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Modified room temperature solid-state synthesis of yttria-stabilized zirco.ia(YSZ) nano-powders for solid oxide fuel cells

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Journal of Rare Earths 2023年第9期41卷 1385-1391,I0004页

作者： Xiaoqian Xu Yurun Feng Zhaoyu Zhong Xue Guo Zhenhao Zhang Jiao Li Shikai Zhao Shigang Wu Haibin Sun School of Materials Science and Engineering Shandong University of TechnologyZibo 255000China shandong Yasai ceramic Technology co. Ltd.Jinan 271100China shandong Industrial ceramics Research&Design institute co. Ltd.Zibo 255000China

High-performance solid oxide fuel cell(SOFC) is in urgent need of high-quality electrolyte powders with high reactivity and chemical ***,8 mol% Y_(2)O_(3) doped ZrO_(2)(YSZ) nano-powders were synthesized by an improved solid-state reaction method at ambient temperature,and were applied to the fabrication of SOFC *** nano-powders show average grain sizes of ^(2)0 nm and high dispersibility,which is co.parable with or even better than some other chemical *** from their high reactivity,dense YSZ electrolytes(relative density of 97.9%) can be obtained at a relatively low sintering temperature of 1400℃.The optimized electrical co.ductivity reaches up to a high value of0.034 S/cm at 800 0C in *** anode supported single cell with the co.struction of Ni-YSZ/YSZ/Sm_(0.2)Ce_(0.8)O_(2-δ)(SDC)/La_(0.6)Sr_(0.4)co.(0.2)Fe_(0.8)O_(3-δ)(LSCF) exhibits the peak power density of 0.827 W/cm^(2) at800℃ while taking wet H_(2) as fuels and ambient air as oxidants.

关键词： Room temperature solid-state reaction YSZ electrolyte High sintering activity High ionic co.ductivity Rare earths

Effects of Cr2O3 doping on the microstructure and electrical properties of （Ba,Ca）（Zr,Ti）O3 lead-free ceramics

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Frontiers of Materials Science 2016年第2期10卷 203-210页

作者： Xiang XlA Xiangping JIANG Chao CHEN Xingan JIANG Na TU Yunjing CHEN Jiangxi Key Laboratory of advanced ceramic Materials School of Materials Science and Engineering Jingdezhen Ceramic Institute Jingdezhen 333001 China

Lead-free ceramics （Ba0.85Ca0.15）（Zr0.1Ti0.9）O3-x wt,%Cr2O3 （BCZT-xCr） were prepared via the co.ventional solid-state reaction method. The microstructure and electrical properties of BCZT-xCr samples were systematically studied. XRD and Raman results showed that all samples possessed a single phased perovskite structure and were close to the morphotropic phase boundary （MPB）. With the increase of the Cr co.tent, the rhombohedral-tetragonal phase transition temperature （TR-T） increases slightly, and the Curie temperature （Tc） shifts towards the low temperature side. XPS analysis reveals that Cr3. and Cr5＊ ions co.existed in Cr-doped BCZT ceramics, indicating the different impact on the electrical properties from Cr ions as ＂acceptor＂ or ＂donor＂. For the x = 0.1 sample, relative high piezoelectric co.stants d33 （-316 pC/N） as well as high Qm （-554） and low tan6 （-0.8%） were obtained. In addition, the AC co.ductivity was also investigated. Hopping charge was co.sidered as the main co.duction mechanism at low temperature. As the temperature increases, small polarons and oxygen vacancies co.duction played important roles.

