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Promoting effect of d-band center and in-situ precipitation strategy on sulfur evolution reaction

Journal of Energy Chemistry 2025年第5期104卷 740-748页

作者： Jun Pu Yun Tan Jiasen Yin Zihan Shen Shoujie Liu Kai Zhang Lei Zhou Yagang Yao Key Laboratory of Functional Molecular Solids Ministry of EducationAnhui Provincial Engineering Laboratory for New-Energy Vehicle Battery Energy-Storage MaterialsCollege of Chemistry and Materials ScienceAnhui Normal UniversityWuhu 241002AnhuiChina National Laboratory of Solid State Microstructures College of Engineering and Applied SciencesJiangsu Key Laboratory of Artificial Functional MaterialsCollaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210093JiangsuChina State Key Laboratory of Multiphase Complex Systems Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China School of Materials Science and Engineering Anhui UniversityHefei 230601AnhuiChina School of Energy and Power Engineering Jiangsu UniversityZhenjiang 212013JiangsuChina Department of Electrical Engineering Eindhoven University of TechnologyEindhoven MB 5600the Netherlands

The slow conversion of polyphase in lithium-sulfur(Li-S)batteries not only intensifies the shuttle effect of lithium polysulfides(LiPSs),but also causes the continuous accumulation of inactive sulfur species,resulting in rapid capacity attenuation and sluggish dynamic ***,the promoting effect of atomic interface stress on sulfur reaction was investigated via CoFe-CoFe_(2)O_(4)heterogeneous nanosheets with a cavity *** strain force induced by the in-situ precipitation of Co Fe bimetallic alloy in oxide matrix increased the d-band center,which was conducive to the interaction between catalyst and Li *** sulfur cathode based on this two-dimensional(2D)nanosheet design showed an extremely high capacity of 751 mAh g^(-1)at 4 *** with a sulfur loading of 5.55 mg cm^(-2),its area capacity was still as high as 7.15 mAh cm^(-2).Meanwhile,the enhanced stability greatly improved the practical potential of Li-S batteries.

关键词： 2D nanosheets In-situ precipitation Strain effect D-band center Li-S batteries

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Influence Of Oxygen In The Production Chain Of Metallic Glasses Via Laser Powder Bed Fusion

Influence Of Oxygen In The Production Chain Of Metallic Glas...

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World PM 2022 Congress and Exhibition

作者： Barreto, Erika Soares Wegner, Jan Frey, Maximilian Kleszczynski, Stefan Busch, Ralf Uhlenwinkel, Volker Mädler, Lutz Ellendt, Nils Leibniz Institute for Materials Engineering-IWT Bremen Germany Manufacturing Technology University of Duisburg-Essen Germany Metallic Materials Saarland University Germany Faculty of Production Engineering Particle and Process Engineering University of Bremen Germany

ISBN: (纸本)9781899072552

Laser powder bed fusion of metals (PBF-LB/M) is advantageous for manufacturing bulk metallic glasses with size and geometrical freedom. However, the oxygen uptake along the production chain can negatively impact the generation of high-quality, amorphous parts. In this context, Cu-Ti-based alloys were gas-atomized and additively manufactured using commercial and high purity feedstocks. The oxygen absorption in each processing step was tracked and related to the amorphous phase formation and glass-forming ability (GFA) of alloys. Results show an increasing oxygen absorption, considerably influenced by the starting feedstock, especially for commercial purity. In high purity material, the most contribution is inherent from the powder oxygen content. Results reveal the lack of influence of the oxygen content in the GFA. TEM analysis of commercial powder and PBF-LB/M sample show uniform and featureless micrographs, displaying the absence of oxygen-induced nucleation. The present contribution enhances the qualification and economic processability of amorphous metals by PBF-LB/M. © European Powder Metallurgy Association (EPMA)

关键词： Feedstocks

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Determination of the volume fraction of soot accounting for its composition and morphology 38th

Determination of the volume fraction of soot accounting for ...

