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NANO-MICRO LETTERS 2024年第1期16卷 1-17页

作者： Xia, Yongji wang, Le Gao, Guiyang Mao, Tianle wang, zhenjia Jin, Xuefeng Hong, Zheyu Han, Jiajia Peng, Dong-Liang Yue, Guanghui Xiamen Univ Coll Mat Fujian Key Lab Surface & Interface Engn High Perfo State Key Lab Phys Chem Solid Surface Xiamen 361005 Peoples R China

Lithium-oxygen batteries (LOBs) with high energy density are a promising advanced energy storage technology. However, the slow cathodic redox kinetics during cycling causes the discharge products to fail to decompose in time, resulting in large polarization and battery failure in a short time. Therefore, a self-supporting interconnected nanosheet array network NiCo2O4/MnO2 with a Mott-Schottky heterostructure on titanium paper (TP-NCO/MO) is ingeniously designed as an efficient cathode catalyst material for LOBs. This heterostructure can accelerate electron transfer and influence the charge transfer process during adsorption of intermediate by triggering the interface disturbance at the heterogeneous interface, thus accelerating oxygen reduction and oxygen evolution kinetics and regulating product decomposition, which is expected to solve the above problems. The meticulously designed unique structural advantages enable the TP-NCO/MO cathode catalyst to exhibit an astounding ultra-long cycle life of 800 cycles and an extraordinarily low overpotential of 0.73 V. This study utilizes a simple method to cleverly regulate the morphology of the discharge products by constructing a Mott-Schottky heterostructure, providing important reference for the design of efficient catalysts aimed at optimizing the adsorption of reaction intermediates.

关键词： Mott-Schottky heterostructure Lithium-oxygen batteries Electrocatalysts Electrodeposition AIR BATTERIES OXIDE

Constructed Mott-Schottky Heterostructure Catalyst to Trigger Interface Disturbance and Manipulate Redox Kinetics in Li-O2 Battery

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Nano-Micro Letters 2024年第12期 50-66页

作者： Yongji Xia Le wang Guiyang Gao Tianle Mao zhenjia wang Xuefeng Jin Zheyu Hong Jiajia Han Dong-Liang Peng Guanghui Yue State Key Lab of Physical Chemistry of Solid Surface Fujian Key Laboratory of Surface and Interface Engineering for High Performance MaterialsCollege of Materials Xiamen University

Lithium-oxygen batteries（LOBs） with high energy density are a promising advanced energy storage technology. However, the slow cathodic redox kinetics during cycling causes the discharge products to fail to decompose in time, resulting in large polarization and battery failure in a short time. Therefore, a self-supporting interconnected nanosheet array network NiCo2O4/MnO2with a Mott-Schottky heterostructure on titanium paper（TP-NCO/MO） is ingeniously designed as an efficient cathode catalyst material for LOBs. This heterostructure can accelerate electron transfer and influence the charge transfer process during adsorption of intermediate by triggering the interface disturbance at the heterogeneous interface, thus accelerating oxygen reduction and oxygen evolution kinetics and regulating product decomposition, which is expected to solve the above problems. The meticulously designed unique structural advantages enable the TP-NCO/MO cathode catalyst to exhibit an astounding ultra-long cycle life of 800 cycles and an extraordinarily low overpotential of 0.73 V. This study utilizes a simple method to cleverly regulate the morphology of the discharge products by constructing a Mott-Schottky heterostructure, providing important reference for the design of efficient catalysts aimed at optimizing the adsorption of reaction intermediates.

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Preparation and Characterization of MWCNTs/E44

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Journal of Materials Science & Technology 2006年第1期22卷 117-122页

作者： Yan GAO zhenjia wang Rui wang Ji LIANG Luke wang State Key Laboratory of Tribology Department of Mechanical Engineering Tsinghua UniversityBejing 100084China

Epoxy resin was modified by multi-walled carbon nanotubes（MWCNTs）with an in situ *** composite was observed using scanning electron microscopy （SEM）and X-ray diffraction （XRD）,and its abrasive wear resistance and tensile properties were *** results show that the function groups found on the surface of MWCNTs helped to improve the resin＇s crack resistance,and the cracks were found notably reduced in the *** the resin and MWCNTs were bonded physically ,the tensile properties and wear resistance of the composite were improved notably when an optimum amount of MWCNTs were filled in Epilote-44（E44）.When 5wt pct acidified MWCNTs were filled in E44,the elastic modulus ,breaking strength and wear resistance of the composite increase to 226.7%,303.3%and 272.55%（153.29%）,respectively.

