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Plasma characteristics and material erosion mechanism in multi-channel wire electrical discharge machining

Chinese Journal of Aeronautics 2024年第10期37卷 508-525页

作者： Guokang SU Chuanyun ZHANG Junfei LI Xiaolei CHEN Guixian LIU Yongjun ZHANG State Key Laboratory of Precision Electronic Manufacturing Technology and Equipment Guangdong University of TechnologyGuangzhou 510006China Guangdong Key Laboratory of Advanced Manufacturing Technology of Marine Energy Equipment Guangdong University of TechnologyGuangzhou 510006China Guangzhou Key Laboratory of Nontraditional Machining Technology and Equipment Guangdong University of TechnologyGuangzhou 510006China School of Mechanical Engineering Xi’an Technological UniversityXi’an 710021China

Multi-channel wire electrical discharge machining(MC-WEDM)is an advanced and high-efficiency machining technology,but its material erosion mechanism remains *** this study,dual-channel wire electrical discharge machining was utilized as a case study to investigate the impact of the plunging current on both the plasma characteristics and material erosion under complex discharge *** analysis was conducted on the charged particles in the plasma,revealing that the plunging current can influence the trajectory of the plasma by modifying the selfmagnetic *** particle tracking method was employed to simulate the motion of electrons,revealing that in MC-WEDM,electrons exhibited a larger and more uniform *** evolution of the plasma within a single-pulse discharge was observed using high-speed photography technology,and the discharge signals collected from different channels were *** was observed that the plasma in MC-WEDM experienced more intense back-and-forth sweeping on the workpiece surface,facilitating the ejection of molten metal from the molten *** oscillating plasma exhibits a larger processing area and a more uniform distribution of energy,resulting in the formation of larger and shallower discharge ***,the influence of the amplitude and time point of the plunging current on the volume and area of the discharge craters was ***,MC-WEDM significantly reduced the occurrence of holes and micro-cracks and exhibited a thinner recast layer in the continuous discharge experiment.

关键词： Multi-channel WEDM Discharge observation Plunging current Plasma characteristics Material erosion Discharge crater

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Sp/sp^(2)carbon ratio-driven high-throughput screening of electrocatalytic nitrogen reduction performance on transition metal single-atom catalysts

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Rare Metals 2024年第11期43卷 5781-5791页

作者： Ze-Xiang Yin Yu-Dan Li Yu-Huan Ye Yuan Liu Mian-Feng Li Zi-Jun Yang Xue-Rong Zheng Hao-Zhi Wang Yang Wang Yi-Da Deng State Key Laboratory of Marine Resource Utilization in South China Sea School of Materials Science and EngineeringHainan UniversityHaikou 570100China School of Materials Science and Engineering Tianjin Key Laboratory of Composite and Functional MaterialsKey Laboratory of Advanced Ceramics and Machining Technology(Ministry of Education)Tianjin UniversityTianjin 300072China

Single-atom catalysts(SACs)have been widely utilized in electrochemical nitrogen reduction reactions(NRR)due to their high atomic utilization and *** to the unique sp/sp^(2)co-hybridization,graphyne materials can offer stable adsorption sites for single metal *** investigate the influence of the sp/sp^(2)hybrid carbon ratio on the electrocatalytic NRR performance of graphyne,a high-throughput screening of 81 catalysts,with27 transition metals loaded on graphyne(GY1),graphdiyne(GY2),and graphtriyne(GY3),was conducted using firstprinciples *** results of the screening revealed that Ti@GY3 exhibits the lowest energy barrier for the rate-determining step(0.32 eV)in ***,to explore the impact of different sp/sp^(2)-hybridized carbon ratios on the catalytic activity of SACs,the mechanism of nitrogen(N_(2))adsorption,activation,and the comprehensive pathway of NRR on Ti@GY1,Ti@GY2,and Ti@GY3 was systematically *** was found that the ratio of sp/sp^(2)-hybridized carbon can significantly modulate the d-band center of the metal,thus affecting the energy barrier of the rate-determining step in NRR,decreasing from Ti@GY1(0.59 eV)to Ti@GY2(0.49 eV);and further to Ti@GY3(0.32 eV).Additionally,the Hall conductance was found to increase with the bias voltage in the range of 0.4-1 V,as calculated by Nanodcal software,demonstrating an improvement in the conductivity of the *** summary,this work provides theoretical guidance for modulating the electrocatalytic nitrogen reduction activity of SACs by varying the ratio of sp/sp^(2)hybrid carbon,with Ti@GY3 showing potential as an excellent NRR catalyst.