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38th International Symposium on Combustion, 2021

作者： Kelesidis, Georgios A. Pratsinis, Sotiris E. Department of Mechanical and Process Engineering Particle Technology Laboratory Institute of Process Engineering Eth Zürich Sonneggstrasse 3 Zürich CH-8092 Switzerland

The soot volume fraction, fv, is essential for combustion engineering, air quality and climate modeling. It is commonly obtained from mobility or optical data assuming soot spheres of constant composition that tend to overestimate fvby up to an order of magnitude. Here, a method is presented for estimation of the fvfrom soot mobility or optical diagnostics data accounting for the realistic soot morphology and composition. With mobility data, the fvis determined by a relation for soot morphology (fractal-like structure) and the average primary particle diameter from microscopy, gas adsorption or power laws. Such fvand the corresponding soot volume/mass size distributions are in excellent agreement with accurate but tedious soot mass-mobility measurements in premixed flames along various heights above the burner (HAB) as well as from the exhaust of diffusion flames and diesel engines. With light extinction data, the fvis obtained by explicitly accounting for soot composition (through its optical band gap and refractive index, RI) and the light absorption enhancement (due to multiple light scattering within soot agglomerates) in the absorption function, E(RI). So as nascent soot matures by surface growth and agglomeration, its optical band gap decreases while its mobility diameter, carbon to hydrogen (C/H) ratio and fvincrease, increasing the soot E(RI) from 0.22 to 0.40, in excellent agreement with laser induced incandescence data from flat premixed ethylene flames. Using this variable E(RI), the soot fvfrom light extinction data in these flames is up to 50% lower than that using standard constant E(RI) for soot spheres. © 2021 Elsevier Ltd. All rights reserved.

关键词： Size distribution

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A Partitioned Scheme for Coupling of FEM and DEM Simulations of Granular Materials

A Partitioned Scheme for Coupling of FEM and DEM Simulations...

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92nd Annual Meeting of the International Association of Applied Mathematics and Mechanics, GAMM 2021

作者： Atrian, Amir Lund, Jorrid Radtke, Lars Skorych, Vasyl Dosta, Maksym Düster, Alexander Ship Structural Design and Analysis Hamburg University of Technology Hamburg21073 Germany Solids Process Engineering and Particle Technology Hamburg University of Technology Hamburg21073 Germany

In this contribution, a simple uniaxial compaction of granular materials is considered in preparation for studying the collision behavior of double-hull vessels filled with granular materials. The top compressing plate is deformable and modeled by the finite element method (FEM). The particles modeled using the discrete element method (DEM) are compressed by the top plate. To this end, a partitioned technique to couple the continuum approach (FEM) and particle discretization (DEM) is presented. Full agreement of the computed reaction force in DEM with the pressure applied on the top plate in FEM implies accuracy of the used coupling technique. © 2021 The Authors. Proceedings in Applied Mathematics & Mechanics published by Wiley-VCH GmbH.

关键词： Finite difference method

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Self-preserving size distribution and collision frequency of flame-made nanoparticles in the transition regime 38th

Self-preserving size distribution and collision frequency of...

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38th International Symposium on Combustion, 2021

作者： Kelesidis, Georgios A. Goudeli, Eirini Particle Technology Laboratory Institute of Process Engineering Department of Mechanical and Process Engineering Eth Zürich Sonneggstrasse 3 Zürich CH-8092 Switzerland Laboratory of Aerosol and Particle Technology Department of Chemical Engineering The University of Melbourne Parkville Melbourne VIC Australia

