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Hierarchically Structured Nb_(2)O_5 Microflowers with Enhanced Capacity and Fast-Charging Capability for Flexible Planar Sodium Ion Micro-Supercapacitors

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Nano-Micro Letters 2024年第4期16卷 97-109页

作者： Jiaxin Ma Jieqiong Qin Shuanghao Zheng Yinghua Fu Liping Chi Yaguang Li Cong Dong Bin Li Feifei Xing Haodong Shi Zhong‑Shuai Wu State Key Laboratory of Catalysis Dalian Institute of Chemical PhysicsChinese Academy of Sciences457 Zhongshan RoadDalian 116023People’s Republic of China School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450001People’s Republic of China College of Science Henan Agricultural UniversityNo.63 Agricultural RoadZhengzhou 450002People’s Republic of China Dalian National Laboratory for Clean Energy Chinese Academy of Sciences457 Zhongshan RoadDalian 116023People’s Republic of China University of Chinese Academy of Sciences 19A Yuquan RoadShijingshan DistrictBeijing 100049People’s Republic of China Hebei Key Lab of Optic‑Electronic Information and Materials The College of Physics Science and TechnologyInstitute of Life Science and Green DevelopmentHebei UniversityBaoding 071002People’s Republic of China

Planar Na ion micro-supercapacitors(NIMSCs) that offer both high energy density and power density are deemed to a promising class of miniaturized power sources for wearable and portable microelectron-ics. Nevertheless, the development of NIMSCs are hugely impeded by the low capacity and sluggish Na ion kinetics in the negative ***, we demonstrate a novel carbon-coated Nb_(2)O_5 microflower with a hierarchical structure composed of vertically intercrossed and porous nanosheets, boosting Na ion storage performance. The unique structural merits, including uniform carbon coating, ultrathin nanosheets and abun-dant pores, endow the Nb_(2)O_5 microflower with highly reversible Na ion storage capacity of 245 mAh g^(-1) at 0.25 C and excellent rate *** from high capacity and fast charging of Nb_(2)O_5 microflower, the planar NIMSCs consisted of Nb_(2)O_5 negative electrode and activated car-bon positive electrode deliver high areal energy density of 60.7 μWh cm^(-2),considerable voltage window of 3.5 V and extraordinary cyclability. Therefore, this work exploits a structural design strategy towards electrode materials for application in NIMSCs, holding great promise for flexible microelectronics.

关键词： Nb_(2)O_5 nanosheets Microflowers Sodium ion micro-supercapacitors Flexibility Energy storage

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Two-dimensional In_(2)Se_(3):A rising advanced material for ferroelectric data storage

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InfoMat 2022年第8期4卷 54-81页

作者： Yu-Ting Huang Nian-Ke Chen Zhen-Ze Li Xue-Peng Wang Hong-Bo Sun Shengbai Zhang Xian-Bin Li State Key Laboratory of Integrated Optoelectronics College of Electronic Science and EngineeringJilin UniversityChangchunChina State Key Lab of Precision Measurement Technology and Instruments Department of Precision InstrumentTsinghua UniversityBeijingChina Department of Physics Applied Physicsand AstronomyRensselaer Polytechnic InstituteTroyNew YorkUSA

Ferroelectric memory is a promising candidate for next-generation nonvolatile memory owing to its outstanding performance such as low power consump-tion,fast speed,and high ***,the ferroelectricity of conven-tional ferroelectric materials will be eliminated by the depolarization field when the size drops to the nanometer *** a result,the miniaturization of ferroelectric devices was hindered,which makes ferroelectric memory unable to keep up with the development of integrated-circuit(IC)***,a two-dimensional(2D)In2Se3 was reported to maintain stable ferro-electricity at the ultrathin scale,which is expected to break through the bottle-neck of ***,devices based on 2D In2Se3,including the ferroelectric field-effect transistor,ferroelectric channel transistor,synaptic fer-roelectric semiconductor junction,and ferroelectric memristor were ***,a comprehensive understanding of the structures and the ferroelectric-switching mechanism of 2D In2Se3 is still ***,the atomic structures of different phases,the dynamic mechanism of ferroelectric switching,and the performance/functions of the latest devices of 2D In2Se3 are ***,the correlations among the structures,the properties,and the device performance are ***,several crucial problems or challenges and possible research directions are put *** hope that this review paper can provide timely knowledge and help for the research commu-nity to develop 2D In2Se3 based ferroelectric memory and computing technol-ogy for practical industrial applications.

