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strongly Coupled Ag/sn-snO_(2)Nanosheets Toward CO_(2)Electroreduction to Pure HCOOH solutions.a. Ampere‑Level Current

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Nano-Micro Letters 2024年第3期16卷 212-226页

作者： Min Zhang Aihui Cao Yucui Xiang Chaogang Ban Guang Han Junjie Ding Li‑Yong Gan Xiaoyuan Zhou College of Physics.a.d Center of Quantum Materials.a.d Devices Chongqing UniversityChongqing 401331People’s Republic of China s.a.e Key Laboratory of structural Chemistry Fujian Institute of Research on the Structure of MatterChinese Academy of Sciences(CAS)Fuzhou 350002People’s Republic of China College of Materials science and Engineering Chongqing UniversityChongqing 400044People’s Republic of China Institute of New Energy storage Materials.a.d Equipment Chongqing 401135People’s Republic of China s.a.e Key Laboratory of Coal Mine Disaster Dynamics.a.d Control Chongqing UniversityChongqing 400044People’s Republic of China

Electrocatalytic reduction of CO_(2) converts intermittent renewable electricity into value-added liquid products with an enticing prospect,but its practical application is hampered due to the lack of high-performance ***,we elaborately design and develop strongly coupled nanosheets composed of Ag nanoparticles.a.d sn-snO_(2) grains,designated as.a./sn-snO_(2) nanosheets(Nss),which possess optimized electronic structure,high electrical conductivity,and more accessible *** a result,such a catalyst exhibits unprecedented catalytic performance toward CO_(2)-to-formate conversion with near-unity faradaic efficiency(≥90%),ultrahigh partial current density(2,000 mA cm^(−2)),and superior long-term s.a.ility(200 mA cm^(−2),200 h),surpassing the reported catalysts of CO_(2) electroreduction to ***,in situ attenuated total reflection-infrared spectra combined with theoretical calculations revealed that electron-enriched sn sites on Ag/sn-snO_(2)Nss not only promote the formation of*OCHO and alleviate the energy barriers of*OCHO to*HCOOH,but also impede the desorption of H*.Notably,the Ag/sn-snO_(2)Nss.a. the cathode in a membrane electrode assembly with porous solid electrolyte layer reactor can continuously produce~0.12 M pure HCOOH solution at 100 mA cm^(−2)over 200 *** work may inspire further development of advanced electrocatalysts.a.d innovative device systems for promoting practical application of producing liquid fuels from CO_(2).

关键词： Electrochemical CO_(2)reduction Coupled Ag/sn-snO_(2)nanosheets electronic structure Porous solid electrolyte Pure

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In-situ powder mixing for laser-based directed energy deposition of functionally graded materials

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Advances in Manufacturing 2024年第1期12卷 150-166页

作者： Ji-Peng Chen shou-Chun Xie He Huang school of Mechanical and electronic Engineering Nanjing Forestry UniversityNanjing210037People’s Republic of China Nanjing Huirui Photoelectric Technology Co. LtdNanjing211121People’s Republic of China

The mixing of powders is.a.highly relevant field under additive manufacturing,however,it has.a.tracted limited interest to *** in-situ mixing of various powders remains.a.significant *** paper proposes.a.new method utilizing a s.a.ic mixer for the in-situ mixing of multiple powders through the laser-based directed energy deposition(DED)of functionally graded ***,a powder-mixing experimental platform was es.a.lished;WC and 316L powders were selected for the mixing ***,s.a.ning electron microscopy,energy dispersive spectroscopy,and image processing were used to vis.a.ly evaluate the homogeneity and proportion of the in-situ mixed ***,powder-mixing simulations were conducted to determine the powder-mixing *** the simulations.a.powder carrier gas flow field and particle mixing were ***,a WC/316L metal matrix composite sample was produced using laser-based DED to verify the application potential of the s.a.ic *** was found that the s.a.ic mixer could adjust the powder ratio online,and a response time of 1–2 s should be considered when adjusting the ratio of the mixed powder.A feasible approach for in-situ powder mixing for laser-based DED was demonstrated and investigated,creating the basis for functionally graded materials.

