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49th European Conference on Optical Communications, ECOC 2023

作者： Yokoyama, Shiyoshi Mao, Jiawei Uemura, Futa Sato, Hiromu Lu, Guo-Wei Institute for Materials Chemistry and Engineering Kyushu University Fukuoka816-8580 Japan Department of Molecular and Material Science Kyushu University Fukuoka816-8580 Japan

We demonstrate a high-speed MZI modulator that is based on a high electro-optic ferroelectric waveguide phase shifter on insulator. The device performs 140 Gbits/ OOK and 253 Gbit/s PAM4 data transmissions. © The... 详细信息

ISBN: (纸本)9781839539954

关键词： Ferroelectricity

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Ligand-rich oxygen evolution electrocatalysts reconstructed from metal-organic frameworks for anion-exchange membrane water electrolysis

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science Bulletin 2025年第12期70卷 1976-1985页

作者： Li, Shiqi Liu, Weiwei Shi, Yi Wang, Tang Liu, Tianyang Xue, Xiang Li, Rui Qiao, Man Wu, Zhen-Yu Zhang, Wang College of Materials Science and Engineering College of Environment Zhejiang University of Technology Hangzhou310014 China Department of Chemistry Institute of Innovative Material Guangdong Provincial Key Laboratory of Sustainable Biomimetic Materials and Green Energy Southern University of Science and Technology Shenzhen518055 China Jiangsu Co-Innovation Centre of Efficient Processing and Utilization of Forest Resources College of Chemical Engineering Nanjing Forestry University Nanjing210037 China Institute of Advanced Materials and Flexible Electronics School of Chemistry and Materials Science Nanjing University of Information Science & Technology Nanjing210044 China

Organic ligands in metal-organic frameworks (MOFs) play an indispensable role in the reconstruction and catalysis during the alkaline oxygen evolution reaction (OER). However, it is still a big challenge to maintain a high content of ligands in MOF-reconstructed OER electrocatalysts and to study the interaction between ligands and derived (oxy)hydroxides. Herein, a ligand-rich trimetallic amorphous electrocatalyst is fabricated through a two-step mechanochemical and electrochemical reconstruction strategy. Experimental and theoretical studies clearly reveal that the d-π interaction between delocalized π-electrons on the benzene ring of ligands and derived (oxy)hydroxides, can trigger the charge transfer from ligands to the active metal centers, thus optimizing the adsorption energy of the oxygen-containing intermediates and enhancing the OER performance. Moreover, an anion-exchange membrane water electrolyzer using such ligand-rich OER electrocatalyst can be operated steadily at 1.69 V and 55 °C under an industrial-level current density of 500 mA cm−2 for over 200 h. This work provides novel insights into the role of organic ligands in alkaline OER electrocatalysis, with the potential to facilitate the production of green hydrogen at industrial-level current densities. © 2025 science China Press

关键词： Electrolysis

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Understanding the formation chemistry of native solid electrolyte interphase over lithium anode and its implications using a LiTFSI/TME-TTE electrolyte and polysulfide additive

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Journal of materials Chemistry A 2023年第6期12卷 3659-3670页

作者： Olana, Bikila Nagasa Pan, Shih-Huang Hwang, Bing-Joe Althues, Holger Jiang, Jyh-Chiang Lin, Shawn D. Department of Chemical Engineering National Taiwan University of Science and Technology Taipei10617 Taiwan Hsinchu30076 Taiwan Sustainable Energy Development Center National Taiwan University of Science and Technology Taipei10617 Taiwan Fraunhofer-Institute for Material and Beam Technology IWS Winterbergstraße 28 Dresden01277 Germany

