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Strongly Coupled Ag/Sn-SnO_(2)Nanosheets Toward CO_(2)Electroreduction to pure HCOOH Solutions at Ampere‑Level Current

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Nano-Micro Letters 2024年第3期16卷 212-226页

作者： Min Zhang Aihui Cao Yucui Xiang Chaogang Ban Guang Han Junjie Ding Li‑Yong Gan Xiaoyuan Zhou College of Physics and Center of Quantum Materials and Devices Chongqing UniversityChongqing 401331People’s Republic of China State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of MatterChinese Academy of Sciences(CAS)Fuzhou 350002People’s Republic of China College of Materials Science and Engineering Chongqing UniversityChongqing 400044People’s Republic of China Institute of New Energy Storage Materials and Equipment Chongqing 401135People’s Republic of China State Key Laboratory of Coal Mine Disaster Dynamics and Control Chongqing UniversityChongqing 400044People’s Republic of China

Electrocatalytic reduction of CO_(2) converts intermittent renewable electricity into value-added liquid products with an enticing prospect,but its practical application is hampered due to the lack of high-performance ***,we elaborately design and develop strongly coupled nanosheets composed of Ag nanoparticles and Sn-SnO_(2) grains,designated as Ag/Sn-SnO_(2) nanosheets(NSs),which possess optimized electronic structure,high electrical conductivity,and more accessible *** a result,such a catalyst exhibits unprecedented catalytic performance toward CO_(2)-to-formate conversion with near-unity faradaic efficiency(≥90%),ultrahigh partial current density(2,000 mA cm^(−2)),and superior long-term stability(200 mA cm^(−2),200 h),surpassing the reported catalysts of CO_(2) electroreduction to ***,in situ attenuated total reflection-infrared spectra combined with theoretical calculations revealed that electron-enriched Sn sites on Ag/Sn-SnO_(2)NSs not only promote the formation of*OCHO and alleviate the energy barriers of*OCHO to*HCOOH,but also impede the desorption of H*.Notably,the Ag/Sn-SnO_(2)NSs as the cathode in a membrane electrode assembly with porous solid electrolyte layer reactor can continuously produce~0.12 M pure HCOOH solution at 100 mA cm^(−2)over 200 *** work may inspire further development of advanced electrocatalysts and innovative device systems for promoting practical application of producing liquid fuels from CO_(2).

关键词： Electrochemical CO_(2)reduction Coupled Ag/Sn-SnO_(2)nanosheets Electronic structure Porous solid electrolyte pure

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pure Electron Plasma Experiment*

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Science China Mathematics 1993年第11期36卷 1340-1346页

作者：王新新李银安蒋洪英 Institute of Physics Academia Sinica Beijing 100080 PRC

A pure electron plasma apparatus is described. Its basic parameters have been measured and compared with those of theoretical equations. A signal with high frequency has been observed in an injection phase, which may ... 详细信息

关键词： pure eleetron plasma virtual cathode oscillation.

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Evaluation of dynamic development of grain structure during friction stir welding of pure copper using a quasi in situ method

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Journal of Materials Science & Technology 2019年第7期35卷 1412-1421页

作者： X.C.Liu Y.F.Sun T.Nagira K.Ushioda H.Fujii Joining and Welding Research Institute Osaka University11-1 MihogaokaIbarakiOsaka567-0047Japan School of Materials Science and Engineering Northwestern Polytechnical UniversityXi'an710072China School of Materials Science and Engineering Zhengzhou UniversityZhengzhou450001China

By employing a quasi in situ method, we investigated the dynamic evolution of the grain structure con-sidering the material flow, strain, and strain rate in the friction stir welding of pure copper. The tool' stop action' and rapid cooling were employed and a brass foil was used as a marker to show the material flow path. The grain structure along the material flow path was characterised using electron backscatter diffraction. Static recrystallization occurs for the work-hardened base material in the preheating stage in front of the tool In the acceleration flow stage, grains are significantly refined by plastic deforma-tion, discontinuous dynamic recrystallization, annealing twinning during the strain-induced boundary migration and slight continuous dynamic recrystallization. In the deceleration flow stage, due to a strain reversal, the grain first coarsens, and is thereafter refined again. Finally, the hot-deformed material in the shoulder-affected zone is ‘frozen’ directly whereas that in the probe-affected zone undergoes signif-icant annealing;thus, the recrystallized microstructure and 45°-rotated cube texture are obtained in the probe-affected zone.

