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TiO_(2)@C catalyzed hydrogen storage performance of Mg-Ni-Y alloy with LPSO and ternary eutectic structure

Journal of Magnesium and Alloys 2024年第2期12卷 767-778页

作者： Wenjie Song Wenhao Ma Shuai He Wei Chen Jianghua Shen Dalin Sun Qiuming Wei Xuebin Yu College of Mechanical and Electrical Engineering Shaanxi University of Science and TechnologyXi’anShaanxi 710021China Department of Materials Science Fudan UniversityShanghai 200438China School of Aeronautics Northwestern Polytechnical UniversityXi’anShaanxi 710072China Department of Mechanical Engineering&Engineering Science the University of North Carolina at CharlotteCharlotteNorth Carolina 28223United States of America

A designed Mg_(88.7)Ni_(6.3)Y_(5)hydrogen storage alloy containing 14H type LPSO(long-period stacking ordered)and ternary eutectic structure was prepared by regulating the alloy composition and *** hydrogen storage performance of the alloy was improved by adding nano-flower-like TiO_(2)@C *** decomposition of the LPSO structure during hydrogenation led to the formation of plenty of nanocrystals which provided abundant interphase boundaries and activation *** nanoscale TiO_(2)@C catalyst was uniformly dispersed on the surface of alloy particles,and the"hydrogen overflow''effect of TiO_(2)@C accelerated the dissociation and diffusion of hydrogen on the surface of the alloy *** a result,the in-situ endogenous nanocrystals of the LPSO structure decomposition and the externally added flower-like TiO_(2)@C catalyst uniformly dispersed on the surface of the nanoparticles played a synergistic catalytic role in improving the hydrogen storage performance of the Mg-based *** the addition of the TiO_(2)@C catalyst,the beginning hydrogen desorption temperature was reduced to 200℃.Furthermore,the saturated hydrogen absorption capacity of the sample was 5.32 wt.%,and it reached 4.25 wt.%H_(2) in 1 min at 200℃and 30 bar.

关键词： Hydrogen storage Mg LPSO TiO_(2)@C Synergistic catalysis

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Giant phonon-skyrmion coupling in ferromagnet/heavy metal heterostructures

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Physical Review B 2024年第6期110卷 064423-064423页

作者： Egor Savostin Vitaliy Lomakin Program in Materials Science and Engineering Center for Memory and Recording Research Department of Electrical and Computer Engineering

The strong impact of the strain-induced Dzyaloshinskii-Moriya interaction (SIDMI) on the magnetization dynamics of skyrmions in nanomagnetic structures is demonstrated. The effects of SIDMI are characterized by skyrmion equations (SEs) of motion and magnetoelastic (ME) equations. The study is performed on a model system of MgO/CoFe/Pt stacked on a piezoelectric substrate. The results demonstrate a major nonlinear amplification in both the first- and higher-harmonic magnitudes of the skyrmion breathing mode due to SIDMI. Remarkably, this enhancement can trigger a skyrmion collapse, enabling its deletion with ultraweak strain-induced excitations. The SIDMI effect is shown to be much more significant than the conventional ME effect. These findings open different avenues for the efficient manipulation of nanomagnetic structures through strain.

关键词： Exchange interaction Magnetic interactions Magnetization dynamics Magnetoacoustic effect Micromagnetism Spin dynamics

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π-Extended giant dimeric acceptor as a third component enables highly efficient ternary organic solar cells with efficiency over 19.2%

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Journal of Energy Chemistry 2024年第8期95卷 263-270,I0006页

作者： Mengran Peng Haotian Wu Liming Wu Jianhua Chen Ruijie Ma Qunping Fan Hua Tan Weiguo Zhu Hongxiang Li Junqiao Ding School of Chemical Science and Technology Yunnan UniversityKunming 650500YunnanChina Department of Electrical and Electronic Engineering Research Institute for Smart Energy(RISE)Guangdong-Hong Kong-Macao(GHM)Joint Laboratory for Photonic-Thermal-Electrical Energy Materials and DevicesThe Hong Kong Polytechnic UniversityKowloonHong Kong 999077China State Key Laboratory for Mechanical Behavior of Materials Xi’an Jiaotong UniversityXi’an 710049ShaanxiChina School of Materials Science and Engineering Jiangsu Engineering Laboratory of Light-Electricity-Heat Energy-Converting Materials and ApplicationsChangzhou UniversityChangzhou 213164JiangsuChina College of Polymer Science and Engineering State Key Laboratory of Polymer Materials EngineeringSichuan UniversityChengdu 610065SichuanChina