关键词： Nitrogen reduction reactions Single-atom catalysts Graphyne Ratio of sp/sp^(2)hybrid carbon High-throughput screening

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Sulfate-assisted Ni/Fe-based electrodes for anion exchange membrane saline splitting

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Nano Research 2024年第7期17卷 5985-5995页

作者： Yujun Han Li Shao Yuhang Liu Guodong Li Tongzhou Wang Xuerong Zheng Jihong Li Xiaopeng Han Wenbin Hu Yida Deng School of Materials Science and Engineering Key Laboratory of Advanced Ceramics and Machining Technology of Ministry of EducationTianjin UniversityTianjin 300072China State Key Laboratory of Marine Resource Utilization in South China Sea School of Materials Science and EngineeringHainan UniversityHaikou 570228China State Key Laboratory of Inorganic Synthesis and Preparative Chemistry College of ChemistryJilin UniversityChangchun 130012China Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education) Nankai UniversityTianjin 300071China

Saline water electrolysis is an appealing strategy for hydrogen production,attracting more attention in recent ***-based electrodes exhibit promise as catalysts for saline water ***,they suffer from the inferior service life of the oxygen evolution reaction(OER).Herein,we report an oxygen-evolution electrode consisting of a sulfate-modulated nickel-iron hydroxide(NiFeOOH)affording as the catalytic active layer and Fe-Ni_(3)S_(2) as the corrosion-proof *** developed electrode only requires overpotentials of 220 and 292 mV to deliver the current density of 10 and 500 mA·cm^(−2),*** importantly,it presents long-term stability exceeding 140 and 100 h in 1 M KOH at high current densities of 500 and 1000 mA·cm^(−2),respectively,as well as 120 h for saline water electrolysis at 100 mA·cm^(−2).Experimental results reveal that the generated sulfate plays an indispensable role in improving stability and corrosion *** assembled and tested an anion exchange membrane electrolyzer with Pt/C and NiFeS/NIF as the cathode and anode,respectively,under industrial *** overall water-splitting electrolyzer achieves an impressive energy conversion efficiency of 75%±0.5%.This report offers fresh insights into the design of stable NiFe-based electrodes,which may further promote its practical applications for saline water electrolysis.

关键词： saline water electrolysis oxygen evolution reaction anode material water splitting

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Regulating the electromagnetic balance of materials by electron transfer for enhanced electromagnetic wave absorption

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Journal of Materials Science & technology 2024年第28期195卷 63-73页

作者： Kunyao Cao Weiping Ye Yue Zhang Lewei Shen Rui Zhao Weidong Xue Xiaoyu Yang School of Materials and Energy University of Electronic Science and Technology of ChinaChengdu 610054China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing&Shenzhen Research Institute&Joint Laboratory for Marine Advanced Materials Shenzhen 518063China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing and International School of Materials Science&Engineeringand School of Materials Science&EngineeringWuhan University of TechnologyWuhan 430070China School of Engineering and Applied Sciences Harvard UniversityCambridgeMassachusetts 02138United States

The fact that single dielectric loss materials have disadvantages of excessive conductivities and impedance mismatches has given rise to a large effort to develop effective strategies to fabricate electromagnetic wave(EMW)absorbing materials comprised of components that bring about a balance between dielectric loss and magnetic ***,little is known about the essential features that regulate EMW absorption *** study focused on the development of a new EMW absorbing material and gaining information about factors that govern EMW absorption *** materials at the center of the effort are light weight and porous cobalt sulfonated phthalocyanine-reduced graphene oxide(CoSPcrGO)aerogels that were synthesized by using a simple hydrothermal method followed by *** properties of these materials that contribute to the electromagnetic balance between dielectric and magnetic loss were elucidated by first formulating a reasonable hypothesis about how the relative orien-tation of the components in CoSPc-rGO govern p-conjugation and electron transfer from rGO to CoSPc,which is proposed to be a key factor contributing to the regulation of the electromagnetic *** relaxation process of materials was analyzed in detail using a variety of approaches including theoretical calculation,spectroscopic measurements,and experimental and simulation *** fabricated CoSPc-rGO aerogels that contain an ultra-low content of 4%were found to exhibit an extraordinary microwave absorption performance associated with a strong reflection loss of-53.23 dB and a broad effective absorption bandwidth of 8.04 *** results of this study should provide an effective guide for new designs of composite materials for EMW absorption.

