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SSRN 2024年

作者： Jiang, Siwei Cheng, Jiaxu Nayaka, G.P. Dong, Peng Zhang, Yingjie Zhou, Zhongren Xing, Yubo Zhang, Xiaolei Du, Ning Faculty of Metallurgical and Energy Engineering Kunming University of Science and Technology Kunming650093 China National and Local Joint Engineering Laboratory for Lithium-ion Batteries and Materials Preparation Technology Key Laboratory of Advanced Battery Materials of Yunnan Province Kunming University of Science and Technology Kunming650093 China Physical & Materials Chemistry Division CSIR-National Chemical Laboratory Pune India Carbon ONE New Energy Group Co. Ltd. State Key Lab of Silicon Materials Zhejiang University Hangzhou310027 China

Nanoscaling and alloying techniques for silicon-based materials are widely recognized as vital technological approaches to effectively address the challenges associated with volume expansion and poor conductivity in silicon anodes. Developing short process, cost-effective preparation methods and shape controllable silicon-based materials is expected to improve their cyclability. Herein, benefiting from the high electrical conductivity of metallic copper and its stable alloy phase with silicon, the present study introduced a simple synthetic process by incorporating nanoscale Cu2O into a SiO2 dioxide matrix under a combination of hydrothermal reaction with Cu(NO3)2 as the copper source and further sintering treatment. Under the conditions of a Cu:Si molar ratio to 3:8 under 850°C by 2.6 V of constant electrolsyis for 3 h, straight silicon nanowires with a cross-sectional distribution were obtained. The Cu3Si alloy particles were enriched around silicon nanowires. The electrochemical lithium storage performance of the Cu3Si/Si nanowires was tested, yielding an initial specific capacity of 2530.7 mAh/g and an initial coulombic efficiency of 88.94%. After 100 charge-discharge cycles, the discharge specific capacity reached 1675.4 mAh/g, with a capacity retention rate of 66.20%. The unique Cu3Si/Si architecture provides an ideal model that can be used to design Si-based composite anode for advanced LIBs. © 2024, The Authors. All rights reserved.

关键词： Anodes

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Melamine-assisted pyrolytic synthesis of bifunctional cobalt-based core–shell electrocatalysts for rechargeable zinc–air batteries

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Journal of Energy Chemistry 2021年第2期30卷 364-371,I0013页

作者： Jiqing Jiao Yuan Pan Bin Wang Wenjuan Yang Shoujie Liu Chao Zhang Institute for New Energy Materials and Low Carbon Technologies School of Material Science and EngineeringTianjin University of TechnologyTianjin 300384China College of Materials Science and Engineering Qingdao UniversityQingdao 26607JShandongChina State Key Laboratory of Heavy Oil Processing China University of Petroleum(East China)Qingdao 266580ShandongChina Key Laboratory of Applied Surface and Colloid Chemistry Ministry of EducationSchool of Chemistry and Chemical EngineeringShaanxi Normal UniversityXi'an 710119ShaanxiChina International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology of Ministry of Education Institute of Microscale OptoelectronicsShenzhen UniversityShenzhen 518060GuangdongChina College of Chemistry and Materials Science Anhui Normal UniversityWuhu 241000AnhuiChina

Designing a highly active-and stable non-noble metal bifunctional oxygen catalyst for rechargeable Znair battery remains a great challenge. Herein, we develop a facile and melamine-assisted-pyrolysis(MAP)strategy for the synthesis of core–shell Co-based electrocatalysts@N-doped carbon nanotubes(Co@CNTs)derived from metal–organic frameworks. The Co@CNTs exhibited excellent bifunctional electrocatalytic performance for both oxygen evolution and reduction. DFT calculations demonstrated that the Gibbs free energy of the rate-determining step was small enough to improve ORR activities. As a result, a Zn-air battery assembled with Co@CNTs proves a lager power density, low voltage gap between charge–discharge and excellent stability. Thus, this work offers a facile strategy to realize the synthesis of non-noble metal electrocatalyst for Zn-air battery materials with high electrochemical performance.

