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Multiatom activation of single-atom electrocatalysts via remote coordination for ultrahigh-rate two-electron oxygen reduction

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Journal of Energy Chemistry 2023年第1期76卷 622-630,I0015页

作者： Xiaoqing Liu Rui Chen Wei Peng Lichang Yin De'an Yang Feng Hou Liqun wang Ji Liang Key Laboratory of Advanced Ceramics and Machining Technology of Ministry of Education School of Materials Science and EngineeringTianjin UniversityTianjin 300072China Shenyang national Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016LiaoningChina Applied physics Department College of Physics and Materials ScienceTianjin Normal UniversityTianjin 300387China

Electrocatalytic oxygen reduction via a two-electron pathway(2e^(-)-ORR)is a promising and eco-friendly route for producing hydrogen peroxide(H_(2)O_(2)).Single-atom catalysts(SACs)typically show excellent selectivity towards 2e^(-)-ORR due to their unique electronic structures and geometrical *** very low density of single-atom active centers,however,often leads to unsatisfactory H_(2)O_(2)yield rate,significantly inhibiting their practical *** this,we herein introduce fluorine as a secondary doping element into conventional SACs,which does not directly coordinate with the singleatom metal centers but synergize with them in a remote *** strategy effectively activates the surrounding carbon atoms and converts them into highly active sites for 2e^(-)-***,a record-high H_(2)O_(2)yield rate up to 27 mol g^(-1.h^(-1.has been achieved on the Mo–F–C catalyst,with high Faradaic efficiency of 90%.Density functional theory calculations further confirm the very kinetically facile 2e^(-)-ORR over these additional active sites and the superiority of Mo as the single-atom center to *** strategy thus not only provides a high-performance electrocatalyst for 2e^(-)-ORR but also should shed light on new strategies to significantly increase the active centers number of SACs.

关键词： Hydrogen peroxide Oxygen reduction reaction Two-electron pathway Remote coordination Electrocatalysis

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The Variability of the narrow-line Seyfert 1.Galaxies from the Pan-STARRS's View

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Research in Astronomy and Astrophysics 2022年第1期22卷 148-155页

作者： Hong-Tao wang Yan-Ping Su Xue Ge Yong-Yun Chen Xiao-Ling Yu school of Science Langfang Normal UniversityLangfang065000China school of Life Science Langfang Normal UniversityLangfang065000China school of {1. and electronic engineering Jiangsu Second Normal UniversityNanjingJiangsu 211200China The College of physics and {1. engineering Qujing Normal UniversityQujing655011China school of Astronomy and Space Science Nanjing UniversityNanjing210093China

By means of the data sets from the Pan-STARRS1.survey, we have systematically examined the relationship between the variability characteristics and the physical parameters of the largest nLS1.galaxy sample up to *** results are summarized as follows:(1.. We find significant anti-correlations between variability amplitude and absolute magnitude in g, r, i, z and y bands, which are consistent with the results in previous works.(2) The correlations between the variability amplitude in optical band and many physical parameters(e.g., λL(51.0 A),black hole mass, Eddington ratio, R;and R;) are investigated. The results show the variability amplitude is significantly anti-correlated with L(51.0 A), MBH, Eddington ratio and R_(4570), but positively correlated with R;.The relation could be explained by the simple standard accretion disk model.(3) We further investigate the relationship between optical variability and radio luminosity/radio-loudness. The results present weak positive correlation in g and r bands, but insignificant correlation in i, z and y bands. The large error of the approximate fraction of the host galaxy in i, z and y bands may lead to insignificant correlations.

关键词： catalogs galaxies:photometry galaxies:Seyfert

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柔性Pb_(0.99)Sm_(0.01.(Mg_(1.3)nb_(2/3))_(0.68)Ti_(0.32)O_(3)弛豫铁电薄膜储能特性

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硅酸盐学报 2024年第4期52卷 1301-1309页

作者：吕盼盼石长清辛乐战行张书志王佳李瑞航李存成任路超杨长红张明伟程新山东理工大学材料科学与工程学院山东淄博255000 山东理工大学分析测试中心山东淄博255000 淄博师范高等专科学校数理系山东淄博255130 济南大学山东省建筑材料制备与测试技术重点实验室济南250022