关键词： lead-free ceramics electrical properties BCZT XPS analysis

Metal-Organic Framework Enabling Poly(Vinylidene Fluoride)-Based Polymer Electrolyte for Dendrite-Free and Long-Lifespan Sodium Metal Batteries

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Energy & Environmental Materials 2024年第1期7卷 68-76页

作者： Yusi Lei Liang Yue Yuruo Qi Yubin Niu Shujuan Bao Jie Song Maowen Xu Faculty of Materials and Energy Institute for Clean Energy&Advanced MaterialsSouthwest UniversityChongqing 400715China shandong Zero-One-Four advanced Materials co. Ltd.Feicheng 271099China

Sodium dentrite formed by uneven plating/stripping can reduce the utilization of active sodium with poor cyclic stability and,more importantly,cause internal short circuit and lead to thermal runaway and ***,sodium dendrites and their related problems seriously hinder the practical application of sodium metal batteries(SMBs).Herein,a design co.cept for the inco.poration of metal-organic framework(MOF)in polymer matrix(polyvinylidene fluoride-hexafluoropropylene)is practiced to prepare a novel gel polymer electrolyte(PH@MOF polymer-based electrolyte[GPE])and thus to achieve high-performance *** addition of the MOF particles can not only reduce the movement hindrance of polymer chains to promote the transfer of Na^(+)but also anchor anions by virtue of their negative charge to reduce polarization during electrochemical reaction.A stable cycling performance with tiny overpotential for over 800 h at a current density of 5 mA cm^(-2)with areal capacity of 5 mA h cm^(-2)is achieved by symmetric cells based on the resulted GPE while the Na_(3)V_(2)O_(2)(PO_(4))_(2)F@rGO(NVOPF)|PH@MOF|Nacell also displays impressive specific cycling capacity(113.3 mA h g^(-1)at 1 C)and rate capability with co.siderable capacity retention.

关键词： dendrite-free gel polymer electrolyte metal organic framework sodium batteries

Electronic and Optical Properties of KNbO_3,NaNbO_3 and K_(0.5) Na_(0.5) NbO_3 in Paraelectric Cubic Phase:a co.parative First-principles Study

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Chinese Journal of Structural Chemistry 2012年第8期31卷 1095-1104页

作者：周树兰赵显江向平韩晓东 Department of Material Science and Engineering Jingdezhen Ceramics InstituteKey Laboratory of Advanced Ceramic Material of Jiangxi Province State Key Laboratory of Crystal Material Institute of Crystal MaterialShandong University

The structural,electronic and optical properties of KNbO 3 （KN）,NaNbO3（NN）and K05 Na0.5NbO3（KNN） in paraelectric cubic phase were calculated employing the plane-wave pseudopotential method based on density functional theory （DFT）.The calculated electronic structures of the three crystals show similar features in the valence bands and the lower co.duction ***,the structures in higher co.duction bands differ markedly due to the effect of Na and K *** calculated optical properties reveal that the features of optical spectrum at low energy are dominated by the transitions from O2p valence bands to Nb 4d co.duction bands and those at high energy are related to the transitions to K 4s4p and/or Na 3s3p ***,the optical co.stants of KNN are approximately the average of KN and NN at high ***,the optical properties of KNN in high energy region can probably be altered by changing the ratio of Na/K.

关键词： the first principle electronic structure optical properties (K Na)NbO 3

Effect of Al2O3sf addition on the friction and wear properties of (SiCp+Al2O3sf)/Al2024 co.posites fabricated by pressure infiltration

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International Journal of Minerals,Metallurgy and Materials 2018年第3期25卷 375-382页

作者： Hui Xu Gong-zhen Zhang Wei Cui Shu-bin Ren Qian-jin Wang Xuan-hui Qu institute for advanced Materials and Technology University of Science and Technology Beijing Beijing 100083 China shandong Yinguang Yuyuan Light Metal Precise Forming co. Ltd. Linyi 273400 China

Aluminum(Al) 2024 matrix co.posites reinforced with alumina short fibers(Al_2O_(3sf)) and silico. carbide particles(SiC_p) as wear-resistant materials were prepared by pressure infiltration in this study. Further, the effect of Al_2O_(3sf) on the friction and wear properties of the as-synthesized co.posites was systematically investigated, and the relationship between volume fraction and wear mechanism was discussed. The results showed that the addition of Al_2O_(3sf), characterized by the ratio of Al_2O_(3sf) to SiC_p, significantly affected the properties of the co.posites and resulted in changes in wear mechanisms. When the volume ratio of Al_2O_(3sf) to SiC_p was increased from 0 to 1, the rate of wear mass loss(K_m) and co.fficients of friction(co.s) of the co.posites decreased, and the wear mechanisms were abrasive wear and furrow wear. When the volume ratio was increased from 1 to 3, the co. decreased co.tinuously; however, the K_m increased rapidly and the wear mechanism became adhesive wear.

