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SSRN 2023年

作者： Cheng, Zhikang Tu, Bingtian Wu, Ye Huang, Haijun School of Science Wuhan University of Technology Hubei Wuhan430070 China Hubei Longzhong Laboratory Wuhan University of Technology Xiangyang Demonstration Zone Hubei Xiangyang441000 China State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Hubei Wuhan430070 China

Phosphorus-based materials with a high theoretical specific capacity and a fast charge-discharge rate are considered as promising anode materials for high energy density lithium-ion batteries (LIBs). Red phosphorus (RP) and black phosphorus (BP) are two main allotropes to be used as anode materials. However, huge volume expansion during charge-discharge processes hinders the application of RP and BP in LIBs. Composites of phosphorus and carbon-based materials have been extensively fabricated to withstand volume expansion of phosphorus and improve cycle performance. Here, composites of BP and graphite (BP-G) with three P-G mass ratios (8 : 2, 7 : 3, and 6 : 4) have been synthesized by a facile and scalab.e high-pressure and high-temperature (HPHT) method using RP and graphite composites (RP-G) prepared by ball milling as precursors. Their microstructure and bonding configurations have been analyzed by various characterization techniques. Among three RP-G composites, 7RP-3G exhibits the most excellent cycling stability, a high reversible capacity of 1331 mAh/g after 200 cycles at a current density of 0.78 A/g. However, RP-G composites show poor stability at high current densities. Among three BP-G composites, 6BP-4G shows the best cycle stability at high current densities, a reversible capacity of 634.6 mAh/g after 500 cycles at a current density of 2.6 A/g. Although, the reversible specific capacities of BP-G composites after long cycles are lower than those of RP-G, BP-G composites show more stable cycle performance than RP-G, especially at high current densities. The present work illustrates a direct and facile method to synthesize BP-G composites, and sheds light to explore new synthetic route of BP-based composites. © 2023, The Authors. All rights reserved.

关键词： Lithium-ion batteries

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Strengthening Soft 45# Steel Through a Crn/W-Dlc/Dlc Multilayer Coating

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SSRN 2024年

作者： Luo, Guoqiang Xu, Xinyu Dong, Haoran Wei, Qinqin Tian, Feng Qin, Jianglin Shen, Qiang Chaozhou Branch of Chemistry and Chemical Engineering Guangdong Laboratory Guangdong Chaozhou521000 China State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Hubei Wuhan430070 China School of Materials Science and Engineering Wuhan University of Technology Hubei Wuhan430070 China Hubei Technology Innovation Center for Advanced Composites Wuhan University of Technology Hubei Wuhan430070 China State Owned Wuhan Xinyu Machine Factory Hubei Wuhan430060 China

Special equipment vehicles typically operate in complex environments, resulting in wear and failure of the chassis’s rotary seal shaft predominantly made of soft 45# steel. An effective strategy to extend the service life is to apply a hard coating on the working surface. However, previous research have primarily concentrated on the coating for hard high-speed steel, while the significant difference of physical characteristics between soft 45# steel and hard coating leads to a weak interface adhesion. This study produces a CrN/W-DLC/DLC multilayer coating on the soft 45# steel with strong interfacial adhesion and superior friction and wear property by tailoring the CrN transition layer thickness. The multilayer coating consists of five layers, a CrN transition layer, a Cr layer, a Cr/WC alternating layer, a W-DLC/DLC alternating layer, and the topmost DLC layer. Increasing the thickness of the transition layer improves the coating's hardness and adhesive strength. The 3CrN/W-DLC/DLC multilayer coating achieves the highest adhesive strength of 75N. The optimized CrN/W-DLC/DLC coating reduces the internal stress of the DLC coating and enhances its adhesion. Importantly, the average friction coefficient and wear cross-sectional area of the CrN/W-DLC/DLC multilayer coatings decrease accordingly. The 3CrN/W-DLC/DLC coating exhibits superior outstanding wear resistance evidenced by an average friction coefficient of 0.119 and a wear cross-sectional area of 100.55 μm2. A High proportion of sp2 bonds in the coating that are susceptible to graphitization and thicker transition layer that enhances the coating's support results in narrower wear traces. The oxidation wear and three-body abrasive wear as the main wear mechanisms. The work provides a significant promise for application in vehicle rotary seal components and a theoretical reference for improving the wear resistance of the seal surface. © 2024, The Authors. All rights reserved.