弛豫铁电薄膜电容器因具有细长电滞回线和高能量转化效率成为介电储能应用的理想选择。本工作采用溶胶凝胶法在沉积有LaniO3缓冲层的云母基底上直接制备了柔性Pb_(0.99)Sm_(0.01.(Mg_(1.3)nb_(2/3))_(0.68)Ti_(0.32)O_(3)(PSMnT)薄膜,... 详细信息

弛豫铁电薄膜电容器因具有细长电滞回线和高能量转化效率成为介电储能应用的理想选择。本工作采用溶胶凝胶法在沉积有LaniO3缓冲层的云母基底上直接制备了柔性Pb_(0.99)Sm_(0.01.(Mg_(1.3)nb_(2/3))_(0.68)Ti_(0.32)O_(3)(PSMnT)薄膜,系统研究了柔性PSMnT膜的微观结构、介电、铁电和储能性能。X射线衍射结果表明薄膜样品为单一钙钛矿相。扫描电子显微镜结果显示薄膜的晶粒尺寸均匀且致密。在极化特性方面,所制备的柔性PSMnT薄膜因具有弛豫性,其电滞回线呈现出纤细束腰特征,在外加电场2468 kV/cm下,其最大饱和极化为74.5μC/cm^(2),剩余极化为1..4μC/cm^(2)。薄膜电容器击穿前最大可释放能量密度和储能效率分为40.7 J/cm^(3)和70%,并且表现出较好的频率(1.20 kHz)和温度(25~1.0℃)稳定性。此外,样品借助云母衬底可实现优异的可弯折性,在弯曲半径R低至2 mm和弯曲疲劳循环1.00次(R=4 mm)后,其储能性能仍可保持。此研究表明以云母为基底的PSMnT弛豫薄膜在柔性储能领域具有很大的应用潜力。

关键词：铌镁酸铅钛酸铅基薄膜弛豫铁电体介电储能柔性

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新型激光光源在水稻育苗中的应用进展

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智能化农业装备学报（中英文） 2024年第3期5卷 22-32页

作者：杨明来秦莉贾鹏梁雪梅于合龙卞婷马强王辉李成龙 Sicheng TIAn 王英吉林农业大学信息技术学院吉林长春130118 吉林农业大学智慧农业学院吉林长春130118 浙江长芯光电科技有限公司浙江杭州310017 中国科学院长春光学精密机械与物理研究所吉林长春130033 国家特种发光科学与技术重点实验室吉林长春130033 阿贝光子学院德国耶拿07745 上海交通大学电子信息与电气工程学院上海市200240

水稻幼苗需要充足的光照才能正常生长,早春育苗的增温需求推动了温室、大棚和工厂化设施育苗的发展,但由于玻璃、塑料等棚膜材质对阳光的反射和吸收,设施育苗缺光问题凸显。补充光照可以较好解决设施育苗缺光问题,以LED为代表的补光光... 详细信息

水稻幼苗需要充足的光照才能正常生长,早春育苗的增温需求推动了温室、大棚和工厂化设施育苗的发展,但由于玻璃、塑料等棚膜材质对阳光的反射和吸收,设施育苗缺光问题凸显。补充光照可以较好解决设施育苗缺光问题,以LED为代表的补光光源已经在设施育苗中得到推广应用,但其依然存在能耗居高不下的问题。激光是人工光源中唯一与太阳光具有平行光特性的光源,具有相关性好、单色性好、方向性好、亮度高、能量大、光电转换效率高、节能等特点。但以氦氖激光为代表的传统激光光源体积大、成本高,难以在作物生长中应用和普及。采用半导体激光器结合匀光技术开发新型激光光源,体积小、成本低,可以实现对水稻秧苗的大面积均匀激光辐照,其单灯照射面积可以达到60~70 m^(2)。同时新型激光光源在保留传统激光相关性、单色性、方向性的同时,还具有高效节能的特点,能耗仅为传统LED光源1.30。研究表明,在水稻育苗过程中采用新型激光光源进行合理辐照,可以提升秧苗品质,插秧后返青快,分蘖多,抽穗早,最终实现水稻的稳产、增产。自2021.以来在全国多地试验结果表明,采用新型激光光源在插秧前辐照水稻秧苗20 d左右,可以实现超过1.%的增产。这一结果不仅为我国水稻提质增效提供了重要的技术支撑和保障,也为其他植物在各阶段补光提供了新的方法和手段。