Ternary strategy with a suitable third component is a successful strategy to improve the photovoltaic performance of organic solar cells(OSCs).Very recently,Y-series based giant molecule acceptors or oligomerized acceptors have emerged as promising materials for achieving highly efficient and stable binary OSCs,while application as third component for ternary OSCs is *** a novelπ-extended giant dimeric acceptor,GDF,is developed based on central Y series core fusion and rigid BDT as linker,and then incorporated into the state-of-the-art PM1:PC6 system to construct ternary *** GDF has a near planar backbone,resulting in increasedπ-conjugation,excellent crystallinity,and good electron transport *** GDF is introduced into the PM1:PC6 system,it ensues in a cascade like the lowest unoccupied molecular orbitals(LUMO)energy level alignment,a complementary absorption band with PM1 and PC6,higher and balanced hole and electron mobility,slightly smaller domain size,and a higher exciton dissociation probability for PM1:PC6:GDF(1:1.1:0.1)blend *** a consequence,the PM1:PC6:GDF(1:1.1:0.1)ternary OSC achieves a champion PCE of 19.22%,with a significantly higher open-circuit voltage and short-circuit current density,compared to 18.45%for the PM1:PC6(1:1.2)binary *** findings show that employing aπ-extended giant dimeric acceptor as a third component significantly improves the photovoltaic performance of ternary OSCs.

关键词： Giant dimeric acceptor Third component Ternary organic solar cells

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Computing grain boundary“phase”diagrams

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Interdisciplinary materials 2023年第1期2卷 137-160页

作者： Jian Luo Department of Nanoengineering Program of Materials Science and EngineeringUniversity of California San DiegoLa JollaCaliforniaUSA

Grain boundaries(GBs)can be treated as two-dimensional(2-D)interfacial phases(also called“complexions”)that can undergo interfacial phase-like *** bulk phase diagrams and calculation of phase diagram(CALPHAD)methods serve as a foundation for modern materials science,we propose to extend them to GBs to have equally significant *** perspective article reviews a series of studies to compute the GB counterparts to bulk phase ***,a phenomenological interfacial thermodynamic model was developed to construct GB lambda diagrams to forecast high-temperature GB disordering and related trends in sintering and other properties for both metallic and ceramic *** parallel,an Ising-type lattice statistical thermodynamic model was utilized to construct GB adsorption(segregation)diagrams,which predicted first-order GB adsorption transitions and critical *** two simplified thermodynamic models emphasize the GB structural(disordering)and chemical(adsorption)aspects,***,hybrid Monte Carlo and molecular dynamics atomistic simulations were used to compute more rigorous and accurate GB“phase”*** GB diagrams of thermodynamic and structural properties were further extended to include mechanical ***,machine learning algorithms were combined with atomistic simulations to predict GB properties as functions of four independent compositional variables and temperature in a 5-D space for a given GB in high-entropy alloys or as functions of five GB macroscopic(crystallographic)degrees of freedom plus temperature and composition for a binary alloy in a 7-D *** relevant studies are also *** perspective and outlook,including two emerging fields of high-entropy grain boundaries(HEGBs)and electrically(or electrochemically)induced GB transitions,are discussed.

关键词： CALPHAD grain boundary interfacial transition phase diagram

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Structure and electrical properties of polysilicon films doped with ammonium tetraborate tetrahydrate

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Journal of Semiconductors 2024年第10期45卷 60-68页

作者： Yehua Tang Yuchao Wang Chunlan Zhou Ke-Fan Wang Electrical and Energy Engineering Department Nantong Institute of TechnologyNantong 226000China Ningxia Research Center of Silicon Target and Silicon-Carbon Negative Materials Engineering Technology School of Materials Science and EngineeringNorth Minzu UniversityYinchuan 750021China Institute of Electrical Engineering Chinese Academy of SciencesBeijing 100049China School of Engineering Science University of Chinese Academy of SciencesBeijing 100049China Henan Key Laboratory of Quantum Materials and Quantum Energy School of Future TechnologyHenan UniversityKaifeng 475004China

Here,p-type polysilicon films are fabricated by ex-situ doping method with ammonium tetraborate tetrahydrate(ATT)as the boron source,named *** effects of ATT on the properties of polysilicon films are comprehensively *** Raman spectra reveal that the ATT-pPoly film is composed of grain boundary and crystalline *** preferred orientation is the(111)*** grain size increases from 16−23 nm to 21−47 nm,by~70%on *** with other reported films,Hall measurements reveal that the ATT-pPoly film has a higher carrier concentration(>10^(20)cm^(−3))and higher carrier mobility(>30 cm2/(V·s)).The superior properties of the ATT-pPoly film are attributed to the heavy doping and improved grain *** doping property is proved by the mean sheet resistance(Rsheet,m)and distribution *** R_(sheet,m)decreases by more than 30%,and it can be further decreased by 90%if the annealing temperature or duration is *** boron concentration of ATT-pPoly film annealed at 950℃ for 45 min is~3×10^(20)cm^(−3),and the distribution is nearly the same,except near the ***,the standard deviation coefficient(σ)of Rsheet,m is less than 5.0%,which verifies the excellent uniformity of ATT-pPoly film.

