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Polarizable Additive with Intermediate Chelation Strength for Stable Aqueous Zinc‑Ion Batteries

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Nano-Micro Letters 2024年第5期16卷 41-55页

作者： Yuting Xia Rongao Tong Jingxi Zhang Mingjie Xu Gang Shao Hailong Wang Yanhao Dong Chang‑An Wang State Key Lab of New ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing 100084People’s Republic of China School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450001HenanPeople’s Republic of China

Aqueous zinc-ion batteries are promising due to inherent safety,low cost,low toxicity,and high volumetric ***,issues of dendrites and side reactions between zinc metal anode and the electrolyte need to be solved for extended storage and cycle ***,we proposed that an electrolyte additive with an intermediate chelation strength of zinc ion—strong enough to exclude water molecules from the zinc metal-electrolyte interface and not too strong to cause a significant energy barrier for zinc ion dissociation—can benefit the electrochemical stability by suppressing hydrogen evolution reaction,overpotential growth,and den-drite ***-sodium diethylene-triaminepentaacetic acid salt was selected for such a *** has a suitable chelating ability in aqueous solutions to adjust solvation sheath and can be readily polarized under electrical loading conditions to further improve the ***||Zn symmetric cells can be stably operated over 3500 h at 1 mA cm^(-2).Zn||NH4V4O10 full cells with the additive show great cycling stability with 84.6%capacity retention after 500 cycles at 1 A g^(-1).Since the additive not only reduces H2 evolution and corrosion but also modifies Zn2+diffusion and deposition,highlyreversible Zn electrodes can be achieved as verified by the experimental *** work offers a practical approach to the logical design of reliable electrolytes for high-performance aqueous batteries.

关键词： Aqueous zinc-ion batteries Electrolyte additives DTPA-Na Chelation strength

Recent progresses in the phenomenological description for the indentation size effect in microhardness testing of brittle ceramics

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Journal of advanced ceramics 2012年第1期1卷 38-49页

作者： Danyu JIANG State Key laboratory of High Performance ceramics and Superfine Microstructure Shanghai Institute of CeramicsShanghai 200050China

The indentation hardness of a given material is usually load-dependent and such a phenomenon is generally referred to as the indentation size effect(ISE).The existence of ISE means that,if hardness is used as a material selection criterion,it is clearly insufficient to quote a single hardness *** empirical or semi-empirical equations,including the Meyer’s law,the Hays-Kendall approach,the energy-balance approach,the proportional specimen resistance(PSR)model and the modified PSR model,etc.,have been proposed for the description of the variation of the indentation size with the applied test load and for determining the so-called load-independent *** paper reviews these existing empirical equations,with a special emphasis on the analysis and the application of the modified PSR model.

关键词： indentation hardness size effect residual stress

Comprehensive optimization of piezoelectric coefficient and depolarization temperature in Mn-doped Bi_(0.5)Na_(0.5)TiO_(3)-Bi_(0.5)K_(0.5)TiO_(3)-BaTiO_(3)lead-free piezoceramics

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Journal of Materials Science & Technology 2024年第5期172卷 255-263页

作者： Huashan Zheng Enwei Sun Huajie Luo Xiaoyu Zhang Yixiao Yang Bin Yang Rui Zhang Shantao Zhang Wenwu Cao Condensed Matter Science and Technology Institute School of Instrumentation Science and EngineeringHarbin Institute of TechnologyHarbin150080China advanced Innovation Center for Materials Genome Engineering University of Science and Technology BeijingBeijing100083China National laboratory of Solid State Microstructures Department of Materials Science and EngineeringCollege of Engineering and Applied Science&Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing210093China Department of Mathematics and Materials Research Institute The Pennsylvania State UniversityUniversity ParkPennsylvania16802United States of America

Lead-free Bi_(_(0.5))Na_(_(0.5))TiO_(3)(BNT)piezoelectric ceramics have the advantages of large coercive fields and high Curie *** the improvement of piezoelectric coefficient(d 33)is usually accompanied by a huge sacrifice of depolarization temperature(T d).In this work,a well-balanced performance of d 33 and T d is achieved in MnO_(2)-doped 0.79(Bi_(_(0.5))Na_(_(0.5))TiO_(3))-0.14(Bi_(0.5)K_(0.5)TiO_(3))-0.07BaTiO_(3)ternary *** in-corporation of 0.25 mol%MnO_(2)enhances the d 33 by more than 40%,while T d remains almost unchanged(i.e.,d 33=181 pC/N,T d=184℃).X-ray diffraction(XRD)shows that an appropriate fraction of the small axis-ratio ferroelectric phase(pseudo-cubic,P c)coexists with the long-range ferroelectric phase(tetrag-onal,T)under this MnO_(2)*** force microscopy(PFM)has revealed a special domain configuration,namely large striped and layered macro domains embedded with small *** study provides a distinctive avenue to design BNT-based piezoelectric ceramics with high piezoelectric performance and temperature stability.

