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MOF-derived spinel NiCo 2 O 4 anchored single-walled carbon nanotubes nanocomposite as potential anode materials for Na-ion batteries

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Electrochimica Acta 2025年

作者： S. Kishore Babu Pei-Jun Wu Wei-ren Liu Department of Chemical Engineering R&D Center for Membrane Technology Chung Yuan Christian University Taoyuan City 320314 Taiwan Hierarchical Green-Energy Materials (Hi-GEM) Research Center National Cheng Kung University 1 University Road Tainan 70101 Taiwan Department of Chemical Engineering Faculty of Engineering Chulalongkorn University Bangkok 10330 Thailand

Spinel NiCo 2 O 4 is a promising anode material for sodium-ion batteries due to its high theoretical capacity. However, it often suffers from inherent limitations such as poor electrical conductivity and significant structural instability during cycling, which hinder its practical application. Single-walled carbon nanotubes (SWCNTs) are employed to create an advanced composite to address these challenges and enhance their electrochemical performance. This work successfully synthesized an SWCNT-anchored NiCo 2 O 4 spinel composite derived from a metal-organic framework (MOF) via a solvothermal process. The strategic incorporation of SWCNTs significantly improves the electrochemical properties of NiCo 2 O 4 for high-performance Na-ion battery applications. Electrochemical analysis reveals that the NiCo 2 O 4 /SWCNTs composite displays an initial reversible capacity as high as 862 mAh/g at 0.1 A/g. Impressively, even after 500 cycles at 0.2 A/g, it retains a high reversible sodiation capacity near 552 mAh/g, substantially outperforming pristine NiCo 2 O 4 (315 mAh/g under the same conditions). Furthermore, the composite demonstrates excellent rate capability, delivering 385 mAh/g at 1 A/g after 200 cycles and 154 mAh/g at 5 A/g after 200 cycles, respectively. This superior electrochemical performance is attributed to the synergistic effects of SWCNTs, which enhance electrical conductivity, buffer volume changes, inhibit particle agglomeration, and help maintain structural integrity during long-term cycling, directly mitigating the inherent drawbacks of NiCo 2 O 4 . These results underscore that the MOF-derived NiCo 2 O 4 /SWCNTs composite holds significant potential as an anode material for next-generation Na-ion batteries, offering high capacity, exceptional stability, and excellent rate performance crucial for advanced energy storage systems.

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Evaluation of Alpha-case in Titanium Castings

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Journal of Materials Science & technology 2008年第1期24卷 70-74页

作者： Si-Young Sung Bong-Jae Choi Beom-Suck Han Han-dun Oh Young-Jig Kim Materials & Processing Engineering Center R&D Division Korea Automotive Technology InstituteChonanChungnamKorea Department of Advanced Materials Engineering Sungkyunkwan University SuwonKorea Department of Materials Science Hanseo University Seosan 352-820Korea

The alpha-case formation reactions between Ti and investment molds （Al-2O-3,ZrSiO-4,ZrO-2,CaO stabilized ZrO-2） were evaluated in a plasma arc melting *** of thermodynamic approaches,there were distinct alpha-case *** reaction products were characterized by electron probe micro-analysis and transmission electron ***α-case generation between Ti and Al-2O-3 mold was not able to be explained by the conventionalα-case formation mechanism,which is known to be formed by the interstitials,especially oxygen dissolved from mold ***,from our experimental results and thermodynamic calculations,it was confirmed that theα-case is formed not only by an interstitial element but also by substitutional metallic elements dissolved from mold *** newly establishedα-case formation mechanism will surely lead to a variety of significant applications of theα-case controlled Ti casting.

关键词： Titanium Casting Alpha-case Net-shape

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Experimental research regarding the Flow Pattern and Pressure drop in a Slurry Composed of Polypropylene-Particles 9

Experimental Research Regarding the Flow Pattern and Pressur...