关键词： 2D ferroelectric device 2D ferroelectric material 2D In2Se3 neuromorphic computing nonvolatile memory

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Magneto-optical trap reaction microscope for photoionization of cold strontium atoms

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Physical Review A 2024年第2期109卷 023118-023118页

作者： Shushu Ruan Xinglong Yu Zhenjie Shen Xincheng Wang Jie Liu Zhixian Wu Canzhu Tan Peng Chen Tian-Min Yan Xueguang Ren Matthias Weidemüller Bing Zhu Yuhai Jiang Shanghai Advanced Research Institute Chinese Academy of Sciences Shanghai 201210 China University of Chinese Academy of Sciences Beijing 100049 China Center for Transformative Science and School of Physical Science and Technology ShanghaiTech University Shanghai 201210 China CAS Center for Excellence in Quantum Information and Quantum Physics University of Science and Technology of China Hefei 230026 China Advanced Materials and Center for Quantum and Science Technology The Hong Kong University of Science and Technology Guangzhou 999077 China School of Physics Xi'an Jiaotong University Xian 710049 China Physikalisches Institut Universität Heidelberg Im Neuenheimer Feld 226 69120 Heidelberg Germany HSBC Lab Guangzhou 510510 China

We developed a magneto-optical trap reaction microscope (MOTREMI) for strontium atoms by combining multiparticle coincident detection with the laser cooling technique. The present compact injection system enables the production of cold Sr atoms in three modes of two-dimensional (2D) magneto-optical trap (MOT) beam, molasses, and three-dimensional (3D) MOT, providing adjustable densities and ratios of the ground state 5s2 (S01) and the excited states 5s5p1P1 and PJ3. The target profiles including temperature, density, and size of the 3D MOT as well as the 2D MOT beam cold atomic flux were characterized in detail. Using the present setup, we investigate the single photoionization of Sr atoms with molasses through few-photons absorption in 800 nm, where Sr+ and e− are detected in coincidence and most of the ionization channels are identified. The momentum resolution for coincident Sr+ and e− along time-of-flight direction are achieved up to 0.12 a.u. and 0.02 a.u., respectively. The spectra of photoelectron ionized from the ground state as well as several excited states show distinct structures manifesting prominent contributions from multiphoton absorption. Detecting complete vector momenta of electrons and recoil ions in coincidence paves a way for further investigation of two-electron correlation dynamics and multielectron effects with alkaline-earth atoms.

关键词： Multiphoton or tunneling ionization & excitation Single- and few-photon ionization & excitation Ultrafast phenomena

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Macroscopic Electromagnetic Cooperative Network‑Enhanced MXene/Ni Chains Aerogel‑Based Microwave Absorber with Ultra‑Low Matching Thickness

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Nano-Micro Letters 2022年第8期14卷 283-299页

作者： Fei Pan Yanping Rao Dan Batalu Lei Cai Yanyan Dong Xiaojie Zhu Yuyang Shi Zhong Shi Yaowen Liu Wei Lu Shanghai Key Lab.of D&A for Metal‑Functional Materials School of Materials Science&EngineeringTongji UniversityShanghai 201804People’s Republic of China Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology School of Physics Science and EngineeringTongji UniversityShanghai 201804People’s Republic of China Materials Science and Engineering Faculty Politehnica University of Bucharest060042 BucharestRomania

Electromagnetic cooperative strategy has been presented as a mainstream approach that can effectively optimize the matching thickness of dielectric loss dominant ***,it is still challenging for dielectric–magnetic loss coexisting-type absorber to develop electromagnetic wave(EMW)performance with ultra-low matching thickness(≤1 mm).Breaking the limitation of traditional electromagnetic response at microscopic/mesoscopic scale,a ficus microcarpa-like magnetic aerogel with macroscopical electromagnetic cooperative effect was fabricated through highly oriented self-assembly *** highly oriented Ni chains with unique macroscopic morphology(~1 cm in length)were achieved via a special magnetic field-induced *** magnetic coupling was observed in the Ni chains confirmed by the micromagnetic *** deductive calculation validates that maintaining high value of electromagnetic parameters at high frequencies is the prerequisites of ultrathin *** electromagnetic cooperative networks with uninterrupted and dual pathways spread through the entire aerogel skeleton,resulting in the impressive permittivity even at high ***,the aerogel exhibits a remarkable EMW performance at an ultrathin thickness of 1 ***,based on the modulation of electromagnetic parameters,this work proposed a macroscopic ordered structure with the electromagnetic cooperative effect useful to develop a suitable strategy for achieving ultrathin EMW absorbers.

