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

Tellurium intervened Fe-N codoped carbon for improved oxygen reduction reaction and high-performance Zn-air batteries

引用

Journal of materials Science & technology 2023年第6期137卷 215-222页

作者： Rui Wang Zihan Meng Xuemin Yan Tian Tian Ming Lei Rami Adel Pashameah Hala MAbo-Dief Hassan Algadi Nina Huang Zhanhu Guo Haolin Tang State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory Xianhu Hydrogen ValleyFoshan 528200China College of Chemistry and Environmental Engineering Yangtze UniversityJingzhou 434023China State Key Laboratory of Information Photonics and Optical Communications Beijing University of Posts and TelecommunicationsBeijing 100876China Department of Chemistry Faculty of Applied ScienceUmm Al-Qura UniversityMakkah 24230Saudi Arabia Department of Science and Technology University College-RanyahTaif UniversityP.O.Box 11099Taif 21944Saudi Arabia Department of Electrical Engineering Faculty of EngineeringNajran UniversityP.O.Box 1988Najran 11001Saudi Arabia College of Materials Science and Engineering Taiyuan University of Science and TechnologyTaiyuan 030024China Department of Chemical and Bimolecular Engineering Integrated Composites Laboratory(ICL)University of TennesseeKnoxvilleTN 37996USA Guangdong Hydrogen Energy Institute of WHUT Xianhu Hydrogen ValleyFoshan 528200China

Pyrolysis-acquired iron and nitrogen codoped carbon(Fe-N-C)has been comprehensively investigated for its promising oxygen reduction reaction(ORR)catalytic performance and structural *** modification of non-metal elements with larger atomic radius and the corresponding intrinsic microstructure-property relations are rarely *** this study,tellurium(Te)intervened Fe-N-C was prepared by micelles-induced polymerization with Te nanowires as an in-situ intervening *** out-plane bonding of Te with Fe induced the increase of both N content and proportion of pyridinic N on the material surface,thus improving the ORR catalytic *** assembled Zn-air battery demonstrated a maximum power density of 250 mW/cm^(2)and excellent rate capability under various discharge current densities,which was much better than the Pt/***,the current work demonstrates a novel Te/Fe-N-C material and reveals an original Te intervened Fe-N-C strategy and N reconfiguration mechanism,which is of great significance for the design of key materials in energy-related fields.

关键词： Te/Fe-N-C Assembly ORR Electrocatalysis Zn-air battery

来源：评论

学校读者我要写书评

暂无评论

Microstructure and mechanical properties of extruded Mg-Sn alloys with a heterogeneous grain structure

引用

Journal of Magnesium and Alloys 2024年

作者： Tong, Lin Jiang, Jing Bi, Guangli Li, Yuandong Chen, Tijun Zhang, Xiaoru Fang, Daqing State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals Lanzhou University of Technology Lanzhou730050 China School of Material Science and Engineering Lanzhou University of Technology Lanzhou730050 China State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong University Xi'an710049 China

The high-strength Mg-7Sn alloys (wt.%) with a heterogeneous grain structure were prepared by low-temperature extrusion (230 °C) with the extrusion ratio of 9:1 (9E230) and 17:1 (17E230). The two extruded alloys contained fine dynamic recrystallization (DRX) grains (FG) and coarse unDRX grains (CG). The difference in deformability between CG and FG leads to the formation of heterogeneous grain structure. The average grain size and basal texture intensities increased while the volume fraction of CG decreased with increasing extrusion ratio. Tensile testing results indicated that the extruded 17E230 alloy exhibited higher tensile strengths than 9E230 alloy, whose tensile yield strength (σ0.2), ultimate tensile strengths (σb), and elongation to failure (Εf) were 231.1 MPa, 319.5MPa, and 12.54 % respectively. The high tensile strengths of the extruded alloy mainly originated from grain refinement, texture strengthening, precipitation strengthening from a great number of nano-scale Mg2Sn phases, solid solution strengthening and hetero-deformation induced (HDI) strengthening, while the good ductility of the alloy was also mainly attributed to grain refinement, activation of the non-basal slip systems and HDI hardening. © 2024

关键词： Tensile strength

来源：评论

学校读者我要写书评

暂无评论

Achieving High-Strength Porous Tungsten with Wide Porosity Range Via Selective Dissolution W-Ti-Fe Precursor

SSRN

引用

SSRN 2024年

作者： Jia, Hao Zhang, Jian Ge, Shuai Zhu, Bing Liu, Ruxia Wu, Dongshuang Luo, Guoqiang Shen, Qiang State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China School of Materials Science and Engineering Nanyang Technological University Singapore639798 Singapore