关键词： Oxygen evolution reaction Oxygen reduction reaction Controllable synthesis Co@Carbon nanotubes Zn-air battery

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An Experimental and Numerical Study on the Evolution of Pores and its Effect on the Tensile Properties of LPBF Invar36 with Different Energy Density

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SSRN 2024年

作者： Yang, Zheyu Chen, Yue Wang, Shubang Bian, Gongbo Lan, Liwei Wang, Wenxian Zhao, Zhenan Zhang, Hongwei Li, Changchun Wang, Xiangbing College of Materials Science and Engineering Taiyuan University of Technology Taiyuan030024 China Key Laboratory of Interface Science and Engineering in Advanced Materials Taiyuan University of Technology Ministry of Education Taiyuan030024 China Shanxi-Zhejiang University New Materials and Chemical Research Institute Taiyuan030032 China State Key Laboratory of Fluid Power and Mechatronic Systems Key Laboratory of Soft Machines and Smart Devices of Zhejiang Province Department of Engineering Mechanics Zhejiang University Hangzhou310027 China Key Laboratory of Superlight Material and Surface Technology Ministy of Education College of Materials Science and Chemical Engineering Harbin Engineering University Harbin150001 China

Laser powder bed fusion (LPBF) Invar 36 alloy has attracted plenty of attention in cryogenic components or precision instruments due to its low coefficient of thermal expansion in a wide range of temperature. However, the LPBF Invar 36 has a significant anisotropic mechanical property due to the unique columnar grain morphology and pore feature. In this study, the influence of scanning speed on the anisotropic tensile properties were investigated. In this respect, tensile tests of specimens parallel and perpendicular to the building direction with a scanning speed from 200 to 1400 mm/s of LPBF Invar 36 alloy were conducted, and the microstructural influential factors on the anisotropic tensile properties were analyzed. Results show that as the volumetric energy density (VED) increases, the inhomogeneity of grain morphology decreases, while the pore feature changes from the lack-of-fusion (LOF) pore perpendicular to the building direction to the bubble-shaped spherical pore, which is resulted from the collapse of the locking holes. In this case, the grain orientation and size, as well as the dislocation density in the vicinity of pores are influenced by the pore morphology due to different thermal history. On the whole, the increased level of anisotropy in pores are the main reason of the increased level of anisotropy in tensile properties. © 2024, The Authors. All rights reserved.

关键词： Anisotropy

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Efficient Electrochemical Synthesis of Cu 3 Si/Si Hybrids Asnegative Electrode Material for Lithium-Ion Battery

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SSRN 2024年

作者： Jiang, Siwei Cheng, Jiaxu Nayaka, G.P. Dong, Peng Zhang, Yingjie Zhou, Zhongren Xing, Yubo Zhang, Xiaolei Du, Ning Faculty of Metallurgical and Energy Engineering Kunming University of Science and Technology Kunming650093 China National and Local Joint Engineering Laboratory for Lithium-ion Batteries and Materials Preparation Technology Key Laboratory of Advanced Battery Materials of Yunnan Province Kunming University of Science and Technology Kunming650093 China Physical & Materials Chemistry Division CSIR National Chemical Laboratory Pune India Carbon ONE New Energy Group Co. Ltd. State Key Lab of Silicon Materials Zhejiang University Hangzhou310027 China

Nanoscaling and alloying techniques for silicon-based materials are widely recognized as vital technological approaches to effectively address the challenges associated with volume expansion and poor conductivity in silicon anodes. Developing short process, cost-effective preparation methods and shape controllable silicon-based materials is expected to improve their cyclability. Herein, utilizing the superior electrical conductivity of copper metal and its stable alloy interaction with silicon, the present study introduced a simple synthetic process by incorporating nanoscale Cu2O into a SiO2 dioxide matrix under a combination of hydrothermal reaction with Cu(NO3)2 as the copper source and further sintering treatment. Under the conditions of a Cu:Si molar ratio to 3:8 under 850 °C by 2.6 V of constant electrolsyis for 3 h, straight silicon nanowires with a cross-sectional distribution were obtained. The Cu3Si alloy particles were enriched around silicon nanowires. Experimental testing was conducted to evaluate the electrochemical storage capabilities of Cu3Si/Si nanowires, resulting in an initial specific capacity of 2530.7 mAh g-1 and an initial coulombic efficiency of 88.94%. After 100 charge-discharge cycles, the discharge specific capacity reached 1675.4 mAh g-1, with a capacity retention rate of 66.20%. The distinctive Cu3Si/Si architecture offers an exemplary model for the design of silicon-based composite anodes for advanced lithium-ion batteries. © 2024, The Authors. All rights reserved.

