检索结果-内蒙古大学图书馆

SSRN 2024年

作者： Zhang, Haojun Ke, Shaoqiu Kuang, Ziyao Li, Haotian Chen, Tiantian Nie, Xiaolei Zhu, Wanting Wei, Ping He, Danqi Liu, Mingrui Zhao, Wenyu Zhang, Qingjie State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China Nanostructure research center Wuhan University of Technology Wuhan430070 China Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory Xianhu 528000 China

The low electrical transport performance of flexible thermoelectric (TE) films is the bottleneck that restricts the development of in-plane heat dissipation technology based on Peltier effect. The architectonics of magnetic materials into TE materials has been proven to be an effective method to improve the efficiency of TE conversion. In this study, a series of Bi0.5Sb1.5Te3 (BST)/Fe-NPs/BST thermo-electromagnetic (TEM) films were successfully prepared by orderly embedding ferromagnetic Fe nanoparticles (Fe-NPs) with different distribution shapes in BST matrix through screen-printing combined with hot-press curing. The study focuses on the influence of the ferromagnetism of Fe-NPs and Fe3O4-NPs -induced thermo-electromagnetic coupling on the microstructure and electro-thermal transport properties of BST. The results reveal a 36.5% enhancement in the maximum power factor (PF) of TEM films structured with Fe-NPs in a rhombic dot matrix sequence, while the applied Fe-NPs has no impact on the thermal conductivity, which remains at 0.94 Wm-1K-1 at room temperature, and the calculated zT value is 0.87 under the room temperature. The single-arm device prepared based on TEM thick films can achieve a cooling effect at 1.8 K, and the design of the in-plane heat dissipation device can realize a cooling efficiency in the cooling region reaching 2.8 K. In this paper, the effect of magnetic order on the electrical transport properties of BST thick films is explained from the point of view of the physical model for the first time. © 2024, The Authors. All rights reserved.

关键词： Thermal conductivity

来源：评论

学校读者我要写书评

暂无评论

A universal tactic of using Lewis-base polymer-CNTs composites as additives for high performance cm2-sized and flexible perovskite solar cells

引用

Science China Chemistry 2021年第2期64卷 281-292页

作者： Chang Liu Jingsong Sun Xiao-Fang Jiang Like Huang Qiang Lou Yi-Bing Cheng Shulin Song Ziyi Ge Ningbo Institute of Materials Technology and Engineering Chinese Academy of SciencesNingbo315201China Department of Materials Science and Engineering Monash UniversityClaytonVictoria3800Australia School of Physics and Telecommunication Engineering South China Normal UniversityGuangzhou510006China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan430070China

Lewis-base polymers have been widely utilized as additives to act as a template for the perovskite nucleation/crystal growth and passivate the under-coordinated Pb2+ ***,it is uncovered in this work that the polymer on the perovskite grain boundaries would significantly hinder the charge transport due to its low conductivity,which brings about free carrier recombination and photocurrent *** circumvent this issue while fully exploiting the benefits of polymers in passivating the trap states in perovskite,we incorporate highly conductive multiwall carbon nanotubes(CNTs) with Lewis-base polymers as coadditives in the perovskite *** the CNTs with-COOH group enables a selective hole-extraction and charge transport from perovskite to the hole transporting materials(HTM).By studying the charge transporting and recombination dynamics,we revealed the individual role of the polymer and CNTs in passivating the trap states and facilitating the charge transport,*** a result,the perovskite solar cells(PSCs) with polymer-CNTs composites exhibit an impressive PCE of 21.7% for a small-area device(0.16 cm2) and 20.7% for a large-area device(1.0 cm2).Moreover,due to the superior mechanical flexibility of both polymer and CNTs,the polymer-CNTs composites incorporation in the perovskite film encourages the fabrication of flexible PSCs(f-PSCs) with an impressive PCE of 18.3%,and a strong mechanical durability by retaining 80%of the initial PCE after 1,000 times *** addition,we proved that the selection criteria of the polymers can be extended to other long-chain Lewis-base polymers,which opens new possibilities in design and synthesis of inexpensive material for this tactic towards the fabrication of high performance large-area PSCs and f-PSCs.