Porous tungsten with wide porosity variation is considered a candidate for high-energy X-ray flash radiography. This work combines tape casting and dealloying to selectively dissolve a W-Ti-Fe precursor, achieving high-strength porous tungsten with a wide porosity range. The PVB exists on the surface of particles in the form of an amorphous carbon film after pyrolysis, providing conditions for the W-Fe-C interface reaction. The porosity of porous tungsten is 50.7~80.4%. The compressive strengths of porous tungsten with porosity of 50.7% and 80.4% are 221.9 MPa and 10.6 MPa, respectively. The dissolution of the Ti located in the ligament can enhance the porosity of porous tungsten. The coating composed of the solid solution formed at the interface of W and Ti during heat treatment and Fe3W3C can enhance the ligament strength. This work provides a theoretical reference for preparing porous tungsten with a wide porosity range and high performance. © 2024, The Authors. All rights reserved.

关键词： Dissolution

来源：评论

学校读者我要写书评

暂无评论

Awakening the oxygen evolution activity of MoS_(2) by oxophilic-metal induced surface reorganization engineering

引用

Journal of Energy Chemistry 2021年第11期30卷 546-551,I0013页

作者： Xueqin Mu Yang Zhu Xiangyao Gu Shipeng Dai Qixin Mao Lintao Bao Wenxuan Li Suli Liu Jianchun Bao Shichun Mu Jiangsu Key Laboratory of Biofunctional Materials School of Chemistry and Materials ScienceNanjing Normal UniversityNanjing 210023JiangsuChina Key Laboratory of Advanced Functional Materials of Nanjing Nanjing Xiaozhuang UniversityNanjing 211171JiangsuChina 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

Although molybdenum disulfide (MoS_(2))-based materials are generally known as active electrocatalysts for the hydrogen evolution reaction (HER), the inert performance for the oxygen evolution reaction (OER) seriously limits their wide applications in alkaline electrolyzers due to there exists too strong metal-sulfur (M−S) bond in MoS_(2). Herein, by means of surface reorganization engineering of bimetal Al, Co-doped MoS_(2) (devoted as AlCo_(3)-MoS_(2)) through in situ substituting partial oxidation, we successfully significantly activate the OER activity of MoS_(2), which affords a considerably low overpotential of 323 mV at −30 mA cm^(−2), far lower than those of MoS_(2), Al-MoS_(2) and Co-MoS_(2) catalysts. Essentially, the AlCo_(3)-MoS_(2) substrate produces lots of M−O (M=Al, Co and Mo) species with oxygen vacancies, which trigger the surface self-reconstruction of pre-catalysts and simultaneously boost the electrocatalytic OER activity. Moreover, benefiting from the moderate M−O species formed on the surface, the redistribution of surface electron states is induced, thus optimizing the adsorption of OH* and OOH* intermediates on metal oxyhydroxides and awakening the OER activity of MoS_(2).

关键词： Surface reorganization engineering Porous nanosheets Oxygen evolution reaction MoS_(2) Oxophilic-metal

来源：评论

学校读者我要写书评

暂无评论

Frequency-Self-Adaptive Radio Frequency Power Harvester Enabled by Shape-Reconfigurable Liquid Metal

引用

Electromagnetic Science 2024年第2期2卷 91-103页

作者： Cheng Zhang Yuchao Wang Zebin Zhu Hai Lin Kun Wang Xintong Shi Yi Du Chaoyun Song Long Ren Qiang Cheng Key Laboratory of Materials for High-Power Laser Shanghai Institute of Optics and Fine MechanicsChinese Academy of SciencesShanghai 201800China Hangzhou Institute for Advanced Study University of Chinese Academy of SciencesHangzhou 310024China College of Physical Science and Technology Central China Normal UniversityWuhan 430000China Center of Quantum and Matter Science and School of Physics Beihang UniversityBeijing 100191China Department of Engineering King’s College LondonLondon WC2R 2LSUK State Key Laboratory of Radio Frequency Heterogeneous Integration College of Electronics and Information EngineeringShenzhen UniversityShenzhen 518000China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing International School of Materials Science and EngineeringWuhan University of TechnologyWuhan 430000China State Key Laboratory of Millimeter Waves Southeast UniversityNanjing 210096China

Radio frequency(RF)energy harvester as an efficient tool for capturing and converting the flourishing ambient RF energy provides a promising solution for long-term powering the wireless sensor networks and the Internet of things(IoTs).However,the actual distribution of the environmental RF signals is dynamically frequency-dependent due to the diverse wireless terminals only interacting with specified *** take full advantage of the RF energy carrying this characteristic,an intelligent RF energy harvester is in demand to automatically sense the frequency information of an incident signal and conduct the corresponding RF-to-direct current transformation ***,to the best of my knowledge,a frequency-self-adaptive RF harvester is first presented with the help of the shape-reconfigurable liquid metal,which can precisely identify and efficiently convert an arbitrary signal from the frequency span of 1.8 to 2.6 *** with a microcontroller unit and a tensile system,the dynamic functionality of the entire system is comprehensively demonstrated,showing promising potential to significantly advance various fields,including sustainable IoT applications,green wearable technologies,and self-powered devices.

