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A self-powered system to electrochemically generate ammonia driven by palladium single atomelectrocatalyst

SusMat 2024年第5期4卷 178-188页

作者： Hao Hu Shuyuan Pan Zhiyong Ma Kaiyi Liu Yi Li Haifeng Bao Chengwei Deng Fang Luo Zehui Yang State Key Laboratory of New Textile Materials&Advanced Processing Technology College of Materials Science and EngineeringWuhan Textile UniversityWuhanChina Faculty of Materials Science and Chemistry China University of GeosciencesWuhanChina Shaanxi Coal Chemical Industry Technology Research Institute Co. Ltd.Xi’anChina State Key Laboratory of Space Power-Sources Technology Shanghai Institute of Space Power SourcesShanghaiChina Hubei Key Laboratory for New Textile Materials and Applications Wuhan Textile UniversityWuhanChina

The utilization of single atoms(SAs)as trifunctional electrocatalyst for nitro-gen reduction,oxygen reduction,and oxygen evolution reactions(NRR,ORR,and OER)is still a formidable ***,we devise one-pot synthesized palladium SAs stabilized on nitrogen-doped carbon palladium SA electrocat-alyst(Pd-SA/NC)as efficient trifunctional electrocatalyst for NRR,ORR,and ***-SA/NC performs a robust catalytic activity toward NRR with faradaic efficiency of 22.5%at-0.25 V versus reversible hydrogen electrode(RHE),and the relative Pd utilization efficiency is enhanced by 17-fold than Pd-NP/*** addition,the half-wave potential reaches 0.876 V versus RHE,amounting to a 58-time higher mass activity than commercial Pt/***,the overpotential at 10 mA cm-2 is as low as 287 mV for Pd-SA/NC,outperforming the commer-cial IrO2 by 360 times in turnover frequency at 1.6 V versus ***,the assembled rechargeable zinc-air battery(ZAB)achieves a maximum power den-sity of 170 mW cm-2,boosted by 2.3 times than Pt/C–*** constructed ZABs efficiently power the NRR-OER system to electrochemically generate ammonia implying its superior trifunctionality.

关键词： nitrogen reduction reaction oxygen evolution reaction oxygen reduction reaction single atom

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Significant reduction of anisotropy in stress relaxation aging and mechanical properties improvement for 2195 Al-Cu-Li alloy subjected to plastic loading

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Chinese Journal of Aeronautics 2025年第1期38卷 217-234页

作者： Liwen ZHANG Heng LI Tianjun BIAN Changhui WU Yanfeng YANG State Key Lab of Solidification Processing School of Materials Science and EngineeringNorthwestern Polytechnical UniversityXi’an 710072China Xi’an Aeronautical Polytechnic Institute Xi’an 710089China Shaanxi Key Laboratory of High-Performance Precision Forming Technology and Equipment Northwestern Polytechnical UniversityXi’an 710072China

Although the plastic loading can enhance creep deformation and yield strength,the anisotropic Stress Relaxation Aging(SRA)behavior and mechanism under plastic loading remain unclear,which presents a significant challenge in accurately shaping aluminum alloy *** this study,the SRA behavior of 2195-T4 Al-Cu-Li alloys were thoroughly studied under initial loading stresses within the elastic(210/250 MPa)and plastic(380/420 MPa)ranges at 180℃by stress relaxation and tensile tests as well as microstructure *** findings reveal that compared with those under elastic loadings,in-plane anisotropy(IPA)values of the stress relaxation amount,yield strength and fracture elongation under plastic loadings are reduced by 60%–80%,70%–90% and 72%–89%,***,IPA values of precipitate size in grains and PrecipitationFree Zones(PFZ)width at grain boundaries under plastic loading decrease by 31.4%and 94.4%*** results indicate plastic loading significantly weakens the anisotropic SRA behavior,owing to numerous uniformly distributed fine T1phases and small IPA values of both T1precipitates size and PFZ width in various loading *** with those of elastic loadingaged alloys,yield strength of plastic loading-aged alloys shows high strength-ductility because of the combined effect of closely dispersed fine T1precipitates,narrowed PFZ and numerous sheared and rotated T1phases at different locations during tensile *** uniformly distributed larger Kernel Average Misorientation(KAM)and Schmidt factor values of the plastic loading-aged alloy,as well as the cross-slip generated,also help to enhance the strength and ductility of the alloy.

