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High-Quality van der Waals Epitaxial CsPbBr_(3)Film Grown on Monolayer Graphene Covered TiO_(2)for High-Performance Solar Cells

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Energy & Environmental materials 2024年第4期7卷 239-246页

作者： Zhaorui Wen Chao Liang Shengwen Li Gang Wang Bingchen He Hao Gu Junpeng Xie Hui Pan Zhenhuang Su Xingyu Gao Guo Hong Shi Chen Institute of Applied Physics and Materials Engineering University of MacaoMacao 999078China MOE Key Laboratory for Non-equilibrium Synthesis and Modulation of Condensed Matter State Key Laboratory for Mechanical Behavior of MaterialsSchool of PhysicsXi’an Jiaotong UniversityXi’an 710049China Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201204China Department of Materials Science and Engineering&Center of Super-Diamond and Advanced Films City University of Hong KongHong Kong 999077China

Two-dimensional materials have been widely used to tune the growth and energy-level alignment of ***,their incomplete passivation and chaotic usage amounts are not conducive to the preparation of highquality perovskite ***,we succeeded in obtaining higher-quality CsPbBr_(3)films by introducing large-area monolayer graphene as a stable physical overlay on top of TiO_(2)*** from the inert and atomic smooth graphene surface,the CsPbBr_(3)film grown on top by the van der Waal epitaxy has higher crystallinity,improved(100)orientation,and an average domain size of up to 1.22μ***,a strong downward band bending is observed at the graphene/perovskite interface,improving the electron extraction to the electron transport layers(ETL).As a result,perovskite film grown on graphene has lower photoluminescence(PL)intensity,shorter carrier lifetime,and fewer ***,a photovoltaic device based on epitaxy CsPbBr_(3)film is fabricated,exhibiting power conversion efficiency(PCE)of up to 10.64%and stability over 2000 h in the air.

关键词： all-inorganic perovskite solar cells buried interface modification monolayer graphene van der Waals epitaxial growth

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Ethylene glycol-regulated ammonium vanadate with stable layered structure and favorable interplanar spacing as high-performance cathode for aqueous zinc ion batteries

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Chinese Chemical Letters 2023年第8期34卷 508-512页

作者： Chao Lu Zhi Yang Yujie Wang Yun Zhang Hao Wu Yi Guo Wenlong Cai School of Mechanical Engineering Chengdu UniversityChengdu 610106China Department of Chemistry College of Resource and EnvironmentBaoshan UniversityBaoshan 678000China College of Materials Science and Engineering Sichuan UniversityChengdu 610064China College of Optoelectronic Engineering Chengdu University of Information TechnologyChengdu 610225China

Ammonium vanadate compounds featuring large capacity,superior rate capability and light weight are regarded as promising cathode materials for aqueous zinc ion batteries(AZIBs).However,the controllable synthesis of desired ammonium vanadates remains a ***,various ammonium vanadate compounds were successfully prepared by taking advantage of ethylene glycol(EG)regulated polyolreduction strategy and solvent effect via hydrothermal *** morphology and crystalline phase of resultant products show an evolution from dendritic(NH_(4))_(2)V_(6)O_(16)to rod-like NH_(4)V_(4)O_(10)and finally to lamellar(NH4)2V4O9 as increasing the amount of ***,the NH_(4)V_(4)O_(10)product exhibits a high initial capacity of 427.5 mAh/g at 0.1 A/g and stable cycling with a capacity retention of 90.4%after 5000 cycles at 10 A/*** relatively excellent electrochemical performances of NH_(4)V_(4)O_(10)can be ascribed to the stable open-framework layered structure,favorable(001)interplanar spacing,and peculiar rod-like morphology,which are beneficial to the highly reversible Zn^(2+)storage *** work offers a unique way for the rational design of high-performance cathode materials for AZIBs.

关键词： Ammonium vanadate rods Ethylene glycol reduction Zn^(2+)storage Cathode Aqueous zinc ion battery

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Investigation of the Effect of Blank Holding Force on Earing Defect During Circular Deep Drawing Process Through Finite Element Analysis and Experimentation Using AA6061 and Low-Carbon Steel Sheets 1

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12th International Conference and Workshop on Numerical Simulation of 3D Sheet Metal Forming Processes, NUMISHEET 2022

作者： Siraji, Amirela Bekele, Tsegaye Janaki Ramulu, Perumalla Beri, Habtamu Venkateswar Reddy, P. Department of Mechanical Engineering School of Mechanical Chemical and Materials Engineering Adama Science and Technology University Adama Ethiopia Department of Mechanical Engineering and Centre of Excellence for Advanced Manufacturing Engineering School of Mechanical Chemical and Materials Engineering Adama Science and Technology University Adama Ethiopia Department of Mechanical Engineering Vardhaman College of Engineering Telangana Kacharam Shamshabad Hyderabad501218 India