关键词： Liquid metal Radio frequency power harvesting Frequency-self-adaptive Broadband rectification

来源：评论

学校读者我要写书评

暂无评论

Textured silicon nitride ceramics with enhanced properties fabricated by high pressure sintering

引用

Ceramics International 2025年

作者： Tao, Haoyu Qin, Xiaowei Sui, Jiahua 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

Silicon nitride (Si3N4) ceramics with a textured morphology were prepared via high-pressure sintering in this study. The mechanical and thermal properties of the prepared materials in different orientations were investigated. Compared with the Si3N4 ceramics prepared at 1700 °C under low pressure of 50 MPa, the specimens prepared under high pressure of 200 MPa showed an obvious textured microstructure and a high fracture toughness (8.2 ± 0.5 MPa m1/2). Especially, the thermal conductivity was determined to be 105 W m−1 K−1 along the texture direction and 64 W m−1 K−1 in the vertical direction, respectively. The as-prepared Si3N4 with a morphological texture was anisotropic in hardness and toughness. High temperature and high pressure played a crucial role in the formation of Si3N4 ceramic texture and the enhancement of comprehensive properties. © 2025 Elsevier Ltd and Techna Group S.r.l.

关键词： Fracture toughness

来源：评论

学校读者我要写书评

暂无评论

Pressure-controlled synergy between dehydrogenation and densification in TiH2 sintering

引用

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

来源：评论

学校读者我要写书评

暂无评论

Acid-catalyzed chemodivergent reactions of 2,2-dimethoxyacetaldehyde and anilines

引用

Chinese Chemical Letters 2021年第4期32卷 1419-1422页

作者： Luxia Guo Zihao Chen Hongmei Zhu Minghao Li Yanlong Gu Huazhong University of Science and Technology Hubei Key Laboratory of Material Chemistry and Service FailureWuhan 430074China State Key Laboratory for Oxo Synthesis and Selective Oxidation Lanzhou Institute of Chemical PhysicsLanzhou 730000China The Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bingtuan Shihezi UniversityShihezi 832004China

Chemodivergent reactions of 2,2-dimethoxyacetaldehyde and anilines were described,which were established on the basis of either a C—C bond cleavage or a rearrangement process of a reaction inte *** reactions proceeded in a condition-determined manner with good functional group *** the first model,2,2-dimethoxyacetaldehyde reacted with aniline to form a new C—N bond,in the presence of O_(2),via a C—C bond cleavage ***,in the second model,by performing the reaction in the absence of O_(2),Heyns rearrangement occurred and generated a new C—O bond to form methyl *** condition-determined reactions not only offered the new way for valueadded conversion of biomass-derived platform molecule,2,2-dimethoxyacetaldehyde,but also provided efficient methods for the synthesis of N-arylformamides and methyl phenylglycinates.

关键词： Condition-determined reaction Chemodivergent reaction 2 2-Dimethoxyacetaldehyde C-C bond cleavage Heyns rearrangement

来源：评论

学校读者我要写书评

暂无评论

Oriented Growth for Efficient and Scalable Perovskite Solar Cells by Vapor-Solid Reaction

SSRN

引用

SSRN 2023年

作者： Duan, Changyu Zhong, Jialing Hu, Shenghan Dou, Yichen Lu, Jianfeng Cheng, Yi-Bing Ku, Zhiliang State Key Laboratory of Advanced Technologies for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China State Key Laboratory of Silicate Materials for Architectures Wuhan University of Technology Wuhan430070 China

The precise control and understanding of crystal orientation in perovskite polycrystalline films are crucial for the development of efficient and stable devices. However, achieving this control remains a significant challenge. Herein, we have developed a PbI2 oriented growth strategy, combining with in-situ vapor-solid reaction transformations, to achieve oriented growth of full-vacuum perovskite films. GIWAXS analysis revealed the general pattern of PbI2 oriented vapor growth and in-situ vapor-solid reaction transformation in this two-step process. The resulting preferred orientation has effectively reduced trap states density, optimizing the carrier dynamics. As a result, champion efficiencies of 22.11% (0.148 cm2), 20.60% (1 cm2) and 19.41% (5 × 5 cm2 mini-modules) are achieved, which are the highest value for perovskite based on vapor-solid reaction. Additionally, the oriented growth method is applicable to a variety of guide layers and is extended to 30 × 30 cm2 film, demonstrating the universality and scalability of the method. © 2023, The Authors. All rights reserved.

关键词： Perovskite solar cells

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：