检索结果-内蒙古大学图书馆

Defect and Doping Co‑Engineered Non‑Metal Nanocarbon ORR Electrocatalyst

Nano-Micro Letters 2021年第4期13卷 178-207页

作者： Jian Zhang Jingjing Zhang Feng He Yijun Chen Jiawei Zhu Deli Wang Shichun Mu Hui Ying Yang Key Laboratory of Material Chemistry for Energy Conversion and Storage Ministry of EducationSchool of Chemistry and Chemical EngineeringHuazhong University of Science and TechnologyWuhan 430074People’s Republic of China Pillar of Engineering Product Development Singapore University of Technology and Design8 Somapah RoadSingapore 487372Singapore State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070People’s Republic of China Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory Xianhu Hydrogen ValleyFoshan 528200People’s Republic of China

Exploring low-cost and earth-abundant oxygen reduction reaction(ORR)electrocatalyst is essential for fuel cells and metal–air *** them,non-metal nanocarbon with multiple advantages of low cost,abundance,high conductivity,good durability,and competitive activity has attracted intense interest in recent *** enhanced ORR activities of the nanocarbons are normally thought to originate from heteroatom(e.g.,N,B,P,or S)doping or various induced ***,in practice,carbon-based materials usually contain both dopants and *** this regard,in terms of the co-engineering of heteroatom doping and defect inducing,we present an overview of recent advances in developing non-metal carbon-based electrocatalysts for the *** characteristics,ORR performance,and the related mechanism of these functionalized nanocarbons by heteroatom doping,defect inducing,and in particular their synergistic promotion effect are emphatically analyzed and ***,the current issues and perspectives in developing carbon-based electrocatalysts from both of heteroatom doping and defect engineering are *** review will be beneficial for the rational design and manufacturing of highly efficient carbon-based materials for electrocatalysis.

关键词： Defect Doping Electrocatalyst Oxygen reduction reaction Non-metal nanocarbon

来源：评论

学校读者我要写书评

暂无评论

Dynamic response of B4C, TiB2 and TiB2-B4C under shock wave compression

引用

Ceramics International 2025年

作者： Shu, Zaiqin Jing, Qiang Wan, Mingming Zhang, Jinyong School of Physics and Mechanics Wuhan University of Technology Wuhan430070 China School of Material Science and Engineering Wuhan University of Technology Wuhan430070 China State Key laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China Inner Mongolian Metal Materials Research Institute Yantai264003 China

TiB2-B4C (TBC) has been widely utilized in lightweight armor due to its exceptional mechanical properties. The Hugoniot elastic limit (HEL) has been considered as an important dynamic property of ceramics. This paper presents the shock responses of pure B4C, pure TiB2, and TiB2-B4C composite. By microstructure analysis, the amorphization in B4C and dislocations in TiB2 at shock pressures around 37 GPa in the recycled debris were observed. The dislocations in TiB2 are believed to be the reason for ‘two HELs’ in TiB2. The addition of TiB2 has little effect on the shock properties of B4C, while the shock pressure exceeds HEL. Additionally, a failure wave was detected in the ceramics at shock pressures lower than HEL. A damage parameter was defined to quantify the extent of damage in the failure zone. The incorporation of TiB2 into B4C can significantly slow down failure propagation in TBC at pressure lower than HEL. Furthermore, the analysis of the damage parameter suggests that TBC exhibits superior impact resistance compared to pure B4C and TiB2. © 2025 Elsevier Ltd and Techna Group S.r.l.

关键词： Amorphization

来源：评论

学校读者我要写书评

暂无评论

Ceramizable Cf/BPR composites with enhanced oxidation resistance up to 1670 °C

引用

Ceramics International 2025年

作者： Li, Junguo Zhao, Chenhan Jiang, Feng Zhang, Shiquan Yang, Suohui Xiang, Qianqian Li, Meijuan zhang, Jian Shen, Qiang School of Material Science and Engineering Wuhan University of Technology Wuhan430070 China School of Chemistry Chemical Engineering and Life Science Wuhan University of Technology Wuhan430070 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China

Ceramizable carbon fiber/boron-modified phenolic resin (Cf/BPR) composites are cost-effective and suitable for fabricating large-scale components, making them vital for thermal protection systems in aerospace vehicles. However, their thermal resistance requires further improvement. This study investigates the modification of Cf/BPR composites using ZrSi2, Al, and mica to enhance their thermal resistance. High-temperature static oxidation and oxyacetylene ablation tests are conducted to evaluate their high-temperature performance. The role of each filler on oxidation resistance is discussed. The results reveal that when ZrSi2 is added at 33.75 phr, Al at 3.75 phr, and mica at 5 phr, the prepared composite exhibits a flexural strength of 56 MPa after 20 min of static oxidation at 1600 °C, with excellent protection of the carbon fibers. After oxidation at 1670 °C, the flexural strength remains at 45 MPa, despite some degree of carbon fiber ablation. © 2025 Elsevier Ltd and Techna Group S.r.l.