ISBN: (数字)9783031062124

ISBN: (纸本)9783031062117

Earing is defined as the formation of waviness on uppermost portion of deep drawn cup. It is one of the major defects observed during deep drawing process. The objective of the present study aims to investigate the influence of the blank holding force (BHF) on Earing defect in the deep drawing process of cylindrical cups through finite element analysis. For this purpose, mechanical properties of AA6061 and low-carbon steel sheets along with deep drawing tool design parameters were incorporated in the finite element modeling of deep drawing process. The finite element software (Pam-Stamp 2G) was utilized to carry out the numerical simulation of the deep drawing process. Different BHFs were applied during the deep drawing process. The simulation results showed that the best earing is observed when the BHF is 9kN for the AA6061 alloy and 20kN for the low-carbon steel sheet. The earing tendency and deep drawability of the low-carbon steel sheets is higher than AA6061. © 2022, The Minerals, Metals & materials Society.

关键词： Finite element method

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Self-Attenuating Graphene-Based Antennas Utilizing Polyvinylidene Fluoride (PVDF) Substrates

Self-Attenuating Graphene-Based Antennas Utilizing Polyvinyl...

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Microwave and Antenna Symposium (IMAS), International

作者： Josef Frankhouse Evans Addo-Mensah Uche Wejinya Department of Mechanical Engineering University of Arkansas - Fayetteville Materials Science and Engineering Graduate Program University of Arkansas - Fayetteville

ISBN: (数字)9798350356359

ISBN: (纸本)9798350356366

In this study, a Terahertz (THz) band antenna which can regulate its own resonant frequency without the requirement of manual adjustment is simulated. A polyvinylidene fluoride (PVDF) substrate is applied onto a rectangular graphene patch antenna. With a voltage potential applied onto the PVDF, the patch antenna can attenuate its frequency by physically changing the shape of the antenna, and in turn its resonant frequency. These antennas are within a 0.1 THz band between 1.32 THz to 1.22 THz measured from a radial bend of a flat surface to r = 75 μm, fitting into a return loss (S11) above -30 dB. Although the return loss did not show consistency, the resonating frequency shifted at a linear rate relative to the cylindrical bending.

关键词： Microwave antennas Patch antennas Graphene Resonant frequency Prototypes Bandwidth Bending Loss measurement Substrates Terahertz communications

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Improvement of corrosion resistance and heat dissipation of Mg-6%Al-4%Ca alloy by the addition of Mn, Mm, and the surface treatment

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Keikinzoku/Journal of Japan Institute of Light Metals 2023年第12期73卷 646-650页

作者： Ito, Mizuki Kondo, Natsuki Kirimoto, Yuichi Tsukeda, Tadayoshi Aida, Tetsuo Tabata, Hironobu Kurihara, Hideki Suzuki, Mayumi Program of Materials Science and Engineering Studies in Science and Engineering Graduate School of Science and Engineering University of Toyama 3190 Gofuku Toyama-shi Toyama930-8555 Japan School of Sustainable Design Materials and Engineering University of Toyama Toyama Toyama-shi Japan Department of Nano and Functional Material Science Graduate School of Science and Engineering for Education University of Toyama Toyama Toyama-shi Japan Faculty of Sustainable Design Academic Assembly University of Toyama Toyama Toyama-shi Japan CHUETSU METAL WORKS CO LTD.. Nakaniikawa-gun Toyama Japan Saitama Industrial Technology Center Kawaguchi-shi Saitama Japan Department of Mechanical Systems Engineering Faculty of Engineering Toyama Prefectural University Toyama Imizu-shi Japan

With the recent digitization, electronic equipment housings are required to be thin-walled and have rigidity, heat dissipation, corrosion resistance, and electromagnetic shielding properties. Magnesium alloys are promising materials that satisfy these requirements. Mg-Al alloys have good castability and high strength, but their thermal conductivity decreases. In general, adding alloying elements to magnesium decreases thermal conductivity the effect of aluminum addition is significant. It was found that adding calcium to Mg-Al alloys to form Mg-Al-Ca (AX) alloys results in higher thermal conductivity than that of Mg-Al alloys. However, AX alloys have poor corrosion resistance and require post-treatment such as surface treatment. In this study, AX64, which has high thermal conductivity among the AX series alloys, was used as the basic composition, and corrosion resistance was improved by adding manganese and misch metal, and an attempt was made to improve corrosion resistance and emissivity through surface treatment. The change in thermal conductivity by heat treatment was also investigated. Experimental results showed that the addition of manganese and misch metal improved corrosion resistance and thermal conductivity. Plasma anodization also improved corrosion resistance and emissivity. Heat treatment of these alloys at 400°C improved the thermal conductivity with longer holding time. © 2023 The Japan Institute of Light Metals.

