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Achieving high carrier mobility and low lattice thermal conductivity in GeTe-based alloys by cationic/anionic co-doping

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rare Metals 2024年第6期43卷 2784-2795页

作者： Xiao-Qiang Wang Xiao-Quan Hu Jun-Yan lin Chu-Bin li Xiao-Tong yu Qi-Yong Chen li-li Xi Qi-Shuo Yang Han li Ji-Ye Zhang Shuan-Kui li Kai Guo School of physics and Materials Science Guangzhou UniversityGuangzhou 510006China research Center for Advanced Information Materials(CAIM) Huangpu Research&Graduate School of Guangzhou UniversitySino-Singapore Guangzhou Knowledge CityGuangzhou510555China School of Materials Science and Engineering Shanghai UniversityShanghai 200444China Materials Genome institute Shanghai UniversityShanghai 200444China School of Mechanical and Mining Engineering University of QueenslandBrisbaneQLD 4072Australia Key Laboratory of Si-Based Information Materials&Devices and Integrated Circuits Design Department of Education of Guangdong ProvinceGuangzhou 510006China

TheⅣ-Ⅵcompound GeTe is considered as a promising alternative to the toxic pbTe for high-efficiency mid-temp.r.ture thermoelectric ***,pristine GeTe suffers from a high concentration of Ge vacancies,resulting in an excessively high hole concentration(>1×10^(21)cm^(-3)),which greatly limits its thermoelectric *** address this issue,CuBiTe_(2)alloying is introduced to increase the formation energy of Ge vacancies in GeTe,thereby inhibiting the high carrier *** carrier scattering caused by the electronegativity difference between different elements is sup.r.ssed due to the similar electronegativity of Cu and Ge atoms.A relatively high hole mobility is obtained,which ultimately leads to a high power ***,by introducing Se as an alloying element at the anionic site in GeTe,dense point defects with mass/strainfield fluctuations are *** contributes to the strengthening of phonon scattering,thereby reducing the lattice thermal conductivity from 1.44 W·m^(-1)·K^(-1)for pristine GeTe to 0.28 W·m^(-1)·K^(-1)for Ge_(0.95)Cu_(0.05)Bi_(0.05)Te_(0.9)Se_(0.15)compound at 623 K.

关键词： GeTe Carrier mobility CuBiTe_(2)alloying Lattice thermal conductivity Thermoelectric prop.r.ies

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physical Simulation of Small-bore Copp.r.vap.r. Laser

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Chinese Journal of Lasers 1999年第1期8卷 22-29页

作者： yu Deli TAO Yongxiang YIN Xianhua WANG runwen CHEN lin YANG Yan li Hailan (shanghai institute of Optics and Fine Mechanics, The Chinese Academy of Sciences, shanghai 201800, china) 中科院上海光学精密机械所上海

１ＩｎｔｒｏｄｕｃｔｉｏｎＩｎｒｅｃｅｎｔｙｅａｒｓｔｈｅｃｏｐｐｅｒｖａｐｏｒｌａｓｅｒ（ＣＶＬ）ｈａｓｂｅｅｎｄｅｖｅｌｏｐｅｄｒａｐｉｄｌｙ，ａｍａｒｋｅｄａｃｈｉｅｖｅｍｅｎｔｈａｓｂｅｅｎｏｂｔａｉｎｅｄ... 详细信息

１ＩｎｔｒｏｄｕｃｔｉｏｎＩｎｒｅｃｅｎｔｙｅａｒｓｔｈｅｃｏｐｐｅｒｖａｐｏｒｌａｓｅｒ（ＣＶＬ）ｈａｓｂｅｅｎｄｅｖｅｌｏｐｅｄｒａｐｉｄｌｙ，ａｍａｒｋｅｄａｃｈｉｅｖｅｍｅｎｔｈａｓｂｅｅｎｏｂｔａｉｎｅｄｏｎｉｔｓｔｈｅｏｒｉｅｓａｎｄｄ...

