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Chemical adsorption on 2D dielectric nanosheets for matrix free nanocomposites with ultrahigh electrical energy storage

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Science Bulletin 2022年第6期67卷 609-618,M0004页

作者： Jie Chen Zhonghui Shen Qi Kang Xiaoshi Qian Shengtao Li Pingkai Jiang Xingyi Huang Shanghai Key Laboratory of Electrical Insulation and Thermal Ageing Department of Polymer Science and EngineeringThe State Key Laboratory of Metal Matrix CompositesShanghai Jiao Tong UniversityShanghai 200240China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Center of Smart Materials and DevicesWuhan University of TechnologyWuhan 430070China School of Mechanical Engineering Shanghai Jiao Tong UniversityShanghai 200240China State Key Laboratory of Electrical Insulation and Power Equipment Xi'an Jiaotong UniversityXi'an 710054China

Relaxor ferroelectric polymers display great potential in capacitor dielectric applications because of their excellent flexibility,light weight,and high dielectric ***,their electrical energy storage capacity is limited by their high conduction losses and low dielectric strength,which primarily originates from the impact-ionization-induced electron multiplication,low mechanical modulus,and low thermal conductivity of the dielectric *** a matrix free strategy is developed to effectively suppress electron multiplication effects and to enhance mechanical modulus and thermal conductivity of a dielectric polymer,which involves the chemical adsorption of an electron barrier layer on boron nitride nanosheet surfaces by chemically adsorbing an amino-containing polymer.A dramatic decrease of leakage current(from 2.4×10^(-6)to 1.1×10^(-7)A cm^(-2)at 100 MV m^(-1))and a substantial increase of breakdown strength(from 340 to 742 MV m^(-1))were achieved in the nanocompostes,which result in a remarkable increase of discharge energy density(from 5.2 to 31.8 J cm^(-3)).Moreover,the dielectric strength of the nanocomposites suffering an electrical breakdown could be restored to 88%of the original *** study demonstrates a rational design for fabricating dielectric polymer nanocomposites with greatly enhanced electric energy storage capacity.

关键词： Boron nitride nanosheets Electron barrier layer Relaxor ferroelectric polymers Nanocomposites Electrical energy storage

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Effect of calcination temperatures on photocatalytic H_(2)O_(2)-production activity of ZnO nanorods

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Chinese Journal of Catalysis 2022年第2期43卷 226-233页

作者： Zicong Jiang Yong Zhang Liuyang Zhang Bei Cheng Linxi Wang State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070HubeiChina Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory Xianhu Hydrogen ValleyFoshan 528200GuangdongChina College of Chemistry and Chemical Engineering Hubei Polytechnic UniversityHuangshi435003HubeiChina Laboratory of Solar Fuel Faculty of Materials Science and ChemistryChina University of GeosciencesWuhan 430074HubeiChina

Photocatalytic hydrogen peroxide(H_(2)O_(2))production from O_(2) and H2O is an ideal process for solar‐to‐chemical energy ***,ZnO nanorods are prepared via a simple hydrothermal method for photocatalytic H_(2)O_(2) *** ZnO nanorods exhibit varied performance with different calcination *** from calcination,the separation efficiency of photo‐induced carriers is significantly improved,leading to the superior photocatalytic activity for H_(2)O_(2) *** H_(2)O_(2) produced by ZnO calcined at 300℃ is 285μmol L^(−1),which is over 5 times larger than that produced by untreated *** work provides an insight into photocatalytic H2O2 production mechanism by ZnO nanorods,and presents a promising strategy to H2O2 production.