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9th International Conference on Advances in Machinery, Materials Science and engineering Applications, MMSE 2023

作者： Fan, Jinchao Xu, Zhaohui Fang, Chao Lin, Zili Cnpc Engineering Technology R&d Company Limited China National Engineering Research Center for Oil and Gas Drilling and Completion Technology China

ISBN: (纸本)9781643684383

Pipelines used for product transportation require regular cleaning. A new method has emerged using slurry for the cleaning process, during which the flow pattern and pressure drop in the slurry are essential. The flow of slurry containing polypropylene particles was investigated using a laboratory-scale, closed-circuit pipeline facility. While the slurry was pumped, the pressure drop was measured, and the flow pattern was observed regarding particle type, slurry particle concentration, and slurry flow velocity. The results showed that after the critical flow velocity, the particles mixed uniformly with the water in the pipe, increasing the pressure drop in conjunction with the flow velocity. Although a higher particle mass fraction and small particle size reduced the critical flow velocity, the mass fraction and particle size had no significant influence on the pressure drop. This research establishes a solid foundation for the practical application of this cleaning method. © 2023 The Authors.

关键词： Flow patterns

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Microstructural features and mechanical properties of 22MnB5 hot stamping steel in different heat treatment conditions

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JOUrNAL OF MATErIALS rESEArCH ANd technology-JMr&T 2020年第5期9卷 10901-10908页

作者： Cavusoglu, Onur Cavusoglu, Oktay Yilmazoglu, Ahmet Gurkan Uzel, Ugur Aydin, Hakan Gural, Ahmet Gazi University Faculty of Technology Department of Manufacturing Engineering Ankara Turkey TOFAŞ Turkish Automobile Factory R&D Center Bursa Turkey Bursa Uludağ University Faculty of Engineering Department of Mechanical Engineering Bursa Turkey Gazi University Faculty of Technology Department of Metallurgical and Materials Engineering Ankara Turkey

In this study, the microstructure and mechanical properties of the 22MnB5 steel sheet wereinvestigated in different heat treatment conditions. The steel sheet heated to 700 degrees C, 800 degrees C, and 900 degrees C was subjected to air cooling, water quenching, and water quenching + temperingprocedures. Microstructural properties post-heat treatment were analyzed under an opticalmicroscope. To determine the mechanical properties, uniaxial tensile tests, and hardnessmeasurements were performed. The highest mechanical properties were achieved with thewater quenching from 800 degrees C and 900 degrees C. The elongation value was ranged of 2-4% with thewater quenching. Also, the tempering process slightly increased the elongation value. (C) 2020 The Author(s). Published by Elsevier B.V.

关键词： Hot stamping 22MnB5 Heat treatment Quenching Mechanical properties

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Analysis of Low-Pressure Operation Stability of Underground Hydrogen Storage Salt Cavern 56

Analysis of Low-Pressure Operation Stability of Underground ...

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56th U.S. rock Mechanics/Geomechanics Symposium

作者： dong, Jingnan Zhuang, Xiaoqian Gong, danni Ban, Fansheng Zhang, Yingbin CNPC Engineering Technology R&D Company Limited Beijing China China University of Petroleum-Beijing Beijing China HydroChina-ITASCA R&D Center Hangzhou China

ISBN: (纸本)9780979497575

In order to meet today's increasing fluctuations in energy demand, large-scale underground salt rock gas storage is widely used in the storage of fuels, including natural gas, oil and hydrogen. From the perspective of macroscopic structure and stratigraphic structure, the Jintan salt deposit in China has good sealing properties, and is an ideal solution mining area for the construction of salt rock gas storage. Salt rock has extremely low permeability and self-repairing properties, which greatly increase the sealing performance of the gas storage. Underground salt cavern hydrogen storage has been proved feasible in some area worldwide. The molecular weight of hydrogen is extremely low, so it has high requirements on the sealing performance of hydrogen storage, especially in terms of long-time storage. In this paper, two geo-mechanical models are established as one single-cavern configuration and 4-cavern configuration to analyze the stability of the hydrogen storage in terms of cavity volume shrinkage, stress distribution of rock mass around caverns, and surface subsidence. Through numerical simulation using FLAC3d, the evolution law under long-time low-pressure conditions is investigated. The tightness and stability of the trap conditions of the salt interval are studied, and the reasonable low operating pressure range of the salt rock hydrogen storage is proposed. The study found that under the condition of ensuring the stability of the salt cavity, the gas storage should keep the operating pressure from 8 MPa to 9 MPa at the depth around 800 to 1000 m. The long-term constant pressure operation at lower and higher limit did not see obvious salt cavity tensile stress concentration areas within 30 years, and the salt cavity expansion area was concentrated in the local area. For most salt cavern hydrogen storages of 800 to 1000 meters depth, 8.27 MPa is an acceptable operational pressure. Considering the surface subsidence, it is necessary to pay more attention when

