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A strong and plastic Fe-based composite alloy with extremely high saturation magnetic flux density by constructing multiscale heterogeneous structure

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Journal of materials Science & technology 2026年 240卷 156-165页

作者： Zhilin Wen Xiao Liu Siyi Di Lichen Liu Liliang Shao Yuqiang Yan Zhengwu Peng Jing Zhou Haibo Ke Liejun Li Weihua Wang Guangdong Key Laboratory for Advanced Metallic Materials Processing South China University of Technology Guangzhou 510640 China Songshan Lake Materials Laboratory Dongguan 523808 China Xinjiang Key Laboratory of Solid State Physics and Devices Xinjiang University Urumqi 830046 China Department of Materials Science Engineering College of Science and Engineering City University of Hong Kong Hong Kong 999077 China

For power electronic devices in high-energy-density and under mechanically demanding loading conditions, soft magnetic materials with high saturation magnetic flux density ( B s ) and superior mechanical properties are needed. Yet, conventional Fe-based metallic glass is often constrained by poor formability, limited plasticity and relatively low B s . This work introduces an innovative approach to fabricating amorphous-crystalline composites, achieved by ball milling hybridizing amorphous and crystalline powders, followed by spark plasma sintering. Through controlled elemental diffusion during sintering, the composite evolves into a phase-separated structure with densely packed interfaces composed of dual nanoscale grains. The resultant material not only exhibits remarkable compressive strength (i.e., a yield strength close to 1.4 GPa) and exceptional plasticity (17.1 %) but also attains a sufficiently high B s (2.0 T) with a low coercivity (245 A/m). Within our composites, deformation is deftly managed by diverse heterogeneous structures, where the synergistic effects of dislocation slip and nanotwinning effectively forestall catastrophic fracture. This research aspires to harmonize mechanical and magnetic properties by strategically constructing multiscale architectures.

关键词： Fe-based metallic glass Mechanical property High saturation magnetic flux density Saturation magnetic flux density

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Electronic and Li-ion diffusion properties in Fe0.875M0.125S2 (M=Ti, V)(001)|Li2S(110) interface by the First-principles study

SSRN

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SSRN 2024年

作者： Liu, Baogang Wei, Chengdong Zhao, Fenning Xu, Jian Li, Jihong Xue, Hongtao Tang, Fuling School of Materials Science and Engineering Lanzhou University of Technology Lanzhou730050 China State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals Lanzhou University of Technology Lanzhou730050 China

The structure and nature of the interface between the electrode and the discharge product have an important impact on the performance of Lithium-sulfur (Li-S) batteries. To investigate the effect of doping on the high-rate performance at interfaces. Using the first-principles calculations, we have investigated the interface between FeS2(001) with doping transition metal Ti and V, and Li2S(110). The investigation covered aspects such as lattice structure, electrochemical properties, diffusion of Li+ at the interface, distribution of charge, and work function. The results indicate that doping with transition metals Ti and V reduces the Li+ diffusion barrier. The interfacial density of states introduces metallic properties. Additionally, analysis of work function revealed that Ti doping promotes the establishment of an internal electric field in the interfacial structure which accelerates cycling and migration of Li+. This study enhances our understanding of interfacial structure and electrochemical properties between cathode host material and Li2S. © 2024, The Authors. All rights reserved.

关键词： Lithium sulfur batteries

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Effect of pH, milling time, and Isobam content on porous silicon nitride ceramics prepared by gel casting

Advanced Powder Materials

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advanced Powder materials 2023年第1期2卷 100-107页

作者： Hailing Yang Zhi Wang Mengyong Sun Fei Chen Jun Ji Sique Chen Yingying Chen Deli Ma Zhenyu Zhang Baocai Pan Yulin Wei Qinggang Li Shandong Provincial Key Laboratory of Preparation and Measurement of Building Materials University of JinanJinan 250022China School of Material Science and Engineering University of JinanJinan 250022China No.52 Institute of China North Industry Group Yantai 264003China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China

As a non-toxic copolymer of isobutylene and maleic anhydride,Isobam is successfully used as a dispersant and a gelling agent for fabricating porous Si_(3)N_(4) ceramics by gel *** dispersity and rheological properties of the Si_(3)N_(4) slurry are influenced by the pH,milling time,and Isobam content which varies from 0.1 wt.%to 0.6 wt.%,and these factors are *** slurry with 40 vol.%solid content and milled for 4 h has a high zeta potential at pH 12(adjusted by Tetramethyl ammonium hydroxide(TMAH)),which means that the particles are well *** mechanisms of TMAH are electrostatic repulsion and steric *** viscosity of the slurry increases with the increase of Isobam *** pressureless sintering at 1700℃ for 2 h,a uniform unique interlocking microstructure of rod-like β-Si_(3)N_(4) grains is observed,which may improve the flexural strength of the ceramics by intergranular fracture and particle pullout of β-Si_(3)N_(4) *** density and porosity of the samples fluctuate negligibly with the increase of Isobam content,and the Si_(3)N_(4) ceramic with 0.1 wt.% Isobam exhibits the highest bending strength of 251.6 MPa among all samples.

