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Unexpected Li displacement and suppressed phase transition enabling highly stabilized oxygen redox in P3-type Na layered oxide cathode

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Journal of Energy Chemistry 2023年第10期85卷 144-153,I0006页

作者： Myungeun Choi Hobin Ahn Hyunyoung Park Yongseok Lee Jinho Ahn Bonyoung Ku Junseong Kim Wonseok Ko Jungmin Kang Jung-Keun Yoo Duho Kim Jongsoon Kim Department of Energy Science Sungkyunkwan UniversitySuwon 16419Republic of Korea SKKU Institute of Energy Science and Technology(SIEST) Sungkyunkwan UniversitySuwon 16419Republic of Korea Carbon Composites Department Korea Institute of Materials Science(KIMS)Changwon 51508Republic of Korea Department of Mechanical Engineering(Integrated Engineering Program) Kyung Hee University1732Deogyeong-daeroGiheung-guYongin-siGyeonggi-do 17104Republic of Korea Department of KHU-KIST Convergence Science and Technology Kyung Hee University23Kyunghee-daero Dongdaemun-guSeoul 02447Republic of Korea

Oxygen redox is considered a new paradigm for increasing the practical capacity and energy density of the layered oxide cathodes for Na-ion batteries. However, severe local structural changes and phase transitions during anionic redox reactions lead to poor electrochemical performance with sluggish ***, we propose a synergy of Li-Cu cations in harnessing the full potential of oxygen redox, through Li displacement and suppressed phase transition in P3-type layered oxide cathode. P3-type Na_(0.7)[Li_(0.1)Cu_(0.2)Mn_(0.7)]O_(2) cathode delivers a large specific capacity of ~212 mA h g^(-1)at 15 mA g^(-1). The discharge capacity is maintained up to ~90% of the initial capacity after 100 cycles, with stable occurrence of the oxygen redox in the high-voltage region. Through advanced experimental analyses and first-principles calculations, it is confirmed that a stepwise redox reaction based on Cu and O ions occurs for the charge-compensation mechanism upon charging. Based on a concrete understanding of the reaction mechanism, the Li displacement by the synergy of Li-Cu cations plays a crucial role in suppressing the structural change of the P3-type layered material under the oxygen redox reaction, and it is expected to be an effective strategy for stabilizing the oxygen redox in the layered oxides of Na-ion batteries.

关键词： Layered oxide cathode Oxygen redox reaction Structural stability Li displacement No phase transition

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Erosion-corrosion resistance of Mo-Ti- and Ni-Cr-Mo-alloyed medium-carbon martensitic steels: a critical analysis of synergistic effect of erosion and corrosion

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Journal of Iron and Steel Research International 2022年第8期29卷 1299-1311页

作者： De-fa Li Hang-yu Dong Cheng-yang Hu Kai-ming Wu Serhii Yershov Oleg Isayev School of Mechanical and Vehicle Engineering West Anhui UniversityLuan 237012AnhuiChina The State Key Laboratory of Refractories and Metallurgy Hubei Province Key Laboratory of Systems Science on Metallurgical ProcessingInternational Research Institute for Steel TechnologyWuhan University of Science and TechnologyWuhan 430081HubeiChina Laboratory for Excellence in Advanced Steel Research Materials Science and Engineering ProgramDepartment of MetallurgicalMaterials and Biomedical EngineeringUniversity of Texas at El PasoEl PasoTX 79968USA

Grain refinement renders Mo-Ti-alloyed medium-carbon martensitic steel to exhibit high hardness,high strength,and good toughness,but the erosion-corrosion resistance of steel in a corrosive slurry environment is not ***-Ti-alloyed medium-carbon martensitic steel is compared with Ni-Cr-Mo-alloyed medium-carbon martensitic steel,and the erosion-corrosion resistance of those two steels under impingement by NaCl solution with gravels has been *** components,pure-corrosion rate,pure-erosion rate,and synergistic effect of erosion and corrosion(SEEC)of erosion-corrosion rate,were *** pure-corrosion and pure-erosion rates of Mo-Ti-alloyed steel were higher than those of Ni-Cr-Mo-alloyed one;however,its erosion-corrosion rate was relatively lower because of a weak *** plastic deformation and work hardening due to gravel impingement were the essential reason for SEEC,which could be reduced by grain refinement,and consequently,Mo-Ti-alloyed steel with finer grains had better erosion-corrosion *** refinement could be an effective way to improve the erosion-corrosion resistance of martensitic steels.