关键词： aluminum matrix co.posites silico. carbide particles alumina short fibers friction properties wear properties infiltration

Stabilizing co.(3)0_(4)nanorods/N-doped graphene as advanced anode for lithium-ion batteries

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Frontiers of Materials Science 2021年第2期15卷 216-226页

作者： Yishan WANG Xueqian ZHANG Fanpeng MENC Cuangwu WEN School of Materials Science and Engineering Shandong University of TechnologyZibo 255000China shandong Guiyuan advanced ceramic co.pany Limited Zibo 255086China School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China

Trico.alt tetroxide(co.(3)O_(4))is one of the promising anodes for lithium-ion batteries(LIBs)due to its high theoretical ***,the poor electrical co.ductivity and the rapid capacity decay hamper its practical *** this work,we design and fabricate a hierarchical co.(3)O_(4)nanorods/N-doped graphene(co.(3)0_(4)/NG)material by a facile hydrothermal *** nitrogen-doped graphene layers co.ld buffer the volume change of co.(3)0_(4)nanorods during the delithium/lithium process,increase the electrical co.ductivity,and profit the diffusion of *** an anode,the co.(3)O_(4)/NG material reveals high specific capacities of 1873.8 mA h g^(-1)after 120 cycles at 0.1 A·g^(-1)as well as 1299.5 mA·h·g^(-1)after 400 cycles at 0.5 A·g^(-1).Such superior electrochemical performances indicate that this work may provide an effective method for the design and synthesis of other metal oxide/N-doped graphene electrode materials.

关键词： co.(3)O_(4) graphene lithium-ion battery anode

Microstructural features of biomedical co.alt–chromium–molybdenum(co.rMo) alloy from powder bed fusion to aging heat treatment

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Journal of Materials Science & Technology 2020年第10期42卷 146-156页

作者： Haoqing Li Ming Wang Dianjun Lou Weilong Xia Xiaoying Fang institute for advanced Manufacturing Shandong University of TechnologyZibo255049China School of Mechanical Engineering Shandong University of TechnologyZibo255049China D Printing Medical Engineering and Technology Center Shinva Medical Instrument Co.LTDZibo255086China

The design freedom of powder bed fusion process selective laser melting(SLM)enables flexibility to manufacture customized,geometrically co.plex medical implants directly from the CAD *** alloys have adequate wear and co.rosion resistance,fatigue strength,and bioco.patibility,which enables the alloys to be widely used in medical *** work aims to investigate the evolution of microstructures and their influence on tribological property of co.rMo alloy processed by SLM and aging heat *** results showed that very weaktexture along the building direction and microsegregation along cellular boundaries were *** presence of high residual stress and fine cellular dendrite structure has a pronounced hardening effect on the as-SLM and aging-treated alloys at moderate ***,the hexagonalεphase transformed from theγmatrix during SLM became significant after subsequent aging at moderate temperatures,which further increased the nanohardness and scratch *** temperature(1150℃)heating caused homogenized recrystallization microstructure free of residual stress andεphase,which sharply decreased the hardness and scratch *** material parallel to the building direction exhibited improved tribological property in both SLMed and aging-treated alloy than that of the material perpendicular to the building *** anisotropy in frictional performance may be co.sidered when designing co.rMo dental implants using laser additive manufacturing.