关键词： Friction stir welding Grain structure Material flow pure copper EBSD

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Friction stir welding of pure magnesium and polypropylene in a lap-joint configuration: Microstructure and mechanical properties

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International Journal of Minerals,Metallurgy and Materials 2019年第6期26卷 766-774页

作者： Amirhossein Moghanian Moslem Paidar Seyyed Salman Seyedafghahi Olatunji Oladimeji Ojo Department of Materials Engineering Imam Khomeini International UniversityQazvin 34149-16818Iran Department of Material Engineering South Tehran BranchIslamic Azad UniversityTehran 14598-53849Iran Department of Engineering Faculty of Materials Science and EngineeringImam Hossein UniversityTehran 15816-18711Iran Department of Industrial and Production Engineering Federal University of Technology AkureAkurePMB 704Nigeria

A hybrid joint with a satisfactory mixture of pure magnesium and polypropylene(PP)was achieved via friction stir joining(FSW)in a lap-joint *** tool rotational and travel speeds used in this work were 500–700 r/min and 50–100 mm/min,*** mechanical properties and microstructural analysis of the resultant hybrid Mg/PP joint were *** results show that the maximum tensile shear strength(22.5 MPa)of the joint was attained at 700 r/min and 75 mm/min due to the optimum percentage fraction of mechanical interlocking(48%)and the presence of magnesium *** interfacial joint center exhibits the maximum microhardness values because of the presence of refined and intertwined Mg fragments and density dislocations in the matrix of the *** joint failed via two different modes:interfacial line and weld zone fractures,respectively.

关键词： welding microstructure pure magnesium polypropylene rotational speed

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International Journal of Minerals,Metallurgy and Materials 2019年第11期26卷 1450-1456页

作者： Ying Yan Guo-qiang Zhang Li-jia Chen Xiao-wu Li Department of Materials Physics and Chemistry School of Materials Science and Engineeringand Key Laboratory for Anisotropy and Texture of MaterialsMinistry of EducationNortheastern UniversityShenyang 110819China School of Materials Science and Engineering Shenyang University of TechnologyShenyang 110870China

To explore the specimen size effect of mechanical behavior of ultrafine-grained(UFG)materials with different structures,UFG Al sheets processed by equal channel angular pressing(ECAP)were selected as target materials and the dependency of tensile behavior on sheet thickness(t)was systematically *** strength and ductility of ECAPed UFG Al sheets were improved synchronously as t increased from 0.2 to 0.7 mm,and then no apparent change occurred when t reached to 0.7 and 1.0 *** corresponding microstructure evolved from dislocation networks in equiaxed grains into the walls and subgrains and finally into the dominated cells in elongated grains or ***,dense shear lines(SLs)and shear bands(SBs)were clearly observed and microvoids and cracks were initiated along SBs with the increase of *** observations indicated that the plastic deformation of UFG Al sheets was jointly controlled by shear banding,dislocation sliding,and grain-boundary ***,the propagation of SBs became difficult as t ***,the obtained results were discussed and compared with those of annealed UFG Al and UFG Cu.

关键词： ultrafine-grained pure Al specimen size effect strength ductility

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Microstructure and Tribological Properties of TiB_2/TiB/TiN_x(x=1,0.3)/Ti Composite Coating Produced on pure Ti by Laser Surface Alloying

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稀有金属材料与工程 2012年第S1期41卷 344-349页

作者： Guo Chun1,2,Chen Jianmin1,Zhou Jiansong1,Zhao Jierong1,2,Wang Lingqian1,2,Yu Youjun1,2,Zhou Huidi 1 1 Lanzhou Institute of Chemical Physics,Chinese Academy of Sciences,Lanzhou 730000,China 2 Graduate University of Chinese Academy of Sciences,Beijing 100039,China Chinese Acad Sci Lanzhou Inst Chem Phys Lanzhou 730000 Peoples R China Chinese Acad Sci Grad Univ Beijing 100039 Peoples R China

TiB2/TiB/TiNx(x=1,0.3)/Ti composite coating was prepared on pure Ti by laser surface alloying by using powders of boron as starting *** composite coating was examined by X-ray diffraction(XRD),high-resolution transmission electron microscopy(HRTEM)and scanning electron microscopy(SEM).The friction and wear properties of the composite coating were examined using a pin-on-disk tester under dry sliding wear *** results showed that the top surface of the composite coating was mainly composed of TiB2,TiB,TiN0.3,TiN and Ti phases,while the interface of the composite coating was composed of TiB and Ti *** composite coating showed sticklike structure near the top surface,and dendrites structure near the *** friction and wear test showed that the composite coating had better wear resistance than pure Ti due to their higher microhardness than that of pure Ti substrate.

关键词： pure Ti laser surface alloying TiB2 composite coating friction and wear property

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Study on pure silica core optical fibers

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Science China(Technological Sciences) 2008年第1期51卷 58-64页

作者： LI Jian ZHENG Kai CHANG DeYuan WEI Huai NING TiGang FU YongJun MAO XiangQiao YAN FengPing JIAN Wei JIAN ShuiSheng Key Laboratory of All Optical Network&Advanced Telecommunication Network of EMC Institute of Lightwave TechnologyBeijing Jiaotong UniversityBeijing 100044China

An optimal refractive index profile of pure silica core optical fiber (PSCF) was de- signed, in combination with the characters of the modified chemical vapor deposi- tion (MCVD) process. Techniques of preform fabrication by a new furnace round heating MCVD process and fiber drawing process were reviewed. Difficulties in doping fluorine in silica, widening the depressed-index cladding and maintaining the index of fiber core were discussed. Methods used to overcome these difficulties were given at the same time. Additionally, the optimal refractive index profiles of PSCF were presented.