关键词： Grain refinement Mo-Ti alloying Ni-Cr-Mo alloying Martensite Erosion-corrosion

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Using a Composite Catalyst in the Gasification Process, In-Situ Plastic Waste is Converted to Energy

SSRN

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SSRN 2023年

作者： Abdelrahman, Ameen Nedil, Mourad Erchiqui, Fouad Material science Département School of Engineering Canada Mechanical Engineering Department Université du Québec en Abitibi-Témiscamingue Canada Master of Engineering Program School of Genius Canada

The world is eager to find a solution to reduce the phenomenon of climate change and transition to sustainable and renewable resources in all facets of our lives as we live in this period. Climate change and the emission of greenhouse gases are closely related issues. In that study, we focused on finding ways to reduce municipal management of plastic solid waste and conversion to enhance gases and solid carbon instead of direct incineration or disposal. In order to fracture a variety of plastic debris (PEHD, PELD, PVC, and PS) in a fixed bed reactor system, we created composite materials made of three transition metal oxides (manganese, titanium, and iron). These materials were built using layers of bentonite clay. To enrich and improve gas yields and product quality, the gasification reaction has been set up with customizable, parameter-optimized heating rate, loading, and reaction time settings. For the distribution of composites and products, many characterization techniques including XRD, TEM, SEM, GC, and EDX have been used (gas yield, and char weight ratio). © 2023, The Authors. All rights reserved.

关键词： Climate change

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Co-hydrothermal carbonization of polystyrene waste and maize stover combined with KOH activation to develop nanoporous carbon as catalyst support for catalytic hydrotreating of palm oil

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Carbon Resources Conversion 2024年第4期7卷 54-69页

作者： Napat Kaewtrakulchai Sirayu Chanpee Supachai Jadsadajerm Sutthipoj Wongrerkdee Kanit Manatura Apiluck Eiad-Ua Biomass Conversion Technology and Bioenergy Research Unit Kasetsart Agricultural and Agro-Industrial Product Improvement InstituteKasetsart UniversityBangkok 10900Thailand Department of Chemical Engineering School of EngineeringKing Mongkut’s Institute of Technology LadkrabangBangkok 10520Thailand Department of Industrial Chemistry Faculty of Applied ScienceKing Mongkut’s University of Technology North BangkokBangkok 10800Thailand Department of Physical and Material Sciences Faculty of Liberal Arts and ScienceKasetsart University Kamphaeng Saen CampusNakhon Pathom 73140 Thailand Department of Mechanical Engineering Faculty of Engineering at Kamphaeng SaenKasetsart UniversityKamphaeng Saen CampusNakhonpatom 73140Thailand College of Materials Innovation and Technology King Mongkut’s Institute of TechnologyBangkok 10520Thailand

Plastic waste is massively generated daily from households,mainly as packaging material,causing serious surrounding ecological *** development of plastic waste for higher value-added applications instead of landfilling and incineration has received consideration interest in bioenergy and material science ***,a nanoporous carbon support of nickel phosphide catalyst for palm oil hydrotreating was developed from blended polystyrene waste and maize stover via the Co-hydrothermal carbonization(HTC)coupled with the KOH activation *** Co-HTC parameters,such as temperature,reaction time,and PS percentage,were studied on the properties of co-hydrochar feedstocks for further activation using the Box behnken *** the comprehensive characterization results,response surface methodology(RSM)results showed that the rising polystyrene proportion significantly exhibited the higher production yield and fixed carbon of co-hydrochar products,an essential characteristic for porous carbon *** activation step,the final nanoporous carbon derived from the co-hydrochar(PMPC)exhibited the highest specific surface area of 1033.58 m^(2)/g with total pore volume of 0.45 cm^(3)/***,the PCMC-supported nickel phosphide catalysts were successfully synthesized and tested for the catalytic hydrotreating of palm oil as alternative *** NiP-PMPC catalyst represents an impressive liquid hydrocarbon yield of 74.68% with a high green diesel selectivity of 85.92% at 100% palm oil *** findings of this study might help develop and utilize blended plastic waste and agricultural waste as an alternate catalytic support for various processes in biofuel and biochemical synthesis.

