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Prospective study on observations of γ-ray sources in the Galaxy using the HADAR experiment

Frontiers of physics 2022年第6期17卷 1-14页

作者： Xiangli Qian {1. Sun Tianlu chen Danzengluobu Youliang Feng Qi Gao Quanbu Gou Yiqing Guo Hongbo hu Mingming Kang Haijin li cheng liu Maoyuan liu Wei liu Bingqiang Qiao Xu Wang Zhen Wang Guangguang Xin Yuhua Yao Qiang Yuan Yi Zhang school of Intel{1.gent engineering Shandong Management UniversityJinan 250357China The Key Laboratory of Cosmic Rays(Tibet university) Ministry of EducationLhasa 850000China Key Laboratory of Particle Astrophysics Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China university of Chinese Academy of {1.s 19 A Yuquan RoadShijingshan DistrictBeijing 100049China College of physics Sichuan UniversityChengdu 610064China Tsung-Dao Lee Institute Shanghai Jiao Tong UniversityShanghai 200240China school of {1. and technology Wuhan UniversityWuhan 430072China Key Laboratory of Dark Matter and Space Astronomy Purple Mountain ObservatoryChinese Academy of SciencesNanjing 210008China

The High Altitude Detection of Astronomical Radiation(HADAR)experiment is a refracting terrestrial telescope array based on the atmospheric Cherenkov imaging *** focuses the Cherenkov light emitted by extensive air showers through a large aperture water-lens system for observing very-high-energyγ-rays and cosmic *** the advantages of a large field-of-view(FOV)and low energy threshold,the HADAR experiment operates in a large-scale sky scanning mode to observe galactic *** study presents the prospects of using the HADAR experiment for the sky survey of TeVγ-ray sources from TeVCat and provids a one-year survey of statistical *** from the simulation show that a total of 23 galactic point sources,including five supernova remnant sources and superbubbles,four pulsar wind nebula sources,and 1. unidentified sources,were detected in the HADAR FOV with a significance greater than 5 standard deviations(σ).The statistical significance for the Crab Nebula during one year of operation reached 346.0σand the one-year integral sensitivity of HADAR above 1.TeV was~1.3%–2.4%of the flux from the Crab Nebula.

关键词： HADAR Galactic sources significance gamma rays

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Surface Molecular Encapsulation with Cyclodextrin in Promoting the Activity and Stability of Fe Single-Atom Catalyst for Oxygen Reduction Reaction

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Energy & Environmental materials 2023年第2期6卷 303-310页

作者： Changli {1. Haijing li Jingzhao {1. Dong li Wenxing {1. Juncai Dong Mengru Sun Yujing li beijing Key Laboratory of Construction Tailorable Advanced Functional {1. and Green Applications Experimental Center of Advanced MaterialsSchool of Materials Science and EngineeringBeijing Institute of TechnologyBeijing 100081China beijing Synchrotron Radiation Faci{1.ty Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China Clean Nano Energy Center State Key Laboratory of Metastable Materials Science and TechnologyYanshan UniversityQinhuangdao 066004China

Fe single-atom catalysts(Fe-SACs)have been extensively studied as a highly efficient electrocatalyst toward the oxygen reduction reaction(ORR).Nonetheless,they suffer from stability issue induced by dissolution of Fe metal center and the OH^(−)***,a surface molecular {1. strategy is developed by usingβ-cyclodextrins(CDs)as a localized molecular *** CD-modified Fe-SAC(Fe-SNC-β-CD)shows obviously improved activity toward the ORR with 0.90 V,4.1. and 4.09 mA cm^(-2)for E_(1.2),J_(0)and Jk0.9,***,the Fe-SNC-β-CD shows the excellent long-term stability against aggressive stress and the *** is confirmed through electrochemical investigation that modification ofβ-CD can,on one hand,regulate the atomic Fe coordination chemistry through the interaction between the CD and FeN_(x) moiety,while on the other mitigate the strong adsorption of OH^(−)and function as protective barrier against the poisoning molecules leading to enhanced ORR activity and stability for the *** molecular encapsulation strategy demonstrates the uniqueness of post-pyrolysis surface molecular {1. for the design of single-atom catalyst.

