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Wet-milling synthesis of immobilized Pt/Ir nanoclusters as promising heterogeneous catalysts

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Nano Research 2022年第4期15卷 3065-3072页

作者： Peng Du Kai Huang Xiaoyuan Fan Jingteng Ma Naveed Hussain Ruyue Wang Bohan Deng Binghui Ge Haolin Tang Ru Zhang Ming Lei Hui Wu State Key Laboratory of Information Photonics and Optical Communications&School of Science Beijing University of Posts and TelecommunicationsBeijing 100876China State Key Laboratory of New ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of ChinaChengdu 610054China Institutes of Physical Science and Information Technology Anhui UniversityHefei 230601China State Key Laboratory of Advanced Technology for materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China

Being a typical state of the art heterogeneous catalyst,supported noble metal catalyst often demonstrates enhanced catalytic ***,a facile synthetic method for realizing large-scale and low-cost supported noble metal catalyst is strictly *** this end,by making use of the strong metal-support interaction(SMSI)and mechanochemical reaction,we introduce an efficient synthetic route to obtain ultrafine Pt and Ir nanoclusters immobilized on diverse substrates by wet chemical *** further demonstrate the scaling-up effect of our approach by large-scale ball-milling production of Pt nanoclusters immobilized on TiO_(2)*** synthesized Pt/Ir@Co_(3)O_(4)catalysts exhibit superior oxygen evolution reaction(OER)performance with only 230 and 290 mV overpotential to achieve current density of 10 and 100 mA·cm^(-2),beating the catalytic performance of Co_(3)O_(4)supported Pt or Ir clusters and commercial Ir/*** is envisioned that the present work strategically directs facile ways for fabricating supported noble metal heterogeneous catalysts.

关键词： heterogeneous catalysts metal clusters wet milling large-scale production strong metal–support interaction

Discrete element modeling and verification of the simulation parameters for chopped hybrid Broussonetia papyrifera stems

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International Journal of Agricultural and Biological engineering 2024年第1期17卷 23-32页

作者： Caiwang Peng Junwei Chen Xi He Songlin Sun Yulong Yin Zhong Chen College of Mechanical and Electrical engineering Hunan Agricultural UniversityChangsha 410128China College of Animal Science and Technology Hunan Agricultural UniversityChangsha 410128China Rongcheng Gouyang Modern Agriculture(Chongqing)Co. LtdChongqing 500153China

In this study,the discrete element software EDEM was applied to establish a simulation model of non-uniform-sized particle units for Broussonetia papyrifera stalks,which aimed to address the low utilization rate of existing Broussonetia papyrifera harvesting machinery,the significant variation between the simulated model of Broussonetia papyrifera stalks and their actual appearance,as well as the absence of contact parameter *** a combination of the free-fall collision method,inclined plane sliding method,and inclined plane rolling method,numerical simulation was conducted to analyze the pattern of variations in contact parameters between Broussonetia papyrifera stalks and the steel material of the ***,these parameters were *** results showed that the coefficient of restitution between Broussonetia papyrifera stalks and steel materials was 0.321,the static friction factor was 0.589,and the rolling friction factor was *** the parameters of contact between Broussonetia papyrifera stalks as variables and the experimentally measured pile angle as the objective of optimization,the steepest ascent experiment and the three-factor five-level rotation combination experiment were *** this way,a second-order response model was constructed to analyze the relationship between the contact parameters and the pile *** the optimization analysis of experimental data,it was determined that the coefficient of restitution between Broussonetia papyrifera stalks was 0.21,the static friction factor was 0.24,and the rolling friction factor was ***,the calibration results were validated through experimentation to show that the relative error between the obtained pile angle under the context of optimal parameter combination and the actual one was 4.11%.In addition,the relative error of mass flow rate in spiral transport was within a reasonable range,this study lays a foundation both theoretically and statistic

关键词： hybrid Broussonetia papyrifera stem discrete element method repose angle contact parameters calibration