关键词： Aluminum-lithium alloy Stress relaxation aging Precipitation-free zones In-plane anisotropy Stress relaxation

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Asymmetric wettability channel of membranes for water and oil concurrent recovery from emulsions

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Science China materials 2025年

作者： Lu Tie Xiaoping Zheng Department of Applied Physics School of Science Lanzhou University of Technology State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals School of Materials Science and Engineering Lanzhou University of Technology

Oily wastewater is a global water pollutant, while trace water in transportation fuels/lubricants threatens vehicle safety. advanced oil-water separation technologies are crucial for mitigating water pollution and upgrading oil purity. Conventional separation methods like centrifugation(density-dependent [1]) and flocculation(chemical additives, secondary pollution [2]) have limitations, whereas membrane filtration is widely used in the oil-water separation [3,4].

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Effect of electrochemical hydrogen charging on the microstructure and mechanical behavior of a duplex structured Mg-8wt.%Li alloy

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Journal of Magnesium and Alloys 2025年第2期13卷 668-680页

作者： Shuo Wang Daokui Xu Baojie Wang Dongliang Wang Zhiqiang Zhang Li Liu Jie Chen Key Lab of Electromagnetic Processing of Materials Ministry of EducationNortheastern UniversityShenyang110819China Key Laboratory of Nuclear Materials and Safety Assessment Institute of Metal ResearchChinese Academy of SciencesShenyang110016China Engineering Research Center of Advanced Materials Preparing Technology Ministry of EducationNortheastern UniversityShenyang110819China Binzhou Institute of Technology BinzhouShandong Province256606China Shandong Key Laboratory of Advanced Aluminium Materials and Technology BinzhouShandong Province256606China School of Environmental and Chemical Engineering Shenyang Ligong UniversityShenyang110159China Spallation Neutron Source Science Center Dongguan523803China

In this work,through performing microstructural characterization,tensile testing and failure analysis,the influence of electrochemical hydrogen charging on the microstructure and mechanical behavior of an as-cast Mg-8wt.%Li alloy was *** revealed that after being hydrogen charged at 50 mA/cm2 for respectively 3 h,6 h and 18 h in 0.1 M NaCl solution,obvious HID occurred and the damage degree was gradually increased with the hydrogen charging *** the sample being hydrogen charged for 3 h,micro pores with the diameter ranging from 10~30µm were formed and preferentially present inα-Mg ***,micro cracks with the length ranging from 10~50µm mainly initiated inα-Mg phase,atα-Mg/β-Li interfaces and the peripheries of *** the increase of hydrogen charging time,the numbers of pores and cracks were obviously *** results revealed that the hydrogen charging can simultaneously decrease the tensile strength and ductility of the *** with the uncharged sample,the tensile yield strength,ultimate tensile strength and the elongation ratio to failure were respectively reduced by 5.7%,7.3%,31.7%for the 3h-charged sample and 24.6%,24.8%,67.0%for the 18h-charged *** analysis indicated that hydrogen charging can induce the brittle cracking of the alloy and the size of brittle cracking region being composed of quasi-cleavage facets and interfacial cracks on the fracture surfaces was increased with the hydrogen charging time.

关键词： Magnesium-lithium alloy Microstructure Hydrogen-induced damage Hydrogen embrittlement Mechanical behavior

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Decoupling the nonthermal effect of current by electrically assisted crystal plasticity modeling of Ni-based single crystal superalloys

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Journal of materials Science & technology 2025年第1期204卷 91-103页

作者： Jia Gao Hongwei Li Xin Zhang Guangda Shao Zhiyu Xiang Xinxin Sun State Key Laboratory of Solidification Processing School of Materials Science and EngineeringNorthwestern Polytechnical UniversityXi’an 710072China Shaanxi Key Laboratory of High-performance Precision Forming Technology and Equipment Northwestern Polytechnical UniversityXi’an 710072China School of Mechanical and Electrical Engineering Northwestern Polytechnical UniversityXi’an 710072China Ministry of Industry and Information Technology Key Laboratory of Aeroengine Technology Northwestern Polytechnical UniversityXi’an 710072China