关键词： Copp.r.vap.r.laser (CVL) kinetic model computer simulation thermal analysis

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prep.r.tion and characterization of pZT thick film enhanced by ZnO nanowhiskers for MEMS piezoelectric generators

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progress in Natural Science:Materials International 2011年第02期21卷 159-163页

作者： Zhong-xia DUAN~1,Guo-qin yu~2,Jun-biao liU~1,Jun liU~2,Xiao-wen DONG~2,li HAN~1,peng-yun JIN~1 1.institute of electrical Engineering,Chinese Academy of Sciences,Beijing 100190,china 2.shanghai Municipal electric power Company,shanghai 200025,china [a] institute of electrical Engineering Chinese Academy of Sciences Beijing 100190 China [b] shanghai Municipal electric power Company Shanghai 200025 China

A hybrid sol-gel route which was used to fabricate pZT thick film for MEMS piezoelectric generators was investigated. （100）-oriented pb(Zr0.52Ti0.48)O3thick films enhanced by ZnO nanowhiskers（ZnOw） were successfully prep.r.d on pt/Cr/SiO2/Si substrates via spin-coating ZnOwsuspension and pZT *** influences of film thickness on the microstructure and electrical prop.r.ies of composite thick film were *** results show that pZT composite thick films have（100）-oriented p.r.vskite *** results show that,the surface of as-prep.r.d（100）-oriented pZT piezoelectric composite thick film is smooth,compact and crack-free,and the cross section is *** composite thick films exhibit good ferroelectric,dielectric and piezoelectric prop.r.ies.2 urn-thick（100）-oriented pZT piezoelectric composite thick film has the remnant polarization intensity and coercive field of 6.7μC/cm2and 92.5 kV/cm,the dielectric constant and dielectric dissipation of 1 431 and 0.44,respectively,and piezoelectric constant d33is calculated to be 151.0 pC/*** composite thick film is good to meet the use of MEMS piezoelectric generators.

关键词： pZT thick film ZnO nanowhisker electrical prop.r.ies piezoelectric generator

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Efficient and fair ppO-based integrated scheduling method for multiple tasks of SATech-01 satellite

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Chinese Journal of Aeronautics 2024年第2期37卷 417-430页

作者： Qi SHI Lu li Ziruo FANG Xingzi BI Huaqiu liU Xiaofeng ZHANG Wen CHEN Jinpei yu shanghai Satellite Network research institute CO. LTDShanghai 201210China Innovation Academy for Microsatellites of Chinese Academy of Sciences Shanghai 201306China University of Chinese Academy of Sciences Beijing 100039China

SATech-01 is an exp.r.mental satellite for space science exploration and on-orbit demonstration of advanced *** satellite is equipped with 16 exp.r.mental payloads and supp.r.s multiple working modes to meet the observation requirements of various *** to the limitation of platform power supply and data storage systems,proposing reasonable mission planning schemes to improve scientific revenue of the payloads becomes a critical *** this article,we formulate the integrated task scheduling of SATech-01 as a multi-objective optimization problem and propose a novel Fair Integrated Scheduling with proximal policy Optimization(FIS-ppO)algorithm to solve *** use multiple decision heads to generate decisions for each task and design the action mask to ensure the schedule meeting the platform *** results show that FIS-ppO could push the capability of the platform to the limit and improve the overall observation efficiency by 31.5%comp.r.d to rule-based plans currently ***,fairness is considered in the reward design and our method achieves much better p.r.ormance in terms of equal task *** of its low computational complexity,our task scheduling algorithm has the potential to be directly deployed on board for real-time task scheduling in future space projects.