关键词： passivation charge transport flexible perovskite solar cells

来源：评论

学校读者我要写书评

暂无评论

Step-scheme CdS/TiO_(2) nanocomposite hollow microsphere with enhanced photocatalytic CO_(2) reduction activity

引用

Journal of materials Science & technology 2020年第21期56卷 143-150页

作者： Zhongliao Wang Yifan Chen Liuyang Zhang Bei Cheng Jiaguo Yu Jiajie Fan State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan430070China School of Materials Science and Engineering Zhengzhou UniversityZhengzhou450001China

Converting solar energy into chemical energy by artificial photosynthesis is promising in addressing the issues of the greenhouse effect and fossil fuel ***,a novel photocatalyst,***/TiO_(2) hollow microspheres(HS),were dedicatedly designed to boost overall photocatalytic ***_(2) nanoparticles were in-situ decorated on the inside and outside the shell of Cd S HS,ensuring close contact between TiO_(2) and *** CdS/TiO2 HS with abundant mesopores inside of the shell boost the light absorption via multiscattering effect as well as accessible to reactions in all *** heterojunction was scrutinized and the charge transfer across it was revealed by in-situ irradiated X-ray photoelectron spectroscopy(ISI-XPS).Ultimately,the charge transfer in this composite was determined to follow stepscheme mechanism,which not only facilitates the separation of charge carriers but also preserves strong redox *** from the intimate linkage between Cd S and TiO_(2) and the favorable step-scheme heterojunction,enhanced photocatalytic CO_(2) reduction activity was *** CH4 yield rate of CdS/TiO_(2) reaches 27.85μmol g^(–1) h^(–1),which is 145.6 and 3.8 times higher than those of pristine CdS and TiO_(2),*** work presents a novel insight into constructing step-scheme photocatalytic system with desirable performance.

关键词： Step-scheme heterojunction CdS TiO_(2) Hollow microspheres Photocatalytic CO2 reduction

来源：评论

学校读者我要写书评

暂无评论

In Situ Transmission Electron Microscopy and Three-Dimensional Electron Tomography for Catalyst Studies

引用

Chinese Journal of Structural Chemistry 2022年第10期41卷 56-76页

作者： Chen Sun Kuo Liu Jian Zhang Qian Liu Xijun Liu Lili Han College of Chemistry Fuzhou UniversityFuzhou 350116China State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002China Key Laboratory of Spin Electron and Nanomaterials of Anhui Higher Education Institutes Suzhou UniversitySuzhou 234000China Institute for Advanced Study Chengdu UniversityChengdu 610106 China MOE Key Laboratory of New Processing Technology for Non-Ferrous Metals and Materials and Guangxi Key Laboratory of Processing for Non-Ferrous Metals and Featured MaterialsSchool of ResourceEnvironments and MaterialsGuangxi UniversityNanning 530004China

An in-depth understanding of the catalytic reaction mechanism is the key to designing efficient and stable catalysts. In situ transmission electron microscope(TEM) is the most powerful tool to visualize and analyze the microstructures of catalysts during catalysis. In situ TEM combined with three-dimensional(3D) electron tomography(ET) reconstruction technique enables interrogations of catalysts’ structural dynamics and chemical changes in high temporal and spatial dimensions. In this review, we discuss and summarize the recent advances in in situ TEM together with 3D ET for catalyst studies. Topics include the latest research progress of in situ TEM imaging as well as 3D visualization and quantitative analysis of catalysts. We also pay particular attention to artificial intelligence(AI)-enhanced smart 3D ET. These include deep learning(DL)-based data compression and storage for the analysis of large TEM data, recovery of wedge-shaped information lost in 3D ET reconstructions, and DL models for reducing residual artifacts in 3D reconstructed images. Finally, the challenges and development prospects of current in situ TEM and 3D ET research are discussed.

关键词： in situ TEM catalyst electron tomography 3D reconstruction artificial intelligence machine learning

来源：评论

学校读者我要写书评

暂无评论

Pressure-induced cation and vacancy disorder-order transition and near-zero τ_f in deficient hexagonal perovskite Ba8ZnTa6O24 dielectrics

引用

Science China Chemistry 2025年

作者： Bin Zheng Ruiwen Ji Cécile Genevois Wenda Zhang Xing Ming Qiang Zhang Mathieu Allix Congling Yin Xiaojun Kuang Xianran Xing MOE Key Laboratory of New Processing Technology for Nonferrous Metal and Materials Guangxi Key Laboratory of Optical and Electronic Materials and Devices College of Materials Science and Engineering Guilin University of Technology Centre National de la Recherche Scientifique (CNRS) CEMHTI UPR3079 Université d'Orléans College of Physics and Electronic Information Engineering Guilin University of Technology Neutron Scattering Division Oak Ridge National Laboratory Collaborative Innovation Center for Exploration of Nonferrous Metal Deposits and Efficient Utilization of Resources Guilin University of Technology Guangxi Key Laboratory of Electrochemical and Magnetochemical Functional Materials College of Chemistry and BioengineeringGuilin University of Technology Beijing Advanced Innovation Center for Materials Genome Engineering and Institute of Solid-State Chemistry University of Science and Technology Beijing