关键词： oxygen reduction reaction singe atom catalyst stability surface molecular engineering

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Microscopic growth mechanism and edge states of monolayer 1.'-MoTe2

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Chinese physics B 2024年第4期33卷 474-480页

作者：赵海鹏刘隐杨胜国林陈昉陈明星 Kai Braun 罗心仪李思宇潘安练王笑 Key Laboratory for Micro-Nano physics and {1. of hunan Province School of Physics and ElectronicsCollege of Materials Science and Engineering Hunan University Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education Synergetic Innovation Centre for Quantum Effects and Applications (SICQEA) Hunan Normal University State Key Laboratory of Powder Metallurgy Central South University Institute of Physical and Theoretical Chemistry and liSA+ University of Tübingen

Transition metal ditellurides（TMTDs） have versatile physical properties,including non-trivial topology,Weyl semimetal states and unique spin *** growth of high-quality and large-scale monolayer TMTDs with preferred crystal phases is crucial for their ***,we demonstrate the epitaxial growth of 1.'-MoTe2on Au（1.1.and graphitized silicon carbide（Gr/SiC） by molecular beam epitaxy（MBE）.We investigate the morphology of the grown1.'-MoTe2at the atomic level by scanning tunnelling microscopy（STM） and reveal the corresponding microscopic growth *** is found that the unique ordered Te structures preferentially deposited on Au（1.1. regulate the growth of monolayer single crystal 1.'-MoTe2,while the Mo clusters were preferentially deposited on the Gr/SiC substrate,which impedes the ordered growth of monolayer *** confirm that the size of single crystal 1.'-MoTe2grown on Au（1.1.is nearly two orders of magnitude larger than that on Gr/*** scanning tunnelling spectroscopy（STS）,we observe that the STS spectrum of the monolayer 1.'-MoTe2nano-island at the edge is different from that at the interior,which exhibits enhanced conductivity.

关键词： 1.′-MoTe2 microscopic growth mechanism scanning tunneling microscopy/spectroscopy (STM/S) transition metal ditellurides

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Recent advances in the utilization of copper sulfide compounds for electrochemical CO2 reduction

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纳米材料科学：英文版 2020年第3期2卷 235-247页

作者： Yingkang chen Kejun chen Junwei Fu Akira Yamaguchi Hongmei li Hao Pan Junhua hu Masahiro Miyauchi Min liu State Key Laboratory of Powder Metallurgy Shenzhen Research InstituteSchool of Physics and ElectronicsCentral South UniversityPR China Department of Periodontics&Oral Mucosal Section Xiangya Stomatological HospitalCentral South University72 Xiangya RoadChangsha410008HunanPR China school of {1. science and engineering Zhengzhou UniversityZhengzhou450002PR China Department of materials {1. and engineering School of Materials and Chemical TechnologyTokyo Institute of Technology2-12-1 OokayamaMeguro-kuTokyo152-8552Japan

Converting carbon dioxide(CO2)into value-added chemicals by CO2 reduction has been considered as a potential way to solve the current energy crisis and environmental *** the methods of CO2 reduction,the electrochemical method has been widely used due to its mild reaction condition and high reaction *** the electrochemical reduction system,the CO2 electrocatalyst is the most important *** many CO2 electrocatalysts have been developed,efficient catalysts with high activity,selectivity and stability are still *** sulfide compound,as a low-toxicity and emerging material,has broad prospects in the field of CO2 reduction due to its unique structural and electrochemical *** progress has been achieved with copper sulfide nanocrystalline and the field is rapidly *** paper summarizes the preparation,recent progress in development,and factors affecting the electrocatalytic CO2 reduction performance with copper sulfide compound as a *** for future development are also outlined,with the aim of using copper sulfide compound as a highly active and stable electrocatalyst for CO2 reduction.