关键词： Nanowires

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Large-scale blow spinning of heat-resistant nanofibrous air filters

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Nano Research 2020年第3期13卷 861-867页

作者： Ziwei Li Jianan Song Yuanzheng Long Chao Jia Zhenglian Liu Lei Li Cheng Yang Junchen Liu Sen Lin Haiyang Wang Yibo Liu Minghao Fang Hui Wu State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing100084China School of Materials Science and Technology China University of GeosciencesBeijing100083China State Key Laboratory of Information Photonics and Optical Communications and School of Science Beijing University of Posts and TelecommunicationsBeijing100876China

Particulate matter(PM)pollution has become a serious problem worldwide and various kinds of nanofibrous filters aiming to solve the problem have been *** is urgent to remove PM from high-temperature pollution sources,such as industrial emissions,coal furnaces,and automobile exhaust ***,filtration at pollution sources remains challenging because most existing air filters are not resistant to high ***,heat-resistant polyimide(PI)nanofibrous air filters are fabricated via a simple and scalable solution blow-spinning *** air filters show excellent thermal stability at high temperature up to 420℃.They exhibit a filtration efficiency as high as 99.73%at ambient temperature and over 97%at 300℃.In addition,a field test shows that the filters remove>97%of PM from the car exhaust ***,the blow-spun PI nanofibrous membranes combined with the facile preparation strategy have great potential in high temperature air filtration fields and other similar applications such as water purification and protein separation.

关键词： air filters heat-resistant blow spinning nanofibers

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Arc Erosion Resistance of Al2o3-Cu/35mo Composites Reinforced by Trace Graphene Oxide

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SSRN 2024年

作者： Li, Lihua Zhang, Jiacan Zhou, Meng Tian, Baohong Zhang, Yi Jing, Ke Li, Xu Sun, Yonghui Volinsky, Alex A. Guo, Huiwen School of Materials Science and Engineering Henan University of Science and Technology Provincial and Ministerial Co-construction of Collaborative Innovation Center for Non-ferrous Metals New Materials and Advanced Processing Technology Luoyang471023 China Henan Province Key Laboratory of Nonferrous Materials Science and Processing Technology Luoyang471023 China Center for Advanced Measurement Science National Institute of Metrology Beijing100029 China Chinalco Luoyang Copper Processing Co. Ltd. Luoyang471000 China Department of Mechanical Engineering University of South Florida 4202 E. Fowler Ave. ENG 030 Tampa33620 United States

In this study, Al2O3-Cu/35Mo composites were prepared by rapid hot-press sintering-internal oxidation method, and the materials were modified by adding trace amounts of graphene oxide (GO). The results show that the relative densities of the composites are above 99%, the γ-Al2O3 generated by internal oxidation is diffusely distributed on the copper matrix. The addition of GO produced a small amount of hard MoC particles at the interface, which effectively enhance the interfacial bonding force of the composites. In the 30V DC, 10-30A electrical contact test, the anode mass of the composites increases, while the cathode mass decreases. And GO reduces the total mass loss of the electric contact by 63.6%, 38.9%, 51.3% and 20.9%, respectively. A comparison of the electrical contact properties of the two materials showed that the addition of GO dispersed the concentrated erosion of the arc. At 10A and 30A, the arc energy is reduced by 75.5% and 12.5%, respectively. With the gradual increase in electric current, GO makes the Al2O3-Cu/35Mo composites more stable during the electric contact process, improves the anti-welding ability of the contact and reduces contact resistance. © 2024, The Authors. All rights reserved.

关键词： Graphene

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Synthesis and Applications of Bipo4: Eu3+/Sio2/Agbr Phosphor

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SSRN 2023年

作者： Li, Huiya Wang, Xiaomeng Li, Ran Li, Huiting Xie, Jixing Jiao, Yunhong Ma, Haiyun Qu, Hongqiang Xu, Jianzhong Wang, Liyong College of Chemistry and Materials Science State Key Laboratory of New Pharmaceutical Preparations and Excipients The flame retardant and processing technology engineering research center Hebei University No. 180 Wusi Road Baoding071002 China

In this work, BiPO4: Eu3+ composite decorated by SiO2 and AgBr was successfully synthesized by a facile two-step deposition precipitation method. The structure, morphology and composition of obtained samples were characterized by X-ray diffraction (XRD), Scanning electron microscope (SEM), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectrometer (FTIR), diffuse reflectance spectroscopy (DRS), Photoluminescence Spectroscopy (PL) and Electrochemical impedance spectroscopy (EIS) techniques. Furthermore, luminescent and catalytic properties were investigated. The results show that the fluorescence intensities of the samples obviously enhance after SiO2 modification. In addition, the optimized phosphor can be potentially used as a red phosphor in fluorescent films and LEDs. Furthermore, the synthesized BPO: Eu3+/SiO2/AgBr exhibited high performance in the catalytic reduction of 4-nitrophenol (4-NP). Thus, these results provide a concise direction for the design of composites that can be used for the versatile removal of organics and phosphors development. © 2023, The Authors. All rights reserved.