关键词： Corrosion resistance

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Structural-functional unit ordering for high-performance electron-correlated materials

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Interdisciplinary materials 2023年第1期2卷 30-52页

作者： Guyang Peng Lei Hu Wanbo Qu Chenglong Zhang Shurong Li Ziyu Liu Juncheng Liu Shengwu Guo Yu Xiao Zhibin Gao Zhen Zhang Yang Zhang Haijun Wu Stephen J.Pennycook Jun Sun Xiangdong Ding State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong UniversityXi'anChina Instrumental Analysis Center Xi'an Jiaotong UniversityXi'anChina Department of Materials Science and Engineering University of TennesseeKnoxvilleTennesseeUSA

Electron-correlated materials have been drawing ever-increasing attention due to their fascinating physical behaviors and extensive application *** this review,a new method for material research and design(R&D),named structural-functional unit ordering(SFU ordering),which is presented,overcomes the shortcomings—for example,the limitation of finite chemical elements and long R&D circle-of conventional strategy and thus provides guidance for the design of these high-performance functional materials on ***,with the development of material characterization technologies,SFUs of different scales and types can be directly observed,which,moreover,regulate the corresponding *** review,starts with an introduction of the profile for SFU ordering and the synergistic effect between ***,studies on several new high-performance electronic-correlated materials,for example,a ferromagnetic semiconductor with local spin,ferromagnetic metals with spin topologies,ferroelectric thin films with polar topologies,piezoelectric thin films with nanopillars enclosed by charged boundaries,thermoelectric materials with local ferromagnetic nanoparticles and topotactic phase transformation with conducting nanofilaments are stated in detail one by *** vital aspect is the breaking of local symmetry,the construction,the structure,of SFUs and their orderings existing or theoretically existing,together with the enhanced/new *** in all,the main comments of the review tend to the remaining challenges,promising design approaches for the SFUs,and their orderings for high-performance functional materials.

关键词： electron-correlated materials ferroelectric piezoelectric structural-functional unit thermoelectric

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Leveraging language representation for materials exploration and discovery

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npj Computational materials 2024年第1期10卷 2622-2635页

作者： Jiaxing Qu Yuxuan Richard Xie Kamil M.Ciesielski Claire E.Porter Eric S.Toberer Elif Ertekin Department of Mechanical Science and Engineering University of Illinois at Urbana-ChampaignUrbanaIL 61801USA Beckman Institute for Advanced Science and Technology University of Illinois at Urbana-ChampaignUrbanaIL 61801USA Department of Physics Colorado School of MinesGoldenCO 80401USA Materials Research Laboratory University of Illinois at Urbana-ChampaignUrbanaIL 61802USA

Data-driven approaches to materials exploration and discovery are building momentum due to emerging advances in machine ***,parsimonious representations of crystals for navigating the vast materials search space remain *** address this limitation,we introduce a materials discovery framework that utilizes natural language embeddings from language models as representations of compositional and structural *** contextual knowledge encoded in these language representations conveys information about material properties and structures,enabling both similarity analysis to recall relevant candidates based on a query material and multi-task learning to share information across related *** this framework to thermoelectrics,we demonstrate diversified recommendations of prototype crystal structures and identify under-studied material *** through first-principles calculations and experiments confirms the potential of the recommended materials as high-performance ***-based frameworks offer versatile and adaptable embedding structures for effective materials exploration and discovery,applicable across diverse material systems.

关键词： contextual utilize versatile

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Characterization of Spicule Structure 152nd

Characterization of Spicule Structure

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152nd Annual Meeting and Exhibition of The Minerals, Metals and materials Society, TMS 2023

作者： Tavangarian, Fariborz Gray, Jennifer L. Clark, Trevor Gao, Chao Mechanical Engineering Program School of Science Engineering and Technology Pennsylvania State University Harrisburg MiddletownPA17057 United States Materials Research Institute The Pennsylvania State University University Park PA16802 United States Department of Mechanical and Industrial Engineering Norwegian University of Science and Technology Trondheim7034 Norway

ISBN: (纸本)9783031225239

Nature has been a great source of inspiration for engineers and scientists for centuries. It provides unique ideas to overcome the unmet needs of human beings. Spicules are structural elements of Euplectella Aspergillum sponges that reside in the deep ocean. They have an exceptional microstructure that provides excellent mechanical properties. Although spicules are composed of a brittle material, silica (SiO2), they behave differently under load compared to other ceramics. This behavior is due to their concentric cylindrical structure. To produce a similar structure with potential engineering and biomedical applications, one needs to investigate its microstructure in depth. In this study, we examined the microstructure of spicules to understand their architecture as a foundation to better design biomedical implants for tissue engineering applications. © 2023, The Minerals, Metals & materials Society.