关键词： Si_(3)N_(4)ceramics Viscosity Zeta potential Gel casting Isobam

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Na doping and CeO2 surface modification enhancing the Li-rich Li1.2Mn0.54Ni0.13Co0.13O2 cathode material for lithium-ion battery

SSRN

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SSRN 2024年

作者： Li, Yu Feng, Xiang-Yu Ran, Mao-Jin Yuan, Man-Man Wei, Mei-Tong Wu, Liang Hu, Zhi-Yi Chen, Li-Hua Su, Bao-Lian State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China Wuhan University of Technology Wuhan430070 China School of Automotive Engineering Xiangyang Polytechnic 18 Longzhong Road Hubei Xiangyang441050 China University of Namur NamurB-5000 Belgium

Li-rich Mn-based layered oxides with high specific capacity and operating voltages become one of the most promising materials for lithium-ion batteries (LIBs). However, it still faces several issues on low initial coulombic efficiency, poor electronic conductivity and voltage fading due to oxygen release and transition metals rearrangement during cycling. In this study, Li1.2Mn0.54Ni0.13Co0.13O2 (LMR) cathode material with Na ion doping (LMNaR) and CeO2 surface modification (LMNaR@CeO2) is prepared to realize the synergistic modification effect. The doping of Na ions enlarges Li layer spacing to effectively promote the insertion and extraction of lithium ions, which makes the layered structure more stable to reduce the effect of phase transition. And the CeO2 surface modification restrains the side reactions between electrode and electrolyte, and stabilizes lattice oxygen and eases oxygen release. As a result, the LMNaR@CeO2 displays a specific capacity of 196 mAh·g-1 after 100 cycles at 0.5 C with a capacity retention of 94% and a merely voltage decay of 0.16 V, which are much better than the LMR with a specific capacity of 159.6 mAh·g-1 and only a 79% capacity retention. Our strategy here provides a feasible approach for the development of Li-rich Mn-based anode materials for long life LIBs. © 2024, The Authors. All rights reserved.

关键词： Lithium-ion batteries

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Twin crystal structured Al-10 wt.% Mg alloy over broad velocity conditions achieved by high thermal gradient directional solidification

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Journal of materials Science & technology 2021年第12期71卷 152-162页

作者： Luyan Yang Shuangming Li Kai Fan Yang Li Yanhui Chen Wei Li Deli Kong Pengfei Cao Haibo Long Ang Li Institute of Microstructure and Properties of Advanced Materials Faculty of Materials and ManufacturingBeijing University of TechnologyBeijing100124China State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi’an710072China Ernst Ruska-Centre for Microscopy and Spectroscopy with Electrons Forschungszentrum Jülich52428JülichGermany

Twin crystal structured Al-10 wt.% Mg alloys that were grown over a broad solidification velocity range were prepared and studied for the first *** high thermal gradient(G)and growth velocity(V)of directional solidification resulted in the dominant solidification of twins:the twinned dendrite trunks at constant high Vs curved in the G direction with large angles in 7 mm diameter crucibles and invaded regular columnar grains because of a distinct kinetics growth *** deceleration experiments were designed to produce twin crystals that evolved with lower values of V(100,10,and 0.5μm/s)and had a structural coarsening *** cell growth in the absence of arms occurred at a growth velocity of 10μm/s.A coherency loss was observed at a growth velocity of 0.5μm/s with straight coherent twin boundaries turning into curved incoherent *** theoretical analyses were performed to understand the structural evolution of the *** results demonstrate the possibility of producing dense and controlled twin crystals in the Al-Mg system under most industrial production conditions;thus,this approach can be a new structural choice for designing Al-Mg-based alloys that have widespread commercial applications.

