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Insight into the boosted activity of TiO2–CoP composites for hydrogen evolution reaction:Accelerated mass transfer,optimized interfacial water,and promoted intrinsic activity

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Journal of Energy Chemistry 2022年第11期31卷 111-120,I0005页

作者： Mingming Deng Hongmei Yang Lishan Peng Ling Zhang Lianqiao Tan Guiju He Minhua Shao Li Li Zidong Wei The State Key Laboratory of power Transmission Equipment&System Security and New Technology Chongqing Key Laboratory of Chemical Process for Clean Energy and Resource UtilizationCollege of Chemistry and Chemical EngineeringChongqing UniversityChongqing 400044China department of Chemical and Biological Engineering Hong Kong University of Science and TechnologyClear Water BayKowloonHong Kong 999077China

The use of abundant elements in the earth as electrocatalytic hydrogen production catalysts is of great significance for hydrogen energy ***,we report amorphous TiO_(2)-decorated CoP/NF(TiO_(2)–CoP/NF)as an excellent electrocatalyst for alkaline hydrogen evolution reaction(HER).The welldispersed amorphous TiO_(2)on nanoneedle-like CoP arrays preserves the crystal structure of CoP and changes its electronic structure by interfacial charge *** to CoP/NF catalyst,the Ti O_(2)–CoP/NF composite catalyst exhibits high HER activity with an overpotential of 61 mV at 10 mA cm^(-2)and high ***,it almost maintains the Volmer step as a rate-determining step(RDS)and the Tafel slope at a wide cathodic potential range showing the fast kinetics under large polarization *** simulations reveal that the combination of TiO_(2)and CoP selectively accelerates the hydrated K+diffusion,regulates the interfacial water orientation to adapt to the subsequent smooth water dissociation,and optimizes*H adsorption/H_(2)*** strengthened coupling of HER multi-scale-processes on transition metal compound composites catalysts is the underlying mechanism for improving HER activity.

关键词： Alkaline water electrolysis Transition metal compound Composite catalysts HER Density functional theory

Computer aided engineering analysis and design optimization of rotary tillage tool components

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International Journal of Agricultural and Biological Engineering 2011年第3期4卷 1-6页

作者： Gopal U.Shinde Shyam R.Kajale department of Farm Machinery and power College of Agricultural Engineering and TechnologyMarathwada Agricultural UniversityParbhani(M.S.)India Shri Guru Gobind Singhji Institute of Engineering and Technology VishnupuriNanded(M.S.)India

The computer aided engineering analysis and design optimization of rotary tillage tool on the basis of finite element method and simulation method is done by using CAD-software for the structural *** different tillage tool parts of rotary tillage tools are geometrically constructed as a solid *** actual field performance rating parameters along with boundary conditions are set in the software for 35 hp and 45 hp *** estimated forces acting on soil-tool interface are fed into software as a loading *** resultant effects of loading condition on tillage blade and whole rotavator assembly were obtained from stress distribution and deformations *** proposed working results in identifying sufficient tolerance in changing the dimensions of rotavator frame sections and side gear box for removing the excess weight in a solid section and also to raise the weight of blade for a reliable *** present working model with tillage blade is analysed to new design constraints with change of its geometry for the maximum weed removal efficiency by presenting its practical results from the field performance.

关键词： rotary tillage tool simulation FEM design analysis stress deformation rotavator

Optimization of Added Permanent Magnet Amount in Synchronous Reluctance Machines for High Performance

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Tsinghua Science and Technology 1998年第3期3卷 87-92页

作者：赵争鸣 department of Electrical Engineering Tsinghua University Beijing 100084 Delphi power Propulsion System General Motor Corporation USA

An optimizing method of adding permanent magnet into synchronous reluctance machines for high performance is presented. The method enables torque components from reluctance and permanent magnet to reach an optimal combination so as to obtain a maximum efficiency, higher power factor in a wider speed range. Capability curves of synchronous reluctance combined with permanent magnet (SR PM) machines are described for different quantities of permanent magnet. The interacting principle of reluctance and permanent magnet torque is discussed. Simulation results based on an integrated model of the SR PM machine with a controller are presented to demonstrate the interaction of the two kinds of torques. Particularly, efficiency contours over the capability curves are illustrated to show the effect of added permanent magnet amount. An optimizing criterion for added permanent magnet amount in SR PM machine design is developed. Compared to induction, pure synchronous reluctance, and non optimized SR PM machines with same stator, the optimized SR PM machine shows higher efficiency in a wider speed range. 