关键词： Carbon fibers

来源：评论

学校读者我要写书评

暂无评论

Strongly Enhancing the Energy Storage Properties and Stability of Amorphous BaTiO3 Thin Films via Ions Doping

SSRN

引用

SSRN 2024年

作者： Chang, Ruiling Yao, Zhonghua Xing, Yutong Wang, Jun Hao, Hua Cao, Minghe Liu, Hanxing State Key Laboratory of Advanced Technology for Materials Synthesis and Processing School of Material Science and Engineering Wuhan University of Technology Wuhan430070 China International School of Material Science and Engineering Wuhan University of Technology Wuhan430070 China Sanya Science and Education Innovation Park of Wuhan University of Technology Sanya572000 China

Amorphous thin films with high power density and breakdown strength satisfy the needs of advanced power electronic systems. Nonetheless, improving the energy storage density of amorphous films is critical for addressing the growing demand for electricity. We apply high spontaneous polarization BaTiO3 as the main component to make (1-x)Ba(Ti0.99Mn0.02)O3-xBiFeO3((1-x)BTM-xBF) thin films. Doping BiFeO3 (BF) synergistically boosts polarization. The introduction of amorphous phases and Mn ions enhances the breakdown strength. The results demonstrate that, at x=0.10, the film can achieve both a high efficiency of 80.3% and an excellent energy storage density of 111.3 J cm-3. Moreover, the film has a strong thermal stability within a broad range of 20°C ~ 160°C, as well as the cycling reliability is as high as 105 times. The present study offers a practical approach to develop film capacitors with outstanding energy storage capabilities. © 2024, The Authors. All rights reserved.

关键词： Amorphous films

来源：评论

学校读者我要写书评

暂无评论

Ultrahigh Yield Strength Heterostructured Titanium Matrix Composites by Controlling Α Variant Selection

SSRN

引用

SSRN 2023年

作者： Zhu, Ke Huang, Jin Nie, Wei Liu, Ruxia Xiao, Yong Zhang, Jian Luo, Guoqiang Shen, Qiang State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China Institute for Carbon Neutrality University of Science and Technology Beijing Beijing100083 China School of Material Science and Engineering

Enhancing the strength and plasticity of materials in a synergistic manner is a longstanding challenge in materials science. The content of β-stabilizing element W in Ti alloys is controlled using a chemical boundary engineering (CBE) strategy. Heterostructured Ti-xW composites are designed with α grain boundaries as the outer shell, α/β lamellar organization as the intermediate transition layer, and acicular martensite as the core region. This material exhibits a remarkable compressive yield strength of 2100 MPa, surpassing the majority of reported titanium matrix composites. The exceptional strength primarily arises from the precipitation strengthening of α/β lamellar organization and acicular martensite in the core region. Additionally, the gradient structure resulting from varying concentrations of W elements contributes to hetero-deformation induced (HDI) strengthening. This study holds significant implications for the development and design of high-strength heterostructured titanium matrix composites. © 2023, The Authors. All rights reserved.

关键词： Martensitic transformations

来源：评论

学校读者我要写书评

暂无评论

Electrical Properties and Degradation Behavior of Bnt-Bt-Ln Ceramics

SSRN

引用

SSRN 2023年

作者： Xu, Qi Yan, Xuerui He, Xin Dong, Shengde Ma, Luxiang Hai, Chunxi Zhou, Yuan Liu, Hanxing College of Materials and Chemistry & Chemical Engineering Chengdu University of Technology Chengdu610059 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing School of Material Science and Engineering Wuhan University of Technology Wuhan430070 China