Pressure applications can enable the tuning of atomic/defect ordering and provide access to new functional materials. Here, we report that pressure-induced structural transformation featuring disorder-order transition of both cations and vacancies in the 8-layer deficient hexagonal perovskite tantalate dielectrics Ba8ZnTa6O24, which transformed the structure from twin to shift and remarkably lowered the temperature coefficient of resonant frequency τ_f down to near zero（～0.56 ppm/°C） from 38 ppm/°C for the twinned precursor. The atomic scale STEM-HAADF and EDS results confirm the ordering of Zn in the Ta host at the nanometer scale in the shifted material featuring well-ordered Ba8ZnTa6O24slabs intergrown with Ba3ZnTa2O9and Ba5Ta4O15monolayers and anti-phase grain boundaries as planar defects. The pressure-induced twin-shift structural transformation of Ba8ZnTa6O24features the rare constant concentration of the hexagonal stacked layers, which is allowed by the vacancy ordering at the central layers of face-shared octahedral（FSO） trimers avoiding the FSO B-B repulsion, and remarkably the faster cationic ordering kinetics compared with the 2:1 ordered complex perovskites. Although the inclusion of numerous planar defects and the oxidizable atomic defects led to significant p-type conduction and inhomogeneous electrical microstructures, resulting in an extraordinarily high extrinsic dielectric loss for the high-pressure shifted Ba8ZnTa6O24pellet, the intrinsically near-zero τ_fcould make the shifted Ba8ZnTa6O24perovskite an ideal microwave dielectric resonator candidate if the defects could be eliminated.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Effect of Cu and Mo Alloying on Microstructure and Molten Salt Corrosion Resistance of 347H Stainless Steel

引用

稀有金属材料与工程 2025年第4期54卷 862-870页

作者： Yu Zhiqi Zhao Yanchun Liu Tianzeng Feng Li Ma Huwen Li Jucang Pan Jixiang State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals School of Materials Science and EngineeringLanzhou University of TechnologyLanzhou 730050China Gansu Jiu Steel Group Hongxing Iron&Steel Co. LtdJiayuguan 735100China

A static corrosion experiment of 347H stainless steel alloyed with elements Cu and Mo was carried out in a nitrate molten salt(60%NaNO_(3)+40%KNO_(3))at 565℃ for 720 *** effects of elements Cu and Mo on the corrosion resistance of 347H stainless steel in molten salt were investigated by analyzing the phase composition,microstructure and chemical composition of the corrosion *** results show that the grain refinement induced by element Mo imparts the stainless steel with optimal corrosion resistance at a medium grain ***,the formation of MoC significantly enhances the intergranular corrosion resistance of the stainless *** stainless steel exhibits uniform corrosion in the nitrate *** corrosion layer displays a dual-layer structure,and the corrosion products protecting matrix are present in both the inner and outer *** outer layer consists of a mixture of Fe oxides(Fe_(2)O_(3),Fe_(3)O_(4)),NaFeO_(2),and a minor amount of MgFe_(2)O_(4).Conversely,the inner layer is primarily composed of a spinel layer(FeCr_(2)O_(4),MgCr_(2)O_(4))and a thin Cu_(2)O *** oxidation of Cu in the inner layer leads to the formation of a dense Cu_(2)O layer,effectively impeding O_(2)-plasma infiltration into the matrix.

关键词： alloying 347H stainless steel nitrate molten salt corrosion

来源：评论

学校读者我要写书评

暂无评论

Application of transparent casting moulds prepared by additive manufacturing technology in hydraulic simulation

引用

China Foundry 2022年第4期19卷 299-306页

作者： Qian Feng Xing Ran Ke-hui Hu Hao-yuan Wang Zhi-gang Lü State Key Laboratory of Tribology Tsinghua UniversityBeijing 100084China Department of Mechanical Engineering Tsinghua UniversityBeijing 100084China AVIC Heavy Machinery Co. Ltd.Guiyang 550005China Key Laboratory of Advanced Materials Processing Technology Ministry of EducationTsinghua UniversityBeijing 100084China