关键词： synchronous reluctance permanent magnet electric machine optimization

Homogeneous permeation and oriented crystallization in nanostructured mesopores for efficient and stable printable mesoscopic perovskite solar cells

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Science China Chemistry 2024年

作者： Guodong Zhang Yanjie Cheng Tingting Niu Ziwei Zheng Zongwei Li Junwei Xiang Qiaojiao Gao Minghao Xia Lijuan Guo Yiming Liu Mengru Zhang Yiran Tao Xueqin Ran Mingjie Li Guichuan Xing Yingdong Xia Lingfeng Chao Anyi Mei Hongwei Han Yonghua Chen Key Laboratory of Flexible Electronics (KLoFE) and Institute of Advanced Materials (IAM) School of Flexible Electronics (Future Technologies) Nanjing Tech University Michael Gr?tzel Center for Mesoscopic Solar Cells Wuhan National Laboratory for Optoelectronics Key Laboratory of Materials Chemistry for Energy Conversion and Storage of Ministry of Education Huazhong University of Science and Technology department of Physics The Chinese University of Hong Kong department of Applied Physics The Hong Kong Polytechnic University Shenzhen Research Institute The Hong Kong Polytechnic University Joint Key Laboratory of the Ministry of Education Institute of Applied Physics and Materials Engineering University of Macau

The low-cost and scalable printable mesoporous perovskite solar cells(p-MPSCs) face significant challenges in regulating perovskite crystal growth due to their nanoscale mesoporous scaffold structure, which limits the improvement of device power conversion efficiency(PCE). In particular, the most commonly used solvents, N,N-dimethylformamide(DMF) and dimethyl sulfoxide(DMSO), have a single chemical interaction with the precursor components and high volatility, which is insufficient to self-regulate the perovskite crystallization process, leading to explosive nucleation and limited growth within mesoporous scaffolds. Here, we report a mixed solvent system composed of methylamine formaldehyde(MAFa)-based ionic liquid and acetonitrile(ACN) with the strong C=O–Pb coordination and N–H···I hydrogen bonding with perovskite components. We found that the mixed solvent system is beneficial for the precursor solution to homogeneously penetrate into the mesoporous scaffold,and the strong C=O–Pb coordination and N–H···I hydrogen bonding interaction can promote the oriented growth of perovskite crystals. This synergistic effect increased the PCE of the p-MPSCs from 17.50% to 19.21%, which is one of the highest records for p-MPSC in recent years. Additionally, the devices exhibit positive environmental stability, retaining over 90% of the original PCE after 1,200 h of aging under AM 1.5 illumination conditions at 55 °C and 55% humidity.

关键词：

Advanced Computer-aided Design and Analysis for Synchronous Reluctance-Permanent Magnet Machines

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Tsinghua Science and Technology 1998年第3期3卷 93-98页

作者：赵争鸣 department of Electrical Engineering Tsinghua University Beijing 100084 Delphi power Propulsion System General Motor Corporation USA

This paper presents an advanced computer aided design (CAD) package for the synthesis, analysis, and optimization of synchronous reluctance combined with permanent magnet (SR PM) machines. The distinguishing features of the CAD package are that it allows a wide range of design options and parameter variations for the new type of machines, calculations of optimization for maximum efficiency and higher power density, and various performance. The package as described in the main text permits the integration of the machine design with an electronic controller, along with the simulation of the whole system. Through the optimal design, characteristic calculations, and system simulations, the CAD package offers a superior design for the SR PM machines, and presents a feasibility frontier outlined by the design. 