关键词： Epoxy resin Multi-walled carbon nanotubes(MWCNTs) Tensile properties Wear resistance

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多路交叉口更新改造交通组织研究

市政技术 2024年第4期42卷 140-146页

作者：王振佳吴云鹏肖书影肖阳北京市工程咨询有限公司北京100124 北京市交通基础设施建设项目管理中心北京100161 北京市市政专业设计院股份公司北京100037

为提升多路交叉口安全水平与运行效率,首先分析总结了多路交叉口的道路特征,提出了多路交叉口改造更新的交通组织原则;然后将上述原则组合运用于北京市房山区某典型多路交叉口,设计了4种改造方案,从安全性、运行效率、投资和交通功能4... 详细信息

为提升多路交叉口安全水平与运行效率,首先分析总结了多路交叉口的道路特征,提出了多路交叉口改造更新的交通组织原则;然后将上述原则组合运用于北京市房山区某典型多路交叉口,设计了4种改造方案,从安全性、运行效率、投资和交通功能4个角度对各方案进行了评分,再采用竞争态势矩阵计算了各方案的综合得分,并分析了各方案的优势;最终确定了推荐方案。该研究成果可为多路交叉口的梳堵提供借鉴。

关键词：多路交叉口更新改造交通组织多方案比选竞争态势矩阵

Recent progress in visualization and digitization of coherent transformation structures and application in high-strength steel

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International Journal of Minerals,Metallurgy and Materials 2024年第6期31卷 1298-1310页

作者： Xuelin wang zhenjia Xie Xiucheng Li Chengjia Shang Collaborative Innovation Center of Steel Technology University of Science and Technology BeijingBeijing 100083China State Key Laboratory for Advanced Metals and Materials University of Science and Technology BeijingBeijing 100083China Yangjiang Branch Guangdong Laboratory for Materials Science and Technology(Yangjiang Advanced Alloys Laboratory)Yangjiang 529500China

High-strength steels are mainly composed of medium-or low-temperature microstructures,such as bainite or martensite,with coherent transformation *** type of microstructure has a high density of dislocations and fine crystallographic structural units,which ease the coordinated matching of high strength,toughness,and ***,given its excellent welding perform-ance,high-strength steel has been widely used in major engineering constructions,such as pipelines,ships,and ***,visual-ization and digitization of the effective units of these coherent transformation structures using traditional methods(optical microscopy and scanning electron microscopy)is difficult due to their complex ***,the establishment of quantitative relationships with macroscopic mechanical properties and key process parameters presents additional *** article reviews the latest progress in microstructural visualization and digitization of high-strength steel,with a focus on the application of crystallographic methods in the development of high-strength steel plates and *** obtained the crystallographic data(Euler angle)of the transformed microstruc-tures through electron back-scattering diffraction and combined them with the calculation of inverse transformation from bainite or martensite to austenite to determine the reconstruction of high-temperature parent austenite and orientation relationship(OR)during con-tinuous cooling ***,visualization of crystallographic packets,blocks,and variants based on actual OR and digit-ization of various grain boundaries can be effectively completed to establish quantitative relationships with alloy composition and key process parameters,thereby providing reverse design guidance for the development of high-strength steel.

关键词： high-strength steel microstructure visualization digitization quantification mechanical properties

Influence of the electric field on carriers recombination zone in bilayer organic electroluminescent device

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Chinese Science Bulletin 2000年第17期45卷 1623-1628页

作者： Shengyi Yang zhenjia wang Zheng Xu Xiaohong Chen Yanbing Hou Xurong Xu No Jiaotong Univ Inst Optoelect Technol Beijing 100044 Peoples R China

The electroluminescence (EL) of bilayer devices (ITO/Polymer/Alqa/AI) made from two PPV derivatives (MN-PPV and MEH-PPV), respectively, and the influence of the organic layers’ thickness on the characteristics of the device are investigated. Different spectra and variations are observed for different thicknesses of Alq3 layer in this bilayer organic light-emitting diodes (LEDs) as increasing applied bias. Based on the energy level and field-assisted tunneling at the interface, we attributed these phenomena to electric field redistribution in the device and field-assisted charges being transported and tunneling through energy barrier at high electric field.

关键词： electroluminescence bilayer devices recombination zone carriers.

A Study on the Wear Resistance of Nano-Material/E51

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Journal of Materials Science & Technology 2004年第3期20卷 340-343页

作者： Yan GAO zhenjia wang Quanyu MA Ge TANG Ji LIANG State Key Laboratory of Tribology, Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China Lab. of Tribology Dept. of Mech. Eng. Tsinghua Univ. Beijing 100084 China

Epoxy resin modified by nanometric γ-alumina or multi-walled carbon nanotubes (MCNTs) was prepared with solution mixingmethod, and the wear resistance of the composite was studied. The results show that when an optimum amount of nanometricalumina or MCNTs is filled in epikote51 (E51), the wear resistance of the composite will increase. When 8 wt pct nanometricγ-alumina is filled in E51, the wear resistance of the composite increases to 230%. When 10% MCNTs is filled in E51, thewear resistance of the composite increases to 226%. When nanometric alumina is filled in, the wear resistance of modifiedepikote51 will increase as the cure temperature is heightened.