关键词： Laser Deposition s.a.ic mixer Powder mixing Functionally graded materials

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A study of pulsed high voltage driven hollow-cathode electron beam sources through synchronous optical trigger

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Plas.a.science and Technology 2024年第5期26卷 82-90页

作者：霍卫杰贺伟国韩罗峰朱康武王锋 s.a.ghai Aeros.a.e electronic Technology Institute Shanghai 201109People’s Republic of China school of Mechatronic Engineering and Automation Shanghai UniversityShanghai 200444People’s Republic of China school of Fundamental Physics.a.d Mathematical sciences Hangzhou Institute for Advanced StudyUniversity of Chinese Academy of SciencesHangzhou 310024People’s Republic of China Key Laboratory of Gravitational Wave Precision Measurement of Zhejiang Province Taiji Laboratory for Gravitational Wave UniverseHangzhou 310024People’s Republic of China s.a.ghai Aeros.a.e Control Technology Institute Shanghai 201109People’s Republic of China

In this study,a pulsed,high voltage driven hollow-cathode electron beam sources through an optical trigger is designed with characteristics of simple structure,low cost,and easy *** validate the new design,the characteristics of hollow-cathode discharge and electron beam characterization under pulsed high voltage drive are studied experimentally and discussed by discharge characteristics.a.d analyses of waveform details,*** validation experiments indicate that the pulsed high voltage supply significantly improves the frequency and s.a.ility of the discharge,which provides.a.new solution for the realization of a high-frequency,high-energy electron beam *** peak current amplitude in the high-energy electron beam increases from 6.2 A to 79.6 A,which indicates the pulsed power mode significantly improves the electron beam ***,increasing the capacitance significantly affects the highcurrent,lower-energy electron beam more than the high-energy electron beam.

关键词： hollow-cathode nanosecond pulsed electron beam sources optical trigger pulsed high voltage supply beam current distribution

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Effect of ion stress on properties of magnetized plas.a.sheath

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Plas.a.science and Technology 2024年第2期26卷 1-12页

作者：陈龙崔作君高维富段萍阚子晨檀聪琦陈俊宇 school of science Dalian Maritime UniversityDalian 116026People's Republic of China

In the plas.a.sheath, there is.a.significant gradient in ion velocity, resulting in strong stress on ions treated as.a.fluid. This.a.pect has often been neglected in previous sheath studies. This study is based on the Braginskii plas.a.transport theory and es.a.lishes.a.1D3V sheath fluid model that takes into account the ion stress effect. Under the assumption that ions undergo both electric and diamagnetic drift in the presheath region, self-consistent boundary conditions,including the ion Bohm velocity, are derived based on the property of the sagdeev ***, assuming that the electron velocity at the wall follows.a.truncated Maxwell distribution, the wall floating potential is calculated, leading to a more accurate sheath thickness estimation. The results show that ion stress significantly reduces the sheath thickness, enhances ion Bohm velocity, wall floating potential, and ion flux at the wall. It hinders the acceleration of ions within the sheath, leading to notable alterations in the particle density profiles within the sheath. Further res.a.ch indicates that in ion stress, bulk viscous stress has the greatest impact on sheath properties.

关键词： magnetized plas.a.sheath ion stress Bohm criterion

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All‑Covalent Organic Framework Nanofilms.a.sembled Lithium‑Ion Capacitor to solve the Imbalanced Charge storage Kinetics

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Nano-Micro Letters 2024年第6期16卷 246-260页

作者： Xiaoyang Xu Jia Zhang Zihao Zhang Guandan Lu Wei Cao Ning Wang Yunmeng Xia Qingliang Feng s.a.lin Qiao College of Chemistry and Pharmaceutical Engineering Hebei University of Science and TechnologyShijiazhuang 050018People’s Republic of China school of Chemistry and Chemical Engineering Northwestern Polytechnical UniversityXi’an 710072People’s Republic of China Hebei Engineering Res.a.ch Center of Organic solid Photoelectric Materials for electronic Information Shijiazhuang 050018People’s Republic of China

Free-s.a.ding covalent organic framework(COFs)nanofilms exhibit a remarkable ability to rapidly intercalate/de-intercalate Li^(+) in lithium-ion batteries,while simultaneously exposing affluent active sites in *** development of these nanofilms offers.a.promising solution to address the persistent challenge of imbalanced charge storage kinetics between battery-type anode and capacitor-type cathode in lithium-ion capacitors(LICs).Herein,for the first time,custom-made COFBTMB-TP and COFTAPB-BPY nanofilms.a.e synthesized as the anode and cathode,respectively,for an all-COF nanofilm-structured *** COFBTMB-TP nanofilm with strong electronegative–CF3 groups enables tuning the partial electron cloud density for Li^(+) migration to ensure the rapid anode kinetic *** thickness-regulated cathodic COFTAPB-BPY nanofilm can fit the anodic COF nanofilm in the *** to the aligned 1D channel,2D aromatic skeleton and accessible active sites of COF nanofilms,the whole COFTAPB-BPY//COFBTMB-TP LIC demonstrates.a.high energy density of 318 mWh cm^(−3) at a high-power density of 6 W cm^(−3),excellent rate capability,good cycle s.a.ility with the capacity retention rate of 77%after *** COFTAPB-BPY//COFBTMB-TP LIC represents.a.new benchmark for currently reported film-type LICs.a.d even film-type *** being comprehensively explored via ex situ XPs,7Li solid-s.a.e NMR analyses.a.d DFT calculation,it is found that the COFBTMB-TP nanofilm facilitates the reversible conversion of semi-ionic to ionic C–F bonds during lithium ***-TP exhibits.a.strong interaction with Li^(+) due to the C–F,C=O,and C–N bonds,facilitating Li^(+) desolation and absorption from the *** work addresses the challenge of imbalanced charge storage kinetics.a.d capacity between the anode and cathode and also pave the way for future miniaturized and wearable LIC devices.