关键词： Photocatalysis Hydrogen peroxide production ZnO nanorod Calcination temperature Oxygen reduction

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Ultraviolet and Thermal Dual-Curing Assisted Extrusion-Based Additive Manufacturing of Lunar Regolith Simulant for In-Site Construction on the Moon

SSRN

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SSRN 2023年

作者： Cui, Qianshun Wang, Tongcai Gu, Guangshuai Zhang, Rihan Zhao, Tingting Huang, Zhifeng Wang, Gong Chen, Fei Technology and Engineering Center of Space Utilization Chinese Academy of Sciences Beijing100094 China University of Chinese Academy of Sciences Beijing100049 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing International School of Materials Science and Engineering Wuhan University of Technology Wuhan430070 China

The establishment of a lunar base is crucial for lunar studies, resource extraction, and advancement in deep space exploration. Considering the limitations of rocket capacity and Earth-Moon transportation costs, lunar regolith is regarded as the most practical material for lunar base construction. Consequently, the in-situ additive manufacturing technology for simulated lunar regolith has been widely studied in recent years. This paper proposes a novel additive manufacturing approach for lunar regolith simulants. The simulants and several resins were mixed into a high-solid-loading paste, which was suitable for extrusion-based additive manufacturing process. To fully leverage the lunar environment, the feasibility of the ultraviolet (UV) and thermal curing of the resins was first verified, which was followed by the validation of the lunar regolith paste with the solid content of 86 wt.%. After the characterization of the ultraviolet and heat curing properties, the paste was further 3D printed via the extrusion-based device. The extruded paste underwent preliminary curing in a UV environment and was then heated to approximate the daytime lunar conditions, achieving complete curing of the printed component. The cured parts exhibited a compressive strength of 9.83 ± 1.07 MPa, meeting the requirements for infrastructure construction in the low-gravity lunar environment. This work offers significant implications for future in-situ construction on the Moon using extrusion-based lunar regolith additive manufacturing. © 2023, The Authors. All rights reserved.

关键词： 3D printing

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Mixed Solvent Dependent Surface Crystal Structure and Orientation of Electrospun Poly (Vinylidene Fluoride) Nanofibers with 2d Giwaxs Method

SSRN

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SSRN 2024年

作者： Liang, Yongri Gao, Yue Sun, Jiaxin Liu, Li Center for Advanced Structural Materials State Key Lab of Metastable Materials Science and Technology School of Materials Science and Engineering Yanshan University No. 438 West Hebei Avenue Hebei Qinhuangdao066004 China State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical Technology Beijing100029 China Key Laboratory of Beijing City on Preparation and Processing of Novel Polymer Materials Beijing University of Chemical Technology Beijing100029 China

Polyvinylidene fluoride (PVDF) nanofibers have wide applications in sensors, nanogenerators, and actuators due to their significant piezoelectric properties. However, there is still a lack of in-depth understanding the crystal structure and orientation of PVDF nanofibers, which significantly hinders further improving the piezoelectric properties of PVDF nanofibers. In this work, the effects of good and poor solvents composited mixed solvents on surface crystal structure and orientation of electrospun PVDF nanofibers were investigated using two-dimensional grazing incidence wide angle X-ray scattering (2D GIWAXS) with sample rotating, field emission-scanning electron microscope (FE-SEM), and piezoresponse force microscopy (PFM) methods. The relative β-phase content of PVDF nanofibers was enhanced when the AC volume fraction in the mixed solvents of DMF/AC or DMSO/AC increased. The evaporation rate and solubility parameters of solvents can significantly influence the surface crystal structure and morphology formation of PVDF nanofibers during electrospinning. When used the DMF/AC (6/4 v/v) solvent, the PVDF nanofibers (PVDF-DMF-6) had smooth surface morphology and had 76% of relative β-phase content. Whereas, when used DMSO/AC (6/4 v/v) solvent, the PVDF nanofibers (PVDF-DMSO-6) had fish scale-like surface morphology and had 96% of relative β-phase content. The 2D GIWAXS results revealed that the b-axis in the β-phase of PVDF-DMF-6 and PVDF-DMSO-6 nanofibers was oriented along nearly perpendicular orientation to the fiber direction, and had about 0.85 of degree of orientation. Additionally, the c-axis of γ-phases in the PVDF-DMSO-6 nanofibers was tilted approximately 64º from the fiber axis. Our results demonstrated that the orientation and size of β-phase crystals on the surface of PVDF nanofibers played significant roles in their polarization behaviors. © 2024, The Authors. All rights reserved.