关键词： polysilicon film boron doping ammonium tetraborate tetrahydrate(ATT) electrical properties crystallization

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Flexible mica films coated by magnetron sputtered insulating layers for high-temperature capacitive energy storage

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SusMat 2024年第5期4卷 154-162页

作者： Chao Yin Tiandong Zhang Changhai Zhang Yue Zhang Chang Kyu Jeong Geon-Tae Hwang Qingguo Chi Key Laboratory of Engineering Dielectrics and its Application Ministry of EducationHarbin University of Science and TechnologyHarbinChina School of Electrical and Electronic Engineering Harbin University of Science and TechnologyHarbinChina Division of Advanced Materials Engineering Jeonbuk National UniversityJeonjuSouth Korea Department of Materials Science and Engineering Pukyong National UniversityBusanSouth Korea

High-temperature energy storage performance of dielectric capacitors is cru-cial for the next generation of power electronic ***,conduction losses rise sharply at elevated temperature,limiting the application of energy storage ***,the mica films magnetron sputtered by different insulating layers are specifically investigated,which exhibit the excellent high-temperature energy storage *** experimental results revealed that the PbZrO3/Al2O3/PbZrO3(PZO/AO/PZO)interface insulating layers can effec-tively reduce the high-temperature leakage current and conduction loss of the composite ***,the ultrahigh energy storage density(Wrec)and charge‒discharge efficiency(η)can be achieved simultaneously in the flexi-ble mica-based composite ***,PZO/AO/PZO/mica/PZO/AO/PZO(PAPMPAP)films possess excellent Wrec of 27.5 J/cm3 andηof 87.8%at 200◦C,which are significantly better than currently reported high-temperature capaci-tive energy storage dielectric *** with outstanding power density and electrical cycling stability,the flexible films in this work have great appli-cation potential in high-temperature energy storage ***,the magnetron sputtering technology can deposit large-area nanoscale insulating layers on the surface of capacitor films,which can provide technical support for the industrial production of capacitors.

关键词： energy storage high temperature insulating layer magnetron sputtering mica

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Multiplex Immunoassays Enabled by Pixelated High-Quality Factor Metasurfaces and Acoustic Bioprinting

Multiplex Immunoassays Enabled by Pixelated High-Quality Fac...

引用

CLEO: Fundamental science, CLEO:FS 2024 - Part of Conference on Lasers and Electro-Optics, CLEO 2024

作者： Abdollahramezani, Sajjad Safir, Fareeha Moradifar, Parivash Dagli, Sahil Dolia, Varun Hu, Jack Delgado, Hamish Carr Chang, Kai Khuri-Yakub, Butrus T. Dionne, Jennifer Department of Materials Science and Engineering Stanford University United States Department of Electrical Engineering Stanford University United States

ISBN: (纸本)9781957171395

We demonstrate a compact multiplex immunoassay platform by leveraging ultra-densely-pixelated high-quality factor metasurfaces, acoustic bioprinting of surface chemistry, and hyperspectral imaging for the rapid detection of multiple proteins with high sensitivity and specificity. © 2024 The Author(s) © Optica Publishing Group 2024.

关键词： Hyperspectral imaging

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Recent applications in dielectric barrier discharge and radio frequency plasmas‐engineered transition metal electrocatalysts for water splitting

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High Voltage 2023年第6期8卷 1115-1131页

作者： Guangliang Chen Bin He Yuxin Wang Pengchen He Liguang Dou Renwu Zhou Dongliang Chen Tao Shao Department of Materials Engineering Huzhou UniversityHuzhouChina School of Materials Science and Engineering Zhejiang Sci‐Tech UniversityHangzhouChina Beijing International S&T Cooperation Base for Plasma Science and Energy Conversion Institute of Electrical EngineeringChinese Academy of SciencesBeijingChina State Key Laboratory of Electrical Insulation and Power Equipment Centre for Plasma BiomedicineXi'an Jiaotong UniversityXi'anChina State Key Laboratory of Silicon and Advanced Semiconductor Materials School of Materials Science and EngineeringZhejiang UniversityHangzhouChina

Hydrogen generated by water electrolysis is considered as one of the most promising protocols to partly replace the roles of traditional fossil ***,high‐performance electrocatalyst satisfied with the industrial requirement still faces significant ***‐temperature plasma contains numerous high‐energy ions,electrons and other reactive species,which can provide a highly reactive environment for tuning the physio‐chemical structures of catalysts through plasma milling,etching,doping and/or *** is well‐known that high‐temperature micro‐filaments contained in plasmas can cause some special modifications of the catalyst surface,thus effectively adjusting the physio‐chemical structure of latterly engineered ***,low‐temperature plasma technologies,especially the dielectric barrier discharge(DBD)and radio frequency(RF)plasmas,can be considered as a green and sustainable strategy for engineering high‐performance electrocatalysts for water splitting(hydrogen evolution reaction[HER];oxygen evolution reaction[OER]).Herein,recent progress of DBD and RF plasmas for fabricating and modifying transition metal‐based electrocatalysts(***,phos-phide,selenide,oxide,hydroxide)for hydrogen evolution reaction or OER is compre-hensively reviewed,and the role of plasma is also discussed.