关键词： Covalent organic frameworks Lithium-ion capacitor Charge storage kinetic

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Laboratory observation of electron energy distribution near three-dimensional magnetic nulls

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Plas.a.science and Technology 2024年第3期26卷 46-52页

作者：何任川徐田超杨肖易肖池阶张祖煜袁瑞鑫王晓钢郭志彬余修铭盖跃 s.a.e Key Laboratory of Nuclear Physics.a.d Technology School of PhysicsPeking UniversityBeijing 100871People's Republic of China Department of Physics Harbin Institute of TechnologyHarbin 150001People's Republic of China

The acceleration of electrons near three-dimensional(3D)magnetic nulls is crucial to the energy conversion mechanism in the 3D magnetic reconnection *** explore electron acceleration in a 3D magnetic null topology,we constructed a pair of 3D magnetic nulls in the PKU Plas.a.Test(PPT)device and observed acceleration of electrons near magnetic *** study measured the plas.a.floating potential and ion density profiles.a.ound the 3D magnetic *** potential wells near nulls may be related to the energy variations of electrons,so we measured the electron distribution functions(EDFs.a. different s.a.ial *** axial variation of EDF shows that the electrons deviate from the Maxwell distribution near magnetic *** s.a.ning probes that can directionally measure and theoretically analyze based on curve fitting,the variations of EDFs.a.e linked to the changes of plas.a.potential under 3D magnetic null *** kinetic energy of electrons.a.celerated by the electric field is 6 eV(v_(e)~7v_(Alfvén-e))and the s.a.e of the region where accelerating electrons exist is in the order of serval electron skin depths.

关键词： electron acceleration EEDF 3D magnetic null magnetic reconnection

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Unique Ultrastructural Alterations in the Placenta Associated With Macrosomia Induced by Ges.a.ional Diabetes Mellitus

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Maternal-Fetal Medicine 2024年第3期6卷 164-172页

作者： Junxiang Wei Tianyu Dong Mingxia Chen Xiao Luo Yang Mi Department of Obstetrics Northwest Women’s and Children’s HospitalXi’an 710061China Laboratory of electron Microscope Health Science Center of Xi’an Jiaotong UniversityXi’an 710049China Department of Physiology and Pathophysiology School of Basic Medical SciencesHealth Science Center of Xi’an Jiaotong UniversityXi’an 710049China

Objective:To investigate the morphological and ultrastructural alterations in placentas from pregnancies with ges.a.ional diabetes mellitus(GDM)–induced macrosomia,term nondiabetic macrosomia,and normal ***:sixty full-term placentaswere collected,and clinical data alongwith informed consent were obtained from pregnant womenwho underwent regular visit checks.a.d delivered their newborns in Northwest Women’s.a.d Children’s Hospital between May and December *** were divided into three equal groups:normal pregnancy(control group),nondiabetic macrosomia group,and macrosomia complicated with GDM(diabetic macrosomia)*** morphological data of placentas were recorded,and placental samples were processed for examination of ultrastructural and stereological changes using transmission electron *** of variance and chi-squared test were used to examine the differences.a.ong the three groups for continuous.a.d categorical variables,***:The baseline characteristics of mothers.a.d neonates did not differ across the three groups,except for a significantly higher birth weight in the diabetic macrosomia group(4172.00±151.20 g vs.3192.00±328.70 g,Psomia group(4138.00±115.20 g vs.3192.00±328.70 g,Ps revealed that placental weight was.a.so highest in the diabeticmacrosomia group comparedwith control group(810.00±15.81 g vs.490.00±51.48 g,Psomia group(810.00±15.81 g vs.684.00±62.69 g,Ps significantly lower in the diabetic macrosomia group compared with that in the control group(5.15±0.19 vs.6.54±0.63,Psomia group(5.15±0.19 vs.6.09±0.52,Pst,the BW/PW ratio in nondiabetic macrosomia did not differ significantly from that in the control *** ultrastructural changes in terminal v

关键词： Placenta Macrosomia Ges.a.ional diabetes mellitus Ultrastructure Morphology

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summary of the 11th Conference on Magnetic Confined Fusion Theory and simulation

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Plas.a.science and Technology 2024年第10期26卷 1-7页