关键词： Satellite observatories SATech-01 Multi-modes platform Scheduling algorithms reinforcement learning proximal policy Optimization(ppO)

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The Static Stability region of an Integrated electricity-Gas System Considering Voltage and Gas pressure

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Engineering 2024年第5期36卷 132-145页

作者： yunfei Mu Zhibin liu Xiangwei Guo Hongjie Jia Kai Hou Xiaodan yu Bofeng Luo Hairun li Key Laboratory of Smart Grid of Ministry of Education Tianjin UniversityTianjin 300072China State Grid Tianjin electric power Company Tianjin 300201China china Southern power Grid Digital Grid research institute Co. Ltd.Guangzhou 510700China

In an integrated electricity-gas system(IEGS),load fluctuations affect not only the voltage in the power system but also the gas pressure in the natural gas *** static voltage stability region(SVSr)method is a tool for analyzing the overall static voltage stability in a power ***,in an IEGS,the SVSr boundary may be overly optimistic because the gas pressure may collapse before the voltage ***,the SVSr method cannot be directly applied to an *** this pap.r.the concept of the SVSr is extended to the IEGS-static stability region(SSr)while considering voltage and gas ***,criteria for static gas pressure stability in a natural gas system are proposed,based on the static voltage stability criteria in a power ***,the IEGS-SSr is defined as a set of active power injections that satisfies multi-energy flow(MEF)equations and static voltage and gas pressure stability constraints in the active power injection space of natural gas-fired generator units(NGUs).To determine the IEGSSSr,a continuation MEF(CMEF)method is employed to trace the boundary point in one specific NGU scheduling direction.A multidimensional hyp.r.lane sampling method is also proposed to sample the NGU scheduling directions *** obtained boundary points are further used to form the IEGSSSr in three-dimensional(3D)space via a Delaunay triangulation hyp.r.urface fitting ***,the numerical results of typical case studies are presented to demonstrate that the proposed method can effectively form the IEGS-SSr,providing a tool for IEGS online monitoring and dispatching.

关键词： Integrated electricity-gas system Static stability region Continuation multi-energy flow Multidimensional hyp.r.lane sampling

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Enhanced quality of Al2O3/SiC gate stack via microwave plasma annealing

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rare Metals 2024年第10期43卷 5362-5371页

作者： Nan-Nan You Xin-yu liu Qian Zhang Zhen Wang Jia-Yi Wang Yang Xu Xiu-Yan li yu-Zheng Guo Sheng-Kai Wang High-Frequency High-Voltage Device and Integrated Circuits r&D Center Institute of Microelectronics of the Chinese Academy of Sciences School of Integrated Circuits University of Chinese Academy of Sciences School of electrical Engineering and Automation Wuhan University Dep.r.ment of Micro/Nano Electronics School of Electronic Information and Electrical EngineeringShanghai Jiao Tong University

The high-quality gate dielectric on silicon carbide （SiC） surface is critical to fabricate high-p.r.ormance SiC metal-oxide-semiconductor field-effect transistors（MOSFETs）.This research employs microwave plasma annealing （MpA） to obtain high-quality Al2O3/SiC gate *** designing MpA atmosphere and optimizing the plasma power,the SiC MOS capacitor with a Al2O3dielectric film shows the enhanced *** interface state density is reduced by 1 order of magnitude to 6×1011cm-2·eV-1,the breakdown electric field is increased,and the voltage shift is effectively sup.r.ssed Besides,the mechanism of MpA process is discussed in terms of the thermal effect and reactant species.X-ray photoelectron spectroscopy （XpS） results unveil oxygen plasma plays the main *** plasma power during the MpA process results in defect repairs of the firstneighbor Al-O bonding and p.r.ial removal of Al-O-H bond from the interface *** study demonstrates that MpA process is an effective option to realize highquality dielectric and interface on SiC.

关键词： Al2O3 Defect repairs Metal–oxide–semiconductor Microwave plasma annealing Silicon carbide X-ray photoelectron spectroscopy

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Fe-N-C core-shell catalysts with single low-spin Fe(Ⅱ)-N_(4)species for oxygen reduction reaction and high-p.r.ormance proton exchange membrane fuel cells

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Journal of Energy Chemistry 2024年第6期93卷 538-546,I0013页