关键词： BNT-BKT-BT ceramics Mn doping Piezoelectric Depolarization temperature Phase structure

Recent development of A_2B_2O_7 system transparent ceramics

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Journal of advanced ceramics 2018年第4期7卷 289-306页

作者： Zhengjuan WANG Guohong ZHOU Danyu JIANG Shiwei WANG State Key laboratory of High Performance ceramics and Superfine Microstructure Shanghai Institute of Ceramics Chinese Academy of Sciences Key laboratory of Transparent Opto-functional Inorganic Materials Shanghai Institute of Ceramics Chinese Academy of Sciences

A_2B_2O_7 system compounds, which usually present three phase structures mainly based on the ionic radius ratios of r_A and r_B(r_A/r_B), have been studied for potential applications in many fields, such as thermal barrier coatings, luminescence powders, fast-ion conductors, photocatalysts, and matrices for immobilization of highly active radionuclides. Since 2005, La_2Hf_2O_7 was fabricated into transparent ceramics and much more attentions were paid on A_2B_2O_7 transparent ceramics for new applications. In this review, the development of A_2B_2O_7 system transparent ceramics was described. The structure characteristics, powder synthesis method, and sintering techniques of the final A_2B_2O_7 transparent ceramics were summarized. After that, the mostly reported A_2Hf_2O_7, A_2Zr_2O_7, and A_2Ti_2O_7 system transparent ceramics were systematically introduced. The potential application fields and future development trends were also discussed, focusing on scintillators, optical elements, and other luminescent materials.

关键词： A2B2O7 system transparent ceramics powder synthesis sintering potential applications

Effect of Y2O3, CeO2 on Sintering Properties of Si3N4 ceramics

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Journal of Rare Earths 2003年第3期21卷 357-359+299页

作者：苏盛彪包亦望王黎李竟先 South China University of Science and Technology Beijing 100024 China Guangzhou 510641 China Building Material Academy Department of Materials Science Key laboratory for advanced ceramics

The effect of rare earth oxides Y 2O 3 or CeO 2 on sintering properties of Si 3N 4 ceramics was studied and the mechanism of assisting action during sintering was analyzed. The results indicate that the best sintering properties appear in Si 3N 4 ceramics with 5% Y 2O 3 or 8% CeO 2. Secondary crystallites are formed at grain boundaries after heat treatment, which decreases the amount of glass phase and contributes to the improvement of high temperature mechanical properties of silicon nitride.

关键词： additive Si 3N 4 ceramics sintering properties rare earths

Microstructural evolution of h-BN matrix composite ceramics with La-Al-Si-O glass phase during hot-pressed sintering

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Journal of advanced ceramics 2021年第3期10卷 493-501页

作者： Baofu QIU Xiaoming DUAN Zhuo ZHANG Chen ZHAO Bo NIU Peigang HE Delong CAI Lei CHEN Zhihua YANG Yujin WANG Dechang JIA Yu ZHOU Key laboratory of advanced Structural-Functional Integration Materials&Green Manufacturing Technology Harbin Institute of TechnologyHarbin 150001China Institute for advanced ceramics School of Materials Science and EngineeringHarbin Institute of TechnologyHarbin 150001China State Key laboratory of advanced Welding and Joining Harbin Institute of TechnologyHarbin 150001China

BN/La-Al-Si-O composite ceramics were fabricated by hot-pressed sintering using hexagonal boron nitride(h-BN),lanthanum oxide(La_(2)O_(3)),aluminia(Al_(2)O_(3)),and amorphous silica(SiO_(2))as the raw *** effects of sintering temperature on microstructural evolution,bulk density,apparent porosity,and mechanical properties of the h-BN composite ceramics were *** results indicated that La-Al-Si-O liquid phase was formed during sintering process,which provided an environment for the growth of h-BN *** increasing sintering temperature,the cristobalite phase precipitation and h-BN grain growth occurred at the same time,which had a significant influence on the densification and mechanical properties of h-BN composite *** best mechanical properties of BN/La-Al-Si-O composite ceramics were obtained under the sintering temperature of 1700℃.The elastic modulus,flexural strength,and fracture toughness were 80.5 GPa,266.4 MPa,and 3.25 MPa·m^(1/2),respectively.