Coagulation of polydisperse primary particles is the dominant agglomerate growth mechanism in flame reactors and in the low-temperature or high-pressure regions of combustion engines. Here, the evolution of agglomerate size distribution (SD) and collision frequency function of coagulating soot and silica primary particles is investigated with simultaneous surface growth or coalescence using discrete element modeling (DEM). The growth of polydisperse soot and silica nanoparticles is captured from the free molecular up to the transition regime in excellent agreement with microscopy and mobility measurements in diffusion flames and flame spray pyrolysis (FSP) reactors. The broad agglomerate size distributions of soot and silica formed in the free molecular regime narrow by coagulation in the transition regime, attaining their mobility-based quasi-self-preserving or signature SD with the same geometric standard deviation of 1.48 ± 0.03, in excellent agreement with soot or silica SDs measured from diffusion flames and the CAST generator or from a FSP reactor, respectively. The coagulation rate of both soot and silica agglomerates is about twice as much higher as that of monodisperse agglomerates in the transition regime, regardless of material or combustion conditions. The DEM-derived collision kernel enhanced by a factor of 1.82 ± 0.35 can be interfaced with method of moments and monodisperse population balance models to improve the design of aerosol flame reactors and combustion engines. © 2021 Elsevier Ltd. All rights reserved.

关键词： Coagulation

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Influence of the number of flights on the dilute phase ratio in flighted rotating drums by PTV measurements and DEM simulations

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Particuology 2021年第3期19卷 171-182页

作者： Lanyue Zhang Zhaochen Jiang Jochen Mellmann Fabian Weigler Fabian Herz Andreas Bück Evangelos Tsotsas Department of Postharvest Technology Leibniz Institute for Agricultural Engineering and BioeconomyMax-Eyth-Allee 100Potsdam 14469Germany Thermal Process Engineering Otto von Guericke University MagdeburgUniversitaetsplatz 239106 MagdeburgGermany Institute of Particle Technology(LFG) FAU Erlangen-NurembergCauerstr.491058 ErlangenGermany Department of Applied Biosciences and Process Engineering Anhalt University of Applied SciencesBernburgerStr.5506366 KoethenGermany

particle distribution in the cross-section of the flighted rotating drum(FRD)is critical to the analysis of heat and mass transfer between gas and *** this work,the particle tracking velocimetry(PTV)method is applied to study the influence of the number of flights on the particle motion in *** drum,installed with 1,4,8,or 12 rectangular flights,is filled with plastic balls to 15%and operated at various rotating speeds ranging from 10 rpm to 30 *** results show that the number of flights has different effects on the holdup ratio and cascading rate of single flight and active *** 8 and 12 flights,the FRD produces a larger and more stable particle ratio of the dilute ***,DEM simulations agree with PTV measurements,whereas literature models show significant deviations.

关键词： Flighted rotating drum Number of flights Dilute phase PTV DEM

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Simulation of particle-Agglomerate Transport in a particle Filter using Lattice Boltzmann Methods

Simulation of Particle-Agglomerate Transport in a Particle F...

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22nd International Stuttgart Symposium, ISSYM 2022

作者： Hafen, Nicolas Krause, Mathias J. Dittler, Achim Gas Particle Systems Karlsruhe Institute of Technology Karlsruhe76131 Germany Lattice Boltzmann Research Group Karlsruhe Institute of Technology Karlsruhe76131 Germany Institute of Mechanical Process Engineering and Mechanics Karlsruhe Institute of Technology Karlsruhe76131 Germany Institute for Applied and Numerical Mathematics Karlsruhe Institute of Technology Karlsruhe76131 Germany Karlsruhe Institute of Technology Karlsruhe Germany

ISBN: (纸本)9783658370107

Wall-flow filters are used as particle filters in the exhaust gas after treatment of combustion engines. Soot is deposited in the filter and removed from it by regeneration through oxidation. However, an inert portion (ash) remains in the filter and forms different deposition patterns. Those patterns affect the separation efficiency as well as the overall pressure drop. The formation of deposition patterns is caused by rearrangement processes during regeneration, which result from the break-up of the particle layer as well as the resuspension and transport of individual agglomerates. With the help of the Homogenized Lattice Boltzmann Method (HLBM), resolved particle simulations are carried out within the framework of the open source software OpenLB. This allows the forces acting on the agglomerates to be determined and detachment and transport processes to be modelled. The focus of the present work is on a detailed investigation of the flow-induced transport of individual particle-agglomerates. © Springer Fachmedien Wiesbaden GmbH, ein Teil von Springer Nature 2022.