关键词： Directional solidification Aluminum alloy Microstructural evolution Feathery crystals Twinned dendrites

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Development of innovative and green adsorbents for in situ cleanup of fluoride-polluted groundwater: Mechanisms and field-scale studies

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Chemosphere 2024年 350卷 141035页

作者： Ou, Jiun-Hau Wang, Chih-Chieh Verpoort, Francis Chien, Chih-Ching Zhong, Hua-Bin Kao, Chih-Ming Institute of Environmental Engineering National Sun Yat-Sen University Kaohsiung Taiwan Hershey Environmental Technology Corp. Ltd. Kaohsiung Taiwan State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan China Graduate School of Biotechnology and Bioengineering Yuan Ze University Chung-Li City Taoyuan Taiwan

In this study, the magnesium oxide (MgO)-based adsorbents [granulated MgO aggregates (GA-MgO) and surface-modified MgO powder (SM-MgO)] were developed to remediate a fluoride-contaminated groundwater site. Both GA-MgO and SM-MgO had porous, spherical, and crystalline structures. Diameters for GA-MgO and SM-MgO were 1–1.7 mm and 1–10 μm, respectively. The pseudo second-order dynamic adsorption and the Freundlich isotherm could be applied to express the chemical adsorption phenomena. The monolayer adsorption was the dominant mechanism at the initial adsorption period. During the latter part of fluoride adsorption, the multilayer adsorption became the dominant mechanism for fluoride removal from the water phase, which also resulted in the increased adsorption capacity. Higher hydroxide, phosphate, and carbonate concentrations caused a decreased fluoride removal efficiency due to the competition of sorption sites between fluoride and other anions with similar electronic properties. Fluoride removal mechanism using GA-MgO and SM-MgO as the adsorbents was mainly carried out by the chemical adsorption. Reaction paths contained two main processes: (1) formation of magnesium hydroxide after the reaction of MgO with water, and (2) the hydroxyl group of the magnesium hydroxide was replaced by fluoride ions to form magnesium fluoride precipitation. Results from column tests show that up to 61 and 73% of fluoride removal (initial fluoride concentration = 9.3 mg/L) could be obtained after 50 pore volumes of groundwater pumping with GA-MgO and SM-MgO injection, respectively. The GA-MgO system could be applied to contain and remediate fluoride-contaminated groundwater, and SM-MgO could be applied as an immediate fluoride removal alternative to achieve a rapid pollutant removal for emergency responses. Up to 71% of fluoride removal (fluoride concentration = 10.8 mg/L) could be obtained with GA-MgO injection after 30 days of operation. The developed GA-MgO system is a potential and g

关键词： Magnesia

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Na Doping and Ceo2 Coating Enhancing the Li-Rich Li1.2mn0.54ni0.13co0.13o2 Cathode Material for Lithium-Ion Battery

SSRN

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SSRN 2024年

作者： Li, Yu Feng, Xiang-Yu Ran, Mao-Jin Yuan, Man-Man Peng, Yan Luo, Bi-Cheng Wei, Mei-Tong Wu, Liang Hu, Zhi-Yi Chen, Li-Hua Su, Bao-Lian State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China Wuhan University of Technology Wuhan430070 China School of Automotive Engineering Xiangyang Polytechnic 18 Longzhong Road Hubei Xiangyang441050 China University of Namur NamurB-5000 Belgium

Li-rich Mn-based layered oxides with high specific capacity (>250 mAh·g-1) and operating voltages become one of the most promising materials for lithium-ion batteries (LIBs). However, it still faces several issues on low initial coulombic efficiency, poor electronic conductivity and voltage fading due to oxygen release and transition metals rearrangement during cycling. In this study, Li1.2Mn0.54Ni0.13Co0.13O2 (LMR) cathode material with Na ion doping (LMNaR) and surface CeO2 coating (LMNaR@CeO2) is successfully prepared via a simple co-precipitation and wet chemical to realize the synergistic modification effect. On one hand, the doping of Na ions enlarges Li layer spacing to effectively promote the insertion and extraction of lithium ions. Meanwhile, due to the larger radius of Na ions, the layered structure becomes more stable, thus reducing the effect of phase transition. On the other hand, the CeO2 coating layer restrains the side reaction between electrode and electrolyte, and stabilizes lattice oxygen and eases oxygen release. The electrochemical results illustrate that the LMNaR@CeO2 exhibits outstanding electrochemical capabilities. Notably, it displays a specific capacity of 196 mAh·g-1 after 100 cycles at 0.5 C with a capacity retention of 94% and a merely voltage decay of 0.16 V, which are much better than the LMR with a specific capacity of 159.6 mAh·g-1 and only a 79% capacity retention. Our strategy here provides a feasible approach for the development of Li-rich Mn-based anode materials for long life LIBs. © 2024, The Authors. All rights reserved.