关键词： Hard coatings

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Amino-Functionalized and Na+ Pre-Intercalated Three Dimensional Ti3c2tx Film Aerogel with Excellent Electrochemical Performances for Supercapacitor

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SSRN 2024年

作者： Guo, Xiaohui Jin, Xinhui Mo, Dejie Feng, Lirong Wang, Dong Su, Baolian Key Lab of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education The College of Chemistry and Materials Science Northwest University Xi’an710069 China Department of inorganic chemistry University of Namur 61 rue de Bruxelles NamurB-5000 Belgium Xinjiang University China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing China

Precise modulation of the pore structure and modification of the surface groups (-NH2) of MXene aerogels by the solid foaming method in combination with Na+ pre-intercalation can significantly increase the layer spacing and change the electronic structure of MXene, thereby significantly optimizing its electrochemical performance. The three dimensional (3D) network structure provides numerous active sites on the surface of MXene and provides more ion transfer pathways, and the large layer spacing allows electrolyte ions fast transport, and the surface groups provide more active sites for the pseudocapacitive reaction. As a result, the prepared Na-Ti3C2Tx film aerogel delivers a high mass specific capacity of 560 F g-1 and excellent cycling performance of 94.5% capacity retention after 12,000 cycles in 0.5 M H2SO4. In addition, the flexible all-solid-state supercapacitor (ASC) composed of MXene film electrodes has excellent specific capacitance ~ 277 F g-1 and high energy density ~ 52.8 Wh kg-1 at 1600 W kg-1. Therefore, this work not only proposes a feasible synthetic method that can precisely regulate the pore structure and surface features of film aerogels, but also demonstrates the broad application prospects of aerogel materials in wearable power devices. © 2024, The Authors. All rights reserved.

关键词： Supercapacitor

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Ag-Pd Bimetallic Hollow Nanostructures with Tunable Compositions and Structures for the Reduction of 4-Nitrophenol

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SSRN 2022年

作者： Ma, Wenjuan Zhang, Guimin Fu, Zhengyi School of Chemistry Chemical Engineering and Life Science Wuhan University of Technology Wuhan430070 China State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China

Bimetallic hollow nanostructures are of interest for high-performance nanocatalysis and utilization efficiency of noble metals. The paper reported a synthesis of Ag-Pd bimetallic hollow nano-hexagon with outer sizes of about 27 nm and wall thicknesses of 3 to 5 nm by galvanic replacement reaction coupling with co-reduction method using Ag nanospheres as sacrificial templates. Cetyltrimethylammonium bromide (CTAB) had double effect on controlling morphologies. It served as the capping agent to mediate the rate of dissolution and deposition on different planes by selectively absorption, meanwhile it provided Br - ion to involve in the reaction and promote the thermodynamics of the galvanic replacement. The compositions and structures of Ag-Pd bimetals could be finely tuned by changing the amount of palladium chloride acid (H 2 PdCl 4 ) while maintaining the volume of Ag seed templates. By comparison of the rate constant k m of 4-nitrophenol reduction reaction over different samples as catalyst, hollow bimetallic nano-hexagon with composition of AgPd 0.76 exhibited the highest catalytic activity because of high surface areas and synergy effect between two metal. © 2022, The Authors. All rights reserved.

关键词： Chlorine compounds

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Phase-junction Ag/TiO_(2)nanocomposite as photocathode for H_(2)generation

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Journal of materials Science & technology 2021年第24期83卷 179-187页

作者： Hemdan S.H.Mohamed Mohamed Rabia Xian-Gang Zhou Xu-Sen Qin Gomaa Khabiri Mohamed Shaban Hussein A.Younus S.Taha Zhi-Yi Hu Jing Liu Yu Li Bao-Lian Su State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan430070China Physics Department Faculty of ScienceFayoum UniversityFayoum63514Egypt Nanophotonics and Applications Lab Physics DepartmentFaculty of ScienceBeni-Suef UniversityBeni-Suef62514Egypt Chemistry Department Faculty of ScienceFayoum UniversityFayoum63514Egypt Nanostructure Research Centre(NRC) Wuhan University of TechnologyWuhan430070China Laboratory of Inorganic Materials Chemistry(CMI) University of Namur61 rue de Bruxelles5000NamurBelgium

Developing anatase/rutile phase-junction in Ti O_(2)to construct Z-scheme system is quite effective to improve its photoelectrochemical *** this work,the anatase/rutile phase-junction Ag/Ti O_(2)nanocomposites are developed as photocathodes for hydrogen *** optimized Ag/Ti O_(2)nanocomposite achieves a high current density of 1.28 m A cm-2,an incident photon-to-current conversion efficiency(IPCE)of 10.8%,an applied bias photon-to-current efficiency(ABPE)of 0.32 at 390 nm and a charge carriers’lifetime up to 2000 *** enhancement on photoelectrochemical activity can be attributed to:(ⅰ)the generated Z-scheme system in the anatase/rutile phase-junction Ag/Ti O_(2)photocathode enhances the separation,diffusion and transformation of electron/hole pairs inside the structure,(ⅱ)Ag nanodots modification in the anatase/rutile phases leading to the tuned band gap with enhanced light absorption and(ⅲ)the formed Schottky barrier after Ag nanodots surface modification provides enough electron traps to avoid the recombination of photogenerated electrons and *** results here suggest that developing phase-junction nanocomposite as photocathode will provide a new vision for their enhanced photoelectrochemical generation of hydrogen.