Dielectric capacitors are widely used in pulse power systems, electric vehicles, aerospace and defense technology as critical electronic components. Due to the miniaturization and diversification of electronic components, higher requirements are put on the electrical properties and the service life of dielectric capacitors. In this paper, the phase structure, microstructure, dielectric, ferroelectric and failure behavior of (1-x)(Bi0.5Na0.5TiO3-BaTiO3)-xLiNbO3 (BNT-BT-LN, x = 0.01, 0.03, 0.05, 0.07, 0.10) lead-free ceramics were investigated. All the samples exhibited perovskite phase with no secondary impurity. With increasing LiNbO3 concentration, the average grain size gradually increases from 0.78 μm to 1.75 μm. For the composition x = 0.07, the temperature coefficient of capacitance (TCC150°C) was lower than 15% in the range of 35 °C - 400 °C with moderate permittivity (Εr 150 °C = 2050) and low dielectric loss (tanδ150 °C = 0.005). The RC constant is above 19.3 s up to 245 °C. Through Highly Accelerated Life Test (HALT), the mean time to failure (TTF) empirical formula for BNT-BT-LN dielectrics is established. It indicates that the degradation of the insulation resistance process is caused by the electromigration of oxygen vacancies and the TTF is predicted to reach 4.67×106 h at 7 kV/mm and room temperature. © 2023, 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

Preface to Special Issue for 2nd Chinese Symposium on Photocatalytic materials (CSPM2)

引用

Chinese Journal of Catalysis 2021年第1期42卷 1-2页

作者： Jiaguo Yu Zhaosheng Li Shifu Chen State Key Laboratory of Advanced Technology for Material Synthesis and Processing Wuhan University of TechnologyChina College of Engineering and Applied Sciences Nanjing UniversityChina Key Laboratory of Clean Energy and Green Circulation Huaibei Normal UniversityChina

With the ever-increasing consumption of fossil fuels and the increment in environmental pollution problems,developing sustainable and renewable energy sources and environmentally friendly purification methods has become an appeal investigation all over the *** can provide promising solutions to these issues,by utilizing solar light to reduce CO2 into hydrocarbon fuels,to split water into hydrogen and to mineralize organic pollutants into inorganic ***,a huge obstacle to the application of this technology is its low photocatalytic *** improvement on the performance of photocatalytic materials is urgently ***,this investigation topic was within the scope of The 2nd Chinese Symposium on Photocatalytic materials(CSPM2)held at Nanjing Jinling Riverside Hotel,Nanjing,China on November 8-11,*** conference was organized by Nanjing University,Huaibei Normal University,Changsha University,Fuzhou University and Wuhan universityof technology,and supported by National Natural Science Foundation of China(NSFC),Nanjing University,Huaibei Normal University,Changsha University,Wuhan University of technology,Beijing Perfectlight and *** are more than 420 experts and students attending this symposium,and 12 plenary lectures,17 keynote lectures,9 invited lectures,12 oral lectures and 115 posters ***,18 excellent posters were selected.

关键词： utilizing Nanjing increment

来源：评论

学校读者我要写书评

暂无评论

Simultaneous optimization of lattice and spin configurations in atomic scale simulation of magnetic materials

引用

Physical Review B 2025年第13期111卷 134412-134412页

作者： Zhengtao Huang Teng Yang Hanxing Liu Ben Xu State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Center for Smart Materials and Device Integration School of Material Science and Engineering Wuhan University of Technology Wuhan 430070 People's Republic of China Graduate School of China Academy of Engineering Physics Beijing 100088 People's Republic of China School of Materials Science and Engineering Tsinghua University Beijing 100084 People's Republic of China

Large scale atomistic simulations involving spin-lattice coupling are at the forefront of research in condensed matter physics and materials science. A key challenge lies in determining the ground state configurations of spins and lattices given this strong coupling, complicated by their evolution adherence to distinct governing equations. Unlike first-principles calculations, where the magnetic configuration is naturally determined by minimizing the electronic energy, no existing algorithm can simultaneously optimize both lattice and spin degrees of freedom at the atomic scale. This paper introduces a synergistic optimization framework for lattice and spin optimization in magnetic materials, overcoming the conventional separation approach. Employing a “pseudoatomic” method, the simultaneous optimization of atomic and spin configurations enhances accuracy and speed, enabling both atomic scale precision and large scale calculations. Applied to face-centered-cubic iron and BiFeO3, this approach demonstrates effective convergence, offering a robust tool for complex spin-lattice coupling problems, which paves a path for addressing high-dimensional optimization problems.

