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Defective ZnS nanoparticles anchored in situ on N-doped carbon as a superior oxygen reduction reaction catalyst

Journal of Energy Chemistry 2019年第12期39卷 152-159页

作者： Hu Libing Wei Zengxi Yu Feng Yuan Huifang Liu Mincong Wang Gang Peng Banghua Dai Bin Ma Jianmin School of Chemistry and Chemical Engineering Shihezi University Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bingtuan Xinjiang Shihezi 832003 School of Physics and Electronics Hunan University Hunan Changsha 410082 Institute of Advanced Electrochemical Energy Xi’an University of Technology Shaanxi Xi'an 710048 Zhengzhou University Key Laboratory of Materials Processing and Mold Ministry of Education Henan Zhengzhou 450002

Defect engineering has been used to develop low-cost and effective catalysts to boost oxygen reduction reactions. However, the development of catalysts that use metal cation vacancies as the active sites for oxygen reduction reaction is lacking. In this study, ZnS nanoparticles on N-doped carbon serve as an oxygen reduction reaction catalyst. These catalysts were prepared via a one-step method at 900 °C. Amazingly, the high-resolution transmission electron microscope image revealed obvious defects in the ZnS nanoparticles. These facilitated the catalyst synthesis, and the product displayed good electrocatalytic performance for the oxygen reduction reaction in an alkaline medium, including a lower onset potential, lower mid-wave potential, four electron transfer process, and better durability compared with 20 wt% Pt/C. More importantly, the density functional theory results indicated that using the Zn vacancies in the prepared catalyst as active sites required a lower reaction energy to produce OOH* from *OO toward oxygen reduction reaction. Therefore, the proposed catalyst with Zn vacancies can be used as a potential electrocatalyst and may be substitutes for Pt-based catalysts in fuel cells, given the novel catalyst’s resulting performance.

关键词： Defective ZnS nanoparticle Zn vacancy Electrocatalyst Oxygen reduction reaction Density functional theory calculations

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Erratum to:Oil-soluble polymer brushes-functionalized nanoMOFs for highly efficient friction and wear reduction

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Friction 2024年第12期12卷 2838-2838页

作者： Jianxi LIU Yong QIAN Dongsheng LI Wei WU Mengchen ZHANG Jie YAN Bin LI Feng ZHOU State Key Laboratory of Solidification Processing Center of Advanced Lubrication and Seal MaterialsSchool of Materials Science and EngineeringNorthwestern Polytechnical UniversityXi'an 710072China Shaanxi Engineering Research Center of Special Sealing Technology Xi'an Aerospace Propulsion InstituteXi'an 710100China State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000China

Erratum to Liu,J.,Qian,Y.,Li,*** ***-soluble polymer brushes-functionalized nanoMOFs for highly efficient friction and wear *** 12(7):1499-1511(2024).https://***/10.1007/s40544-023-0823-x The authors regret that there was a misspelling of the author Dongsheng Li’s name on the webpage of this article,and the author information on the webpage of this article should be corrected as.

关键词： friction wear Friction

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Stability of DE-GMAW process by nine-point control based on real-time target machine

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Cailiao Kexue yu Gongyi/Material Science and technology 2009年第SUPPL. 2期17卷 213-215页

作者： Huang, Jian-Kang Shi, Yu Zhang, Yu-Ming Lu, Li-Hui Li, Yan Fan, Ding State Key Laboratory of Gansu Advanced Non-ferrous Metal Materials Lanzhou University of Technology Lanzhou 730050 China Center for Manufacturing University of Kentucky Lexington KY 40506 United States Key Laboratory of Non-ferrous Metal Alloys and Processing of Ministry of Education Lanzhou University of Technology Lanzhou 730050 China

DE-GMAW(Double-Electrode Gas Metal Arc Welding) is a novel and high effective welding method. According to the problems, such as the instability of welding process and the big welding spatter in welding process, a rapid prototyping control system about xpc real-time target machine was designed to control the welding process with nine-point control method. The result shows that, the stable welding process can be acquired by the control system designed in DE-GMAW process, and good weld forming and lower spatter can also be ensured.