关键词： Microwave absorption Polarization relaxation electromagnetic balance Electrons transfer DFT calculation

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Unraveling the impacts of intermolecular interaction on morphology evolution for highly efficient organic solar cells and modules

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Science china Chemistry 2025年第1期68卷 264-272页

作者： Xueqing Ma Yingying Cheng Yuqiang Liu Xinming Zheng Guangliu Ran Hongxiang Li Xinyue Cui Andong Zhang Wenkai Zhang Pei Cheng Wenchao Huang Zhishan Bo Beijing Key Laboratory of Energy Conversion and Storage Materials College of ChemistryBeijing Normal UniversityBeijing 100875China College of Textiles and Clothing State Key Laboratory of Bio-fibers and Eco-textilesQingdao UniversityQingdao 266071China Key State Laboratory of Advanced Technology for Materials Synthesis and Processing School of Materials Science and EngineeringWuhan University of TechnologyWuhan 430070China Department of Physics and Applied Optics Beijing Area Major Laboratory Center for Advanced Quantum StudiesBeijing Normal UniversityBeijing 100875China State Key Laboratory of Polymer Materials Engineering College of Polymer Science and EngineeringSichuan UniversityChengdu 610065China

Understanding the effect of intermolecular interaction on the growth dynamic of active layers is critical for advancing organic solar cells(OSCs).However,the diverse structure of donors and acceptors makes the research *** with customizable structures and properties could simplify this ***,we meticulously tailor two additives of 3,4-ethylenedioxythiophene(EDOT)and 2,5-dibromo-3,4-ethylenedioxythiophene(DBEDOT),possessing distinct intermolecular interaction features to elaborate the inherent *** is found that varied interaction strengths can alter film formation *** enhanced intermolecular interaction between the DBEDOT and non-fullerene acceptor BTP-e C9-4F results in pre-aggregation and longer crystallization duration of BTP-e C9-4F,facilitating the formation of films with compact molecular packing and decent phase ***,exciton dissociation and charge transport become more ***,devices processed with DBEDOT exhibit a remarkable power conversion efficiency of 19.35%in small-area OSCs and 14.11%in bladecoated 5 cm×5 cm organic solar ***,OSCs can maintain 80%of their initial efficiency after continuous annealing at 85℃for over 2,100 h.

关键词： organic solar cell non-fullerene acceptor film growth molecular packing intermolecular interaction

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Electroactive and Self-healing Polyurethane Doped Tin Oxide Interlayers for Efficient Organic Solar Cells

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Chinese Journal of Chemistry 2024年第23期42卷 2979-2986页

作者： Xu Wang Jing Tian Zuhao You Le Lei Aokang Ge Yao Liu State Key Laboratory of Chemical Resource Engineering Advanced Innovation Center for Soft Matter Science and EngineeringBeijing Universityof Chemical TechnologyBeijing 100029China

Tin oxide(SnO_(2))has been widely used as an electron transport layer(ETL)in optoelectronic ***,there are numerous surface or bulk defects in SnO_(2),working as charge recombination centers to degrade ***,an electroactive and self-healing polyurethane(PHNN)was designed by integrating conjugated unit-naphthalene diimide(NDI)into a typical polyurethane *** hydrogen bonds andπinteractions in PHNN work as non-covalent interactions to endow this polymer with superior self-healing *** contains lots of aliphatic amine and carbonyl groups,which effectively passivate the defects in SnO_(2).Theπstacking of NDI units will facilitate electron delocalization,endowing PHNN with electrical activity compared with traditional *** SnO_(2)with PHNN can improve the conductivity and reduce the work function of SnO_(2)layer,which is conducive to efficient charge extraction and *** PHNN doped SnO_(2)as ETL for PM6:Y6 and PM6:BTP-eC9 based inverted organic solar cells can achieve a high efficiency of 17.16%and 17.51%,*** containing doped SnO_(2)ETL show significantly improved efficiency and ***,the electroactive polyurethane doped SnO_(2)interlayers show high performance interfacial modification to align energy-levels in solar cell devices,which have promising applications in organic electronics.

