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Simultaneously improving the strength and ductility of AZ91/GNPs composites through decorating graphene nanoplatelets with MgO

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Journal of Materials Science & Technology 2024年第16期183卷 133-151页

作者： Pingbo Wang Jun Shen Tijun Chen Jiqiang Ma Qinglin Li Shaokai Zheng State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi’an 710072China State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals Lanzhou University of TechnologyLanzhou 730050China

Magnesium matrix composites(MgMCs)have always suffered low strengthening efficiency and poor ductility due to the difficulties in pursuing the well-bonded ***,graphene nanoplatelets(GNPs)were decorated with magnesium oxide nanoparticles(MgO NPs)through chemical co-precipitation and then incorporated into AZ91 alloy to fabricate MgMCs via powder *** effect of MgO on the interface of the Mg/graphene system was investigated based on the first-principles calculations,and the result indicated that modifying GNPs with MgO NPs was helpful in improving the Mg-GNP interface *** interface structural analysis revealed that the MgO NPs were firmly bonded with both GNPs andα-Mg through the distortion area bonding and semi-coherent interfacial bonding,severing as a bridge to fasten the interface bonding of *** addition,the MgO NPs on GNPs acted as a barrier to prevent GNPs from seriously reacting with the AZ91 *** a result,the AZ91/MgO@GNPs composite was endowed with enhancements of 31%and 10%in the yield strength,and increments of 71%and 61%in elongation compared with the AZ91 alloy and AZ91/GNPs composite,respectively,exhibiting a more significant potential in optimizing the strength-toughness tradeoffcompared with the AZ91/***,the possible strengthening and toughening mechanisms were also discussed in *** work offers a relatively novel surface modification strategy to modulate the Mg-GNP interface for a simultane-ous improvement of strength and ductility.

关键词： Graphene nanoplatelets Magnesium oxide First-principles calculations Magnesium matrix composites Powder thixoforging

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Designing carboxymethyl cellulose based hydrogel electrolyte membranes enhanced by inorganic nanoparticle toward stable zinc anode

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Green Energy & Environment 2025年第3期10卷 537-550页

作者： Xiangye Li Yuan Li Yu Jiang Dahui Wang Fen Ran State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals Department of Polymeric Materials EngineeringSchool of Material Science and EngineeringLanzhou University of TechnologyLanzhou730050China

Aqueous zinc metal batteries have garnered substantial attention ascribing to affordability,intrinsic safety,and environmental benignity Nevertheless,zinc metal batteries yet are challenged with potential service life issues resulted from dendrites and side *** this paper,a strategy of nanoparticles doped hydrogel is proposed for constructing carboxymethyl cellulose/graphite oxide hybrid hydrogel electrolyte membranes with exceptional ionic conductivity,anti-swelling property,and simultaneously addressing the dendrites and parasitic *** pivotal functions of the carboxymethyl cellulose/graphite oxide hydrogel electrolyte in mitigating hydrogen evolution and fostering accelerated Zn deposition have been elucidated based on principles of thermodynamic and reaction *** carboxymethyl cellulose/graphite oxide hydrogel electrolyte endows exceptional cycling longevity (800 h at 1 mA cm^(-2)/1 mAh cm^(-2)) for Znjj Zn battery,as well as high Coulombic efficiency for Znjj Cu battery (averagely 99.14%within 439 cycles at 1 mA cm^(-2)/1 mAh cm^(-2)).The assembled Znjj NH_(4)V_(4)O_(10)battery delivers a high reversible specific capacity of 328.5 mAh g^(-1)at 0.1 A g^(-1).Moreover,the device of Znjj NH_(4)V_(4)O_(10)pouch battery remains operational under severe conditions like bending and *** work provides valuable reference in developing inorganic nanoparticle hybrid hydrogel electrolyte for realizing high-performance zinc metal batteries.

关键词： Carboxymethyl cellulose Graphite oxide Hydrogel electrolyte Anti-swelling

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Vanadium nitride quantum dots@carbon skeleton anode material synthesized via in situ oxidation initiation strategy

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Tungsten 2024年第3期6卷 561-573页

作者： Yi-Han Fu Yuan-You Peng Lei Zhao Tian-Qi He Mei-Mei Yuan Hao Dang Rui Liu Fen Ran State Key Laboratory of Advanced Processing and Recycling of Non-Ferrous Metals School of Materials Science and EngineeringLanzhou University of TechnologyLanzhou 730050China