关键词： synchronous reluctance machine permanent magnet machine computer aided design

Designing Advanced Liquid Electrolytes for Alkali Metal Batteries:Principles,Progress,and Perspectives

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Energy & Environmental Materials 2023年第2期6卷 353-380页

作者： Wanming Teng Junxiong Wu Qinghua Liang Jiaojiao Deng Yu Xu Qiong Liu Biao Wang Ting Ma Ding Nan Jun Liu Baohua Li Qingsong Weng Xiaoliang Yu College of Chemistry and Chemical Engineering Inner Mongolia UniversityHohhot 010021China Inner Mongolia Key Laboratory of Graphite and Graphene for Energy Storage and Coating School of Materials Science and EngineeringInner Mongolia University of TechnologyHohhot 010051China department of Mechanical Engineering Research Institute for Smart EnergyThe Hong Kong Polytechnic UniversityHong KongChina College of Environmental Science and Engineering Fujian Normal UniversityFuzhou 350007China department of Chemical Engineering The University of MelbourneParkville VIC 3010Australia Shenzhen Key Laboratory on power Battery Safety and Shenzhen Geim Graphene Center Tsinghua Shenzhen International Graduate School(SIGS)Shenzhen 518071China Inner Mongolia Enterprise Key Laboratory of High Voltage and Insulation Technology Inner Mongolia Electric Power(Group)Co.LtdHohhot 010020China

The ever-growing pursuit of high energy density batteries has triggered extensive efforts toward developing alkali metal(Li,Na,and K)battery(AMB)technologies owing to high theoretical capacities and low redox potentials of metallic ***,for new battery systems,the electrolyte design is critical for realizing the battery electrochemistry of *** electrolytes in alkali ion batteries are generally unsuitable for sustaining the stability owing to the hyper-reactivity and dendritic growth of alkali *** this review,we begin with the fundamentals of AMB *** advancements in concentrated and fluorinated electrolytes,as well as functional electrolyte additives for boosting the stability of Li metal batteries,are summarized and discussed with a special focus on structure-composition-performance *** then delve into the electrolyte formulations for Na-and K metal batteries,including those in which Na/K do not adhere to the Li-inherited ***,the challenges and the future research needs in advanced electrolytes for AMB are *** comprehensive review sheds light on the principles for the rational design of promising electrolytes and offers new inspirations for developing stable AMBs with high performance.

关键词： advanced liquid electrolytes alkali metal batteries concentrated and fluorinated electrolytes functional electrolyte additives

One-step method to simultaneously synthesize separable Te and GeTe nanosheets

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Nano Research 2022年第7期15卷 6736-6742页

作者： Yuyu Yao Xueying Zhan Chuyun Ding Feng Wang Yanrong Wang Jia Yang Zhenxing Wang Jun He CAS Center for Excellence in Nanoscience CAS Key Laboratory of Nanosystem and Hierarchical FabricationNational Center for Nanoscience and TechnologyBeijing 100190China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China Sino-Danish College University of Chinese Academy of SciencesBeijing 100049China department of Physics Shanghai Key Laboratory of Materials Protection and Advanced Materials in Electric PowerShanghai University of Electric PowerShanghai 200090China Key Laboratory of Artificial Micro-and Nano-Structures of Ministry of Education School of Physics and TechnologyWuhan UniversityWuhan 430072China Sino-Danish Center for Education and Research Beijing 100049China

The chemical vapor deposition(CVD)method has been widely used to synthesize high-quality two-dimensional(2D)***,just one type of product can be synthesized by general CVD at one ***,we demonstrate a one-step CVD method to simultaneously grow two types of ***,the products can be completely separated by selecting the deposition *** detail,the controllable and completely separable growth forα-GeTe and Te nanosheets was realized by using one precursor-GeTe powder through the atmospheric pressure CVD(APCVD)*** crystal quality of the as-grownα-GeTe nansosheets and Te nanosheets have been proved by the high-resolution transmission electron microscopy(HRTEM)***,the field-effect-transistor(FET)based onα-GeTe nanosheet manifests that the as-grownαGeTe nanosheet is a degenerate semiconductor due to the intrinsic Ge ***,Te-based FET devices indicate that the good electrical performance of the as-grown Te nanosheet,such as high mobility of 900 cm2·V^(−1)·s^(−1)(at room temperature),high on/off ratio of>106(at 77 K),and good *** developed one-step CVD method shows the huge potentials for high-efficiency and high-quality material growth.