To develop high energy density Li batteries, Li metal anodes and in situ plated Li anodes (i.e., the so-called anode-free approach) have been extensively studied. However, the high reactivity of the Li metal surface can lead to chemical reactions with electrolyte components upon contact. Consequently, the so-called native solid electrolyte interphase (SEI) species are formed spontaneously when the Li anode is in contact with the electrolyte. This study illustrates the formation chemistry of native SEI over a Li metal surface using lithium bis(trifluoromethanesulfonyl)imide in tetramethylene sulfone and 1,1,2,2-tetrafluoroethyl-2,2,3,3-tetrafluoropropyl ether (LiTFSI/TMS-TTE) electrolyte with and without lithium polysulfide (PS) additive. All electrolyte components were found to decompose over the Li surface based on diffuse reflectance infrared Fourier-transformed spectroscopy (DRIFTS), X-ray photoelectron spectroscopy (XPS), and ab initio molecular dynamics (AIMD) simulation. The degradation mechanism and the evolved SEI species of each electrolyte component were carefully evaluated. The PS additive can significantly influence the composition of native SEI via its decomposition prior to all other electrolyte components, which can consequently suppress the degradation of the other electrolyte components, namely, TTE, TMS, and LiTFSI. The results indicate the importance of proper selection of electrolyte components, which can lead to the possibility of tuning such native SEI species to stabilize the Li surface in subsequent electrochemical cycling. © 2024 The Royal Society of Chemistry.

关键词： Additives

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Design and synthesis of a polymer for Cr(III) ions sensing

Design and synthesis of a polymer for Cr(III) ions sensing

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2022 IEEE International Conference on Emerging Electronics, ICEE 2022

作者： Thakur, Aman Chauhan, Vishakha Ramamurthy, Praveen C Indian Institute of Science Interdisciplinary Centre of Energy Research Bengaluru India Indian Institute of Science Department of Material Engineering Bengaluru India

ISBN: (纸本)9781665491853

A fluorene and amino-based conjugated polymer (PFluDNH2) was designed to selectively detect chromium (III) ions. The synthesis of the sensing polymer molecules was achieved in four steps which involved the formation of a diamino intermediate and the polymerization of this intermediate with a fluorene derivative. The structural elucidation of the synthesized molecules was performed using FTIR, 1H-NMR, 13C-NMR, and UV-Vis spectroscopic techniques. The cyclic-voltammetric experiments were performed to examine the electrochemical properties. Optical properties were studied by the photoluminescence (PL) technique. Synthesized PFluDNH2 displayed enhancement in fluorescence intensity upon selectively interacting with Cr (III) ions by showing chelation-enhanced fluorescent (CHEF) effect. The intensity increased after an excitation wavelength of 350 nm. The synthesized polymer showed good potential for metal ion detection and light-emitting devices. © 2022 IEEE.

关键词： Chelation

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Brittleness of metallic glasses dictated by their state at the fragile-to-strong transition temperature

arXiv

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arXiv 2024年

作者： Atila, Achraf Sukhomlinov, Sergey V. Honecker, Marc J. Müser, Martin H. Department of Material Science and Engineering Saarland University Saarbrücken66123 Germany

The effect of cooling on the brittleness of glasses in general, and bulk metallic glasses (BMGs) in particular, is usually studied with continuously varying cooling rates;slower cooling rates lead to stiffer, harder, and more brittle glasses than higher cooling rates. These protocols obscure any potential discontinuity that a glass might experience depending on whether its microstructure resembles that of a fragile or a strong glass-forming liquid. Here, we use large-scale molecular dynamics to simulate the nanoindentation behavior of model BMGs (Zr0.6Cu0.3Al0.1) obtained by rapidly quenching equilibrium melts from temperatures above and below the fragile-to-strong transition temperature Tfst, leading to fragile and strong glasses, respectively. While the contact modulus deduced from the indentation simulation evolves smoothly with the temperature Tq from which the melt is quenched, the plastic response changes quasi-discontinuously as Tq passes through Tfst. In particular, strong glasses develop highly asymmetric flow profiles with mature shear bands, in contrast to fragile glasses. Quantitative differences reveal themselves not only through a formal von Mises localization parameter analysis but also through image analysis of flow patterns using pre-trained artificial intelligence models. Moreover, seemingly erratic flow profiles for our indentation geometry produced surprisingly reproducible and, thus, deterministic features. It remains to be determined to what extent other classes of glass formers follow our observation that the degree of brittleness is significantly influenced by whether the melt is fragile or strong when it falls out of equilibrium at the glass transition temperature. © 2024, CC BY-NC-ND.