关键词： Electromagnetic wave absorption Ti_(3)CNT_(x)MXene Highly oriented Ni chains Electromagnetic cooperation Magnetic coupling

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In situ induced cation-vacancies in metal sulfides as dynamic electrocatalyst accelerating polysulfides conversion for Li-S battery

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Journal of Energy Chemistry 2022年第12期75卷 74-82,I0003页

作者： Rongrong Li Hao Sun Caiyun Chang Yuan Yao Xiong Pu Wenjie Mai Siyuan Laboratory Guangdong Provincial Engineering Technology Research Center of Vacuum Coating Technologies and New Energy MaterialsDepartment of PhysicsJinan UniversityGuangzhou 510632GuangdongChina CAS Center for Excellence in Nanoscience Beijing Key Laboratory of Micro-Nano Energy and SensorBeijing Institute of Nanoenergy and NanosystemsChinese Academy of SciencesBeijing 101400China State Key Laboratory of Power Transmission Equipment and System Security and New Technology School of Electrical EngineeringChongqing UniversityChongqing 400044China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China

Cation vacancy engineering is considered to be one of the effective methods to solve the issues of shuttling and sluggish redox kinetics of Li PSs owing to the intrinsic tunability of electronic ***,cation vacancies are few studied in the Li-S realm due to their complex and rigid preparation *** this work,one-step pyrolysis is reported to in situ introduce Fe-vacancies into iron sulfide(Fe_(0.96)S)as a sulfur *** this host structure,Fe_(0.96)S is first employed as an adsorbent and catalyst in Li-S *** the carbonization process,a tight contact structure of Fe_(0.96)S crystal and carbon network(Fe_(0.96)S@C)is in situ constructed,and the carbon layer as a conductor provides smooth electrons transfer pathways for redox ***,due to the introduction of Fe-vacancies in Fe S crystal,the adsorption capability and catalytic effect for Li PSs have been substantially ***,the presence of Fe_(0.96)S crystal favors the mobility of electron and diffusion of Li+,which is revealed by the experiments and theoretical *** synergy respective advantages effect of Fe_(0.96)S and carbon,the Fe_(0.96)S@C-S cathode delivers high-rate capability at 5.0 C and stable long-life *** under a high sulfur loading of 3.5 mg/cm^(2),the durable cyclic stability is still exhibited with the capacity retention of 93%over 400 cycles at 1.0 C,and the coulombic efficiency is≥98%.Noting that this strategy greatly simplifies the synthetic process of currently known cation-vacancy materials and furnishes a universal mentality for designing both divinable and astonishing new cation-vacancy materials.

关键词： Cation vacancy Fe_(0.96)S@C structure Catalytic conversion Lithium-sulfur battery

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多带笼目超导体CsV_(3)Sb_(5)衍生体系的可调磁通涡旋束缚态

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science Bulletin 2024年第7期69卷 885-892页

作者：黄子豪韩相和赵振刘锦锦李鹏飞谭恒心王秩伟姚裕贵杨海涛颜丙海蒋坤胡江平汪自强陈辉高鸿钧 Beijing National Center for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100190China Centre for Quantum Physics Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement(MOE)School of PhysicsBeijing Institute of TechnologyBeijing 100081China Beijing Key Lab of Nanophotonics and Ultrafine Optoelectronic Systems Beijing Institute of TechnologyBeijing 100081China Department of Condensed Matter Physics Weizmann Institute of ScienceRehovot 7610001Israel Hefei National Laboratory Hefei 230088China Department of Physics Boston CollegeChestnut Hill MA 02467USA