关键词： Wall flow

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Microprobe-based Terahertz Near-field Imaging of Highly Scattering Pharmaceutical Coatings on Small Tablets

Microprobe-based Terahertz Near-field Imaging of Highly Scat...

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International Conference on Infrared and Millimeter Waves

作者： Matthias Wolfgang Alexander Michalski Michael Nagel Simon Sawallich Martin Spoerk Johannes G. Khinast Research Center Pharmaceutical Engineering (RCPE) GmbH Graz Austria Protemics GmbH Aachen Germany Graz University of Technology Institute of Process and Particle Engineering Graz Austria

Pharmaceutical solid dosage forms can be inspected using terahertz time-domain spectroscopy systems. However, in many cases, the size, shape, and composition pose considerable challenges using classic far-field configurations. We demonstrate how these challenges can be overcome using microprobe-based THz near-field imaging in reflection-mode and a wavelet-based signal analysis algorithm. This technique reveals buried interface structures that were not resolvable before.

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The MP-PIC method for CFD-simulation of biomass gasification in a lab-scale fluidized bed 13

The MP-PIC method for CFD-simulation of biomass gasification...

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13th International Conference on Fluidized Bed technology, CFB 2021

作者： Dymala, Timo Hartge, Ernst-Ulrich Song, Tao Shen, Laihong Heinrich, Stefan Hamburg University of Technology Institute of Solids Process Engineering and Particle Technology Denickestrasse 15 Hamburg21073 Germany School of Energy and Mechanical Engineering Nanjing Normal University Nanjing210023 China Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education Southeast University Nanjing210096 China

ISBN: (纸本)9781771368506

Aim of the project "Multi-scale analysis and optimization of chemical looping gasification of biomass" of the Hamburg University of technology (TUHH) with the Southeast University (SEU) is the detailed modeling and subsequent optimization of a Chemical Looping Gasification (CLG) process. For this purpose, the process is simulated using the multiphase particle-in-cell (MP-PIC) method, which allows a detailed simulation of even large-scale units with affordable computational efforts. This paper deals with the implementation and validation of the reaction model for the gasification reactions. © 2021 CFB 2021 - Proceedings of the 13th International Conference on Fluidized Bed technology. All rights reserved.

关键词： Gasification

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On Identifiability and Model Validation of a Population Balance Model for Liquid-Liquid-Mixing ⁎

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IFAC-PapersOnLine 2025年第1期59卷 187-192页

作者： Terrance Wilms Daniel Topalovic Chrysoula Bliatsiou Jörn Villwock Matthias Kraume Andreas Bück Steffi Knorn Chair of Control Fak. III Technische Universität Berlin Germany Chair of Chemical and Process Engineering Fak. III Technische Universität Berlin Germany Institute of Particle Technology Friedrich-Alexander-Universität Erlangen-Nürnberg Germany

In this paper, liquid-liquid-mixer systems modelled by population balance equations are considered. As the control input / manipulated variable, the stirrer speed (and hence the energy dissipation rate) is used to control the distribution of the particle size. Three different measurement signals are considered. We investigate the observability and identifiability of the system for each measurement option and show that only in one scenario the model is observable and structurally identifiable. Further, it is shown that in this scenario, practical identifiability is generally challenging and particular care must be taken to ensure the model with identified parameter values is able to describe the dynamic behaviour of the system.

关键词： process Control Identifiability Observability Population Balance Equation Model Liquid/Liquid-Mixer Systems

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