关键词： Metallic glass

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Cold self-lubrication of sliding ice

arXiv

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arXiv 2024年

作者： Atila, Achraf Sukhomlinov, Sergey V. Müser, Martin H. Department of Material Science and Engineering Saarland University Saarbrücken66123 Germany

The low kinetic friction between ice and numerous counterbodies is commonly attributed to an interfacial water layer, which is believed to originate from pre-existing surface water or from melt water induced by high contact pressures or frictional heat. However, even the currently leading theory of frictional melting appears to defy direct experimental verification. Here we present molecular simulations of ice interfaces that reveal that ice surfaces liquefy without melting thermodynamically but mostly by cold, displacement-driven amorphization, as implied in the idiom constant dripping wears the stone. In fact, the ratio of wear and shear rate for ice at -10◦C is even smaller than that of Niagara Falls averaged over one year. Despite efficient self-lubrication, small ice friction coefficients as observed during the sliding of hydrophobic solids over ice, appear possible only when the counterfaces are smooth and allow water to slip past them. © 2024, CC BY.

关键词： Ice

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Optimal Strain Gauge Placement on Testing Samples for Assessing the Effect of Residual Stress in Weld Fatigue

Optimal Strain Gauge Placement on Testing Samples for Assess...

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IEEE Conference on Industrial Electronics and Applications (ICIEA)

作者： Even Englund R.M. Chandima Ratnayake Department of Mechanical and Structural Engineering and Material Science University of Stavanger Stavanger Norway

ISBN: (数字)9798350360868

ISBN: (纸本)9798350360875

Strain gauges are frequently used for monitoring and for measure of the deformation or strain of a material under stress. They are widely used in fatigue degradation testing, which are methods to evaluate the performance and durability of structures and components under varying loads and cycles. They are also applied on small-scale test samples used for fatigue testing of welds where they are used in determination of hot spot stress that is found to give good reference stress approximations for the fatigue-loaded welded joints. The meticulous selection of optimal strain gauge placement on welded test samples is crucial for capturing the complicated impact of residual stresses. The careful consideration of sample preparation and extraction processes holds paramount significance, as it directly dictates the precision and reliability of the ensuing fatigue test results. This article highlights the significance of placement of strain gauges on test samples for fatigue testing of welds and for the determining residual stress release utilizing the sectioning method. The location of strain gauges should consider factors such as size of the test sample, thickness, weld bead profile, and potential stress concentrations. There have not been given any standard placement and guidelines for location of strain gauges on small-scale test samples or for measuring relies of residual stress applying the section method. Drawing upon a comprehensive literature survey of established principles and guidelines regarding strain gauge placement, this article focuses to offer instructive guidance on the judicious application of strain gauges in the examination of small-scale welded test samples. Furthermore, the paper aims to reveal best practices for employing strain gauges during the extraction process to ascertain the extent of residual stress relief.

关键词： Uncertainty Welding Spot welding Strain measurement Fatigue Residual stresses Testing

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Boron-doped high-entropy oxide toward high-rate and long-cycle layered cathodes for wide-temperature sodium-ion batteries

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Journal of Energy Chemistry 2024年第8期95卷 577-587,I0012页

作者： Yuzhen Dang Zhe Xu Yurong Wu Runguo Zheng Zhiyuan Wang Xiaopin Lin Yanguo Liu Zheng-Yao Li Kai Sun Dongfeng Chen Dan Wang School of Materials Science and Engineering Northeastern UniversityShenyang 110819LiaoningChina School of Resources and Materials Northeastern University at QinhuangdaoQinhuangdao 066004HebeiChina Key Laboratory of Dielectric and Electrolyte Functional Material Hebei Province Qinhuangdao 066004HebeiChina Neutron Scattering Laboratory Department of Nuclear PhysicsChina Institute of Atomic EnergyBeijing 102413China