关键词： Mining

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Feasibility Study on Environmental Adaptability Test Platform of rescue drilling rig 4

Feasibility Study on Environmental Adaptability Test Platfor...

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2021 4th International Conference on Advanced Materials, Intelligent Manufacturing and Automation, AMIMA 2021

作者： dong, Fan Feifei, Lu Drilling Technology and Equipment R&D Center Xi'An Research Institute China Coal Technology and Engineering Group Xi'an China

The environmental adaptability test platform of rescue rig mainly studies the environmental adaptability of ground and underground emergency rescue rig, lifting and rescue cabin and other equipment. It provides verification means and standard basis for safety, and improves the reliability and adaptability of drilling rescue technology and equipment. It provides a platform for emergency rescue drill, actual operation and scenario simulation. After the completion of the platform, it has reached the international advanced level. © Published under licence by IOP Publishing Ltd.

关键词： Infill drilling

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Mild stir-assisted membrane dispersion for enhancing propionic acid extraction

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Chinese Journal of Chemical engineering 2019年第11期27卷 2666-2674页

作者： Xiaoyan Zheng dong Feng Liangrong Yang Junfeng Hui Jiemiao Yu Qiyu Meng Huizhou Liu daidi Fan Shaanxi Key Laboratory of Degradable BiomedicalMaterials Shaanxi R&D Center of Biomaterials and Fermentation EngineeringSchool of Chemical and EngineeringNorthwest UniversityXi'an710069China College of Life Sciences Northwest UniversityXi'an710069China Key Laboratory of Green Process and Engineering State Key Laboratory of Biochemical EngineeringInstitute of Process EngineeringChinese Academy of SciencesChinese Academy of Sciences UniversityBeijing 100190China

Mild stir-assisted membrane dispersion extraction(MdE) method was employed to enhance propionic acid(HA)extraction and compared to the mechanical stirred extraction(MSE) method. Triocylamine(TOA) and tributyl phosphate(TBP) were chosen as model extractant to extract HA. Firstly, droplet size and the size distribution of organic phase were analyzed, and then the effects of phase ratio, extractant and HA concentration on extraction performance were investigated. Comparing the two extraction methods, the results show mild stir-assisted MdE method reduced the mass transfer equilibrium time compared to MSE method. The mass transfer mechanism was explored by analyzing mass transfer resistance. Mild stir-assisted MdE had less total mass transfer resistance than MSE. When the extractant concentration was 40%, the extraction process was controlled by organic phase mass transfer process with HA volume fraction was 1% and controlled by both of reaction process and organic phase mass transfer process when HA concentration increased to 5%. This work may provide a new type of extraction method for the recovery of organic carboxylic acid.

关键词： Membrane dispersion extraction Propionic acid Triocylamine Tributyl phosphate

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Microstructure analysis of AISI 304 stainless steel produced by twin-roll thin strip casting process

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Journal of University of Science and technology Beijing 2007年第5期14卷 420-424页

作者： Zhenmin Wang Yuan Fang Junjie Qi Yue Zhang Yan Yu Jianchun Wu State Key Laboratory for Advanced Metals and Matefiai University of Science and Technology Beijing Beijing 100083 China R＆D Center Baosteel Advanced Technology Institute Shanghai 201900 China School of Material Science and Engineering University of Science and Technology Liaoning Anshan 114044 China