关键词： Selective laser melting co.rMo alloy Nanoindentation Nano-scratch test

P-E hysteresis loop going slim in Ba0.3Sr0.7TiO3-modified Bi0.5Na0.5TiO3 ceramics for energy storage applications

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Journal of advanced ceramics 2020年第2期9卷 183-192页

作者： Dongxu LI Zong-Yang SHEN Zhipeng LI Wenqin LUO Xingcai WANG Zhumei WANG Fusheng SONG Yueming LI Energy Storage and co.version ceramic Materials Engineering Laboratory of Jiangxi Province China National Light Industry Key Laboratory of Functional Ceramic MaterialsSchool of Materials Science and EngineeringJingdezhen Ceramic InstituteJingdezhen333000China Chengdu Hongke Electronic Technology co. Ltd.Chengdu610000China

(Ba0.3Sr0.7)x(Bi0.5Na0.5)1-xTiO3(BSxBNT,x=0.3–V0.8)ceramics were prepared to investigate their structure,dielectric and ferroelectric *** ceramics possess pure perovskite structure acco.panied from a tetragonal symmetry to pseudo-cubic one with the increase of x value,being co.firmed by X-ray diffraction(XRD)and Raman *** Tm co.responding to a temperature in the vicinity of maximum dielectric co.stant gradually decreases from 110℃(x=0.3)to-45℃(x=0.8),across Tm=36℃(x=0.5)with a maximum dielectric co.stant(ɛr=5920@1 kHz)around room *** saturated polarization Ps gradually while the remnant polarization Pr sharply decreases with the increase of x value,making the P-E hysteresis loop of BSxBNT ceramics goes slim.A maximum difference between Ps and Pr(Ps-Pr)is obtained for BSxBNT ceramics with x=0.5,at which a high reco.erable energy density(Wrec=1.04 J/cm3)is achieved under an applied electric field of 100 kV/cm with an efficiency ofη=77%.Meanwhile,the varied temperature P-E loops,fatigue measurements,and electric breakdown characteristics for the sample with x=0.5 indicate that it is promising for pulsed power energy storage capacitor candidate materials.

关键词： energy storage ceramics Ba0.3Sr0.7TiO3(BST) Bi0.5Na0.5TiO3(BNT) relaxor ferroelectrics pulsed power capacitor

DynamicMechanical and Chemorheology Analysis for the Blended Epoxy System with Polyurethane Modified Resin

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Journal of Renewable Materials 2022年第4期10卷 1081-1095页

作者： Xue Xin Yu Rong Linping Su Zhengmei Qiu Chenjun Yang Ming Liang Ping Ji Guoqiang Zhong Zhanyong Yao School of Qilu Transportation Shandong UniversityJinan250002China shandong Hi-Speed Group co. Ltd.Jinan250014China shandong Provincial co.munications Planning and Design institute Group co. Ltd.Jinan250031China

As the important matrix material,epoxy resin has been widely used in the co.posites for various *** acco.nt of the poor toughness of epoxy resin limiting their suitability for advanced applications,co.siderable interests have been co.ducted to modify the epoxy resin to meet the engineering *** this study,the bio-based polyurethane(PU)modified resin was adopted to modify the pure bisphenol-A epoxy by blending method with various *** to illuminate the curing behavior,mechanical and thermal properties,the blended epoxy systems were characterized by visco.ity-time analysis,dynamic mechanical analysis(DMA)at different frequencies and temperatures,mechanical tensile test,thermogravimetric analysis(TGA)and Fourier transform infrared(FT-IR)*** results indicated that the introduction of PU modified epoxy was found to significantly inhibit the visco.ity growth rates especially when the co.tent of PU modified epoxy resin is higher than 60%.Notwithstanding the dynamic modulus and T_(g)reduced with the increment of PU modified epoxy,remarkable increment on the elongation at break was found and the flexibility was greatly promoted with the introduction of PU modified *** proportion of PU modified epoxy in the blends should be put balance co.siderations to obtain optimal mechanical *** results and FTIR spectrum demonstrated that the addition of PU modified epoxy did not change the thermal deco.position mechanism and chemical reaction mechanism,but the addition of PU modified epoxy inhibits the curing reaction of epoxy resin by measured and calculated the damping temperature domainT from 35.7℃ to 48.9℃.

关键词： Dynamic mechanical property chemorheology analysis blended epoxy system polyurethane modified resin