关键词：激光光源植物补光水稻育苗弱激光光调控

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Constraints on the kinetic energy of type-Ic supernova explosion from young PSR J1.06+0746 in a double neutron star candidate

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Chinese physics B 2021年第6期30卷 721-726页

作者： Yi-Yan Yang Cheng-Min Zhang Jian-Wei Zhang De-Hua wang school of {1. and electronic Sciences Guizhou Education UniversityGuiyang 550018China CAS Key Laboratory of FAST National Astronomical ObservatoriesChinese Academy of Sciences(CAS)Beijing 100012China Astronomy Department Beijing Normal UniversityBeijing 100875China school of {1. and electronic Sciences Guizhou Normal UniversityGuiyang 550001China

So far among the nineteen pairs of detected double neutron star(DnS) systems, it is a usual fact that the first-born recycled pulsar is detected, however the youngest DnS system PSR J1.06+0746, with the characteristic age of 1.3 kyr, is one of the three detected DnS as a non-recycled and second-born nS, which is believed to be formed by an electron capture or a low energy ultra-stripped iron core-collapse supernova(Sn) explosion. The Sn remnant around PSR J1.06+0746 is too dim to be observed by optical telescopes, then its x-ray flux limit has been given by Chandra. A reference pulsar PSR J1.09-5850 with the young characteristic age of 1.4 kyr was chosen as an object of comparison, which has an Sn remnant observed by Chandra and is believed to be formed by iron core Sn explosion. We impose a restriction on the maximum kinetic energy of electron-capture(EC) Sn explosion that induces the formation of PSR J1.06+0746. The estimated result is(4–8)×1.^(50) erg(1.erg= 1.-7 J), which is consistent with that of the published simulations of the EC process, i.e., a lower value than that of the conventional iron core Sn explosion of(1.2)×1.^(51. erg. As suggested, EC process for nS formation is pertained to the subluminous type Ic Sn by the helium star with OneMg core, thus for the first time we derived the kinetic energy of EC Sn explosion of DnS, which may be reconciled with the recent observation of type Ic Sn 201. ft with kinetic energy of 2 × 1.^(50) erg.

关键词： neutron star pulsar astrophysics high energy astrophysical phenomena

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Two-dimensional MgSiP_(2) with anisotropic electronic properties and good performances for na-ion batteries

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Chinese Chemical Letters 2021年第3期32卷 1081-1085页

作者： Chunying Pu Jiahui Yu Ling Fu Jia wang Houyong Yanga Dawei Zhou Chaozheng He Institute of Environment and Energy Catalysis School of Materials Science and Chemical EngineeringXi’an Technological UniversityXi’an 710021China College of physics and {1. engineering Nanyang Normal UniversityNanyang 473061China Shaanxi Key Laboratory of Optoelectronic Functional Materials and Devices School of Materials Science and Chemical EngineeringXi'an Technological UniversityXi'an 710021China

Using the global particle-swarm optimization method and density functional theory,we predict a new stable two-dimensional layered material:MgSiP_(2)with a low-buckled honeycomb *** HSE06 calculation shows that MgSiP_(2)is an indirect-gap semiconductor with a band-gap of 1.20 eV,closed to that of bulk *** remarkably,MgSiP_(2)exhibits worthwhile anisotropy along with electron and hole carrier mobility.A ultrahigh electron mobility is even up to 1.29×1.^(4)cm^(2)V^(-1.s^(-1..while the hole mobility is nearly zero along the a *** large difference of the mobility between electron and hole together with the suitable band-gap suggest that MgSiP_(2)may be a good candidate for solar cell or photochemical catalysis ***,we explore MgSiP_(2)as an anode for sodium-ion batte *** na adsorption,the semiconducting MgSiP_(2)transforms to a metallic state,ensuring good electrical conductivity.A maximum theoretical capacity of 1.06 mAh/g,a small volume change(within 9.5%),a small diffusion barrier(~0.1. eV)and low average open-circuit voltages(~0.1. V)were found fo r MgSiP_(2)as an anode for sodium-ion *** results are helpful to deepen the understanding of MgSiP_(2)as a nanoelectronic device and a potential anode for na-ion batteries.