关键词： Polystyrene Maize stover Co-hydrothermal carbonization Nanoporous carbon Catalytic hydrotreating

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An acoustofluidic scanning nanoscope using enhanced image stacking and processing

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Microsystems & Nanoengineering 2022年第4期8卷 191-198页

作者： Geonsoo Jin Joseph Rich Jianping Xia Albert JHe Chenglong Zhao Tony Jun Huang Thomas Lord Department of Mechanical Engineering and Material Science Duke UniversityDurhamNC 27708USA Department of Biomedical Engineering Duke UniversityDurhamNC 27708USA Department of Physics University of Dayton300 College ParkDaytonOH 45469USA Department of Electro-Optics and Photonics University of Dayton300 College ParkDaytonOH 45469USA

Nanoscale optical resolution with a large field of view is a critical feature for many research and industry areas,such as semiconductor fabrication,biomedical imaging,and nanoscale material *** scanning microscopes have been developed to resolve the inverse relationship between the resolution and field of view;however,those scanning microscopes still rely upon fluorescence labeling and complex optical *** overcome these limitations,we developed a dual-camera acoustofluidic nanoscope with a seamless image merging algorithm(alphablending process).This design allows us to precisely image both the sample and the microspheres simultaneously and accurately track the particle path and ***,the number of images required to capture the entire field of view(200×200μm)by using our acoustofluidic scanning nanoscope is reduced by 55-fold compared with previous ***,the image quality is also greatly improved by applying an alpha-blending imaging technique,which is critical for accurately depicting and identifying nanoscale objects or *** dual-camera acoustofluidic nanoscope paves the way for enhanced nanoimaging with high resolution and a large field of view.

关键词： image overcome stacking

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The planning strategy of robotics technology for nuclear decommissioning in Taiwan

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Nuclear engineering and Technology 2024年第1期56卷 64-69页

作者： Tu, Chung Yi Chen, Kuen Tsann Ting, Kuen Yang Sheng, Chin Doctoral Program in Data Science and Industrial Analytics National Chung Hsing University Taichung County 402 Taiwan Department of Applied Mathematics National Chung Hsing University Taichung County 402 Taiwan Department of Mechanical Engineering Lunghwa Univesity of Science and Technology Taoyuan County 33306 Taiwan

According to the market research report, the nuclear decommissioning services market is currently experiencing considerable growth, with a projected Compound Annual Growth Rate (CAGR) of nearly 13% during the 2020–2024 forecast period. This expansion is primarily fueled by the advancement of Industry 4.0, in conjunction with the emergence of cutting-edge technologies such as the Internet of Things, big data, artificial intelligence, and 5G. Even though the fact that robots have already been utilized in the nuclear industry, their adoption has been hindered by conservative regulations. However, the nuclear decommissioning market presents an opportunity for the advancement of robotics technology. The British have already invested heavily in encouraging the use of intelligent robots for nuclear decommissioning, and other countries, such as Taiwan, should follow suit. Taiwan's flourishing robotics development industry in manufacturing, logistics, and other domains can be leveraged to introduce advanced robotics in the decommissioning of its nuclear power plants. By doing so, Taiwan can establish itself as a competitive player in the nuclear decommissioning services market for the next two decades. © 2023 Korean Nuclear Society

关键词： Intelligent robotics Nuclear decommissioning Planning strategy

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Study on Removal Characteristics of Double-sided Rapid Polishing Machine

Study on Removal Characteristics of Double-sided Rapid Polis...

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2022 International Conference on Optical and Photonic engineering, icOPEN 2022

作者： Hailin, Guo Dasen, Wang Shijie, Zhao Siling, Huang Chaoxiang, Xia Xu, Zhang Inner Mongolia Metal Material Research Institute Inner Mongolia Baotou014030 China School of Mechanical Engineering Nanjing University of Science and Technology Jiangsu Nanjing210094 China Research Center of Laser Fusion China Academy of Engineering Physics Sichuan Mianyang621900 China

ISBN: (纸本)9781510661905

Double-sided rapid polishing machine is a new type of polishing equipment which utilizes the principle of chemical mechanical polishing and the shape precision copying mechanism to remove materials from the upper and lower surfaces of optical elements. To analyze the principle of double-sided rapid polishing machine, a material removal model based on Preston equation was established, and the relationship between the parameters such as eccentricity, rotational speed ratio and swing stroke and the material removal uniformity was obtained, which provided a theoretical basis for the double-sided rapid polishing process. With 430mm×430mm×10mm large diameter optical element as the experimental object, the double-sided rapid polishing test was carried out, and the precision index of surface shape accuracy λ/2 was obtained, which realized the high efficiency and high precision machining of plate optical element. © 2022 SPIE.