关键词： Ag/TiO_(2)nanocomposites Anatase/rutile phase-junction Z-scheme Photocathode H2 generation

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Mechanical and Dielectric Properties of Si3N4/β-SiAlON Composite Ceramics Fabricated by Vat Photopolymerization 3d Printing technology

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SSRN 2024年

作者： Chen, Zihuan Duan, Wenyan Zhao, Chunyang Wang, Xuye Jin, Baojie Hu, Chuanqi Jia, Qingfeng Li, Shan Liu, Bingshan Wang, Gong Zhang, Dongyun Technology and Engineering Centre of Space Utilization Chinese Academy of Sciences Beijing100094 China Institute for Laser Engineering School of Physics and Optoelectronic Engineering Beijing University of Technology Beijing100124 China State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China School of Materials Science and Engineering University of Science and Technology Beijing Beijing100083 China Chinese Academy of Sciences Beijing100094 China

Vat photopolymerization 3D printing provides a novel approach for preparing broadband wave-transparent Si3N4/β-SiAlON composite ceramics. This paper oxidized raw powder to introduce low dielectric phases (SiO2) and overcome the low curing depth of α-Si3N4. The powder to prepare a high solid content (50 vol%) slurry was firstly oxidized for 1h at 1200 °C then modified by 6wt% dispersant. The selected print thickness of 50 μm was the highest known for Si3N4 vat photopolymerization 3D printing, greatly improving printing efficiency. Finally, the mechanical and dielectric properties of Si3N4/β-SiAlON ceramics at different sintering temperatures were systematically investigated. The composite ceramics sintering at 1780 °C had a maximum bending strength of 236±16 MPa, the real permittivity was 4.83, and the tangent loss lower than 0.03. At 1800 °C the porosity increased resulting in bending strength decreased to 109±4 MPa, the real permittivity to 3.23, and the tangent loss decreased to lower than 0.02. © 2024, The Authors. All rights reserved.

关键词： Nitrogen compounds

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synthesis of Tetragonal Batio3 Powder with Size and Dispersity Optimization Via Synergy Mechanisms of Combined Dispersants

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SSRN 2022年

作者： Luo, Guoqiang Zhang, Ganrong Bai, Luo Zhang, Ying Fan, Yuxin Han, Yuzhe Guo, Xiaoping Li, Meijuan Tu, Rong Shen, Qiang State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China School of Chemistry Chemical Engineering and Life Sciences Wuhan University of Technology Hubei Wuhan430070 China

Tetragonal BaTiO3 powder with appropriate size and dispersity is essential for the dielectric layers in multilayer ceramic capacitor technology. In this work, high tetragonality BaTiO3 powder with controllab.e dispersion, and particle size was synthesized using combined dispersants and a two-step hydrothermal method. Owing to the synergistic effect of chemical bond force and electrostatic adsorption force between CTAB and PVP composite dispersants at a high temperature, the ultrafine BaTiO3 powder with a high c/a of 1.0090, small size of 236±15 nm and low polydispersity index of 0.336 was achieved. This idea shows great significance for the synthesis of BaTiO3 powder with high tetragonal, high dispersion, and small particle sizes. © 2022, The Authors. All rights reserved.

关键词： Barium titanate

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In situ synthesis of a porous high-Mn and high-Al steel by a novel two-step pore-forming technique in vacuum sintering

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Journal of materials Science & technology 2020年第4期39卷 82-88页

作者： Chuanbing Zhuang Zhigang Xu Shangyu Huang Yu Xia Chuanbin Wang Qiang Shen Hubei Key Laboratory of Advanced Technology for Automotive Components Wuhan University of TechnologyWuhan 430070China Hubei Collaborative Innovation Center for Automotive Components Technology Wuhan University of TechnologyWuhan 430070China School of Materials Science and Engineering Wuhan University of TechnologyWuhan 430070China State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China Hubei Engineering Research Center for Green Precision Materials Forming Wuhan University of TechnologyWuhan 430070China