The electrically assisted(EA)deformation process has received considerable attention in recent years,ac-companied by research on current-induced deformation ***,there are still challenges in eliminating thermal effects,which have prevented a comprehensive understanding of the underlying current-induced *** for a single crystal(SC)in research provides advantages in decou-pling the nonthermal effect of electric current at smaller scales and eliminating the complex interactions that exist in polycrystalline ***,the innovation of this work lies in decoupling the non-thermal effect of electric current and conducting a comprehensive analysis of anisotropic deformation and mechanisms within a Ni-based SC with different crystallographic axes and various current directions dur-ing electrically assisted tensile simulation.A significant tension axis direction in the SC during EA tension was induced by the combination of a higher current direction factor(|cosθ|)and a dimensionless factor for the current density(|J^(α)/J_(0)^(α)|)along the[100]*** stress drop within the SC due to the nonthermal effect of electric current generally increased with increasing current *** was attributed to the increased dislocation density differences and decreased *** increased stress anisotropy of the SC at a current direction of 45°was attributed to fewer activated(111)slip systems and the pinning effect of more dislocations within these *** study advances our understanding of the thermal and nonthermal effects of electric current and offers valuable insights for the informed application of EA deformations in industrial and aerospace settings with SC superalloys.

关键词： Electrically assisted(EA)tension Single crystal superalloys Nonthermal effect Anisotropy Tension axis Current direction

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High cycle fatigue performance at 650℃and corresponding fracture behaviors of GH4169 joint produced by linear friction welding

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Chinese Journal of Aeronautics 2025年第1期38卷 622-637页

作者： Shitong MA Xiawei YANG Zhenguo GUO Yu SU Xinyuan HE Ju LI Jun TAO Bo XIAO Wenya LI State Key Laboratory of Solidification Processing Shaanxi Key Laboratory of Friction Welding TechnologiesSchool of Materials Science and EngineeringNorthwestern Polytechnical UniversityXi’an 710072China Aeronautical Key Laboratory for Welding and Joining Technologies AVIC Manufacturing Technology InstituteBeijing 100024China Department of Mechanical Engineering City University of HongKongHongKongChina

GH4169 joints manufactured by Linear Friction Welding(LFW)are subjected to tensile test and stair-case method to evaluate the High Cycle Fatigue(HCF)performance at 650℃.The yield and ultimate tensile strengths are 582 MPa and 820 MPa,*** HCF strength of joint reaches 400 MPa,which is slightly lower than that of Base Metal(BM),indicating reliable quality of this type of *** microstructure observation results show that all cracks initiate at the inside of specimens and transfer into deeper region with decrease of external stress,and the crack initiation site is related with microhardness of *** Electron Backscattered Diffraction(EBSD)results of the observed regions with different distances to fracture show that plastic deformation plays a key role in HCF,and the Schmid factor of most grains near fracture exceeds *** addition,the generation of twins plays a vital role in strain concentration release and coordinating plastic deformation among grains.

关键词： High cycle fatigue GH4169 superalloy Linear friction welding Fracture mechanism Microstructure evolution

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High-strength and thermally stable TiB_(2)-modified Al-Mn-Mg-Er-Zr alloy fabricated via selective laser melting

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International Journal of Minerals,Metallurgy and materials 2024年第10期31卷 2221-2232页

作者： Jiang Yu Yaoxiang Geng Yongkang Chen Xiao Wang Zhijie Zhang Hao Tang Junhua Xu Hongbo Ju Dongpeng Wang School of Materials Science and Engineering Jiangsu University of Science and TechnologyZhenjiang 212003China Beijing Advanced Innovation Center for Materials Genome Engineering Institute for Advanced Materials and TechnologyUniversity of Science and Technology BeijingBeijing 100083China National Engineering Research Center of Near-Net Shape Forming for Metallic Materials Guangdong Provincial Key Laboratory for Processing and Forming of Advanced Metallic MaterialsSouth China University of TechnologyGuangzhou 510640China CEMMPRE-Centre for Mechanical Engineering Materials and Processes Department of Mechanical EngineeringUniversity of CoimbraRua Luís Reis SantosCoimbra 3030-788Portugal