关键词： Gas metal arc welding

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Fluxible Monodisperse Quantum Dots with Efficient Luminescence†

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Angewandte Chemie 2010年第51期122卷

作者： Qisong Feng Lijie Dong Jing Huang Qi Li Yanhong Fan Jun Xiong Chuanxi Xiong State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 (P.R. China) Fax: (+86) 27‐8765‐2879 School of Materials Science and Engineering Wuhan University of Technology Wuhan 430070 (P.R. China)

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MRI-guided robot intervention—current state-of-the-art and new challenges

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Med-X 2023年第1期1卷 1-41页

作者： Huang, Shaoping Lou, Chuqian Zhou, Ying He, Zhao Jin, Xuejun Feng, Yuan Gao, Anzhu Yang, Guang-Zhong Institute of Medical Robotics and School of Biomedical Engineering Shanghai Jiao Tong University Shanghai China National Engineering Research Center of Advanced Magnetic Resonance Technologies for Diagnosis and Therapy (NERC-AMRT) Shanghai Jiao Tong University Shanghai China Materials and Technology Center of Robotics Empa Dübendorf Switzerland State Key Lab of Metal Matrix Composites and School of Materials Science and Engineering Shanghai Jiao Tong University Shanghai China Institute of Medical Robotics and Department of Automation Shanghai Jiao Tong University Shanghai China The Key Laboratory of System Control and Information Processing Ministry of Education Shanghai China

Magnetic Resonance Imaging (MRI) is now a widely used modality for providing multimodal, high-quality soft tissue contrast images with good spatiotemporal resolution but without subjecting patients to ionizing radiation. In addition to its diagnostic potential, its future theranostic value lies in its ability to provide MRI-guided robot intervention with combined structural and functional mapping, as well as integrated instrument localization, target recognition, and in situ, in vivo monitoring of the therapeutic efficacy. Areas of current applications include neurosurgery, breast biopsy, cardiovascular intervention, prostate biopsy and radiotherapy. Emerging applications in targeted drug delivery and MRI-guided chemoembolization are also being pursued. Whilst promising progress has been made in recent years, there are still significant basic science research and engineering challenges. This paper provides a comprehensive review of the current state-of-the-art in MRI-guided robot intervention and allied technologies in actuation, sensing, new materials, interventional instruments, and interactive/real-time MRI. Potential future research directions and new clinical developments are also discussed.

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Effect of different coatings on the weldability of Al to steel

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Journal of Physics: Conference Series 2018年第1期1063卷

作者： Junhao Sun Zhuguo Li Jian Huang Rui Cao Shanghai key Laboratory of Materials Laser Processing and Modification Shanghai Jiao Tong University Shanghai China State Key Laboratory of Advanced Processing and Recycling of Non-Ferrous Metals Lanzhou University of Technology Lanzhou China

The influence of different coatings on the weldability of Al/steel was assessed in this study. Different kinds of the coatings, which included pure zinc coating, Fe-Zn coating and without coating, were considered. The thickness of the coating was also studied. Different configuration of overlap and butt joint was used, and different welding methods including cold metal transfer (CMT) welding-brazing and laser welding-brazing with filler metal were investigated. Samples were fabricated and the weld appearance, microstructure and composition analyses of the joints were examined. It was found that the Al to steel without coating could not be welded due to the formation of large amount of brittle Fe-Al intermetallic compounds (IMC). The coating helped suppress the formation of IMC and a welding-brazing joint was produced. However, pure Zn coating enhanced the wetting of molten filler onto the solid steel substrate, but Fe-Zn coating barely enhanced the molten filler to wet the steel substrate. The coating with a thickness of 10-20 μm contributed to a better performance of Al/steel joint.