关键词： h-BN matrix composite ceramics La-A1-Si-O glass phase microstructural evolution nanocrystalline precipitation mechanical properties

Effects of Zr and chopped C fiber on microstructure and mechanical properties of SiBCN ceramics

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Science China(Technological Sciences) 2020年第8期63卷 1520-1530页

作者： ZHU QiShuai WANG GaoYuan LIAO XingQi LI DaXin YANG ZhiHua JIA DeChang DUAN XiaoMing HE PeiGang ZHOU Yu Institute for advanced ceramics School of Materials Science and EngineeringHarbin Institute of TechnologyHarbin 150080China Key laboratory of advanced Structure-Function Integrated Materials and Green Manufacturing Technology Ministry of Industry and Information TechnologyHarbin 150080China State Key laboratory of advanced Welding and Joining Harbin Institute of TechnologyHarbin 150080China

To further improve the thermal shock resistance and ablation resistance of SiBCN system ceramics targeted much harsh environment,both ultra-high temperature ceramic phases and carbon fibers are expected to be incorporated simultaneously as the ***,tough problems like difficulty in densification as well as degradation of C fibers(Cf)due to interfacial reaction usually cannot be ***,in this study,Zr as well as chopped Cf with BN coating were introduced into SiBCN ceramics by mechanical alloying and after hot-pressing sintering to prepare Cf/SiBCNZr *** structure and phase component development have been characterized in detail by XRD,SEM,TEM and XPS etc.,and mechanical properties,fracture behavior and toughening mechanisms were also ***-B and Zr-O bonds are detected besides Si-C,N-B and N-B-C bonds when pre-alloyed ZrB2 amorphous powder was incorporated into SiBCN system by further mechanical-alloying *** hot-pressing,the ultra-high temperature phases of ZrB2 and ZrN were formed as expected besides the original matrix phases of BN(C)and *** mechanical properties can be obtained for SiBCNZr *** BN coating on carbon fibers successfully avoids the severe fiber degradation and makes it possible for moderating strong interface bonding,which ensuring the debonding,crack deflection,fiber pulling-out and bridging during the *** a result,the Cf/SiBCNZr composites retain good mechanical properties and fractures in a pseudoplastic fracture manner,showing better potential applications in harsh *** of the BN coating on Cf and Zr incorporation by pre-mechanical alloying can be a good route to achieve Cf/SiBCNZr composites with a better balance between thermal shock resistance,ablation resistance and mechanical properties.

关键词： SiBCN ZrB2 ZrN carbon fiber BN coating chemical bond microstructure mechanical properties fracture toughening

Microstructural evolution and mechanical properties of h-BN composite ceramics with Y2O3-AlN addition by liquid-phase sintering

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Rare Metals 2020年第5期39卷 555-561页

作者： Bao-Fu Qiu Xiao-Ming Duan Zhuo Zhang Xing-Qi Liao Zhi-Hua Yang De-Long Cai De-Chang Jia Yu Zhou Key laboratory of advanced Structural-Functional Integration Materials&Green Manufacturing Technology Harbin Institute of TechnologyHarbin 150001China Institute for advanced ceramics School of Materials Science and EngineeringHarbin Institute of TechnologyHarbin 150001China State Key laboratory of advanced Welding and Joining Harbin Institute of TechnologyHarbin 150001China

Hexagonal boron nitride(h-BN)composite ceramics were prepared by hot pressing with the addition of Y2O3 and *** effects of different Y2O3–AlN contents on microstructural evolution,mechanical properties and thermal diffusion coefficients of h-BN composite ceramics were *** results indicate that Y2O3–AlN forms a liquid phase during the sintering process achieving a good wettability with h-BN *** pure h-BN ceramic and h-BN composite ceramic with 40 wt%Y2O3–AlN,the h-BN grains grow well when controlled through solid-phase and liquid-phase diffusion,*** the increase in Y2O3–AlN content,mechanical properties and thermal diffusion coefficients of h-BN composite ceramics first decrease and then increase,and the properties of h-BN composite ceramic with 10 wt%Y2O3–AlN are the inflection *** properties are highly related to the phase compositions,porosity and microstructure.

关键词： Hexagonal boron nitride Y2O3–AlN Liquidphase sintering Wettability Mechanical properties

Single-atom alloys prepared by two-step thermal evaporation

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Nano Research 2024年第4期17卷 2808-2813页

作者： Honglin Wang Jing Li Meirong Huang Jizhe Cui Zhiying Cheng Rong Yu Hongwei Zhu State Key Lab of New ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China State Key Lab of Solid Waste Reuse for Building Materials Beijing Building Materials Academy of Science ResearchBeijing 100041China

Single-atom alloys(SAAs)have gained significant attention due to their remarkable atomic utilization efficiency,interactions between single atoms(SAs)and metal supports,and free-atom-like electronic structure of dopant *** this work,we observed the formation of SAs in pre-deposited metal particles by a two-step thermal evaporation technique,thereby establishing the first instance of discovering SAAs by thermal *** discovery of SAAs by thermal evaporation extends the range of SAAs preparation methods to include this traditional synthetic technique,which offers convenience,cost-efficiency,and *** formation mechanism of SAAs prepared using this technique was elucidated by density functional theory *** was demonstrated that thermal evaporation can be utilized to prepare SAAs with multiple SAs,further highlighting its universal applicability.

关键词： single-atom alloys thermal evaporation density functional theory