关键词： Epoxy resin Nanometric γ-alumina Multi-walled carbon nanotubes (MCNTs) Wear resistance

Two-Dimensional van der Waals Superconductor Heterostructures:Josephson Junctions and Beyond

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Precision Chemistry 2024年第7期2卷 273-281页

作者： Chao wang zhenjia Zhou Libo Gao National Laboratory of Solid State Microstructures Jiangsu Key Laboratory for NanotechnologySchool of Physics Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210093China

The past few years have witnessed prominent progress in two-dimensional(2D)van der Waals *** assembled in an artificial manner,these atomically thin layers possess distinctive electronic,magnetic,and other properties,which have provided a versatile platform for both fundamental exploration and practical applications in condensed matter physics and materials *** various potential combinations,a particular set of van der Waals superconductor(SC)heterostructures,which is realized by stacking fabrication based on two-dimensional SCs,is currently attracting intense *** example,the Josephson junction,a specific structure in which a nonsuperconducting barrier is inserted between two proximity-coupled SCs,shows phenomena and outstanding properties with atomic-scale *** this Perspective,we first review this emerging research area of van der Waals SC heterostructures,especially progress on the 2D van der Waals Josephson junctions,from the aspects of preparation,performance,and application,and also propose our vision for the future direction and potential innovation opportunities.

关键词： two-dimensional van der Waals heterostructures superconductor Josephson junctions transition metal dichalcogenides

Design Principles and Mechanistic Understandings of Non-Noble-Metal Bifunctional Electrocatalysts for Zinc-Air Batteries

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Nano-Micro Letters 2024年第9期16卷 13-48页

作者： Yunnan Gao Ling Liu Yi Jiang Dexin Yu Xiaomei Zheng Jiayi wang Jingwei Liu Dan Luo Yongguang Zhang zhenjia Shi Xin wang Ya‑Ping Deng Zhongwei Chen Power Battery and Systems Research Center State Key Laboratory of CatalysisDalian Institute of Chemical PhysicsDalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023People’s Republic of China Department of Chemical Engineering University of WaterlooWaterlooON N2L 3G1Canada Institute of Carbon Neutrality Zhejiang Wanli UniversityNingbo 315100People’s Republic of China College of Materials and Chemistry China Jiliang UniversityHangzhou 310018People’s Republic of China

Zinc-air batteries(ZABs)are promising energy storage systems because of high theoretical energy density,safety,low cost,and abundance of ***,the slow multi-step reaction of oxygen and heavy reliance on noble-metal catalysts hinder the practical applications of ***,feasible and advanced non-noble-metal elec-trocatalysts for air cathodes need to be identified to promote the oxygen catalytic *** this review,we initially introduced the advancement of ZABs in the past two decades and provided an overview of key developments in this ***,we discussed the work-ing mechanism and the design of bifunctional electrocatalysts from the perspective of morphology design,crystal structure tuning,interface strategy,and atomic *** also included theoretical studies,machine learning,and advanced characterization technologies to provide a comprehensive understanding of the structure-performance relationship of electrocatalysts and the reaction pathways of the oxygen redox ***,we discussed the challenges and prospects related to designing advanced non-noble-metal bifunctional electrocatalysts for ZABs.

关键词： Zinc-air batteries Bifunctional electrocatalysts Design principles Mechanistic understandings

焦点位置的确定和H62黄铜激光焊接性的研究

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热加工工艺 2008年第7期37卷 58-60页

作者：朱传运王振家东北大学材料与冶金学院辽宁沈阳110004 清华大学机械工程系北京100084

研究了在不同焦点位置条件下激光焊接参数对H62黄铜焊缝金属的组织、硬度、化学成分、内部缺陷和焊态接头断裂强度的影响。结果表明,焦点位置是试板能否焊透的决定因素之一。一般情况下,激光焊接中首选焦点位置为零是适宜的。焦点位置对... 详细信息

研究了在不同焦点位置条件下激光焊接参数对H62黄铜焊缝金属的组织、硬度、化学成分、内部缺陷和焊态接头断裂强度的影响。结果表明,焦点位置是试板能否焊透的决定因素之一。一般情况下,激光焊接中首选焦点位置为零是适宜的。焦点位置对H62黄铜的接头(或焊缝金属)的性能和缺陷等具有重要影响,可以据此调节焦点位置。激光焊不是黄铜焊接的首选焊接方法。激光焊接H62时必须正确地控制焊接线能量范围和选择焦点位置。

关键词：激光焦点位置 H62黄铜焊接性