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Numerical simulation of two-track laser hardening process of 42CrMo steel

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Heat Treatment and Surface Engineering 2022年第1期4卷 20-34页

作者： Daming, Tong Ziyang, Zhang Zhuguo, Li Jianfeng, Gu Sijia, Li Qunli, Zhang Chuanwei, Li Junyu, Zhao Zhaonan, Hu Institute of Materials Modification and Modelling School of Materials Science and Engineering Shanghai Jiao Tong University Shanghai China Shanghai Key Laboratory of Materials Laser Processing and Modification Shanghai Jiao Tong University Shanghai China Openlaser Labs Huzhou RayOpen Research Institute Huzhou China Institute of Laser Advanced Manufacturing Zhejiang University of Technology Hangzhou China Chongqing Gearbox Co. LTD Chongqing China

In this study, a thermal–phase–mechanical coupled numerical model was presented for the prediction of the distribution of temperature, phase and residual stress of 42CrMo steel during two-track laser hardening process. Austenite and tempering transformation were simulated based on the isoconversional method. K-M equation was used to calculate the fraction of martensite. Residual stress was calculated considering the thermal strain, transformation strain and transformation plasticity. The accuracy of the numerical model was verified according to the comparison with experimental results. The stress distribution of two-track laser hardening process was studied according to numerical simulation results. And the effect of the second track on the residual stress produced by the first track in two-track laser hardening was also analyzed by using this numerical model. © 2022 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group.

关键词： Laser hardening numerical simulation overlapping residual stress

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Tightly-bound and room-temperature-stable excitons in van der Waals degenerate-semiconductor Bi4O4SeCl2 with high charge-carrier density

arXiv

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arXiv 2023年

作者： Xu, Yueshan Wang, Junjie Su, Bo Deng, Jun Peng, Cao Wu, Chunlong Zhang, Qinghua Gu, Lin Luo, Jianlin Xu, Nan Guo, Jian-Gang Chen, Zhi-Guo Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing100190 China School of Physical Sciences University of Chinese Academy of Sciences Beijing100190 China Institute for Advanced Studies Wuhan University Hubei Wuhan430072 China State Key of Laboratory of New Ceramics and Fine Processing School of Materials Science and Engineering Tsinghua University Beijing100084 China Songshan Lake Materials Laboratory Guangdong Dongguan523808 China Wuhan Institute of Quantum Technology Hubei Wuhan430206 China

Excitons, which represent a type of quasi-particles consisting of electron-hole pairs bound by the mutual Coulomb interaction, were often observed in lowly-doped semiconductors or insulators. However, realizing excitons in the semiconductors or insulators with high charge carrier densities is a challenging task. Here, we perform infrared spectroscopy, electrical transport, ab initio calculation, and angle-resolved-photoemission spectroscopy studies of a van der Waals degenerate-semiconductor Bi4O4SeCl2. A peak-like feature (i.e., α peak) is present around ~ 125 meV in the optical conductivity spectra at low temperature T = 8 K and room temperature. After being excluded from the optical excitations of free carriers, interband transitions, localized states and polarons, the α peak is assigned as the exciton absorption. Moreover, assuming the existence of weakly-bound excitons—Wannier-type excitons in this material violates the Lyddane-Sachs-Teller relation. Besides, the exciton binding energy of ~ 375 meV, which is about an order of magnitude larger than those of conventional semiconductors, and the charge-carrier concentration of ~ 1.25 ×1019 cm−3, which is higher than the Mott density, further indicate that the excitons in this highly-doped system should be tightly bound. Our results pave the way for developing the optoelectronic devices based on the tightly-bound and room-temperature-stable excitons in highly-doped van der Waals degenerate semiconductors. © 2023, CC BY.