关键词： Nanofibers

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Design and Strengthening Mechanism of Silver-Carbon Synergistic Reinforced Al Matrix Composites

SSRN

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SSRN 2023年

作者： Li, Junguo Yang, Xuebin Li, Peibo Zhang, Yang Luo, Guoqiang Shen, Qiang Sun, Yi State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China Chaozhou Branch of Chemistry and Chemical Engineering Guangdong Laboratory Chaozhou521000 China Hubei Longzhong Laboratory Hubei Xiangyang441000 China

Owing to inadequate interface contact between carbon and aluminum, enhancing the Al/C interface is crucial for the fabrication of high-performance Al matrix composites. This study selected polyvinyl butyral (PVB) with excellent dispersion properties as the carbon source. Simultaneously introducing silver to achieve synergistic reinforcement between silver and carbon in Al matrix composites, offering a novel reinforcement approach for Al matrix composites. The Al-16Ag-C composite is fabricated through the in-situ pyrolysis of PVB followed by hot pressing sintering. Subsequently, the effect of temperature on the microstructural evolution and mechanical properties of the composite is investigated. Microstructural characterization demonstrates the formation of two alloy phases, namely Ag2Al and Al4C3, within the Al-16Ag-C composite. The alloy phases, distributed at the grain boundaries, enhance the material’s strength by impeding dislocation motion, increasing dislocation density within the matrix, and limiting grain growth. The Al-16Ag-C composite, sintered at 630 °C, exhibits a remarkable ultimate tensile strength of 481 MPa and an elongation of 22.25%, representing a significant enhancement compared to pure Al. © 2023, The Authors. All rights reserved.

关键词： Polyvinyl butyral

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Phase-junction Ag/TiO_(2)nanocomposite as photocathode for H_(2)generation

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Journal of materials Science & technology 2021年第24期83卷 179-187页

作者： Hemdan S.H.Mohamed Mohamed Rabia Xian-Gang Zhou Xu-Sen Qin Gomaa Khabiri Mohamed Shaban Hussein A.Younus S.Taha Zhi-Yi Hu Jing Liu Yu Li Bao-Lian Su State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan430070China Physics Department Faculty of ScienceFayoum UniversityFayoum63514Egypt Nanophotonics and Applications Lab Physics DepartmentFaculty of ScienceBeni-Suef UniversityBeni-Suef62514Egypt Chemistry Department Faculty of ScienceFayoum UniversityFayoum63514Egypt Nanostructure Research Centre(NRC) Wuhan University of TechnologyWuhan430070China Laboratory of Inorganic Materials Chemistry(CMI) University of Namur61 rue de Bruxelles5000NamurBelgium

Developing anatase/rutile phase-junction in Ti O_(2)to construct Z-scheme system is quite effective to improve its photoelectrochemical *** this work,the anatase/rutile phase-junction Ag/Ti O_(2)nanocomposites are developed as photocathodes for hydrogen *** optimized Ag/Ti O_(2)nanocomposite achieves a high current density of 1.28 m A cm-2,an incident photon-to-current conversion efficiency(IPCE)of 10.8%,an applied bias photon-to-current efficiency(ABPE)of 0.32 at 390 nm and a charge carriers’lifetime up to 2000 *** enhancement on photoelectrochemical activity can be attributed to:(ⅰ)the generated Z-scheme system in the anatase/rutile phase-junction Ag/Ti O_(2)photocathode enhances the separation,diffusion and transformation of electron/hole pairs inside the structure,(ⅱ)Ag nanodots modification in the anatase/rutile phases leading to the tuned band gap with enhanced light absorption and(ⅲ)the formed Schottky barrier after Ag nanodots surface modification provides enough electron traps to avoid the recombination of photogenerated electrons and *** results here suggest that developing phase-junction nanocomposite as photocathode will provide a new vision for their enhanced photoelectrochemical generation of hydrogen.