关键词： Polishing machines

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Pseudo-spinodal mechanism approach to designing a near-βhigh-strength titanium alloy through high-throughput technique

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Rare Metals 2021年第8期40卷 2099-2108页

作者： Li-Gang Zhang Jing-Lu Tang Zhen-Yu Wang Jing-Ya Zhou Di Wu Li-Bin Liu Patrick J.Masset School of Material Science and Engineering Central South UniversityChangsha410083China Key Laboratory of Nonferrous Metallic Materials Science and Engineering Ministry of EducationChangsha410083China State Key Laboratory of Powder Metallurgy Changsha410083China Faculty of Mechanical Engineering Koszalin University of TechnologyKoszalin75-453Poland

The main reason for the high strength in near-βtitanium alloys is the ultrafine precipitation of the acicular secondary a phase in theβ*** purpose of this study is to use the pseudo-spinodal mechanism to obtain the ultrafine a phase for the design of a new high-strength near-γtitanium *** calculations and TC21-(TC21+15 Mo)diffusion couple composition gradient experiments were used to demonstrate that TC21+3 Mo alloy can undergo a pseudo-spinodal decomposition to obtain the ultrafine a phase,resulting in a high-strength *** adjusting the heat treatment process to obtain a bimodal microstructure,the alloy exhibits a good balance between ultimate tensile strength(1351 MPa)and plasticity(8.5%strain).Thus,it was demonstrated that the pseudospinodal mechanism combined with a high-throughput diffusion couple technique is an effective method for designing high-strength titanium alloys.

关键词： High-strength titanium alloy TC21+xMo Diffusion couple Pseudo-spinodal mechanism Microstructure and mechanical properties

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Experimental investigation of weld joints manufactured at close proximity in S420 structural steel 1st

Experimental investigation of weld joints manufactured at cl...

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1st International Conference on Structural Damage Modelling and Assessment, SDMA 2020

作者： Larsson, Magnus Larsson, Mattias Ratnayake, R. M. Chandima Department of Mechanical and Structural Engineering and Material Science University of Stavanger Stavanger Norway

ISBN: (纸本)9789811591204

This manuscript presents the results from an experimental investigation performed to study the material and mechanical properties of two weld joints manufactured within close proximity. The experiment has been designed using seven welded S420G2 + M 500 × 300 × 15 mm structural steel plates, with varying distances between two parallel adjacent weld toes at 44, 12 and 1.3 mm. All these distances were less than the distance that has normally been recommended in standards, codes and specifications. A common requirement is four times the plate thickness, which in this experiment is 60 mm for a 15-mm-thick plate. The scope of the study was to analyze the effect the variation of distance had on the mechanical and material properties. A welding procedure specification was created and approved for the manufacturing of the weld joints. All subsequent welds were based on this welding procedure specification, in order to maintain conformance and uniformity. The non-destructive and destructive testing included: visual testing, radiographic examination, bending testing, Vickers hardness testing, Charpy V impact testing, tensile testing, as well as macro and microscopic examination. The results from the testing showed no adverse effects on the mechanical properties in the initial weld joint. This includes a complete heat-affected zone overlap in the specimen with 1.3 mm between the weld toes. These findings challenge the notion that the minimum distance requirements are based on metallurgical reasons. The outcome of this specific experimental setup can provide a baseline for performing further investigations. © Springer Nature Singapore Pte Ltd. 2021.

关键词： Tensile testing

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Scalable Arrays of Pneumatic Sensors for Multitouch Soft Skins

Scalable Arrays of Pneumatic Sensors for Multitouch Soft Ski...

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IEEE International Conference on Soft Robotics (RoboSoft)

作者： Xiaoran Zha Saurabh Jadhav Iman Adibnazari Yichen Zhai Michael T. Tolley Mechanical and Aerospace Engineering Department Materials Science and Engineering Program University of California San Diego San Diego CA USA

Soft robotic systems necessitate accurate and reliable sensor readings to detect environmental interactions and provide precise feedback for control. To be effective, soft sensors must exhibit sensitivity, reliability, repeatability, and flexibility. A versatile approach to sensing for soft robots uses soft air-filled deformable structures with pressure transducers to detect pressure changes due to applied forces. However, the common approach of employing one pressure transducer per sensing chamber limits the scalability of this sensing approach (e.g., for large arrays able to detect touch at many locations). Here we present an approach to the design of pneumatic sensor arrays that reduces the number of required transducers. We develop mathematical models to analyze the pressure variations within the sensor arrays in response to applied forces at various locations. We also introduce a method of rapidly fabricating sensor arrays by laminating elastomeric sheets patterned with laser-cut sacrificial layers. We then use our model to optimize the geometry of the sensors and evaluate the results experimentally. Finally, we devise an algorithm capable of determining the location of multiple touches anywhere within the sensor array. This work represents a step towards the practical application of soft pneumatic sensors, particularly for robotic sensing and haptic devices, enhancing the safety of human-robot interactions.

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