Vanadium nitride(VN)has received significant attention as a potential negative electrode material due to its remarkable theoretical and physical ***,the electrochemical performance needs to be improved due to its low specific surface area and the issue of being easily dissolved in *** have shown that the composite structure of carbon-coated nano sc ale VN particles could significantly increase the specific surface area of VN,and more importantly,and the carbon matrix can effectively restrain the dissolution of VN particles in the electrolyte,thereby improving its chemical and electrochemical performance,including specific capacity and cycling ***,VN quantum dots are synthesized and protected by uniformly coating the carbon skeleton on its surface via an in situ strategy of oxidation initiation,which initiates dopamine polymerization,forming a crystalline complex of polydopamine and *** heat treatment,the product is a composite material with VN quantum dots embedded in the amorphous carbon *** resulting smallsized and crosslinked carbon particles formed a graded pore structure,more reasonable channels provided for electrolyte ions transport *** the composite material was used as the negative electrode material for supercapacitors,it exhibits the specific capacity of 391.9 F·g^(-1)at a current density of 0.5 A·g^(-1)and excellent capacity retention rate of 83.6%after *** synthesis method of this quantum dot could be applied to other metal compounds and has potential applications in catalysis,environmental protection,and other fields.

关键词： In situ initiation Vanadium nitride Quantum dots Anode Supercapacitors

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Bioabsorbable fabrication of molybdenum nitride/carbon nanocomposites for supercapacitors and metal ion batteries with robust stability

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Rare metals 2023年第12期42卷 4212-4225页

作者： Qiang-Hong Wu Huan-Zhong Zeng You-Zhi Wu Fen Ran State Key Laboratory of Advanced Processing and Recycling of Non-Ferrous Metals School of Materials Science and EngineeringLanzhou University of TechnologyLanzhou 730050China

Metal nitride is one of the best anode materials of the energy storage device;however,the low stability of the pure metal nitride limits its wide *** this work,a new method of bioabsorbable fabrication was developed for preparing molybdenum nitride that corporates into the porous carbon *** molybdenum ions in pollutions could be easily absorbed by Ligustrum quihoui,and the transportation,accumulation,and circulation of molybdenum ions in Ligustrum quihoui were *** obtained composite material of biochar and molybdenum nitride is employed as anode material of supercapacitors and batteries which exhibits good electrochemical performance,especially the rate and long lifespan ***,it is found that the specific capacity is344 F·g^(-1)at current density of 0.5 A·g^(-1)in 2 mol·L^(-1)KOH,and the capacitance retention and coulomb efficiency are above 90%after 10,000 *** should be noted that the novel approach combines fabricating anode materials with advanced nanostructure and suppressing the environmental problems with metal pollution at the same time.

关键词： Metal pollution Ligustrum quihoui Supercapacitors Metal ions batteries Anode materials

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Electronic modulation towards MOFs as template derived CoP via engineered heteroatom defect for a highly effcient overall water splitting

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Journal of Energy Chemistry 2025年第2期101卷 598-607,I0012页

作者： Meijie Ding Zhiqiang Wei Dexue Liu Wenhua Zhao Qiang Lu Zhiming Li Qingsong Yu Chenggong Lu Hua Yang State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals Lanzhou University of TechnologyLanzhou 730050GansuChina School of Science Lanzhou University of TechnologyLanzhou 730050GansuChina

The reasonable design of material morphology and eco-friendly electrocatalysts are essential to highly efficient water *** is proposed that a promising strategy effectively regulates the electronic structure of the d-orbitals of CoP using cerium doping in this paper,thus significantly improving the intrinsic property and conductivity of CoP for water *** a result,the as-synthesize porous Ce-doped CoP micro-polyhedron composite derived from Ce-ZIF-67 as bifunctional electrocatalytic materials exhibits excellent electrocatalytic performance in both the oxygen evolution reaction(OER)and the hydrogen evolution reaction(HER),overpotentials of about 152 mV for HER at 10 mA cm^(-2)and about 352 mV for OER at 50 mA cm^(-2),and especially it shows outstanding long-term ***,an alkaline electrolyzer,using Ce0.04Co0.96P electrocatalyst as both the anode and cathode,delivers a cell voltage value of1.55 V at the current density of 10 mA cm^(-2).The calculation results of the density functional theory(DFT)demonstrate that the introduction of an appropriate amount of Ce into CoP can enhance the conductivity,and can induce the electronic modulation to regulate the selective adsorption of reaction intermediates on catalytic surface and the formation of O*intermediates(CoOOH),which exhibits an excellent electrocatalytic *** study provides novel insights into the design of an extraordinary performance water-splitting of the multicomponent electrocatalysts.