The microstructure of AISI 304 austenlte stainless steel fabricated by the thin strip casting process were investigated using optical microscope, scanning electron microscope （SEM）, transmission electron microscope （TEM）, and X-ray diffraction （Xrd）. The microstructures of the casting strips show a duplex structure consisting of delta ferrite and austenite. The volume fraction of the delta ferrite is about 9.74vo1% at the center and 6.77vo1% at the surface of the casting thin strip, in vermicular and hand shapes. On account of rapid cooling and solidification in the continuous casting process, many kinds of inclusions and precipitates have been found. Most of the inclusions and precipitates are spherical complex compounds consisting of oxides, such as, SiO2, MnO, Al2O3, Cr2O3, and FeO or their multiplicity oxides of ***2O3, ***2, and ***2. Many defects including dislocations and stacking faults have also formed during the rapid cooling and solidification process, which is helpful to improve the mechanical properties of the casting strips.

关键词： austenite stainless steel casting thin strip morphology microstructure

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Estimation of AC Breakdown Strength of Epoxy/TiO2Nanocomposite using Electron Avalanche Breakdown Model

Estimation of AC Breakdown Strength of Epoxy/TiO2Nanocomposi...

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2022 IEEE International Conference on High Voltage engineering and Applications, ICHVE 2022

作者： Tagawa, Kazuma Kurimoto, Muneaki Sawada, Toru Yoshida, Shigeyoshi Umemoto, Takahiro Mabuchi, Takahiro Muto, Hirotaka Nagoya University Department of Engineering Japan Advanced Technology R&d Center Mitsubishi Electric Corporation Japan

ISBN: (数字)9781665407502

ISBN: (纸本)9781665407502

Large agglomerates are dielectric defects in nanocomposites, which are polymer matrix added nanoparticles. However, a method for quantifying the critical agglomerate size to improve the dielectric breakdown strength of nanocomposites has not yet been established. In this study, the dependence of the AC breakdown strength on the agglomerate size of epoxy/TiO2 NC is estimated using an electron avalanche breakdown model. © 2022 IEEE.

关键词： Nanocomposites

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Kinetic and equilibrium study of the chromatographic separation of glycine and ammonium

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Bioresources and Bioprocessing 2014年第1期1卷 239-248页

作者： Lihua Jiang Huiyuan Liu Yongjun Qiu Yaosong Wang Chaoqin Chen Qifan Wang Liming Zhao State Key Laboratory of Bioreactor Engineering R&D Center of Separation and Extraction Technology in Fermentation IndustryEast China University of Science and TechnologyShanghai 200237China College of Mechanical and Electrical Engineering Beijing University of Chemical TechnologyBeijing 100029China

Background:Glycine is extensively applied in the field of food,medicine,agrochemistry,*** is usually commercially produced by the chemosynthesis method,which generates large amounts of by-product ammonium ***:In this paper,the separation of glycine and ammonium chloride was performed with chromatographic column,and deionized water as *** adsorption equilibrium constant K of glycine and ammonium chloride was evaluated by frontal *** on the equilibrium-dispersive model and a linear driving force of chromatography,the overall mass transfer coefficient km,axial dispersion coefficient d_(L),and bed voidageεt of the column were obtained by moment ***:At 50℃,the equilibrium constants measured were found to be 0.72 and 0.19 for glycine and ammonium chloride,*** 60℃,the equilibrium constants increased to 0.80 and 0.21 for glycine and ammonium chloride,*** value of axial dispersion coefficient d_(L) of glycine had the same order of magnitude with ammonium chloride and was about two times larger than that of ammonium *** km at 50℃and 60℃were 1.30 and 0.77 and 2.41 and 0.84 min−1 for glycine and ammonium chloride,***:The obtained parameters used to simulate the elution curve and the simulation and experimental results matched well,which showed that the parameters obtained were *** results make foundation for further study on large-scale separation of glycine from ammonium chloride by SMB chromatography.

关键词： Glycine Ammonium chloride Equilibrium Kinetics Chromatography Simulation

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