomiao Zeng Chunxiang Lan Shaomin Yang Shangzhi Li Awen Wang Min Li Jing Guo Xuefei Weng Yaoguang Rong Xiong Li Michael Grätzel Center for Mesoscopic Solar Cells Wuhan National Laboratory for OptoelectronicsHuazhong University of Science and TechnologyWuhan 430074HubeiChina Institute of Technology for Carbon Neutrality Shenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen 518055GuangdongChina School of Chemistry Chemical Engineering and Life SciencesState Key Laboratory of Advanced Technology for Materials Synthesis and ProcessingWuhan University of Technology430070HubeiChina Suzhou Institute of Nano-Tech and Nano-Bionics(SINANO) Chinese Academy of SciencesSuzhou 215123JiangsuChina School of Physics and Optoelectronic Engineering Hainan UniversityHaikou 570228HainanChina

All-perovskite tandem solar cells have the potential to surpass the theoretical efficiency limit of single junction solar cells by reducing thermalization ***,the challenges encompass the oxidation of Sn^(2+)to Sn^(4+)and uncontrolled crystallization kinetics in Sn-Pb perovskites,leading to nonradiative recombination and compositional heterogeneity to decrease photovoltaic efficiency and operational ***,we introduced an ionic liquid additive,1-ethyl-3-methylimidazolium iodide (EMIMI) into Sn-Pb perovskite precursor to form low-dimensional Sn-rich/pure-Sn perovskites at grain boundaries,which mitigates oxidation of Sn^(2+)to Sn^(4+)and regulates the film-forming dynamics of Sn/Pb-based perovskite *** optimized single-junction Sn-Pb perovskite devices incorporating EMIMI achieved a high efficiency of 22.87%.Furthermore,combined with wide-bandgap perovskite sub-cells in tandem device,we demonstrate 2-terminal all-perovskite tandem solar cells with a power conversion efficiency of 28.34%,achieving improved operational stability.

关键词： All-perovskite tandem solar cells Sn-Pb perovskite 1D Regulated crystallization Antioxidation

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Spatial phase structure and oxidation process of Al-W alloy powder with high sphericity

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Journal of materials Science & technology 2022年第19期114卷 62-72页

作者： Aobo Hu Shuizhou Cai State Key Laboratory of Material Processing and Die&Mould Technology The School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China

In this study,Al-30W(wt.%)alloy powder was prepared by Aluminothermic reduction and hightemperature gas *** then studied the phase composition,surface morphology,spatial phase structure,and thermal oxidation process using XRD,SEM/EDS,TEM,DSC,and DTA/TG *** results showed that the Al-30W alloy powder exhibited high sphericity,and the interior presented a special spatial phase structure in which the Al/W amorphous alloy phase and the metastable Al/W intermetallic compound phase were distributed in the pure Al *** the Al-30W alloy powder was stabilized in a vacuum tube furnace,the spatial phase structure of the alloy powder changed,and a small amount of pure Al was embedded in the Al_(12)W *** resulting Al-30W alloy powder products,treated in air at different temperatures,were collected in situ and *** results presented that with an increase in temperature,the types and morphologies of the Al/W intermetallic compounds in the Al-30W alloy powder ***,the Al-30W alloy powder began to undergo intense oxidation reactions at about 900℃,accompanied by a concentrated energy release and rapid weight *** volatilization of WO_(3)produced in the oxidation process promoted the complete oxidation of the Al-30W alloy powder,and the Al-30W alloy powder was completely oxidized at 1300℃.At this stage,all W atoms were transformed into gaseous WO_(3),and only a large number of small Al_(2)O_(3)fragments remained in the oxidation ***,the Al-30W alloy powder exhibited excellent thermal reactivity and oxidation integrity,and may offer excellent application prospects in the field of energetic materials.