关键词： controllable growth completely separable growth α-GeTe crystal Te crystal high mobility

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考虑表面张力的球泡运动的理论解研究

Acta Mechanica Sinica 2023年第6期39卷 22-30页

作者：郭凯涛赵迪张凌新 State Key Laboratory of Fluid power and Mechatronic Systems Department of Engineering MechanicsZhejiang UniversityHangzhou 310027China Xi’an Aerospace Propulsion Test Technology Institute Xi’an 710000China

Rayleigh-Plesset方程是气泡动力学的基本模型,被广泛应用于空化机理的研究中.由于空化气泡经常发生在微观尺度上,表面张力的影响将对气泡的运动产生重要的影响.基于Sundman变换和Weierstrass椭圆函数理论,研究了考虑表面张力的Rayleigh... 详细信息

Rayleigh-Plesset方程是气泡动力学的基本模型,被广泛应用于空化机理的研究中.由于空化气泡经常发生在微观尺度上,表面张力的影响将对气泡的运动产生重要的影响.基于Sundman变换和Weierstrass椭圆函数理论,研究了考虑表面张力的Rayleigh-Plesset方程,并分别建立了蒸汽气泡和气泡的参数理论解.结果表明,蒸汽泡和气体泡动力学方程可以从理论上得到求解.在理论解的基础上,进一步研究了表面张力对蒸汽气泡和气泡运动的影响.对于这两种气泡,随着气泡尺度的减小,表面张力对气泡运动的影响会逐渐增大.特别是当气泡尺度减小到10μm时,表面张力的影响变得更加显著,不可忽略.

关键词： Weierstrass椭圆函数气泡动力学空化气泡表面张力气泡运动空化机理 Rayleigh 微观尺度

基于两级模糊控制器的独立负载液压系统的压力流量复合控制特性研究（英文）

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2019年第3期20卷 184-200页

作者： Qi ZHONG Bin ZHANG Hui-ming BAO Hao-cen HONG Ji-en MA Yan REN Hua-yong YANG Rong-fong FUNG State Key Laboratory of Fluid power and Mechatronic Systems Zhejiang University College of Mechanical and Electrical Engineering Wenzhou University department of Mechanical and Automation Engineering Kaohsiung First University of Science and Technology

目的:常规负载口独立控制研究多采用商业阀进行,因其阀芯位移控制器为封闭式结构,所以阀芯位移的动态特性难以调整,进而影响了系统的压力和流量控制性能。本文旨在探讨负载口独立控制系统中阀芯位移特性对系统压力和流量控制的影响,并... 详细信息

目的:常规负载口独立控制研究多采用商业阀进行,因其阀芯位移控制器为封闭式结构,所以阀芯位移的动态特性难以调整,进而影响了系统的压力和流量控制性能。本文旨在探讨负载口独立控制系统中阀芯位移特性对系统压力和流量控制的影响,并研究提高系统压力和流量控制性能的方法。创新点:1.设计基于两级模糊比例积分微分(PID)的压力和流量控制器;2.设计基于阀芯位移反馈的流量控制器;3.建立试验模型,成功实现液压系统高动态压力流量复合控制。方法:1.通过理论分析得到影响系统压力和流量的关键因素(公式(9)和(13));2.提出位移控制为内环、压力和流量控制为外环的两级模糊PID控制算法,并开发相应的控制系统(图2～4);3.通过仿真和实验分析,验证本文提出的控制器所具有的阀芯位移、系统压力和流量的控制效果(图13～18)。结论:1.两级模糊PID控制器具有较好的系统压力和流量控制效果;2.基于阀芯位移反馈的流量控制器具有较高的流量控制精度;3.运用本文设计的可编程控制系统进行液压系统的压力流量复合控制,稳定时间小于200 ms,使系统动态特性得到提高。

关键词：独立负载系统压力流量复合控制计算流量反馈模糊PID 两级闭环控制