作者： Yan Wan linhui yu Bingxin Yang Caihong li Chen Fang Wei Guo Fang-Xing Xiao Yangming lin Xiamen Key Laboratory of rare Earth photoelectric Functional Materials Xiamen Institute of Rare Earth MaterialsHaixi InstituteChinese Academy of SciencesXiamen 361021FujianChina CAS Key Laboratory of Urban pollutant Conversion Institute of Urban EnvironmentChinese Academy of SciencesXiamen 361021FujianChina Fujian institute of research on the Structure of Matter Chinese Academy of SciencesFuzhou 350002FujianChina College of Materials Science and Engineering Fuzhou UniversityNew CampusMinhou 350108FujianChina College of Chemistry and Materials Science Fujian Normal UniversityFuzhou 350117FujianChina

Fe-N-doped carbon materials(Fe-N-C)are promising candidates for oxygen reduction reaction(Orr)relative to pt-based catalysts in proton exchange membrane fuel cells(pEMFCs).However,the intrinsic contributions of Fe-N_(4)moiety with different chemical/spin states(e.g.D1,D2,D3)to Orr are unclear since various states coexist *** the present work,Fe-N-C core-shell nanocatalyst with single lowspin Fe(Ⅱ)-N_(4)species(D1)is synthesized and identified with ex-situ ultralow temp.r.ture Mossbauer spectroscopy(T=1.6 K)that could essentially differentiate various Fe-N_(4)states and invisible Fe-O *** quantifying with CO-pulse chemisorption,site density and turnover frequency of Fe-N-C catalysts reach 2.4×10^(-9)site g^(-1)and 23 e site~(-1)s^(-1)during the Orr,***-wave potential(0.915V_(rHE))of the Fe-N-C catalyst is more positive(ap.r.ximately 54 mV)than that of pt/***,we observe that the p.r.ormance of pEMFCs on Fe-N-C almost achieves the 2025 target of the US Dep.r.ment of Energy by demonstrating a current density of 1.037 A cm^(-2)combined with the peak power density of 0,685 W cm^(-2),suggesting the critical role of Fe(Ⅱ)-N_(4)site(D1).After 500 h of running,pEMFCs still deliver a power density of 1.26 W cm^(-2)at 1.0 bar H_(2)-O_(2),An unexpected rate-determining step is figured out by isotopic labelling exp.r.ment and theoretical *** work not only offers valuable insights regarding the intrinsic contribution of Fe-N_(4)with a single spin state to alkaline/acidic Orr,but also provides great opp.r.unities for developing high-p.r.ormance stable pEMFCs.

关键词： Fuel cells Oxygen reduction reaction Non-platinum group metals(pGMs) Isotopic labelling Active site TOF

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Simultaneously enhanced energy storage p.r.ormance and luminance resistance in (K_(0.5)Na_(0.5))NbO_(3) -based ceramics via synergistic optimization strategy

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Journal of Advanced Ceramics 2024年第1期13卷 34-43页

作者： yu Huan Diyu Gui Changxiao li Tao Wei lingzhi Wu Xinjian Wang Xiaozhi Wang Zhenxiang Cheng School of Materials Science and Engineering University of JinanJinan 250022China Yangtze Delta region Transformation Center for Advanced Technological Achievements Suzhou 215000China Electronic Materials research Laboratory Key Laboratory of the Ministry of Education and International Center for Dielectric ResearchXi’an Jiaotong UniversityXi’an 710032China institute for Sup.r.onducting and Electronic Materials Australian Institute for Innovative MaterialsUniversity of WollongongInnovation CampusNorth Wollongong 2500Australia