关键词： Hydrogen evolution Cerium Phosphides Oxygen evolution Water splitting

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Effects of infill patterns on properties of slurry extrusion-based additive manufactured shell moulds

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China Foundry 2025年

作者： Jiao Liu Hong-jun Liu Guo-liang Su Ya-min Li State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals Lanzhou University of Technology

Investment casting shell moulds are widely applied to cast alloys, but how to efficiently form a hierarchical porous structure inside the wall is an innovation and challenge. In this research, porous shell moulds with three infill patterns(rectilinear, grid, and honeycomb) were prepared using bauxite slurry and slurry extrusionbased additive manufacturing technology, and the effects of infill patterns on the properties were evaluated. The hierarchical pores inside the wall are composed of the macropores formed by infills and the micropores among bauxite particles. Different infill patterns result in changes in distribution and shape of pores, thereby affecting the properties of the shell moulds. The honeycomb pattern has more comprehensive advantages compared to the other two infill patterns. The samples prepared with the honeycomb pattern exhibit the highest bending strength(11.62 MPa) and porosity(41.6%), as well as good heat-transfer ability, with an average shrinkage rate within 2.0%.This work provides an attractive feasibility for fabricating shell moulds with hierarchical porous walls.

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Preparation of ultra-high ductility and high strength Mg-Sn-Zn-Zr alloy by differential thermal ECAP(DT-ECAP)induced heterogeneous structure

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Journal of Materials Science & Technology 2024年第32期199卷 222-245页

作者： Tianshui Zhou Bing Wang Yaqin Li Shiwen Hu Xiaoqiang Li Dexue Liu State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals Lanzhou University of TechnologyLanzhou 730050China School of Materials Science and Engineering Lanzhou University of TechnologyLanzhou 730050China

Developing high-ductility magnesium(Mg)alloys has become an imminent issue for their wide *** this work,a new Mg-Sn-Zn-Zr alloy with ultra-high ductility(elongation,*** 40%)and high ultimate tensile strength(UTS,~309-354 MPa)was prepared by a novel differential thermal equal-channel angular pressing(DT-ECAP).Heterogeneous structures,including bimodal grain structures and in-homogeneous distribution of second phases composed of banded structure and particle free zone(PFZ),were induced by DT-ECAP *** on the results of electron backscatter diffraction(EBSD),trans-mission electron microscopy(TEM),high-resolution TEM(HRTEM),and selected area electron diffraction(SAED),the bimodal grain structure originated from incomplete dynamic recrystallization(DRX)domi-nated by Zener pinning,strain-induced grain boundary migration(SIBM)and the limitation of polycrys-tallization due to lower dislocation ***,the bimodal distribution of second phases was highly associated with the defect density and initial *** importantly,the enhanced strength of DT-ECAPed alloys can be primarily attributed to hetero-deformation induced(HDI)strengthening,grain boundary strengthening,and precipitation ***,HDI hardening,texture weakening or randomizing activation of non-basal slip,high density of dislocations in sub-structures,and twining in-duced superior work-hardening effect,which was highly responsible for the ultra-high ductility in sixth pass(6P)*** current work provides a novel DT-ECAP process for inducing heterogeneous structure and offers beneficial insight into the development of ultra-high ductility and high strength for rare-earth-free Mg alloys via a combination of HDI strengthening and hardening and other vital mechanisms.

关键词： DT-ECAP process Heterogeneous structures HDI strengthening and hardening Mechanical properties Mg-Sn-Zn-Zr alloy

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Selenium-doped cathode materials with polyaniline skeleton for lithium-organosulfur batteries

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Journal of Energy Chemistry 2023年第4期79卷 148-157页

作者： Rong Zou Wenwu Liu Fen Ran State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals School of Materials Science and EngineeringLanzhou University of TechnologyLanzhou 730050GansuChina

Sulfur-containing polymer(SCP)is considered as an outstanding cathode material for lithium-sulfur ***,undesirable soluble polysulfides may shuttle in electrolyte,concluding long-chain Li_(2)S_(n)(n>4)and short-chain Li2Sn(n≤4),as well as the sluggish conversion kinetics are yet to be solved to enhance the performance of lithium-sulfur *** Se-doped sulfurized polyaniline with adjusted sulfur-chain-S_(x)-(x≤6)contribute to ensure the absence of long-chain polysulfides,and the skeleton with quinoid imine can endow strongly adsorption towards short-chain polysulfides by the reversible transition between deprotonated/protonated imine(-NH^(+)=and-N=),which offer double insurance against suppressing“shuttle effect”.Furthermore,Se atoms are doped into sulfurized polysulfides to accelerate the redox conversion and take a frontier orbital theory-oriented view into catalytic ***-doped sulfurized polyaniline as active materials for lithium-organosulfur batteries delivers good electrochemical performance,including high rate,reversible specific capacity(680 mA h g^(-1)at 0.1 A g^(-1)),and lower capacity decay rate only of 0.15%with near 100%coulomb efficiency during long-term *** work provides a valuable guiding ideology and promising solution for the chemistry-oriented structure design and practical application for lithium-organosulfur batteries.