To increase the processability and plasticity of the selective laser melting(SLM)fabricated Al-Mn-Mg-Er-Zr alloys,a novel TiB_(2)-modified Al-Mn-Mg-Er-Zr alloy with a mixture of Al-Mn-Mg-Er-Zr and nano-TiB_(2) powders was fabricated by *** pro-cessability,microstructure,and mechanical properties of the alloy were systematically investigated by density measurement,microstruc-ture characterization,and mechanical properties *** alloys fabricated at 250 W displayed higher relative densities due to a uni-formly smooth top surface and appropriate laser energy *** maximum relative density value of the alloy reached(99.7±0.1)%,demonstrating good *** alloy exhibited a duplex grain microstructure consisting of columnar regions primarily and equiaxed regions with TiB_(2),Al6Mn,and Al3Er phases distributed along the grain *** directly aging treatment at a high tem-perature of 400℃,the strength of the SLM-fabricated TiB_(2)/Al-Mn-Mg-Er-Zr alloy increased due to the precipitation of the secondary Al6Mn *** maximum yield strength and ultimate tensile strength of the aging alloy were measured to be(374±1)and(512±13)MPa,*** SLM-fabricated TiB_(2)/Al-Mn-Mg-Er-Zr alloy demonstrates exceptional strength and thermal stability due to the synergistic effects of the inhibition of grain growth,the incorporation of TiB_(2) nanoparticles,and the precipitation of secondary Al6Mn nanoparticles.

关键词： selective laser melting aluminum alloy processability mechanical properties thermal stability

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Probing the interlayer mechanical coupling of 2D layered materials-A review

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Progress in Natural Science:materials International 2022年第5期32卷 528-537页

作者： Yinghui Sun Yufei Sun Rongming Wang Kai Liu Beijing Advanced Innovation Center for Materials Genome Engineering Beijing Key Laboratory for Magneto-Photoelectrical Composite and Interface Science School of Mathematics and Physics University of Science and Technology Beijing State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and Engineering Tsinghua University Key Laboratory of Advanced Materials of Ministry of Education School of Materials Science and Engineering Tsinghua University

Two-dimensional(2D) layered materials are assembled through the intralayer covalent bonds and interlayer van der Waals(vdWs) interactions. The relatively weak interlayer vdWs interactions result in the weak interlayer mechanical coupling between layers, which strongly impacts the overall mechanical properties of multilayer 2D materials or heterostructures. Experimentally probing the interlayer mechanical coupling is of vital importance on the accumulation of fundamental parameters for their applications in flexible and stretchable devices, yet there are hardly comprehensive reviews in this research field. In this review, we firstly introduce the probing methods of interlayer mechanical coupling, including high-frequency and ultralow-frequency Raman characterizations,nanoindentation of multilayer 2D materials or heterostructures, surface indentation, pressurized blister test,characterization of spontaneously formed nanoblisters, and nano-friction tests. Based on the analysis and comparison of the existing methods and results, we also discuss the advantages and limitations of each ***, the challenges and opportunities in this promising field are discussed. This review summarizes the recent progress in the probing of interlayer mechanical coupling of 2D layered materials and will provide important reference for the rational design of flexible and stretchable devices.

关键词： van der Waals interaction Mechanical properties Indentation Heterostructures

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Modulation of the octahedral structure and potential superconductivity of La_(3)Ni_(2)O_(7)through strain engineering

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Science China(Physics,Mechanics & Astronomy) 2025年第3期68卷 145-152页