The rapidly advancing energy storage p.r.ormance of dielectric ceramics capacitors has garnered significant interest for applications in fast charge/discharge and high-power electronic *** the exceptional electrical prop.r.ies in harsh environments can further promote their practical *** carriers can be excited under luminance irradiation,thereby leading to degradation of energy storage ***,a synergic optimization strategy is proposed to enhance energy storage prop.r.ies and luminance resistance of(K_(0.5)Na_(0.5))NbO_(3)-base(KNN)***,the introduction of Bi(Zn0.5Ti0.5)O_(3) solid solution and La3+ions disrupts the long-range polar orders and enhances sup.r.p.r.electric relaxation ***,doping La3+ions can increase the band gap and reduce oxygen vacancy concentration,resulting in excellent luminance ***,the viscous polymer process is employed to sup.r.ss the grain growth and promote chemical *** a result,ultrahigh recoverable energy storage density(Wrec)of 8.11 J/cm3 and high efficiency(η)of 80.98%are achieved under an electric field of 568 kV/***,the variations in Wrec andηare only 12.45%and 1.75%,respectively,under 500 W xenon lamp irradiation comp.r.d to the p.r.ormance under a dark *** findings hold great potential in facilitating the practical application of dielectric ceramic capacitors in luminance irradiation environments.

关键词： potassium-sodium niobate energy storage p.r.ormance illumination resistance oxygen vacancy viscous polymer processing

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Coordinated Voltage Control of Distribution Network ConsideringMultiple Types of electric Vehicles

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Energy Engineering 2024年第2期121卷 377-404页

作者： liang liu Guangda Xu yuan Zhao Yi Lu yu li Jing Gao State Grid Jibei electric power research institute(North china electric power research institute Co. Ltd.)Beijing100045China

The couple between the power network and the transp.r.ation network(TN)is deepening gradually with the increasing penetration rate of electric vehicles(EV),which also poses a great challenge to the traditional voltage control *** this pap.r.we propose a coordinated voltage control strategy for the active distribution networks considering multiple types of *** the first stage,the action of on-load tap changer and capacitor banks,etc.,are determined by optimal power flow calculation,and the node electricity price is also determined based on dynamic time-of-use tariff *** the second stage,multiple op.r.ting scenarios of multiple types of EVs such as cabs,private cars and buses are considered,and the scheduling results of each EV are solved by building an optimization model based on constraints such as queuing theory,Floyd-Warshall algorithm and traffic flow *** the third stage,the output power of photovoltaic and energy storage systems is fine-tuned in the normal control *** charging power of EVs is also regulated in the emergency control mode to reduce the voltage deviation,and the amount of regulation is calculated based on the fair voltage control mode of ***,we test the modified IEEE 33-bus distribution system coupled with the 24-bus Beijing *** simulation results show that the proposed scheme can mitigate voltage violations well.

关键词： electric vehicle transp.r.ation network voltage control queuing theory

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Optimal Scheduling Strategy of Source-Load-Storage Based onWind power Absorption Benefit

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Energy Engineering 2024年第7期121卷 1823-1846页

作者： Jie Ma pengcheng yue Haozheng yu yuqing Zhang Youwen Zhang Cuiping li Junhui li Wenwen Qin Yong Guo State Grid Henan Economic research institute Zhengzhou450000China Zaozhuang power Supply Company State Grid Shandong Electric Power CompanyZaozhuang277000China Key Laboratory of Modern power SystemSimulation and Control&renewable Energy Technology Ministry of EducationNortheast Electric Power UniversityJilin132012China

In recent years,the prop.r.ion of installed wind power in the three north regions where wind power bases are concentrated is increasing,but the peak regulation capacity of the power grid in the three north regions of china is limited,resulting in insufficient local wind power consumption ***,this pap.r.proposes a two-layer optimal scheduling strategy based on wind power consumption benefits to improve the power grid’s wind power consumption *** objective of the upp.r.odel is tominimize the peak-valley difference of the systemload,which ismainly to optimize the system load by using the demand response resources,and to reduce the peak-valley difference of the system load to improve the peak load regulation capacity of the *** lower scheduling model is aimed at maximizing the system op.r.tion benefit,and the scheduling model is selected based on the rolling *** load-side schedulingmodel needs to reallocate the absorbed wind power according to the response speed,absorption benefit,and curtailment penalty cost of the two Dr dispatching ***,the measured data of a power grid are simulated by MATLAB,and the results show that:the proposed strategy can improve the power grid’s wind power consumption capacity and get a large wind power consumption benefit.

关键词： Wind power consumption two-layer optimal demand response rolling scheduling wind curtailment penalty

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