关键词： Lithium-organosulfur batteries Selenium-doped Cathode materials Sulfur-containing polymer Frontier orbital theory

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Achieving high strength-ductility synergy in Mg-6Sn-3Zn-0.3Zr(wt.%)alloy via a combination of casting,pre-treatment and hot extrusion

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Journal of Magnesium and Alloys 2024年第11期12卷 4622-4645页

作者： Tianshui Zhou Yaqin Li Feifei Guo Qinglin Li Zhi Jia Dexue Liu School of Materials Science and Engineering Lanzhou University of TechnologyLanzhou 730050China State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals Lanzhou University of TechnologyLanzhou 730050China

Achieving the strength-ductility synergy in Mg alloys is a gigantic challenge,especially in rare-earth-free Mg *** this study,a new Mg-Sn-Zn-Zr alloy with high ultimate tensile strength(~284-326 MPa)without sacrificing elongation-to-failure(~22.1-27.6%)was developed by utilizing casting,pre-treatment and hot *** random rather than basal texture is observed both in as-cast and pre-treatment ***,the strong texture is effectively weakened via hot extrusion whilst remaining *** importantly,after hot extrusion,the grain sizes of as-cast and pre-treatment samples were significantly refined down to about 10μ*** of as-extruded microstructures of the alloy reveals that the grain refinement is highly associated with the particle stimulated nucleation(PSN)and continuous/discontinuous dynamic recrystallization(C/DDRX)***,the results suggest that the combination of pre-treatment and hot extrusion not only promotes multiplication of geometrically-necessary dislocations(GNDs)but enhances dynamic precipitation,which boosts the formation of fine and homogenous *** on the results of X-ray diffraction(XRD),transmission electron microscope(TEM)and selected area electron diffraction(SAED),the precipitates are Mg_(2)Sn ***,the main orientation relationship identified by high resolution TEM(HRTEM)between Mg_(2)Sn phases andα-Mg matrix could be described as(111)Mg_(2)Snor(220)Mg_(2)Sn∥(0001)Mgwith a coherent *** refined grains size,ultra-fine precipitates and high density of GNDs would substantially contribute to the enhancement of the strength and the corresponding contributions are calculated to be~183-185 MPa,~30.9-38 MPa and~14.2-31.7 MPa,***,texture weakening or randomizing,grain refinement and coherent interfaces are mainly responsible for the high *** current study can provide beneficial insights into the development of high-performance rare-earth-

关键词： Mg-Sn-Zn-Zr alloy Hot extrusion Pre-treatment Mechanical properties Microstructure evolution Strengthening and plasticity mechanisms

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Electrolyte effect on electrochemical behaviors of manganese fluoride material for aqueous asymmetric and symmetric supercapacitors

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Rare metals 2024年第3期43卷 1048-1061页

作者： Zheng-Hua He Jian-Fei Gao Ling-Bin Kong State Key Laboratory of Advanced Processing and Recycling of Non-Ferrous Metals Lanzhou University of TechnologyLanzhou730050China School of Materials Science and Engineering Lanzhou University of TechnologyLanzhou730050China

Exploring wide voltage window materials is not only an available measure to enhance the energy density of hybrid supercapacitor(HSCs),but also avoids the dynamic mismatch caused by different energy storage mechanisms of two electrodes in assembled symmetrical ***,there are few reports about the wide potential window materials except Bi_(2)O_(3)and VO_(2).Therefore,the MnF_(2)synthesized by solvothermal reaction was served as the electrode for *** MnF_(2)exhibited electrochemical activity in alkaline solution in three-electrode system,especially with a wide potential window from-0.8 to+0.5 V in 2 mol·L^(-1)***,the assembled MnF_(2)//MnF_(2)symmetrical HSC had a potential window of 1.5 V,and it exhibited outstanding long-cycle ***,when MnF_(2)was taken as the negative and positive respectively,the potential windows of asymmetric devices CoMoO_(4)//MnF_(2)and MnF_(2)//Activated Carbon(AC)could reach 1.3 and 1.45 V,respectively,showing excellent cycle *** work shows that MnF_(2)material has great research value in HSC,and provides a new research direction for developing high-performance devices.

关键词： Manganese fluoride Potential window Hybrid supercapacitors Electrochemical performance

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