关键词： Ag/TiO_(2)nanocomposites Anatase/rutile phase-junction Z-scheme Photocathode H2 generation

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Nanowires in composite solid-state electrolytes: synthesis, structures and applications

Nano Trends

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Nano Trends 2024年 7卷

作者： Dong, Guangyao Zhang, Hong Cheng, Yu Xu, Lin State Key Laboratory of Advanced Technology for Materials Synthesis and Processing School of Materials Science and Engineering Wuhan University of Technology Wuhan 430070 China Hubei Longzhong Laboratory Wuhan University of Technology (Xiangyang Demonstration Zone) Hubei Xiangyang 441000 China Hainan Institute Wuhan University of Technology Sanya 572000 China

Solid-state electrolytes (SSEs) are regarded as crucial materials, thus determining the comprehensive properties of solid-state lithium batteries (SSLBs). However, the existing issues of ion transport and interface limit their further development and application. As the inorganic solid-state electrolytes (ISEs) and polymer solid-state electrolytes (PSEs) both present obvious advantages and defects, the strategy of preparing composite solid-state electrolytes (CSEs) by incorporating inorganic components in polymer matrix is considered an effective way to overcome the above-mentioned problems. Nanowires with high aspect ratios are widely used in CSEs. Moreover, nanowires can not only effectively enhance the mechanical properties and ion transport efficiency of SSEs, but also boost the contact between electrolyte and electrode interface, thereby improving the cycle stability and safety of SSLBs. This review systematically categorized nanowires according to their morphology, function, and Li⁺ conductivity, and discussed their structural properties and synthesis strategies in detail. Moreover, application examples and mechanisms of nanowires in different polymer matrices are also introduced. In the summary and prospect section, we anticipate the existing challenges and future objectives of nanowires in the future research of CSEs. © 2024 The Authors

关键词： Composite solid-state electrolytes Inorganic fillers Nanowires Polymer matrix Solid-state lithium batteries

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Voltage Prediction and Extrapolation in Complex Pem Fuel Cell Conditions Via Transfer Learning from Localized Data

SSRN

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SSRN 2024年

作者： Zhu, Wenchao He, Tingwei Wu, Hangyu Yang, Yang Wei, Peng Xie, Changjun Xiong, Rui State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China School of Automation Wuhan University of Technology Wuhan430070 China Wuhan Industrial Technology Institute of Artificial Intelligence and New Energy Vehicles Wuhan430119 China Joint Laboratory for Advanced Energy Storage and Application School of Mechanical Engineering Beijing Institute of Technology Beijing100081 China

Transfer learning effectively leverages knowledge from source tasks to mitigate the reliance on large datasets in data-driven fuel cell health state prediction methods. However, in practical applications, the significant variation in degradation data distribution across different fuel cell types and operating conditions hinders knowledge transfer between source and target domains. Moreover, the complex and variable operating conditions of PEMFCs pose additional challenges to accurate prediction and diagnosis. Accurately characterizing future fuel cell stacks degradation characteristics under complex conditions using limited data from specific operating conditions is crucial for effective fuel cell health monitoring. A TCN-GRU-based transfer learning architecture is proposed to enable the transfer of knowledge from quasi-dynamic data to dynamic conditions. This approach reduces time costs by 41.56% and increases accuracy by 48.29%. Its generalization capability is thoroughly demonstrated across nine current levels in the activation and ohmic regions. Additionally, a voltage extrapolation method using Deep MMD is proposed. Based on limited data from specific operating conditions in the activation and ohmic regions, the proposed transfer learning method reconstructs voltage for future potential operating conditions, enabling precise characterization of fuel cell voltage degradation trends under unknown conditions, providing comprehensive insights for fuel cell operation. © 2024, The Authors. All rights reserved.