关键词： CO2 reduction Copper sulfide compound Electrocatalyst Product selectivity

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Cobalt coordination with pyridines in sulfurized polyacrylonitrile cathodes to form conductive pathways and catalytic M-N4S sites for accelerated li-S kinetics

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Journal of Energy Chemistry 2021年第10期30卷 170-178,I0005页

作者： Amir Abdul Razzaq Ganwen chen Xiao{1.i Zhao Xietao Yuan Jiapeng {1. Ziwei li Yufeng chen Jiabin Xu Rahim Shah Jun Zhong Yang Peng Zhao Deng Soochow Institute for Energy and materials Innovations College of EnergySoochow UniversitySuzhou 215006JiangsuChina Key Laboratory of Advanced Carbon materials and Wearable Energy Technologies of Jiangsu Province Soochow UniversitySuzhou 215006JiangsuChina Institute of Functional Nano and Soft materials Laboratory(FUNSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials&DevicesSoochow UniversitySuzhou 215123JiangsuChina school of {1. University of Electronic Science and Technology of ChinaChengdu 610054SichuanChina

Sulfurized polyacrylonitrile(SPAN)represents a unique class of cathode material for lithium sulfur(li-S)batteries as it eradicates the polysulfides shuttling issue in carbonate-based ***,due to the essential chemical S-linking and organic nature of SPAN,the active mass percentage and rate capability are two bottleneck issues preventing its ultimate deployment outside of *** the current work,aiming to endow both the charge conductivity and catalytic activity to SPAN for maximizing the redox kinetics of S conversion,a freestanding nanofibrous SPAN cathode embedding conductive CNTs and atomically dispersed Co centers is fabricated via multivariate *** the CNTs enable dramatically enhancing the fiber conductivity and generating mesoscopic porosity for facilitating charge and mass transportation,the cross-linking of SPAN by Co-N_(4) S motifs creates extra charge conduction pathways and further serves as the catalytic active sites for expediting redox S *** a result,an extraordinary li-SPAN performance is achieved with a high specific capacity up to 1.56 mAh g^(-1.@0.2 C,a superb rate capability up to 1. C,and an ultra-long battery life up to 1.00 cycles@1.***,our study here provides insights into the adoption of coordination chemistry to maximize the sulfur utilization by ensuring a more complete redox conversion from SPAN to li2 S,and vice versa.

关键词： Sulfurized polyacrylonitrile Electrospinning Cobalt Coordination chemistry lithium sulfur batteries

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Simultaneously removal of P and B from Si by Sr and Zr co-addition during Al–Si low-temperature solvent refining

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International Journal of Minerals,Metallurgy and materials 2023年第2期30卷 365-377页

作者： chen chen Jingwei li Qiuxia Zuo Boyuan Ban Jian chen Key Lab of Photovoltaic and Energy Conservation materials Institute of Solid State PhysicsHFIPSChinese Academy of SciencesHefei 230031China university of {1. and technology of china Hefei 230026China school of {1. science and engineering Hefei University of TechnologyHefei 230009China State Key Laboratory of Mineral Processing BGRIMM Technology GroupBeijing 100160China State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization Kunming University of Science and TechnologyKunming 650504China engineering Research Center of High Performance Copper Alloy {1. and Processing Ministry of EducationHefei University of TechnologyHefei 230009China Shandong Aluminum Vocational College Weihai 264400China

To remove the key impurity elements,P and B,from primary Si simultaneously,Sr and Zr co-addition to Al-Si alloy systems during solvent refining has been *** reacts with Al,Si,and P in the melt to form a P-containing Al_(2)Si_(2)Sr phase and Zr reacts with B to form a ZrB_(2) *** the Al-Si-Sr-Zr system,high removal fractions of P and B in the primary Si,with 84.8%-98.4%and 90.7%-96.7%,respectively,are achieved at the same time,*** best removal effect is obtained in the sample with the addition of Sr-32000+Zr-3000μg·kg^(-1.,and the removal fractions of P and B in the purified Si reach 98.4%and 96.1..Compared with the Sr/Zr single-addition,the removal effects of Sr and Zr co-addition on P and B do not show a significant downward trend,indicating that the nucleation and growth of the B/P-containing impurity phases are mutually ***,an evolution model is proposed to describe the nucleation and the growth stages of Sr/Zr-containing compound phases,which reveals the interaction between the impurity phases and the primary Si.