03-type layered metal oxides hold great promise for sodium-ion batteries cathodes owing to their energy density ***,the severe irreversible phase transition and sluggish Na^(+)diffusion kinetics pose significant challenges to achieve high-performance layered ***,a boron-doped03-type high entropy oxide Na(Fe_(0.2)Co_(0.15)Cu_(0.05)Ni_(0.2)Mn_(0.2)Ti_(0.2))B_(0.02)O_(2)(NFCCNMT-B_(0.02))is designed and the covalent B-O bonds with high entropy configuration ensure a robust layered *** obtained cathode NFCCNMT-B_(0.02)exhibits impressive cycling performance(capacity retention of 95%and 82%after100 cycles and 300 cycles at 1 and 10 C,respectively)and outstanding rate capability(capacity of 83 mAh g^(-1)at 10 C).Furthermore,the NFCCNMT-B_(0.02)demonstrates a superior wide-temperature performance,maintaining the same capacity level(113,4 mAh g^(-1)@-20℃,121 mAh g^(-1)@25℃,and 119 mAh g^(-1)@60℃)and superior cycle stability(90%capacity retention after 100 cycles at 1 C at-20℃).The high-entropy configuration design with boron doping strategy contributes to the excellent sodium-ion storage *** high-entropy configuration design effectively suppresses irreversible phase transitions accompanied by small volume changes(ΔV=0.65 A3).B ions doping expands the Na layer distance and enlarges the P3 phase region,thereby enhancing Na^(+)diffusion *** work offers valuable insights into design of high-performance layered cathodes for sodium-ion batteries operating across a wide temperature.

关键词： High entropy oxide Born substitution Phase transition Na~+diffusion kinetics Sodium-ion batteries

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Fifth-Order A-WENO Path-Conservative Central-Upwind Scheme for Behavioral Non-Equilibrium Traffic Models

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Communications in Computational Physics 2023年第3期33卷 692-732页

作者： Shaoshuai Chu Alexander Kurganov Saeed Mohammadian Zuduo Zheng Department of Mathematics Southern University of Science and TechnologyShenzhen518055P.R.China Shenzhen International Center for Mathematics and Guangdong Provincial Key Laboratory of Computational Science and Material Design Southern University of Science and TechnologyShenzhen518055P.R.China School of Civil Engineering the University of QueenslandBrisbane Qld4072Australia.

Non-equilibrium hyperbolic traffic models can be derived as continuum approximations of car-following models and in many cases the resulting continuum models are *** leads to numerical difficulties,which seem to have discouraged further development of complex behavioral continuum models,which is a significant research *** this paper,we develop a robust numerical scheme that solves hyperbolic traffic flow models based on their non-conservative *** develop a fifth-order alternative weighted essentially non-oscillatory(A-WENO)finite-difference scheme based on the path-conservative central-upwind(PCCU)method for several non-equilibrium traffic flow *** order to treat the non-conservative product terms,we use a path-conservative *** this end,we first apply the recently proposed secondorder finite-volume PCCU scheme to the traffic flow models,and then extend this scheme to the fifth-order of accuracy via the finite-difference A-WENO *** designed schemes are applied to three different traffic flow models and tested on a number of challenging numerical *** schemes produce quite accurate results though the resolution achieved by the fifth-order A-WENO scheme is *** proposed scheme in this paper sets the stage for developing more robust and complex continuum traffic flow models with respect to human psychological factors.

关键词： Finite-difference A-WENO schemes finite-volume central-upwind schemes pathconservative central-upwind schemes non-oscillatory schemes continuum traffic flow model driver behavior.

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MAX phases: Opening new doorways with machinable ceramics

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American Ceramic Society Bulletin 2024年第3期103卷 64-64页

作者： Dujović, Miloš Department of Material Science and Engineering Texas A&M University College StationTX United States

Ceramics are traditionally viewed as brittle materials that can be diffi cult to machine. However, MAX phases, which garnered interest in the 1990s as a bridge between metals and ceramics, helped fundamentally shift these traditional views. MAX phases are a family of ternary carbides and nitrides with the general formula Mn+1AXn, where M refers to an early transition metal, A is an A-group element, and X is carbon or nitrogen.

关键词： Transition metals

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