Hydraulic simulation is one of the critical methods to research the filling mechanism of molten metal in the casting ***,it only performs on test pieces with relatively simple structures due to the limitation of the preparation *** this study,the method of photocuring additive manufacturing was used to prepare the complex casting mould from transparent photosensitive *** pouring test was carried out under different centrifugal conditions,and the filling process of the gating system,support bars and other positions in the vertical direction was recorded and *** experimental results show that the internal liquid level and the filling process of the test piece prepared by this method can be observed *** angle between the liquid surface and the horizontal plane in the test piece gradually increases as the centrifugal rotational speed increases,which means the filling process is carried out from outside to inside at high rotational *** velocity of the fluid entering the runner increases with the increase of rotational speed,but the filling speeds is less affected by the centrifugal speed at other *** liquid flow is continuous and stable during the forward filling process,without splashing or interruption of liquid droplets.

关键词： additive manufacturing centrifugal casting investment casting hydraulic simulation transparent mould

来源：评论

学校读者我要写书评

暂无评论

The study of arc behavior with different content of copper vapor in GTAW

引用

China Welding 2022年第2期31卷 1-14页

作者： Fan Ding Yao Xinglong Hou Yingjie Huang Jiankang Li Dequan School of Materials Science and Engineering Lanzhou University of TechnologyLanzhou 730050China State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals Lanzhou 730050China

In order to understand the effects of different content of copper vapor entering the arc plasma on the arc behavior,the tungstencopper materials with copper contents of 0%,10%,20%and 30%were made into special tungsten electrodes,which replaced the melting electrode to generate copper *** effects of different content of copper vapor on the arc morphology,arc voltage,arc pressure,current density and arc axial temperature were *** copper vapor was transported into the arc plasma,the arc consisted of two parts:a high brightness arc core and the surrounding green luminous *** the observation and measurement of the stabilized arc,the results showed that as the content of copper vapor increased,the radius of the greenish region gradually increased,the brightness and size of the core area gradually decreased,the axial temperature of the arc gradually decreased and arc voltage gradually increased with a maximum difference of 1.5 *** is because the increase of copper vapor concentration changes the net emission coefficient,resulting in a decrease in arc temperature and electrical *** distribution of arc pressure and current density showed unimodal distribution on the anode surface,and as the content of copper vapor increased,the distribution curves were gradually flattening.A factor contributing to this is that with the increase of copper vapor concentration,the current tends to flow through the edge of the electrode,which expands the conductive path and makes the arc *** the coupling mathematical model of tungsten electrode and arc were established to further explain the experimental results.

关键词： the gas tungsten arc welding copper vapor arc behavior numerical simulation

来源：评论

学校读者我要写书评

暂无评论

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

引用

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

来源：评论

学校读者我要写书评

暂无评论

On-Surface Conversion Reaction Realizes advanced Red Phosphorus/Carbon Anode for High-Performance Lithium-Ion Batteries

SSRN

引用

SSRN 2024年

作者： Huang, Yujie Li, Hao Wu, Mengjun Tian, Tian Wang, Rui Zeng, Sixiu Song, Jiangping Tang, Haolin State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory Xianhu Hydrogen Valley Foshan528200 China Hubei Key Laboratory of Fuel Cells Wuhan University of Technology Wuhan430070 China

Red phosphorus (RP), the one of the most prospective anodes in lithium-ion batteries (LIBs), has been severely limited due to the intrinsic defects of massive volume expansion and low electronic conductivity. The vaporization-condensation-conversion (VCC), which confines RP nanoparticles into carbon host, is the most widely used method to address the above drawbacks and prepare RP/C nanostructured composites. However, the volume effect-dominated RP caused by the inevitably deposition of RP vapor on the surface of carbon material suffers from the massive volume change and unstable solid electrolyte interface (SEI) film. Herein, we propose a simple interfacial modification method to eliminate the superficial RP and yield stable surface composed of ion-conducting Li3PS4 solid electrolyte, endowing RP/AC composites excellent cycling performance and ultrafast reaction kinetics. Therefore, the RP/AC@S composites exhibit 926 mAh g−1 after 320 cycles at 0.2 A g−1 (running over 181 days), with 81.6% capacity retention and a corresponding capacity decay rate of as low as 0.059%. When coupled with LiFePO4 cathode, the full cells present superior cycling performance (62.1 mAh g−1 after 500 cycles at 1 A g−1) and excellent rate capability (81.1 mAh g−1 at 1.0 A g−1). © 2024, The Authors. All rights reserved.

关键词： Lithium compounds

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：