关键词： Al2Si2Sr phase zirconium boride phase phase directional solidification solvent refining

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Magnetocaloric and Colossal Magnetoresistance Effect in Layered Perovskite La_(1.4) Sr_(1.6)Mn_2O_7

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Journal of materials {1. & technology 2010年第3期26卷 234-236页

作者： li'an Han Changle {1. school of {1. Northwestern Polytechnical University Xi'an 710072 China Department of applied {1. Xi'an University of Science and Technology Xi'an 710054 China

Magnetocaloric and colossal magnetoresistance effects of the layered perovskite La 1.4 Sr 1.6 Mn 2 O 7 compound have been studied.A broad peak of magnetic entropy change （-△S M） is found above the Curie temperature （T C =1.0 K）,which can be associated with the existence of two-dimensional short range ferromagnetic ***,the curvilinear shape of-△S M for layered perovskite is quite different from that of the Ln 1.x A x MnO 3 probably arising from magnetocrystalline *** the same time,a wide peak of colossal magnetoresitance effect near T C is found in the layered provskite La 1.4 Sr 1.6 Mn 2 O 7.

关键词： Magnetocaloric effect Layered perovskite Colossal magnetoresistance

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Integrating molybdenum sulfide selenide-based cathode with C-O-Mo heterointerface design and atomic engineering for superior aqueous Zn-ion batteries

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Nano Research 2023年第4期16卷 4933-4940页

作者： Hong li Biao {1. Runhua Gao Fugui Xu Xinzhu Wen Xiongwei Zhong Chuang li Zhihong Piao Nantao hu Xiao Xiao Feng Shao Guangmin Zhou Jinlong Yang Guangdong Research Center for Interfacial engineering of Functional {1. College of Materials Science and EngineeringShenzhen UniversityShenzhen 518060China College of physics and Optoelectronic {1. Shenzhen UniversityShenzhen 518060China Tsinghua-Berkeley Shenzhen Institute&Tsinghua Shenzhen International Graduate school Tsinghua UniversityShenzhen 518055China Key Laboratory for Thin Film and Microfabrication technology of the Ministry of Education School of ElectronicsInformation and Electrical EngineeringShanghai Jiao Tong UniversityShanghai 200240China school of {1. science and engineering and Tianjin Key Laboratory of Composite and Functional {1. Tianjin UniversityTianjin 300350China school of Chemistry and Chemical {1. Shanghai Key Laboratory of Electrical Insulation and Thermal AgeingShanghai Jiao Tong UniversityShanghai 200240China school of {1. and technology College Yang-en UniversityQuanzhou 362014China

Transition metal dichalcogenides(TMDs)have been regarded as promising cathodes for aqueous zinc-ion batteries(AZIBs)but suffer from sluggish reaction kinetics due to their poor conductivity and the strong electrostatic interaction between Zn-ion and cathode ***,a well-defined structure with MoSSe nanosheets vertically anchored on graphene is used as the cathode for *** dissolution of Se into MoS2 lattice together with heterointerface design via developing C-O-Mo bonds improves the inherent conductivity,enlarges interlayer spacing,and generates abundant anionic *** a result,the Zn2+intercalation/deintercalation process is greatly improved,which is confirmed by theoretical modeling and ex-situ experimental ***,the assembled AZIBs exhibit high-rate capability(1.4.2 mAh·g^(−1.at 5 A·g^(−1.)and long cycling life(83%capacity retention after 1.200 cycles at 2 A·g^(−1.).Moreover,the assembled quasi-solid-state Zn-ion batteries demonstrate a stable cycling performance over 1.0 cycles and high capacity retention over 94%after 2,500 bending *** study provides a new strategy to unlock the electrochemical activity of TMDs via interface design and atomic engineering,which can also be applied to other TMDs for multivalent batteries.