Vortices and bound states offer an effective means of comprehending the electronic properties of ***,surface-dependent vortex core states have been observed in the newly discovered kagome superconductors CsV_(3)Sb_(5).Although the spatial distribution of the sharp zero energy conductance peak appears similar to Majorana bound states arising from the superconducting Dirac surface states,its origin remains *** this study,we present observations of tunable vortex bound states(VBSs)in two chemically-doped kagome superconductors Cs(V_(1-x)Tr_(x))_(3)Sb_(5)(Tr=Ta or Ti),using low-temperature scanning tunneling microscopy/*** CsV_(3)Sb_(5)-derived kagome superconductors exhibit full-gap-pairing superconductivity accompanied by the absence of long-range charge orders,in contrast to pristine CsV_(3)Sb_(5).Zero-energy conductance maps demonstrate a field-driven continuous reorientation transition of the vortex lattice,suggesting multiband *** Ta-doped CsV_(3)Sb_(5)displays the conventional cross-shaped spatial evolution of Caroli-de Gennes-Matricon bound states,while the Tidoped CsV_(3)Sb_(5)exhibits a sharp,non-split zero-bias conductance peak(ZBCP)that persists over a long distance across the *** spatial evolution of the non-split ZBCP is robust against surface effects and external magnetic field but is related to the doping *** study reveals the tunable VBSs in multiband chemically-doped CsV_(3)Sb_(5)system and offers fresh insights into previously reported Y-shaped ZBCP in a non-quantum-limit condition at the surface of kagome superconductor.

关键词： Kagome superconductor Chemical doping Vortex lattice transition Vortex bound states Majorana bound states

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Dissipation-induced Liouville-Majorana modes in open quantum system

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Physical Review Research 2023年第4期5卷 043004-043004页

作者： Xing-Shuo Xu Xiang-Fa Zhou Guang-Can Guo Zheng-Wei Zhou CAS Key Lab of Quantum Information University of Science and Technology of China Hefei 230026 China Synergetic Innovation Center of Quantum Information and Quantum Physics University of Science and Technology of China Hefei 230026 China Hefei National Laboratory University of Science and Technology of China Hefei 230088 China

In open quantum systems, topological edge states rapidly lose coherence, making them unsuitable for topological quantum computation and quantum memory. In this study, we demonstrate that topologically non-Hermitian Liouville-Majorana edge modes (LMEMs) can persist in the extended Liouville-Fock space (LFS) of dissipative quantum spin or fermionic systems. This finding extends the scope of topological modes beyond typical Hermitian systems. By vectorizing the Lindblad equation of a dissipative Ising-type spin system using third quantization, we prove that it can be reduced to a series of non-Hermitian Kitaev chains in the extended LFS and that topologically protected LMEMs emerge due to internal symmetry. Furthermore, we present an explicit method for detecting these modes and demonstrate that the purity of the density matrix characterizes the long-range correlation of LMEMs. Our work offers a new direction for identifying stable topological states in open quantum systems induced by quantum jumps.

关键词： Entanglement detection Open quantum systems & decoherence Symmetry protected topological states Topological phases of matter Spin lattice models

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Sea-urchin-like ReS_(2) nanosheets with charge edge-collection effect as a novel cocatalyst for high-efficiency photocatalytic H_(2) evolution

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Chinese Chemical Letters 2022年第2期33卷 943-947页

作者： Bo Lin Bowen Ma Jiangang Chen Yao Zhou Jiadong Zhou Xiaoqing Yan Chao Xue Xiao Luo Qing Liu Jinyong Wang Renji Bian Guidong Yang Fucai Liu School of Optoelectronic Science and Engineering University of Electronic Science and Technology of ChinaChengdu 611731China School of Physical and Mathematical Sciences Nanyang Technological UniversitySingapore 637371Singapore Key Lab of Advanced Optoelectronic Quantum Architecture and Measurement(Ministry of Education) Beijing Key Lab of Nanophotonics&Ultraﬁne Optoelectronic Systemsand School of PhysicsBeijing Institute of TechnologyBeijing 100081China XJTU-Oxford International Joint Laboratory for Catalysis School of Chemical Engineering and TechnologyXi’an Jiaotong UniversityXi’an 710049China State Centre for International Cooperation on Designer Low-carbon and Environmental Materials(CDLCEM) School of Materials Science and EngineeringZhengzhou UniversityZhengzhou 450001China

The recombination of charge carriers arriving from the random charge movement in semiconductor pho-tocatalysts greatly limits the practical application of solar-driven H_(2)*** design of photo-catalytic systems with spatially oriented charge-transfer is a promising route to achieve high charge-separation efficiency for ***,novel sea-urchin-like Re S_(2)nanosheet/TiO_(2)nanoparticle heterojunctions(SURTHs)are *** unique sea-urchin-like structure endows the ReS_(2)cocat-alyst with an unusual charge edge-collection effect,which leads to a significant acceleration of charge separation and transfer,as evidenced by the well-designed selective photodeposition of Pt quantum dots in *** markedly improved charge transfer capacity contributes to a high photocatalytic H_(2)evo-lution rate of 3.71 mmol h^(−1)g^(−1)for SURTHs(an apparent quantum efficiency(AQE)of 16.09%),up to 231.9 times by contrast with that of P25 TiO_(2).This work would provide a new platform for designing the high-efficiency cocatalyst/photocatalyst system with excellent charge transfer capacity.