关键词： Extrapolation

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气体灌注超润湿膜分离溶质

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Science Bulletin 2023年第24期68卷 3111-3113页

作者：董莹李静阳晓宇 Department of Forensic Medicine Tongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430030China Hubei Province Key Laboratory of Coal Conversion and New Carbon Materials School of Chemistry and Chemical EngineeringWuhan University of Science and TechnologyWuhan 430081China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing&Shenzhen Research Institute&Laoshan Laboratory Wuhan University of TechnologyWuhan 430070China School of Engineering and Applied Sciences Harvard UniversityCambridge MA 02138USA

Membranes,including those that are based on nanofiltration and reverse osmosis(RO),have become important components of systems used for efficient removal of ions and small molecules from *** containing nanofiltration membranes are employed to separate divalent ions and>200 g mol-1molecules utilizing size-and charge-exclusion mechanisms.

关键词： mechanisms utilizing charge

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On the accurate characterization of quantum-dot light-emitting diodes for display applications

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npj Flexible Electronics 2022年第1期6卷 351-362页

作者： Wangxiao Jin Yunzhou Deng Bingbing Guo Yaxiao Lian Baodan Zhao Dawei Di Xiaowei Sun Kai Wang Shuming Chen Yixing Yang Weiran Cao Song Chen Wenyu Ji Xuyong Yang Yuan Gao Shuangpeng Wang Huaibin Shen Jialong Zhao Lei Qian Fushan Li Yizheng Jin Key Laboratory of Excited-State Materials of Zhejiang Province State Key Laboratory of Silicon MaterialsDepartment of ChemistryZhejiang University310027 HangzhouChina State Key Laboratory of Modern Optical Instrumentation College of Optical Science and EngineeringInternational Research Center for Advanced PhotonicsZhejiang University310027 HangzhouChina Department of Electronic and Electrical Engineering Southern University of Science and Technology518055 ShenzhenChina TCL Research ShenzhenGuangdongChina Shenzhen China Star Optoelectronics Semiconductor Display Technology Co. LtdShenzhenGuangdongChina College of Chemistry Chemical Engineering and Materials ScienceSoochow University199 Ren’ai Rd215123 SuzhouJiangsuChina Key Lab of Physics and Technology for Advanced Batteries(Ministry of Education) College of PhysicsJilin University130023 ChangchunChina Key Laboratory of Advanced Display and System Applications of Ministry of Education Shanghai University149 Yanchang RoadShanghai 200072China Najing Technology Corporation Ltd Hangzhou 310052China Institute of Applied Physics and Materials Engineering University of MacaoTaipaMacaoSAR 999078China Key Laboratory for Special Functional Materials of Ministry of Education National&Local Joint Engineering Research Center for High-Efficiency Display and Lighting Technologyand Collaborative Innovation Center of Nano Functional Materials and ApplicationsHenan UniversityKaifeng 475004China School of Physical Science and Technology MOE Key Laboratory of New Processing Technology for Non-ferrous Metals and MaterialsGuangxi Key Laboratory of Processing for Non-ferrous Metals and Featured MaterialsGuangxi UniversityNanning 530004China Division of Functional Materials and Nanodevices Ningbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo 315201China College of Physics and Information Engineering Fuzhou UniversityFuzhou 350108China

Quantum dot light-emitting diodes(QLEDs)are a class of high-performance solution-processed electroluminescent(EL)devices highly attractive for next-generation display *** the encouraging advances in the mechanism investigation,material chemistry,and device engineering of QLEDs,the lack of standard protocols for the characterization of QLEDs may cause inaccurate measurements of device parameters and invalid comparison of different ***,we report a comprehensive study on the characterizations of QLEDs using various *** show that the emission non-uniformity across the active area,nonLambertian angular distributions of EL intensity,and discrepancies in the adopted spectral luminous efficiency functions could introduce significant errors in the device *** errors in the operational-lifetime measurements may arise from the inaccurate determination of the initial luminance and inconsistent methods for analyzing the luminance-decay ***,we suggest a set of recommended practices and a checklist for device characterizations,aiming to help the researchers in the QLED field to achieve accurate and reliable measurements.

关键词： diodes characterization luminous

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