关键词： Zn2+kinetics heterointerface design atomic engineering anion vacancy

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Diminishing ether-oxygen content of electrolytes enables temperature-immune lithium metal batteries

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中国科学:化学英文版 2023年第9期66卷 2700-2710页

作者： Tao liu Jingnan Feng Zhe Shi {1.ajun li Weina Zhao Minglei Mao Xiangzhen Z{1. Yong-Sheng {1. Hong li Xuejie {1.ang liquan chen liumin Suo beijing National Laboratory for Condensed Matter {1. Institute of PhysicsChinese Academy of SciencesBeijing 100190China Qingdao Industrial Energy Storage Research Institute Qingdao Institute of Bioenergy and Bioprocess TechnologyChinese Academy of SciencesQingdao 266101China Department of Nuclear science and {1. and Department of materials science and {1. Massachusetts Institute of TechnologyCambridgeMA 02139USA Guangzhou Key Laboratory of Environmental Catalysis and Pollution Control Guangdong Key Laboratory of Environmental Catalysis and Health Risk ControlSchool of Environmental Science and EngineeringInstitute of Environmental Health and Pollution ControlGuangdong University of TechnologyGuangzhou 510006China

The reversibility of lithium(li) metal anodes is highly susceptible to temperature,owing to the aggravated side reactions at high temperatures and serious li dendrite growth at low *** it is extremely challenging to simultaneously realize the high li reversibility in both low and high temperature ***,an oxygen-free solvent(n-hexane,HEX) assisted with the hexyl methyl ether and 1.mol L^(-1.lithium bis(fluorosulfonyl)imide is proposed to constitute an electrolyte for temperatureimmune lithium metal *** demonstrates that the HEX not only greatly suppresses the solvent reduction even at high temperatures but also weaken the li~+-solvent interaction for the facile li-ion desolvation,leading to high li Coulombic efficiencies(99.59% at 25℃,99.30%at 60℃ and 98.75% at -30℃) and the dendrite-free li plating from -30℃ to 60℃.Benefitting from the low density and temperature-immune properties of our electrolyte,the sulfurized polyacrylonitrile(3.8mAh cm^(-2))||li(60 μm) pouch-cells deliver 278 Wh kg^(-1.energy density and maintain the stable performance over 50 cycles,and retain 248 and 320 Wh kg^(-1. energy density at -30℃ and 60℃,*** work provides a new perspective on the electrolyte design for wide-temperature li metal batteries.

关键词： wide temperature range oxygen-free solvent dendrite-free li plating high Coulombic efficiencies lithium metal batteries

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Design of phase interface and defect in niobium-nickel oxide for ultrafast li-ion storage

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Journal of materials {1. & technology 2023年第16期147卷 145-152页

作者： Haiting chen Haoyan cheng Hangchen liu Yibo hu Tongtong Yuan Shuge Dai Meilin liu Hao hu Collaborative Innovation Center of Nonferrous Metals School of Materials Science and EngineeringHenan University of Science and TechnologyLuoyang 471023China Key Laboratory of Material physics of Ministry of Education School of Physics and EngineeringZhengzhou UniversityZhengzhou 450052China school of {1. science and engineering Georgia Institute of TechnologyAtlantaGA30332-0245United States of America

Niobium pentoxide(Nb2O5)has attracted much attention in lithium batteries due to its advantages of high operating voltage,large theoretical capacity,environmental friendliness and ***,the intrinsic poor electrical conductivity,sluggish kinetics,and large volume changes hinder its electrochemical performance at high power density,making it away from the requirements for practical *** this research work,we regulate the electron transport of niobium-nickel oxide(NiNbO)anode material with enhanced structural stability at high power density by constructing the two-phase boundaries between niobium pentoxide(Nb2O5)and nickel niobate(NiNb2O6)through simple solid phase *** addition,the presence of lattice defects in NiNbO-F further speeds up the transport of li+and promotes the electrochemical reaction kinetics more *** two-phase boundaries and defect modulated anode material displays high li+diffusion coefficient of 1.63×1.^(−1.) cm^(2) s^(−1.,pretty high initial discharge capacity of 222.8 mAh g^(−1. at 1.C,extraordinary high rate performance(66.7 mAh g^(−1.)at an ultrahigh rate(1.0 C)and ultra-long cycling stability under high rate of 25 C(83.4 mAh g^(−1. after 2000 cycles)with only 0.01.%attenuation per *** results demonstrate an effective approach for developing electrode materials that greatly improve rate performance and durability.

关键词： Niobium oxide Phase interface Defects Rate performance lithium-ion batteries

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