Author Affiliations
Abstract
1 State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, People’s Republic of China
2 College of Chemistry and Materials Science, Fujian Normal University, Fuzhou 350117, People’s Republic of China
3 State Key Laboratory of ASIC and System, Shanghai Institute of Intelligent Electronics and Systems, School of Microelectronics, Fudan University, Shanghai 200433, People’s Republic of China
4 ShenSi Lab, Shenzhen Institute for Advanced Study, University of Electronic Science and Technology of China, Shenzhen 518110, People’s Republic of China
Single-atom catalysts (SACs) have garnered increasingly growing attention in renewable energy scenarios, especially in electrocatalysis due to their unique high efficiency of atom utilization and flexible electronic structure adjustability. The intensive efforts towards the rational design and synthesis of SACs with versatile local configurations have significantly accelerated the development of efficient and sustainable electrocatalysts for a wide range of electrochemical applications. As an emergent coordination avenue, intentionally breaking the planar symmetry of SACs by adding ligands in the axial direction of metal single atoms offers a novel approach for the tuning of both geometric and electronic structures, thereby enhancing electrocatalytic performance at active sites. In this review, we briefly outline the burgeoning research topic of axially coordinated SACs and provide a comprehensive summary of the recent advances in their synthetic strategies and electrocatalytic applications. Besides, the challenges and outlooks in this research field have also been emphasized. The present review provides an in-depth and comprehensive understanding of the axial coordination design of SACs, which could bring new perspectives and solutions for fine regulation of the electronic structures of SACs catering to high-performing energy electrocatalysis.
Nano-Micro Letters
2023, 15(1): 228
1 辽宁工业大学工程训练中心, 辽宁 锦州 121001
2 辽宁工业大学机械工程与自动化学院, 辽宁 锦州 121001
3 锦州添赢机电产品有限公司, 辽宁 锦州 121001
针对高速钢刀具在高速切削、高硬材料切削时硬度及红硬性不足的问题, 采用激光熔覆技术在M2高速钢车刀上制备WC/Co熔覆层以改善刀具性能。研究了不同预加工形貌对熔覆层的影响, 对熔覆过程中车刀刃倾角角度差异性问题提出了解决方法, 并对熔覆后刀具进行了实际切削性能验证。结果表明, 预置坡口熔覆为相对理想的预加工形貌, 所得熔覆层的显微硬度较车刀基体提高了近57%, 600 ℃时熔覆层红硬性提高了0.25倍, 且熔覆层在1 000 ℃时红硬性达到了50 HRC以上, 设计专用熔覆翻转夹具可以有效的调整刀具刃倾角角度。熔覆后车刀在高硬材料和高速切削中展现出优良的实用性能。
激光熔覆 预加工形貌 熔覆夹具 红硬性 熔覆切削验证 高速钢刀具 laser cladding pre-processing morphology cladding fixture red hardness cladding cutting verification high speed steel tool
Author Affiliations
Abstract
1 Institute of Particle and Two-Phase Flow Measurement/Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
2 Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, Southeast University, Nanjing 210096, China
A method to three-dimensional position moving particles with one lens and two cameras is proposed. Two particle images with different degrees of defocusing are adopted to solve the ambiguous problem of particle positions. A single-lens dual-camera system is developed to simultaneously capture these two images for the moving particles. The measurement principles and theoretical analysis are introduced first, and then simulated investigations and experimental research are discussed. The measurement errors in the simulations and experiments are less than 1% and 4%, respectively, in 20 times the depth of field of the system, which validates the feasibility of this method.
120.4640 Optical instruments 110.2970 Image detection systems 000.3110 Instruments, apparatus, and components common to the sciences Chinese Optics Letters
2016, 14(3): 031201
Author Affiliations
Abstract
Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, China
This Letter is concerned with the influence of polarization on the damage performance of type I doubler potassium dihydrogen phosphate crystals grown by the conventional growth method under 532 nm pulse irradiation. Pinpoint density (ppd) and the size distribution of pinpoints are extracted through light scattering pictures captured by microscope. The results show that the ppd of polarization that parallels the extraordinary axis is around 1.5× less than that of polarization that parallels the ordinary axis under the same fluence, although polarization has no influence on size distribution of pinpoints. We also find that the size distribution is independent of fluence, although the number of pinpoints grows with fluence.
160.4330 Nonlinear optical materials Chinese Optics Letters
2016, 14(5): 051601
西北工业大学, 凝固技术国家重点实验室, 陕西 西安710072
采用激光拉曼光谱仪和扫描电子显微镜对以C2H2+H2和C2H2+C3H8+Ar为反应气体, 通过直流加热化学气相沉积工艺在SiC纤维表面制备的碳涂层的微观结构及断口形貌进行了研究。 结果表明, 两种碳涂层的拉曼光谱中1 350, 1 400～1 500和1 600 cm-1附近均观察到D, D”和G特征峰的存在。 碳涂层具有类似石墨的片层结构, 结构中微晶的排列显示出一定的无序性, 并含有少量非晶态碳。 随着沉积温度的升高, 微晶尺寸有所增加, 结构中的均匀性和有序度也得到改善。 断口观察发现, 采用C2H2+H2制备的碳涂层平整、 致密; 而由C2H2+C3H8+Ar得到的碳涂层呈曲折的层片状。 分析表明, 这主要与结构中的有序度和均匀性有关。
化学气相沉积 碳涂层 拉曼光谱 微观结构 Chemical vapor deposition C coating Raman spectrum Microstructure 光谱学与光谱分析
2012, 32(12): 3253
西安工业大学光电微系统研究所, 陕西 西安 710032
在比较几种探测器集成制造方法的基础上，提出采用各向异性导电膜作为电信号互联的手段，实现热释电探测器与信号处理电路的混合集成，从而演示了一种兼容性良好的集成化多传感器制造方法。对单晶钽酸锂热释电探测器采取机械研磨减薄获得其薄膜，利用3M的5552R各向异性导电膜，实现了探测器与信号读出电路的互联。对探测器的测试表明：机械研磨减薄获得的钽酸锂薄膜表现出与晶体接近的热释电特性，探测器表现出良好的绝热性质和动态响应特性。
各向异性导电膜 多传感器 混合集成 热释电探测器 anisotropic conductive tape multi-sensor hybrid integration pyroelectric detector