关键词： Bismuth compounds

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Ppr/Epdm/Poe-G-Ma/Ommt Nanocomposites with Superior Low-Temperature Toughness Based on Embedded Ommt within Compound Rubber Dispersion Phase

SSRN

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SSRN 2024年

作者： Shangguan, Yonggang Qiu, Biwei Li, Zhi Chen, Feng Shi, Jiangao Zhang, Mingyu Zheng, Qiang School of Materials and Chemistry University of Shanghai for Science and Technology Shanghai200093 China MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and Engineering Zhejiang University Hangzhou310027 China East China Sea Fisheries Research Institute Chinese Academy of Fishery Sciences Shanghai200090 China School of Chemistry and Chemical Engineering Northwestern Polytechnical University Xi’an710129 China College of Materials Science & Engineering Taiyuan University of Technology Taiyuan030024 China Shanxi-Zheda Institute of Advanced Materials and Chemical Engineering Taiyuan030024 China

A new approach to produce polypropylene random copolymer/ethylene propylene diene monomer/polyolefin elastomers modified with maleic anhydride/organic modified nanomontmorillonite (PPR/EPDM/POE-g-MA/OMMT) nanocomposites with superior low-temperature toughness was conducted. The brittle-ductile transition temperature (Tbd) of PPR/EPDM/POE-g-MA/OMMT nanocomposites reduced from -20 °C to -40 °C. The incorporation of POE-g-MA results in the distribution of OMMT changing from the interfacial distribution into dispersed inside rubber phase and a compound rubber dispersed phase in PPR/EPDM/POE-g-MA/OMMT nanocomposites was comprised of EPDM, POE-g-MA and embedded OMMT. The synergistic effect of POE-g-MA and OMMT was considered to result from the special compound rubber dispersed phase consisting of EPDM and POE-g-MA as well embedded OMMT, which led to the reduction in space between rubber domains and the increase in internal friction and ultimately brought about the remarkable enhancement in mechanical properties. © 2024, The Authors. All rights reserved.

关键词： Rubber

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Dimensional control of octahedral tilt in SrRuO3 via infinite-layered oxides

arXiv

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arXiv 2021年

作者： Lin, Shan Zhang, Qinghua Sang, Xiahan Zhao, Jiali Cheng, Sheng Huon, Amanda Jin, Qiao Chen, Shuang Chen, Shengru Guo, Haizhong He, Meng Ge, Chen Wang, Can Wang, Jia-Ou Fitzsimmons, Michael R. Gu, Lin Zhu, Tao Jin, Kui-Juan Guo, Er-Jia Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing100190 China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing100049 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Nanostructure Research Center Wuhan University of Technology 122 Luoshi Rd. Wuhan430070 China Institute of High Energy Physics Chinese Academy of Sciences Beijing100049 China Spallation Neutron Source Science Center Dongguan523803 China School of Physical Sciences University of Chinese Academy of Sciences Beijing100190 China Neutron Scattering Division Oak Ridge National Laboratory Oak RidgeTN37831 United States School of Physical Engineering Zhengzhou University Zhengzhou450001 China Songshan Lake Materials Laboratory DongguanGuangdong523808 China

Manipulation of octahedral distortion at atomic length scale is an effective means to tune the physical ground states of functional oxides. Previous work demonstrates that epitaxial strain and film thickness are variable parameters to modify the octahedral rotation and tilt. However, selective control of bonding geometry by structural propagation from adjacent layers is rarely studied. Here we propose a new route to tune the ferromagnetic response in SrRuO3 (SRO) ultrathin layers by oxygen coordination of adjacent SrCuO2 (SCO) layers. The infinite-layered CuO2 in SCO exhibits a structural transformation from "planar-type" to "chain-type" as reducing film thickness. These two orientations dramatically modify the polyhedral connectivity at the interface, thus altering the octahedral distortion of SRO. The local structural variation changes the spin state of Ru and hybridization strength between Ru 4d and O 2p orbitals, leading to a significant change in the magnetoresistance and anomalous Hall resistivity of SRO layers. These findings could launch further investigations into adaptive control of magnetoelectric properties in quantum oxide heterostructures using oxygen coordination. © 2021, CC BY.

关键词： Ruthenium compounds

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