One-step electrochemical reduction of stibnite concentrate in molten borax

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International Journal of Minerals,Metallurgy and materials 2019年第10期26卷 1258-1265页

作者： Levent Kartal Mehmet Baris Daryal Güldem Kartal Sireli Servet Timur department of Metallurgical and materials engineering Hitit UniversityCorum 19030Turkey department of Metallurgical and materials engineering Istanbul Technical UniversityIstanbul 34469Turkey

In this study,antimony production from a stibnite concentrate(Sb2S3)was performed in one step using a molten salt electrolysis method and borax as an *** reduction of the stibnite concentrate was performed at 800℃under galvanostatic conditions and explained in detail by the reactions and intermediate compounds formed in the *** effects of current density(100 800 mA cm^-2)and electrolysis time(10 40 min)on cathodic current efficiency and antimony yields were systematically *** the highest current efficiency,which was obtained at 600 mA cm^-2,direct metal production was possible with 62%cathodic current efficiency and approximately 6 kWh/kg energy *** the end of the 40-min electrolysis duration at 600 mA cm^-2 current density,antimony reduction reached 30.7 g and 99%of the antimony fed to the cell was obtained as metal.

关键词： molten salt electrolysis electrochemical reduction antimony antimony extraction stibnite borax

Dual strategy of modulating growth temperature and inserting ultrathin barrier to enhance the wave function overlap in type-Ⅱ superlattices

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Nano Research 2022年第6期15卷 5626-5632页

作者： Yuyang Wu Yahui Zhang Yi Zhang Yunhao Zhao Yu Zhang Yingqiang Xu Chongyun Liang Zhichuan Niu Yi Shi Renchao Che Laboratory of Advanced materials Shanghai Key Lab of Molecular Catalysis and Innovative MaterialsDepartment of Materials ScienceFudan UniversityShanghai 200438China State Key Laboratory for Superlattices and Microstructures Institute of SemiconductorsChinese Academy of SciencesBeijing 100083China National Laboratory of Solid-State Microstructures School of Electronic Science and Engineering and CollaborativeInnovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210093China Joint-Research Center for Computational materials Zhejiang LaboratoryHangzhou 311100China

Maximizing wave function overlap(WFO)within type-II superlattices(T2SL)is demonstrated to be important for improving their photoelectric properties,such as optical transition strength and quantum efficiency,which,however,remains a great challenge for ***,the dual strategy of modulating growth temperature and inserting ultrathin AlAs barrier into the AlSb layers is presented to enhance the WFO in InAs/AlSb *** charge distributions and strain states indicate that moderate growth temperature of 470°C promotes the As-Sb exchange at AlSb-on-InAs(AOI)interfaces,which would introduce skew of energy band structure towards InAs-on-AlSb(IOA)*** band structure could drive electrons and holes to the IOA interfaces simultaneously,thus resulting in the enhanced *** this basis,insertion of relatively thick(0.3 nm)AlAs layers is found to squeeze more holes towards adjacent interfaces,boosting the WFO *** InAs/AlSb superlattices with optimized WFO reveal better optical performance,where the peak intensity shows 50%improvement in the PL spectra than the original ***,a dual-miniband radiative transition mechanism appears in the InAs/AlSb superlattice with relatively thick AlAs intercalation,which helps broaden the wavelength range of the superlattice.

关键词： wave function overlap type-II superlattices photoelectric properties charge distribution energy band alignment

Polymerization-Amplified Photoacoustic Signal by Enhancing Near-Infrared Light-Harvesting Capacity and Thermal-to-Acoustic Conversion

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Chinese Journal of Polymer Science 2022年第9期40卷 1090-1100页