In this work, a novel in-situ two-step pore-forming process in vacuum sintering(ITPVS) technique combining low-temperature processing to produce open pores through the interdiffusion among the intrinsic components in the base steel, and subsequent high-temperature processing to further improve the porosities by the sublimation of Mn via previously formed open pores, was proposed to produce a lab.scale porous Fe Mn Al steel. For the first time, a high-Mn and high-Al steel with open and overall porosities of ~59.6 vol.% and ~63.7 vol.%(percent in volume, vol.%) was synthesized by isothermal holding of the quaternary elemental Fe/Mn/Al/C powder mixture at 640℃ for 1 h and the subsequent sintering at 1200℃ for 1 h. Elemental Al partly incorporated into/reacted with α-Fe and α-Mn after sintering at640℃ for 1 h, leading to the overall and open porosities promoting by ~26.6 vol.% and ~25.6 vol.%. After sintering at 1200℃, Fe Mn Al steel with increased porosities mainly comprising of austenite and α-Fe obtained. The compression strength and corresponding strain of the 1200℃-sintered porous specimen without crack on the surface was ~75 MPa and ~25%. The ITPVS technique takes advantage of using the intrinsic components like Al, Mn and Fe in steels to produce porous structure. This is beneficial to avoiding the contamination of the Fe Mn Al steel matrix caused by the employment of the foreign pore-forming agents.

关键词： Porous metal High manganese steel Two-stage sintering Reaction-diffusion Sublimation method

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High-throughput data-driven interface design of high-energy-density polymer nanocomposites

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Journal of Materiomics 2020年第3期6卷 573-581页

作者： Zhong-Hui Shen Yang Shen Xiao-Xing Cheng Han-Xing Liu Long-Qing Chen Ce-Wen Nan State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Center of Smart Materials and DevicesWuhan University of TechnologyWuhan430070China School of Materials Science and Engineering State Key Lab of New Ceramics and Fine ProcessingTsinghua UniversityBeijing100084China Department of Materials Science and Engineering The Pennsylvania State UniversityUniversity ParkPA16802United States

Understanding the interface effect in dielectric nanocomposites is crucial to the enhancement of their *** this work,a data-driven interface design strategy based on high-throughput phase-field simulations is developed to study the interface effect and then optimize the permittivity and breakdown strength of ***,we use two microscopic features that are closely related to the macroscopic dielectric properties,the thickness and permittivity of the interface phases,to evaluate the role of interfaces in experimental configuration,and thus provide quantitative design schemes for the interfacial *** the polyvinyl difluoride(PVDF)-BaTiO_(3) nanocomposite as an example,the calculation results demonstrate that the interfacial polarization could account for up to 83.6% of the increase in the experimentally measured effective permittivity of the *** on the interface optimized strategy,a maximum enhancement of ~156% in the energy density could be achieved by introducing an interface phase with d/r=0.55 and ε_(interface)/ε_(filler)=0:036,compared to the pristine ***,the present work not only provides fundamental understanding of the interface effect in dielectric nanocomposites,but also establishes a powerful data-driven interface design framework for such materials that could also be easily generalized and applied to study interface issues in other functional nanocomposites,such as solid electrolytes and thermoelectrics.

关键词： Interface Polymer nanocomposites Energy storage Data-driven Phase-field simulation

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Enhancing the Long-Term Stability of Photoresponse in Mgzno Based Uv Msm Photodetector Using Pdms Polymer Capping

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SSRN 2023年

作者： Chetia, Shantanu Kaushik Das, Amit K. Ajimsha, Rohini Sreedharan Mahapatra, Abhinav Singh, Rashmi Misra, Pankaj Oxide Nano-Electronics Lab. Laser Materials Processing Division Raja Ramanna Centre for Advanced Technology Indore452 013 India Homi Bhabha National Institute Training School Complex Anushakti Nagar Mumbai400 085 India Laser & Functional Materials Division Raja Ramanna Centre for Advanced Technology Indore452 013 India

The diffusion of ambient oxygen into MgxZn1-xO based photodetectors (PDs) changes the photoresponse characteristics of the devices over time and, thus, is an issue of a critical concern for their practical application. In this report, the effects of ambient exposure on the long term photoresponse properties of ITO/Mg0.22Zn0.88O/ITO PDs have been studied and a method to improve the stability has been introduced using a polydimethylsiloxane (PDMS) capping layer as a protective barrier against oxygen diffusion. The peak responsivity of the PDs without PDMS capping layer increases from 2.2 mA/W to ~ 69.4 mA/W and the dark current increased from ~ 5.4 × 10-10 to 1.1 × 10-9 in 40 days of ambient exposure, while the peak responsivity and the dark current of the device with PDMS capping remains practically unchanged over time. Additionally, the device with PDMS capping layer demonstrated faster photocurrent rise and decay time as compared to the device without PDMS capping. This finding demonstrates the efficacy of the PDMS capping layer in preserving the photoresponse characteristics of MgxZn1-xO based UV PDs, thereby enhancing their long-term stability. This research not only advances our understanding of the stability issues in MgxZn1-xO based PDs but also paves the way for their successful integration into various photodetection applications. © 2023, The Authors. All rights reserved.

关键词： Photodetectors

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