关键词： Organic solar cells Self-healing polyurethane Doped tin oxide Interface engineering Electron transport layer Charge extraction and recombination Charge transport Defect passivation

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High performance of Mg_(3)Bi_(1.5)Sb_(0.5) based materials for power generation:Revealing the counter-intuitive effect of tuning Bi content on the thermoelectric properties

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Journal of Magnesium and Alloys 2024年第11期12卷 4538-4546页

作者： Nuo Qu Yuke Zhu Jianbo Zhu Kuai Yu Fengkai Guo Zihang Liu Qian Zhang Wei Cai Jiehe Sui State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin 150001China School of Materials Science and Engineering Harbin Institute of TechnologyHarbin150001China Department of Materials Science and Engineering Harbin Institute of TechnologyShenzhen 518055China

Recently,Mg_(3)Sb_(2)-xBixalloys have attracted intensive attention,with the aim of maximizing the electrical transport performance via donor element doping,increasing the grain size,as well as electronic band structure ***,less attention has been paid to other significant factors,like how these intrinsic point defects and accompanied secondary phases influence thermoelectric *** this study,the microstructure and thermoelectric transport properties of Mg_(3.2)Sb_(0.5)Bi_(1.495-x)Te_(0.005)(x=0~0.2)compounds were systematically investigated,where tuning the Bi content shows the counter-intuitive impact on the thermoelectric *** was found that the Bipoor environment associated with Bi impurities facilitated the increment of cation vacancy formation energy and then increased the carrier concentration,leading to the enhancement of power ***,the reduction of Bi-rich second phase content weakened the carrier scattering by grain boundaries whereas high carrier mobility was ***,the bipolar thermal conductivity decreased obviously due to the increased majority carrier concentration to suppress the intrinsic *** synergistic optimization pushes the average ZT value(300-573 K)up to 0.95 in the Mg_(3.2)Sb_(0.5)Bi_(1.295)Te_(0.005)***,the calculated single-leg conversion efficiency is increased up to 9.7%with the hot-side temperature of 573 K,as the record-high value in this system.

关键词： Mg_(3)Sb_(2)-xBix alloys Nanoscale Bi-rich phase Bipolar thermal conductivity Thermoelectric performance

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Rapid prediction of flow and concentration fields in solid-liquid suspensions of slurry electrolysis tanks

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International Journal of Minerals,Metallurgy and Materials 2024年第9期31卷 2006-2016页

作者： Tingting Lu Kang Li Hongliang Zhao Wei Wang Zhenhao Zhou Xiaoyi Cai Fengqin Liu State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China State Key Laboratory of Intelligent Optimized Manufacturing in Mining&Metallurgy Process Beijing 102628China School of Materials Science and Engineering Lanzhou University of TechnologyLanzhou 730050China School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China

Slurry electrolysis(SE),as a hydrometallurgical process,has the characteristic of a multitank series connection,which leads to various stirring conditions and a complex solid suspension *** computational fluid dynamics(CFD),which requires high computing resources,and a combination with machine learning was proposed to construct a rapid prediction model for the liquid flow and solid concentration fields in a SE *** scientific selection of calculation samples via orthogonal experiments,a comprehensive dataset covering a wide range of conditions was established while effectively reducing the number of simulations and providing reasonable weights for each ***,a prediction model of the SE tank was constructed using the K-nearest neighbor *** results show that with the increase in levels of orthogonal experiments,the prediction accuracy of the model improved *** model established with four factors and nine levels can accurately predict the flow and concentration fields,and the regression coefficients of average velocity and solid concentration were 0.926 and 0.937,*** with traditional CFD,the response time of field information prediction in this model was reduced from 75 h to 20 s,which solves the problem of serious lag in CFD applied alone to actual production and meets real-time production control requirements.