关键词： Sea-urchin-like ReS_(2)nanosheets Charge edge-collection effect 2D planar edges/tips Charge transfer Photocatalytic H_(2)evolution

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Microstructure and Wear Resistance of Fe-Based Metallic Glass Coatings Prepared by Extreme High-Speed Laser Cladding

SSRN

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SSRN 2024年

作者： Wang, Kai Zhang, Cheng Qu, Fengsheng Liu, Lin Liu, Xue Institute of Materials China Academy of Engineering Physics Mianyang621908 China School of Materials Science and Engineering State Key Lab for Materials Processing and Die & Mould Technology Huazhong University of Science and Technology Wuhan430074 China

Fe-based metallic glass (MG) coatings draw great attentions due to their excellent wear resistance. The recently developed extreme high-speed laser cladding (EHLC) provides a promising method for their fabrication but limited by the strong tendency to crack. Besides that, the deep insight into the structure evolution and the failure mechanism of the coating is still lacked. Thus, the understanding of the crack origin and the prevention of crack are of great importance. In the present work, Fe-Mo-Cr-Y-C-B MG coatings with adjustable amorphous phase content were successfully fabricated by EHLC. The microstructure characterization of the coatings reveals that the cracks is main caused by the hard and brittle nanocrystalline phases precipitations of monoclinic Mo12Fe22C10 and (Fe, Cr)23C6 carbides in the heat affected zone. Therefore, the cracking of the coatings can be effectively reduced by increasing the amorphous phase content. Subsequently, the hardness distribution, wear performance and wear mechanism of the coatings were investigated. The results showed that increasing the amorphous phase content can effectively achieve low wear rate. The prepared Fe-Mo-Cr-Y-C-B MG coatings exhibit abrasion loss as low as 3.54·10-6 mm3·(N·m)-1, which is an order of magnitude lower than that of the 45# steel substrate. The wear of the coatings is primarily attributed to the fatigue wear accompanied with slighting oxidative wear. By suppressing the brittle precipitated crystalline phases in the coating, the fatigue wear can be reduced and the wear resistance of the coatings can be improved. The present work provides insights into the crack prevention and were performance improvement of the Fe-based MG coatings prepared by EHLC. © 2024, The Authors. All rights reserved.

关键词： Microstructure

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Concentrating Cao from Lunar Simulant by Calciothermic Reduction Process

SSRN

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SSRN 2023年

作者： Zhang, Jie Li, Detian Zhang, Yuankun He, Chengdan Feng, Sen Wang, Jin Li, Chengfang Wang, Yongjun Liu, Aimin Shi, Zhongning Key Laboratory for Ecological Metallurgy of Multimetallic Minerals Ministry of Education Liaoning Shenyang110819 China Science and Technology on Vacuum Technology and Physics Laboratory Lanzhou Institute of Physics Lanzhou730000 China State Key Laboratory of Rolling and Automation Northeastern University Shenyang110819 China

The lunar regolith can be utilized as raw materials for constructing lunar bases through the fabrication of lunar cement. However, the low CaO content in lunar regolith presents a challenge for producing silicate cement directly. This study explores enriching CaO in NEU-1 lunar soil simulant by calciothermic reduction. Non-isothermal differential scanning calorimetry analysis indicated that calcium reacted with Fe2O3, SiO2, and Al2O3 at approximately 808°C, 816°C, and 826°C, respectively. The reaction levels were 1.1, 1.6, and 0.8, with apparent activation energies of 941.6 kJ/mol, 965.17 kJ/mol, and 547.28 kJ/mol. The products obtained from the calciothermic reduction of NEU-1 lunar soil simulant were CaO, Ca2Si, and AlFe, as analyzed by XRD. Increasing the temperature was found to be beneficial to the reaction process, and a suitable reaction temperature of 850°C was determined. XPS analysis showed that the reduction rates of SiO2 and Al2O3 were 93.01% and 91.04%, respectively, at 850°C for 30 minutes. The CaO content in the product obtained by calciothermic reduction was 50.65%, which can be further increased to 81.16% after magnetic separation and roasting, and the CaO yield was 82.57%. These results demonstrate that the process has a significant CaO enrichment effect. © 2023, The Authors. All rights reserved.

关键词： Silica

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