关键词： pure silica core optical fiber (PSCF) depressed index cladding modified chemical vapor deposition (MCVD) process

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Corrosion behavior of pure aluminum in FeCl_3 solution

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Transactions of Nonferrous Metals Society of China 2006年第6期7卷 1460-1466页

作者：屈钧娥郭兴蓬王海人黄金营 School of Chemistry and Material Science Hubei University Department of Chemistry Huazhong University of Science and Technology Postdoctoral Station of Technical Institute of Physics and Chemistry Chinese Academy of Sciences

The corrosion behavior of pure aluminum in FeCl3 solution was investigated mainly by in-situ AFM(Atomic Force Microscopy).The results of combined researches of AFM,SEM(Scanning Electron Microscopy)and EDAX(Energy Dispersive Analysis of X-ray)show that in addition to uniform attack,pitting corrosion takes place also on pure aluminum surface in FeCl3 solution at open-circuit potential,and impurity elements Fe and Cu are found enriched in corrosion ***-situ AFM was also used to examine the initiation and development of pitting corrosion of pure aluminum induced by potentiodynamic sweep,and the repassivation of an active pit is *** tip scratching technique was used to produce a physical defect on metal surface,which is traced by in-situ AFM and it is found that the defect is likely to be preferentially attacked and evolve to pitting corrosion.

关键词： pure aluminum pitting corrosion FeCl3 solution AFM uniform attack

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Enhanced Mechanical Properties of pure Zirconium via Friction Stir Processing

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Acta Metallurgica Sinica(English Letters) 2020年第1期33卷 147-153页

作者： Wen Wang Peng Han Jie Yuan Pai Peng Qiang Liu Fei Qiang Ke Qiao Kuai-She Wang School of Metallurgical Engineering Xi’an University of Architecture and TechnologyXi’an 710055China National and Local Joint Engineering Research Center for Functional Materials Processing Xi’an 710055China

Friction stir processing(FSP), as a new kind of severe plastic deformation technique, can refine and homogenize the microstructure of metallic material. In this study, the effect of FSP on the microstructure and mechanical properties of pure Zr was investigated using electron backscatter diffraction analysis, microhardness and room-temperature tensile testing. The fine-grained(FG) structure with an average grain size of ~ 5.3 μm was obtained in the processed zone, where the average microhardness was ~ 198 HV, 1.6 times higher than that of base metal. Furthermore, tensile property of FG pure Zr exhibited obvious anisotropy owing to strong texture. Both grain size and texture had a significant effect on strength and ductility of FG pure Zr. High yield strength(248 MPa) and ultimate tensile strength(483 MPa), as well as good uniform elongation(10%) were achieved, which demonstrated that FSP was an effective method to fabricate bulk FG pure Zr with high strength and good ductility.

关键词： Friction stir processing pure zirconium Grain size Texture Mechanical property

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Tribological Characterization of Commercial pure Titanium Processed by Multi-Directional Forging

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Acta Metallurgica Sinica(English Letters) 2019年第7期32卷 857-868页

作者： I. Ansarian M. H. Shaeri M. Ebrahimi P. Minarik Department of Materials Science and Engineering Imam Khomeini International University (IKIU) P.O. Box 34148-9681 & Qazvin Iran Department of Mechanical Engineering Faculty of Engineering University of Maragheh P.O. Box 55136-533 Maragheh Iran Department of Physics of Materials Faculty of Mathematics and Physics Charles University Prague Czech Republic

This work discusses tribological properties of commercial pure (CP) titanium processed by multi-directional forging (MDF) up to six passes at room temperature and 220 ℃. For this purpose, wear test was conducted by dry sliding pin-on-disk method on the initial and ultrafine grained samples using different stress magnitudes of 1, 1.5 and 2 MPa. The results showed that wear resistance of CP titanium increases after the first pass of MDF in comparison with the initial condition, irrespective of the applied normal stress. For example, the average wear rate of MDFed samples was decreased about 30% and 24%, after first pass at room temperature and 220 ℃, respectively. However, average wear rate of the samples processed by six MDF passes was reduced about 40% at lower normal loads;it was increased about 9% at higher ones as compared to the initial condition. It was also found that the dominated wear mechanisms were abrasive and delaminated at the lower stresses, while the delamination mechanism was intensified and a slight adhesion was observed during the higher applied normal loads.

关键词： Multi-directional forging Commercial pure titanium Tribological behavior Wear mechanisms

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