关键词： slurry electrolysis solid-liquid suspension computational fluid dynamics K-nearest neighbor algorithm rapid prediction

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Critical precipitation behavior of MnTe inclusions in resulfurized steels during solidification

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International Journal of Minerals,Metallurgy and Materials 2024年第8期31卷 1849-1857页

作者： Xiangyu Xu Lu Zhang Zifei Wang Qianren Tian Jianxun Fu Xuemin Wang Center for Advanced Solidification Technology(CAST) School of Materials Science and EngineeringShanghai UniversityShanghai 200444China State Key Laboratory of Advanced Special Steel Shanghai UniversityShanghai 200444China Collaborative Innovation Center of Steel Technology University of Science and Technology BeijingBeijing 100083China Yangjiang Branch Guangdong Laboratory for Materials Science and Technology(Yangjiang)Advanced Alloys LaboratoryYangjiang 529500China

Te treatment is an effective method for modifying sulfide inclusions,and MnTe precipitation has an important effect on thermal brittleness and steel corrosion *** most actual industrial applications of Te treatment,MnTe precipitation is *** critical precipitation behavior of MnTe inclusions was investigated through scanning electron microscopy,transmission electron microscopy,machine learning,and first-principles *** preferentially precipitated at the container mouth for sphere-like sulfides and at the interface between MnS grain boundaries and steel matrix for rod-like *** MnS/MnTe interface was semicoherent.A composition transition zone with a rock-salt structure exhibiting periodic changes existed to maintain the semicoherent *** critical precipitation behavior of MnTe inclusions in resulfurized steels involved three stages at varying ***,Mn(S,Te)precipitated during ***,MnTe with a rock-salt structure precipitated from Mn(S,Te).Third,MnTe with a hexagonal NiAs structure transformed from the rock-salt *** solubility of Te in MnS decreased with decreasing *** critical precipitation behavior of MnTe inclusions in resulfurized steels was related to the MnS precipitation *** the increase in MnS precipitation temperature,the critical Te/S weight ratio *** consideration of the cost-effectiveness of Te addition for industrial production,the Te content in resulfurized steels should be controlled in accordance with MnS precipitation temperature and S content.

关键词： resulfurized steels modification of inclusion manganese telluride precipitation

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Molecular surface functionalization of In_(2)O_(3) to tune interfacial microenvironment for enhanced catalytic performance of CO_(2) electroreduction

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Nano Research 2024年第3期17卷 1242-1250页

作者： Suwen WangQiang GaoCui Xu Shuai Jiang Mengyang Zhang Xianjun Yin Hui-Qing Peng Bin Liu Yu-Fei Song State Key Laboratory of Chemical Resource Engineering Beijing Advanced Innovation Center for Soft Matter Science and EngineeringCollege of ChemistryBeijing University of Chemical TechnologyBeijing 100029China

Indium-based materials(e.g.,In_(2)O_(3))are a class of promising non-noble metal-based catalysts for electroreduction of carbon dioxide(CO_(2)).However,competitive hydrogen reduction reaction(HER)on indium-based catalysts hampers CO_(2) reduction reaction(CO_(2)RR)*** herein tune the interfacial microenvironment of In_(2)O_(3) through chemical graft of alkyl phosphoric acid molecules using a facile solution-processed strategy for the first time,which is distinguished from other researches that tailor intrinsic activity of In_(2)O_(3) *** surface functionalization of alkyl phosphoric acids over In_(2)O_(3) is demonstrated to remarkably boost CO_(2) *** example,octadecylphosphonic acid modified In_(2)O_(3) exhibits Faraday efficiency for H_(2) H_(2) H_(2)(FE)of as low as 6.6%and FEHCOOH of 86.5%at-0.67 V ***,which are far superior to parent In_(2)O_(3) counterparts(FE of 24.0%and FEHCOOH of 63.1%).Moreover,the enhancing effect of alkyl phosphoric acid functionalization is found to be closely related to the length of alkyl *** virtue of comprehensive experimental characterizations and molecular dynamics simulations,it is revealed that the modification of alkyl phosphoric acids significantly alters the interface microenvironment of the electrocatalyst,which changes the electrocatalyst surface from hydrophilic and aerophobic to hydrophobic and *** this case,the water molecules are pushed away and more CO_(2) molecules are trapped,increasing local CO_(2) concentration at In_(2)O_(3) active sites,thus leading to the significantly enhanced CO_(2)RR and suppressed *** work highlights the importance of regulating the interfacial microenvironment of inorganic catalysts by molecular surface functionalization as a means for promoting the electrochemical performance in electrosynthesis and beyond.

关键词： carbon dioxide(CO_(2))electroreduction interfacial microenvironment molecular surface functionalization In_(2)O_(3)catalyst water and CO_(2)diffusion

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