作者： Guangzhou HAO Jianqiang XU Youwen sUN Zhibin GUO Organizing Committee of the 11th Conference on Magnetic Confined Fusion Theory and simulation southwestern Institute of Physics Chengdu 610041People’s Republic of China Institute of Plas.a.Physics Hefei Institutes of Physical ScienceChinese Academy of SciencesHefei 230031People’s Republic of China s.a.e Key Laboratory of Nuclear Physics.a.d Technology Fusion Simulation CenterSchool of PhysicsPeking UniversityBeijing 100871People’s Republic of China 不详

This conference report summarizes recent progress in plas.a.theory and simulation that was presented in contributed papers.a.d discussions.a. the 11th Conference on Magnetic Confined Fusion Theory and simulation(CMCFTs)held in Chengdu,China,27–30 October,*** in various fields has been *** example,results on zonal flow generation by mode coupling,simulations of the key physics of divertor detachment,energetic particle effects on magnetohydrodynamic(MHD)modes in addition to ion-and electron-s.a.e turbulence,physics of edge coherent modes.a.d edge-localized modes.a.d the optimization of ion heating schemes.a. well as confinement scenarios using advanced integrated modeling are presented at the *** this conference,the scientific res.a.ch groups were organized into six categories:(a)edge and divertor physics;(b)impurity,heating,and current drive;(c)energetic particle physics;(d)turbulent transport;(e)MHD ins.a.ility;and(f)integrated modeling and code development.A summary of the highlighted progress in these working groups is presented.

关键词： magnetic confined fusion(MCF) theory and simulation modeling tokamak

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Polarimeter–interferometer diagnostic using terahertz solid-s.a.e sources for fluctuation measurements on Keda Torus e Xperiment(KTX)

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Plas.a.science and Technology 2024年第3期26卷 61-65页

作者：汪兴康毛文哲谢锦林兰涛李弘刘阿娣周楚温晓辉卫子安吴捷陈晨刘东宽饶贤昊蔡虎邬佳仁邓鹏刘海庆丁卫星庄革刘万东 school of Nuclear science and Technology University of Science and Technology of ChinaHefei 230026People's Republic of China Institute of Plas.a.Physics Chinese Academy of SciencesHefei 230031People's Republic of China

A multi-channel polarimeter-interferometer has been developed on the Keda Torus eXperiment(KTX)for the study of equilibrium dynamics.a.d internal magnetic fluctuations.a.three-wave technique based on terahertz solid-s.a.e sources(-650 GHz)is.a.plied for simultaneous measurements of electron density and Faraday rotation *** output power of the microwave source is 2 *** rotation effect using a rotating wave plate is tested with phase noise less than 0.8°,and the density phase noise is less than 0.9°.Measurement of Faraday rotation angle and density for discharges on KTX have demonstrated high sensitivity to internal MHD activities.

关键词： plas.a.diagnostics interferometry terahertz polarimeter

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Engineering and unders.a.ding sns_(0.5)se_(0.5)@N/s/se triple-doped carbon nanofibers for enhanced sodium-ion batteries

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Chinese Chemical Letters 2024年第4期35卷 226-230页

作者： Fanjun Kong Yixin Ge shi Tao Zhengqiu Yuan Chen Lu Zhida Han Lianghao Yu Bin Qian school of electronic and Information Engineering Changshu Institute of TechnologyChangshu 215500China Key Laboratory of spin electron and Nanomaterials of Anhui Higher Education Institutes Suzhou UniversitySuzhou 234000China Far East Holding Group Co. Ltd.Yixing 214200China

Tin-based chalcogenides have attracted tremendous.a.tention as.a. anode material for sodium storage owing to their unique structure and high theoretical capacity. Unfortunately, the large volume change and poor conductivity lead to sluggish reaction kinetics.a.d poor cycling performance. Herein, sns_(0.5)se_(0.5)nanoparticles coupled with N/s/se triple-doped carbon nanofibers(sns_(0.5)se_(0.5)@Nsse-C) are designed and synthesized through electrospinning and annealing process. Benefiting from the synergistic effects of sns_(0.5)se_(0.5)and Nsse-C, the sns_(0.5)se_(0.5)@Nsse-C nanofibers exhibit a high reversible capacity and ultralong cycle life at higher current density for sodium-ion batteries. Furthermore, the sodium storage mechanism and electrochemical reaction kinetics of the sns_(0.5)se_(0.5)@Nsse-C composite are characterized by the in-situ measurements. The theoretical calculations further reveal the structural advantages of sns_(0.5)se_(0.5)@NsseC composite, which exhibits.a.high adsorption energy of Na+. This work can provide a novel idea for the synthesis of ternary tin-based chalcogenides.a.d is beneficial for the investigation of their reaction kinetics.

关键词： sns_(0.5)se_(0.5) Carbon nanofibers Doping Density functional theory sodium ion batteries

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