关键词： Bromine compounds

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Synthesis and Application of Bipo4: Eu3+/Sio2/Agbr Phosphor

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SSRN 2023年

关键词： Bromine compounds

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Selective Removal of Acid Sites in Mordenite with the Assistance of Tetrahedral Ethyl Ammonia Bromide for High Performing Dimethyl Ether Carbonylation Reaction

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SSRN 2023年

作者： Wang, Xiaosheng Liu, Yinghui Liu, Yuxiang Wang, Hongjing Li, Ranjia Yu, Changchun Ren, Kun Xu, Chunming State Key Laboratory of Heavy Oil Processing College of New Energy and Materials China University of Petroleum-Beijing Beijing102249 China College of Chemical Engineering Qingdao University of Science & Technology Qingdao266042 China

The distribution of acid sites in Mordenite (MOR) is crucial for its carbonylation performance. In this paper, MOR was subjected to acid treatment to selectively remove those acid sites in 12 member-ring (MR) with the assistance of tetrahedral ethyl ammonia bromide used during synthesis process. The impact of acid treatment on structure, morphology, framework atoms and acidity were systematically studied. The characterization results indicated that the structure of the samples was only slightly impacted while the mesopore volume slightly increased. Due to the excessive removal of acid sites, the sample treated by nitric acid (0.1 mol/L) exhibited lower carbonylation activity whether with or without the protection of templates. However, the acid sites in the 12 MR were selectively removed in the citric acid treatment process by two different ways: the etching effect of H+ and the complexation of citric ions. The protection effect of templates for the acid sites in 8 MR was remarkable. Therefore, selective removal of acid sites in 12 MR was successful realized with template assistance, leading to considerable improvements in activity and stability for DME carbonylation reaction. © 2023, The Authors. All rights reserved.

关键词： Ammonia

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Tuning ferroelectricity of polymer blends for flexible electrical energy storage applications

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Science China materials 2021年第7期64卷 1642-1652页

作者： Xin Zhang Yanda Jiang Ruoqi Gao Xinhui Li Zhonghui Shen Bao-Wen Li Qingfeng Zhang Shujun Zhang Ce-Wen Nan State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Center of Smart Materials and DevicesWuhan University of TechnologyWuhan 430070China International School of Materials Science and Engineering Wuhan University of TechnologyWuhan 430070China Hubei Key Lab of Ferro&Piezoelectric Materials and Devices School of Materials Science&EngineeringHubei UniversityWuhan 430062China Institute for Superconducting and Electronic Materials Australian Institute of Innovative MaterialsUniversity of WollongongNorth WollongongNSW 2500Australia School of Materials Science and Engineering State Key Lab of New Ceramics and Fine ProcessingTsinghua UniversityBeijing 100084China

Ferroelectric polymers are the mainstay of advanced flexible electronic *** to tailor the ferroelectric polymer films for various applications via simple processing approaches is *** we demonstrate the tuning of ferroelectric responses can be achieved in polymer blends of poly(vinylidene fluoride-trifluoroethylene)(P(VDF-TrFE))and polymethyl methacrylate(PMMA)prepared via a simple two-step *** proposed two-step process endows the polymer blends with a random distribution of P(VDF-TrFE)crystalline phase,hence decoupling the coherent ferroelectric domain interactions between continuous ordered crystalline phases that ubiquitously existed in common P(VDF-TrFE)*** incorporation of the miscible non-crystalline PMMA chains with low-polarity results in reversal dipoles and a transition from ferroelectric to antiferroelectric-like behavior,overcoming the trade-off between the polarization and depolarization *** particular,resultant excellent mechanical and electrical properties of the polymer blend films give rise to remarkably improved breakdown strength and energy storage performance,surpassing P(VDF-TrFE)and commercial biaxial-oriented polypropylene *** work provides a simple and effective strategy to tailor the ferroelectric response of polymeric materials with great potential for flexible electrical energy storage applications.

关键词： ferroelectric polymers antiferroelectricity energy density breakdown strength dielectric

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