关键词： splitting dielectric transition

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Light-Material Interactions Using Laser and Flash Sources for Energy Conversion and Storage Applications

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Nano-Micro Letters 2024年第12期16卷 468-514页

作者： Jung Hwan Park Srinivas Pattipaka Geon-Tae Hwang Minok Park Yu Mi Woo Young Bin Kim Han Eol Lee Chang Kyu Jeong Tiandong Zhang Yuho Min Kwi-Il Park Keon Jae Lee Jungho Ryu Department of Mechanical Engineering(Department of Aeronautics Mechanical and Electronic Convergence Engineering)Kumoh National Institute of Technology61Daehak-RoGumiGyeongbuk 39177Republic of Korea Department of Materials Science and Engineering Pukyong National University45Yongso-RoNam-GuBusan 48513Republic of Korea Energy Technologies Area Lawrence Berkeley National LaboratoryBerkeleyCA 94720USA Department of Materials Science and Engineering Korea Advanced Institute of Science and Technology(KAIST)291 Daehak-RoYuseong-GuDaejeon 34141Republic of Korea Division of Advanced Materials Engineering Jeonbuk National UniversityJeonju 54896JeonbukRepublic of Korea School of Electrical and Electronic Engineering Harbin University of Science and TechnologyHarbin 150080People’s Republic of China Key Laboratory of Engineering Dielectrics and Its Application Ministry of EducationHarbin University of Science and TechnologyHarbin 150080People’s Republic of China Department of Materials Science and Metallurgical Engineering Kyungpook National University80 Daehak-RoBuk-GuDaegu 41566Republic of Korea School of Materials Science and Engineering Yeungnam UniversityDaehak-RoGyeongsan-Si 38541Gyeongsangbuk-doRepublic of Korea

This review provides a comprehensive overview of the progress in light-material interactions(LMIs),focusing on lasers and flash lights for energy conversion and storage *** discuss intricate LMI parameters such as light sources,interaction time,and fluence to elucidate their importance in material *** addition,this study covers various light-induced photothermal and photochemical processes ranging from melting,crystallization,and ablation to doping and synthesis,which are essential for developing energy materials and ***,we present extensive energy conversion and storage applications demonstrated by LMI technologies,including energy harvesters,sensors,capacitors,and *** the several challenges associated with LMIs,such as complex mechanisms,and high-degrees of freedom,we believe that substantial contributions and potential for the commercialization of future energy systems can be achieved by advancing optical technologies through comprehensive academic research and multidisciplinary collaborations.

关键词： Light Light-material interaction Nanomaterials Energy conversion and storage devices

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Speech Recognition for Intelligent System in Service Robots: A Review 4

Speech Recognition for Intelligent System in Service Robots:...

引用

4th International Conference on electrical engineering and Computer science, ICECOS 2024

作者： Atika, Ratna Dwijayanti, Suci Yudho Suprapto, Bhakti Doctoral Program in Engineering Science Universitas Sriwijaya Department of Electrical Engineering Polytechnic of Sriwijaya Palembang Indonesia Faculty of Engineering Universitas Sriwijaya Department of Electrical Engineering Palembang Indonesia Faculty of Engineering Palembang Universitas Department of Electrical Engineering Sriwijaya Indonesia

ISBN: (纸本)9798350368253

Speech recognition and response system technology in service robot research continues to evolve alongside technical advances and the increasing demand for intelligent automation across industries. The development of machine learning, digital signal processing, and artificial neural networks has brought significant advancements to speech recognition systems. While speech recognition has been implemented in various systems, there is limited discussion on categorizing these systems by examining four aspects: speech recognition applications, datasets used, emotional speech recognition, and automatic speech recognition. In this study, a review of these four aspects is conducted, focusing on the algorithms and methods used, along with their advantages and disadvantages, particularly in the context of implementing them in service robots using the Indonesian language. This study involves a literature review of 100 research papers from the last five years. The review concludes that the use of the transformer method combined with other techniques and Indonesian language datasets is still very limited. Therefore, future research will focus on developing and implementing these methods in humanoid service robots. © 2024 IEEE.

关键词： Intelligent systems

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