关键词： Microstructure

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Sigma-Mixed Unscented Kalman Filter-Based Fault Detection for Traction Systems in High-Speed Trains

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Chinese Journal of Electronics 2023年第5期32卷 982-991页

作者： CHENG Chao WANG Weijun MENG Xiangxi SHAO Haidong CHEN Hongtian Department of Computer Science and Technology Changchun University of Technology Department of Mathematics and Statistics Changchun University of Technology Institute of System Research China Industrial Control Systems Cyber Emergency Response Team Department of Mechanical and Vehicle Engineering Hunan University Department of Chemical and Materials Engineering University of Alberta

Fault detection(FD) for traction systems is one of the active topics in the railway and academia because it is the initial step for the running reliability and safety of high-speed trains. Heterogeneity of data and complexity of systems have brought new challenges to the traditional FD methods. For addressing these challenges, this paper designs an FD algorithm based on the improved unscented Kalman filter(UKF) with consideration of performance degradation. It is derived by incorporating a degradation process into the state-space *** network topology of traction systems is taken into consideration for improving the performance of state estimation. We first obtain the mixture distribution by the mixture of sigma points in UKF. Then, the Lévy process with jump points is introduced to construct the degradation model. Finally, the moving average interstate standard deviation(MAISD) is designed for detecting *** the proposed methods via a traction systems in a certain type of trains obtains satisfactory results.

关键词： Degradation Network topology Fault detection Rail transportation State-space methods Safety Kalman filters

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Towards a new avenue for rapid synthesis of electrocatalytic electrodes via laser-induced hydrothermal reaction for water splitting

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International Journal of Extreme Manufacturing 2024年第1期6卷 340-351页

作者： Yang Sha Menghui Zhu Kun Huang Yang Zhang Francis Moissinac Zhizhou Zhang Dongxu Cheng Paul Mativenga Zhu Liu Department of Materials School of Natural SciencesThe University of ManchesterOxford RoadManchester M139PLUnited Kingdom Laser Processing Research Centre Department of MechanicalAerospace and Civil EngineeringSchool of EngineeringThe University of ManchesterOxford RoadManchester M139PLUnited Kingdom National Graphene Institute The University of ManchesterOxford RoadManchester M139PLUnited Kingdom Department of Chemical Engineering and Analytical Science School of EngineeringThe University of ManchesterOxford RoadManchester M139PLUnited Kingdom Research Centre for Laser Extreme Manufacturing Ningbo Institute of Materials Engineering and TechnologyChinese Academy of SciencesNingboPeople’s Republic of China

Electrochemical production of hydrogen from water requires the development ofelectrocatalysts that are active,stable,and low-cost for water *** address these challenges,researchers are increasingly exploring binder-free electrocatalytic integratedelectrodes (IEs) as an alternative to conventional powder-based electrode preparation methods,for the former is highly desirable to improve the catalytic activity and long-term stability for large-scale applications of ***,we demonstrate a laser-inducedhydrothermal reaction (LIHR) technique to grow NiMoO4nanosheets on nickel foam,which is then calcined under H2/Ar mixed gases to prepare the IE *** electrode exhibits superior hydrogen evolution reaction performance,requiring overpotentials of 59,116 and143 mV to achieve current densities of 100,500 and 1000 mA·*** the 350 h chronopotentiometry test at current densities of 100 and 500 m A·cm-2,the overpotentialremains essentially *** addition,NiFe-layered double hydroxide grown on Ni foam is also fabricated with the same LIHR method and coupled with IE-NiMo-IR to achieve water *** combination exhibits excellent durability under industrial current *** energy consumption and production efficiency of the LIHR method are systematicallycompared with the conventional hydrothermal *** LIHR method significantly improves the production rate by over 19 times,while consuming only 27.78%of the total energy required by conventional hydrothermal methods to achieve the same production.

关键词： electrocatalytic electrode laser-induced hydrothermal reaction NiFe layered double hydroxides hydrogen evolution reaction water splitting energy consumption production rate

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