作者： Zihao Huo Zhihui Luo Peng Zhang Aiqin Yang Zhengtao Liu Xiangru Tao Zihan Zhang Shumin Guo Qiwen Jiang Wenxuan Chen Dao-Xin Yao Defang Duan Tian Cui Key Laboratory of Material Simulation Methods&Software of Ministry of Education State Key Laboratory of Superhard MaterialsCollege of PhysicsJilin UniversityChangchun130012China Center for Neutron Science and Technology Guangdong Provincial Key Laboratory of Magnetoelectric Physics and DevicesState Key Laboratory of Optoelectronic Materials and TechnologiesSchool of PhysicsSun Yat-sen UniversityGuangzhou510275China MOE Key Laboratory for Non-equilibrium Synthesis and Modulation of Condensed Matter Shaanxi Province Key Laboratory of Advanced Functional Materials and Mesoscopic PhysicsSchool of PhysicsXi’an Jiaotong UniversityXi’an710049China Institute of High Pressure Physics School of Physical Science and TechnologyNingbo UniversityNingbo315211China

The recent transport measurements of La_(3)Ni_(2)O_(7)uncovered a“right-triangle”shape of the superconducting dome in the pressure-temperature(P-T)phase *** by this,we perform theoretical first-principles studies of La_(3)Ni_(2)O_(7)with the pressure ranging from 0 to 100 ***,we reveal a pressure dependence of the Ni-d_(z^(2))electron density at the Fermi energy(n_(z)^(E_(F)))that highly coincides with such *** this basis,we further explore the electronic structure under uniaxial *** tracking the stress response of n_(z)^(E_(F)),we propose that superconductivity can be achieved by applying only ~2GPa of compression along the c *** idea is further exemplified from the perspectives of lattice distortion,band structure,Fermi surface and superconducting phase *** also discuss the possible charge modulation under the stress and provide an insight into the relation between nz E Fand the superconducting T_(c)in La_(3)Ni_(2)O_(7)*** study provides new routes to the search of high-T_(c)superconductors in future experiments.

关键词： nickelate superconductors density functional theory strong correlated systems strain engineering

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Effect of cross rolling on the microstructure and mechanical performance of a dual-phase structured Mg-8Li-6Zn-1Y(in wt.%)alloy

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Journal of materials Science & technology 2024年第9期176卷 132-144页

作者： Dongliang Wang Daokui Xu Baojie Wang Changjian Yan Shuo Wang Xiangbo Xu Lan Zhang Cuilan Lu Key Laboratory of Nuclear Materials and Safety Assessment Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China Binzhou Institute of Technology Binzhou 256606China Shandong Key Laboratory of Advanced Aluminium Materials and Technology Binzhou 256606China School of Environmental and Chemical Engineering Shenyang Ligong UniversityShenyang 110159China Institute of Corrosion Science and Technology Guangzhou 510070China Key Lab of Electromagnetic Processing of Materials Ministry of EducationNortheastern UniversityShenyang 110819China

The microstructure and mechanical performance of the unidirectionally and cross-directionally rolled Mg-8Li-6Zn-1Y(in wt.%)sheets have been investigated and *** reveals that after the unidirectional rolling(UR),the broken I-phase particles are aggregated at theα-Mg/β-Li phase ***,the cross-rolling(CR)process can not only severely break the bulk I-phase,but also cause the obviously uniform distribution of I-phase particles in the matrix ***,the average grain size of the CR samples is 3.61μm and about 50%that of the UR *** maximum texture intensities ofα-Mg andβ-Li phases in the CR samples are slightly stronger than those in the UR *** results demonstrate that the CR process can effectively enhance the tensile properties and remarkably reduce the mechanical anisotropy of the *** the UR samples,the yield strength,ultimate tensile strength,and elongation ratio along the rolling direction(RD)are 164 MPa,198 MPa,and 16.4%,whereas those along the transverse direction(TD)are 157 MPa,185 MPa,and 22.0%,*** the CR samples,their mechanical properties are basically the same and the mechanical anisotropy is almost *** yield strength,ultimate tensile strength,and elongation ratio along the cross-rolling direction 1(CRD1)and 2(CRD2)are respectively measured to be 181 MPa and 182 MPa,220 MPa and 218 MPa,20.6%and 20.7%.Failure analysis indicates that for the UR samples being tensile tested along the RD and TD,microcracks are preferentially initiated in the region of aggregated I-phase *** the CR samples being tensile tested along both two cross-rolling directions,the initiation of micro-cracks mainly occurs at the I-phase/matrix phase interfaces and in the interior of matrix phases.

关键词： Magnesium-lithium alloy Cross-rolling I-phase Microstructure Mechanical performance

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