关键词： Atoms

来源：评论

学校读者我要写书评

暂无评论

Rationally Designing Anti-Poisoning Polymer Electrolyte by Electronegativity Modulation: Towards Efficient Ammonia-Cracked Hydrogen Fuel Cells

SSRN

引用

SSRN 2023年

作者： Shuai, Jiaqi Zhao, Shengqiu Liao, Yucong Wu, Fanglin Wang, Rui Wang, Letian Shen, Chunhui Tang, Haolin State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China Department of Polymer Materials & Engineering School of Material Science & Engineering Wuhan University of Technology Wuhan430070 China Hubei Key Laboratory of Fuel Cells Wuhan University of Technology Wuhan430070 China

Ammonia as a hydrogen enrichment medium has tremendous advantages over pure hydrogen in terms of transportation and utilization. The high-efficiency anti-ammonia-poisoning membrane electrode assembly (MEA) is pivotal for the practical implementation of ammonia-resistant proton exchange membrane fuel cells (PEMFCs). As for the polymer electrolyte, which is an integral part of the proton exchange membrane (PEM) and catalytic layer (CL) binder in the MEA, structural design is an effective way to improve its resistance to ammonia poisoning. Herein, an in-depth study of sulfonimides with superacidic structures reveals that the proton dissociation energies can be altered by tuning the terminal groups with different electronegativity and enhancing the competitive adsorption of protons on Pt. Four perfluorinated backbone sulfonimides (PFSI-x (x= TSM, MSA, ESA, and iPSA)) with distinct charge delocalization were fabricated by grafting different electronegative monomers onto the perfluorosulfonyl fluoride (PFSF). The results show that PFSI-TSM possesses a higher electrostatic potential (2.69 eV) and the lowest activation energy (12.07 KJ/mol). Meanwhile, the performance of the PFSI-TSM PEM fuel cell is 40.6% higher than the PFSA at 80°C, 100% relative humidity (RH) under 100 ppm NH3, with a maximum power density of 635.2 mW/cm2. The underlying reason for enhanced performance is in virtue of the more electronegative end groups render the superacid electrolyte with higher acidity and pKa values, which change the direction of the acid dissociation equilibrium reaction on the Pt surface, enhance the competitive adsorption of protons in the MEA and reduces the probability of ammonia adsorption poisoning. The insights in charge delocalization and proton ionization construct the structure-property relationship which would provide the guidance for a rational design of PEM for ammonia-resistant fuel cells. © 2023, The Authors. All rights reserved.

关键词： Electronegativity

来源：评论

学校读者我要写书评

暂无评论

Effect of pH, milling time, and Isobam content on porous silicon nitride ceramics prepared by gel casting

Advanced Powder Materials

引用

advanced Powder materials 2023年第1期2卷 100-107页

作者： Hailing Yang Zhi Wang Mengyong Sun Fei Chen Jun Ji Sique Chen Yingying Chen Deli Ma Zhenyu Zhang Baocai Pan Yulin Wei Qinggang Li Shandong Provincial Key Laboratory of Preparation and Measurement of Building Materials University of JinanJinan 250022China School of Material Science and Engineering University of JinanJinan 250022China No.52 Institute of China North Industry Group Yantai 264003China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China

As a non-toxic copolymer of isobutylene and maleic anhydride,Isobam is successfully used as a dispersant and a gelling agent for fabricating porous Si_(3)N_(4) ceramics by gel *** dispersity and rheological properties of the Si_(3)N_(4) slurry are influenced by the pH,milling time,and Isobam content which varies from 0.1 wt.%to 0.6 wt.%,and these factors are *** slurry with 40 vol.%solid content and milled for 4 h has a high zeta potential at pH 12(adjusted by Tetramethyl ammonium hydroxide(TMAH)),which means that the particles are well *** mechanisms of TMAH are electrostatic repulsion and steric *** viscosity of the slurry increases with the increase of Isobam *** pressureless sintering at 1700℃ for 2 h,a uniform unique interlocking microstructure of rod-like β-Si_(3)N_(4) grains is observed,which may improve the flexural strength of the ceramics by intergranular fracture and particle pullout of β-Si_(3)N_(4) *** density and porosity of the samples fluctuate negligibly with the increase of Isobam content,and the Si_(3)N_(4) ceramic with 0.1 wt.% Isobam exhibits the highest bending strength of 251.6 MPa among all samples.

关键词： Si_(3)N_(4)ceramics Viscosity Zeta potential Gel casting Isobam

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：