关键词： Aluminothermic reduction High-temperature gas atomization Al/W amorphous alloy phase Metastable Al/W intermetallic compound phase Thermal oxidation process

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Liquid crystal elastomer composites for soft actuators

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International Journal of Smart and Nano materials 2023年第4期14卷 440-459页

作者： Jianbo Sun Chao Wang Yongjiao Liu Xudong Liang Zhijan Wang Aerospace Research Institute of Materials&Processing Technology FengtaiBeijingChina School of Science Harbin Institute of TechnologyShenzhenChina Key Laboratory of Aerospace Advanced Materials and Performance Ministry of EducationSchool of Materials Science and EngineeringBeihang UniversityBeijingChina Tianmushan Laboratory HangzhouChina

Liquid crystal elastomers are active materials that combine the anisotropic properties of liquid crystals with the elasticity of polymer *** LCEs exhibit remarkable reversible contraction and elongation capabilities in response to external stimuli,rendering them highly promising for diverse applications,such as soft robotics,haptic devices,shape morphing structures,etc,However,the predominant reliance on heating as the driving stimulus for LCEs has limited their practical *** drawback can be effectively addressed by incorporating fllers,which can generate heat under various *** recent progress in LCE composites has significantly expanded the application potential of *** this minireview,we present the design strategies for soft actuators with LCE composites,followed by a detailed exploration of photothermal and electrothermal *** as prominent ***,we provide an outlook on the challenges and opportunities in the feld of LCE composites.

关键词： Liquid crystal elastomers soft actuators soft robots active composites

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Poly(dopamine)-assisted Bioactive Coating on the Surface of Porous Poly (Ether Ether Ketone) to Promote Osteogenic Differentiation of rBMSC

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Journal of Wuhan University of technology(materials Science) 2021年第5期36卷 766-776页

作者： WANG Jin WANG Youfa WU Qingzhi State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Biomedical Material and Engineering Center of Hubei ProvinceWuhan University of TechnologyWuhan 430070China

A facile modification strategy is developed to promote the proliferation and osteogenic differentiation of rat bone marrow stromal cells(rBMSCs)through deposition of a bioactive calcium silicate(CS)coating on the porous surface of poly(ether-ether-ketone)(PEEK)with the assistance of poly(dopamine)(PDA).The porous structures are etched on the surface of PEEK after sulfonation treatment.A poly(dopamine)layer is coated on the porous surface of the sulfonated PEEK(SPEEK),which provides anchoring groups for the subsequent deposition of the CS *** show that the CS coating on the porous surface of SPEEK significantly improve the hydrophilicity and biomineralization formation of *** with PEEK,SPEEK-PDA-CS displays higher bioactivity to promote the proliferation and osteogenic differentiation of rBMSCs,including the increase of ALP activity and formation of calcium nodules,the expression of osteogenic differentiation-related *** results are beneficial to extending clinical applications of PEEK-based implants for bone tissue repair and orthopedic surgery.

关键词： poly(ether-ether-ketone) calcium silicate poly(dopamine) bioactivity osteogenic differentiation

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Rejuvenating LiNi_(0.5)Co_(0.2)Mn_(0.3)O_(2) cathode directly from battery scraps

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eScience 2023年第2期3卷 112-122页

作者： Yaqing Guo Chi Guo Pengjie Huang Qigao Han Fuhe Wang Hao Zhang Honghao Liu Yuan-Cheng Cao Yonggang Yao Yunhui Huang State Key Laboratory of Materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan430074 China State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074China Key Laboratory of Optoelectronic Chemical Materials and Devices Ministry of EducationSchool of Optoelectronic Materials&TechnologyJianghan UniversityWuhan 430056China

Battery recycling is indispensable for alleviating critical material shortages and enabling sustainable battery ***,current methods mostly focus on spent batteries,which not only require sophisticated disassembly and material extraction but also have unknown chemistries and states of health,resulting in high costs and extreme challenges to achieve ***,we propose the direct recycling and effective regeneration of air-degraded LiNi_(0.5)Co_(0.2)Mn_(0.3)O_(2)(NCM523)cathode directly from battery scraps generated during battery *** NCM523 shows surface degradation only a few nanometers deep and accordingly can be regenerated without adding Li,achieving restored properties(170 mAh g^(-1) at 0.1 C,92.7%retention after 1000 cycles)similar to those of fresh commercial *** analysis shows that scrap recycling has a profit of$1.984 kg^(-1),which is~10 times higher than conventional recycling,making it practical and economical to rejuvenate slightly degraded electrode materials for sustainable battery manufacturing.

关键词： Battery scrap Battery recycling Air degradation Cathode regeneration Techno-economic analysis

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