作者： He-Qi Gao Jing-Tian Zhang Xin-Wen Qi Di Jiao Yu-Ning Hong Ke Shan Xiang-Long Kong Dan Ding Key Laboratory of Bioactive materials Ministry of Educationand College of Life SciencesNankai UniversityTianjin 300071China Center for AIE Research Shenzhen Key Laboratory of Polymer Science and TechnologyGuangdong Research Center for Interfacial Engineering of Functional MaterialsCollege of Materials Science and EngineeringCollege of Physics and Optoelectronic EngineeringShenzhen UniversityShenzhen 518060China department of Chemistry and Physics La Trobe Institute for Molecular ScienceLa Trobe UniversityMelbourneVictoria3086Australia Shandong Artificial intelligence Institute and Shandong Computer Science Center Qilu University of TechnologyJinan 250353China

As a frontier imaging technique for biomedical applications,photoacoustic(PA)imaging has been developed *** development of new design strategies and excellent PA imaging reagents to boost PA conversion is eagerly desirable for high quality PA imaging but complicated to ***,we develop a new strategy in which PA imaging reagents with better properties can be easily optimized by polymerization.A series of new PA imaging reagents were designed and *** polymerization strategy can effectively promote the PA signal by specifically increasing the thermal-to-acoustic conversion *** these materials shared the same building units,the optimized effectiveness of polymerization strategy in terms of near-infrared light-harvesting capacity and thermal-to-acoustic conversion efficiency are discussed,*** polymers with intense intramolecular motion exhibit an amplified PA signal by elevating thermal-to-acoustic conversion and its higher light-harvesting capability at redshifted *** simultaneously strong PA signal and photothermal conversion efficiency of p-TTmB NPs enable precise PA imaging and effective photothermal *** work highlights a simple and available design guideline of polymerization for amplifying the PA effect and optimizing existing materials.

关键词： Intramolecular motion Thermal-to-acoustic conversion Photoacoustic imaging Photothermal conversion efficiency Polymerization

Effects of High Magnetic Field on Solidification and Corrosion Behaviors of Magnesium Alloy

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Journal of materials Science & Technology 2007年第6期23卷 806-810页

作者： Canfeng FANG Xingguo ZHANG Hai HAO Shouhua JI Junze JIN department of materials Processing engineering School of Materials Science and Engineering Dalian University of Technology Dalian 116024 China

The solidification behaviors of AZ61 magnesium alloy under a high magnetic field were studied. The corrosion property of AZ61 alloy was investigated in a solution of 3.5 mol/L NaCI by measuring electrochemical ***. The results show that the high magnetic field can refine microstructure and benefit aluminum transfer. The crystal of α-Mg is induced to orient with their c-axis parallel to the magnetic field. The corrosion studies indicate that different crystal plane of magnesium has different corrosion property. The passivating films on the α- and b-planes have higher corrosion resistance than that on the c-plane. Aligned structure affects the corrosion property of AZ61 magnesium alloy.

关键词： Magnesium alloy High magnetic field Microstructure Corrosion

Near-seamless joining of Cf/SiC composites using Y_(3)Si_(2)C_(2)via electric field-assisted sintering technique

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Journal of Advanced ceramics 2022年第8期11卷 1196-1207页

作者： Teng YU Jie XU Xiaobing ZHOU Peter TATARKO Yang LI Zhengren HUANG Qing HUANG engineering Laboratory of Advanced Energy materials Ningbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo 315201China Institute of Inorganic Chemistry Slovak Academy of SciencesDúbravskácesta 984536 BratislavaSlovakia Centre of Excellence for Advanced materials Application Slovak Academy of SciencesDúbravskácesta 984511 BratislavaSlovakia National Key Laboratory of Science and Technology on High-Strength Structural materials Central South UniversityChangsha 410083China