关键词： Lithium-ion batteries

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Experimental Probing of the Effect of Nafion Poisoning at Different Pt Loadings in a Pemfc

SSRN

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SSRN 2022年

作者： Zhou, Fen Zhang, Hui Guan, Shumeng Li, Guangfu Xia, Lei Pan, Mu Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory Xianhu Hydrogen Valley Foshan528200 China State Key Laboratory of Advanced Technology for Materials Synthesis Processing Wuhan University of Technology Wuhan430070 China

The charge-transfer resistance ( R ct ) in electrochemical impedance spectroscopy (EIS) was applied as an activity indicator to study the suppression of a rotating disk electrode (RDE) and membrane electrode assembly (MEA) by Nafion with different Pt loadings. Use of the R ct avoids uncertainty in activity characterization;such uncertainty is caused by mass transfer in highly loaded catalyst agglomerates. It was found that Nafion had a stronger poisoning effect at lower Pt loadings. The simultaneous reduction in the working voltage further aggravates the poisoning, especially under low-Pt conditions. After poisoning, the normalized R ct at 20 µg/cm 2 increased from 8 times at 0.9 V to 21 times at 0.82 V. When the Nafion adsorption coverage on the surface of Pt remained constant, the suppressed activity increased as the Pt loading decreased. Therefore, it is critical to consider Nafion poisoning when constructing MEAs with low platinum and take appropriate strategies to alleviate poisoning and achieve high-performance output. © 2022, The Authors. All rights reserved.

关键词： Proton exchange membrane fuel cells (PEMFC)

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Carbon nanotubes modified MXene film as a high-performance electrode for supercapacitor

Carbon nanotubes modified MXene film as a high-performance e...

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2022 International Conference on Optoelectronic Information and Functional materials, OIFM 2022

作者： Wang, Yesheng Kong, Dongqing Cui, Yongpeng Xing, Wei State Key Laboratory of Heavy Oil Processing School of Material Science and Engineering China University of Petroleum Qingdao266580 China Weifang Key Lab of Advanced Light Materials Manufacturing and Forming Weifang University of Science and Technology Weifang262700 China

ISBN: (数字)9781510655126

ISBN: (纸本)9781510655119

As a new family of 2D material, MXene has shown a huge potential in the application of supercapacitor because of their superior conductivity, abundant active sites and the stable layered structure. However, the electrochemical performance of MXene-based electrodes is limited by the stacking of the nanosheets. Herein, the flexible carbon nanotube (CNT) modified Ti3C2 (CNT@Ti3C2-300) film was obtained via facile filtration of the MXene and CNT suspension mixture followed by annealing. The CNT could effectively pillar the interlayer space of the nanosheets to avoid the layeraggregation and create a cross-linked conductive network in the film. The hybrid film exhibits high capacitance of 366.7 F g-1 at a current density 1 A g-1, excellent rate performance up to 75.1% at 20 A g-1 and long cycling life (98.7 % capacitance retention after 8000 cycles at 20 A g-1). The above results indicate its huge potential application as flexible supercapacitors electrode. © 2022 SPIE.

关键词： Carbon nanotubes

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White matter regeneration induced by aligned fibrin nanofiber hydrogel contributes to motor functional recovery in canine T12 spinal cord injury

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Regenerative Biomaterials 2022年第1期9卷 260-270页

作者： Zheng Cao Weitao Man Yuhui Xiong Yi Guo Shuhui Yang Dongkang Liu He Zhao Yongdong Yang Shenglian Yao Chuzhong Li Lingyun Zhao Xiaodan Sun Hua Guo Guihuai Wang Xiumei Wang State Key Laboratory of New Ceramics and Fine Processing Key Laboratory of Advanced MaterialsSchool of Materials Science and EngineeringTsinghua UniversityBeijing 100084China Department of Neurosurgery Beijing Tsinghua Changgung HospitalSchool of Clinical MedicineTsinghua UniversityBeijing 102218China Center for Biomedical Imaging Research Tsinghua UniversityBeijing 100084China Department of Orthopedics Dongzhimen HospitalBeijing 100007China School of Materials Science and Engineering University of Science and Technology BeijingBeijing 100083China Beijing Neurosurgical Institute Beijing Tiantan HospitalBeijing 100070China

A hierarchically aligned fibrin hydrogel(AFG)that possesses soft stiffness and aligned nanofiber structure has been successfully proven to facilitate neuroregeneration in vitro and in ***,its potential in promoting nerve regeneration in large animal models that is critical for clinical translation has not been sufficiently ***,the effects of AFG on directing neuroregeneration in canine hemisected T12 spinal cord injuries were *** obvious white matter regeneration consisting of a large area of consecutive,compact and aligned nerve fibers is induced by AFG,leading to a significant motor functional *** canines with AFG implantation start to stand well with their defective legs from 3 to 4 weeks postoperatively and even effortlessly climb the steps from 7 to 8 ***,high-resolution multi-shot diffusion tensor imaging illustrates the spatiotemporal dynamics of nerve regeneration rapidly crossing the lesion within 4 weeks in the AFG *** findings indicate that AFG could be a potential therapeutic vehicle for spinal cord injury by inducing rapid white matter regeneration and restoring locomotion,pointing out its promising prospect in clinic practice.

关键词： aligned fibrin hydrogel spinal cord injury white matter regeneration diffusion tensor imaging canine

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