A novel Y_(3)Si_(2)C_(2)material was synthesized at a relatively low temperature(900℃)using a molten salt method for the first time,and subsequently used as the joining material for carbon fiber reinforced SiC(Cf/SiC)*** sound near-seamless joints with no obvious remaining interlayer were obtained at 1600℃using an electric field-assisted sintering technique(FAST).During joining,a liquid phase was formed by the eutectic reaction among Y_(3)Si_(2)C_(2),γ(Y–C)phase,and SiC,followed by the precipitation of SiC *** presence of the liquid promoted the sintering of newly formed SiC particles,leading to their complete consolidation with the Cf/SiC *** the other hand,the excess of the liquid was pushed away from the joining area under the effect of a uniaxial pressure of 30 MPa,leading to the formation of the near-seamless *** highest shear strength(Ä)of 17.2±2.9 MPa was obtained after being joined at 1600℃for 10 *** failure of the joints occurred in the Cf/SiC matrix,indicating that the interface was stronger than that of the Cf/SiC *** formation of a near-seamless joint minimizes the mismatch of thermal expansion coefficients and also irradiation-induced swelling,suggesting that the proposed joining strategy can be potentially applied to SiC-based ceramic matrix composites(CMCs)for extreme environmental applications.

关键词： Cf/SiC joining Y_(3)Si_(2)C_(2) electric field-assisted sintering technique(FAST)

Effect of surface nanocrystallization and PPEC time on complex nanocrystalline hard layer fabricated by plasma electrolysis

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Transactions of Nonferrous Metals Society of China 2010年第3期20卷 425-431页

作者： M.ALIOFKHAZRAEI SH.AHANGAR ANI A.SABOUR ROUHAGHDAM department of materials engineering Faculty of EngineeringTarbiat Modares University department of Advanced materials and Renewable Energies Iranian Research Organization for Science and Technology(IROST)

Size distribution of nano-carbides produced by duplex treatments of surface nanocrystallization(by surface severe plastic deformation) and plasma electrolytic carburizing on CP-Ti was *** and kurtosis of Gussian shape distribution curves were studied and the effect of time was *** usage of longer time is more suitable for achieving less size of complex *** roughness of treated samples was *** is observed that there is an optimum level for time on surface roughness increasing(difference between two measured data).

关键词：表面纳米化电解制备时间等离子体表面粗糙度分布曲线塑性变形尺寸分布

Anisotropic, biomorphic cellular Si_(3)N_(4) ceramics with directional well-aligned nanowhisker arrays based on wood-mimetic architectures

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Journal of Advanced ceramics 2022年第4期11卷 656-664页

作者： Songsong XU Xiaonan ZHOU Qiang ZHI Junjie GAO Liucheng HAO Zhongqi SHI Bo WANG Jianfeng YANG Kozo ISHIZAKI State Key Laboratory for Mechanical Behavior of materials Xi’an Jiaotong UniversityXi’an 710049China High Voltage Switchgear Insulation materials Laboratory of State Grid Pinggao Group Co.Ltd.Pingdingshan 467001China department of Mechanical engineering Nagaoka University of TechnologyNagaoka 940-2188Japan

Inspired by the transport behavior of water and ions through the aligned channels in trees,we demonstrate a facile,scalable approach for constructing biomorphic cellular Si_(3)N_(4) ceramic frameworks with well-aligned nanowhisker arrays on the surface of directionally aligned microchannel *** a facile Y(NO_(3))_(3) solution infiltration into wood-derived carbon preforms and subsequent heat treatment,we can faultlessly duplicate the anisotropic wood architectures into free-standing bulk porous Si_(3)N_(4) ***,α-Si3N4 microchannels were synthesized on the surface of CB-templates via carbothermal reduction nitridation(CRN).And then,homogeneous distributed Y–Si–O–N liquid phase on the walls of microchannel facilitated the anisotropicβ-Si3N4 grain growth to form nanowhisker *** dense aligned microchannels with low-tortuosity enable excellent load carrying capacity and thermal conduction through the entire *** a result,the porous Si_(3)N_(4) ceramics exhibited an outstanding thermal conductivity(TC,k_(R)≈6.26 W·m^(−1)·K^(−1)),a superior flexural strength(σ_(L)≈29.4 MPa),and a relative high anisotropic ratio of TC(k_(R)/k_(L)=4.1).The orientation dependence of the microstructure–property relations may offer a promising perspective for the fabrication of multifunctional ceramics.

关键词： silicon nitride anisotropic carbothermal reduction nitridation(CRN) wood nanowhisker arrays