关键词： First-principles calculations Two-dimensional MgSiP_(2) Anode materials Sodium-ion batteries Carrier mobility

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An Improved Room-Temperature Silicon Terahertz Photodetector on Sapphire Substrates

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Chinese physics Letters 2019年第9期36卷 87-90页

作者： Xue-Hui Lu Cheng-Bin Jing Lian-Wei wang Jun-Hao Chu Key Laboratory of Polar Materials and Devices(Ministry of Ed ucation) Institute of Functional MaterialsDepartment of MaterialsSchool of Physics and Electronic ScienceEast China Normal UniversityShanghai 200241 Shanghai Institute of Jn elligen'Electronics&SystemsFudan UniversityShanghai 200433 State Key Laboratory of Infrared physics Shanghai Institute of Technical PhysicsChinese Academy of SciencesShanghai 200083

We design and fabricate a good performance silicon photoconductive terahertz detector on sapphire substrates at room *** best voltage responsivity of the detector is 6679 V/W at frequency 300 GHz as well as low voltage noise of 3.8 nV/Hz1.2 for noise equivalent power 0.57 pW/Hz1.*** measured response time of the device is about 9μs,demonstrating that the detector has a speed of>1.0 *** achieved good performance,together with large detector size(acceptance area is 3μm×1.0μm),simple structure,easy manufacturing method,compatibility with mature silicon technology,and suitability for large-scale fabrication of imaging arrays provide a promising approach to the development of sensitive terahertz room-temperature detectors.

关键词： Sapphire

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Enhanced rectification, transport property and photocurrent generation of multilayer ReSe2/MoS2 p-n heterojunctions

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nano Research 2016年第2期9卷 507-516页

作者： Xiaoting wang Le Huang Yuting Peng nengjie Huo Kedi Wu Congxin Xia Zhongming Wei Sefaattin Tongay Jingbo Li State Key Laboratory of Superlattices and Microstructures Institute of semiconductors Chinese Academy of Sciences RO. Box 9/2 Beijing 100083 China physics and {1. engineering College Henan Normal University Xinxiang 453007 China school for {1. of Matter Transport and Energy Arizona State University Tempe Arizona 85287 USA

Van der Waals （vdW） heterojunctions are equipped to avert dangling bonds due to weak, inter-layer vdW force, and ensure strong in-plane covalent bonding for two-dimensional layered structures. We fabricated four heterojunctions devices of different layers based on p-type distorted 1.-MX2 ReSe2 and n-type hexagonal MoS2 nanoflakes, and measured their electronic and optoelectronic properties. The device showed a high rectification coefficient of 500 for the diode, a high On/OFF ratio and higher electron mobility for the field-effect transistor （FET） compared with the individual components, and a high current responsivity （Rλ） and external quantum efficiency （EQE） of 6.75 A/W and 1.266%, respectively, for the photodetector.

关键词： ReSe2/MoS2 van der Waals heterojuncfion rectification optoelectronic properties

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Statistical properties of fast radio bursts elucidate their origins:magnetars are favored over gamma-ray bursts

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Research in Astronomy and Astrophysics 2021年第8期21卷 285-292页

作者： Xiang-Han Cui Cheng-Min Zhang Shuang-Qiang wang Jian-Wei Zhang Di Li Bo Peng Wei-Wei Zhu Richard Strom na wang Qingdong Wu Chang-Qing Ye De-Hua wang Yi-Yan Yang Zhen-Qi Diao CAS Key Laboratory of FAST National Astronomical ObservatoriesChinese Academy of SciencesBeijing 100101China school of Astronomy and Space Science University of Chinese Academy of SciencesBeijing 100049China school of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China Xinjiang Astronomical Observatory Chinese Academy of SciencesUrumqi 830011China Department of Astronomy Beijing Normal UniversityBeijing 100875China nAOC-UKZn Computational Astrophysics Centre University of KwaZulu-NatalDurban 4000South Africa Key Laboratory of Radio Astronomy Chinese Academy of SciencesBeijing 100101China netherlands Institute for Radio Astronomy(ASTROn) Postbus 27990 AA Dwingeloothe Netherlands Astronomical Institute ‘Anton Pannekoek’ Faculty of Science University of Amsterdam1090 GE Amsterdamthe Netherlands TianQin Research Center for Gravitational physics Sun Yat-sen UniversityZhuhai 519082China school of {1. and electronic Sciences Guizhou Education UniversityGuiyang 550018China

Fast radio bursts(FRBs) are extremely strong radio flares lasting several milliseconds,most of which come from unidentified objects at a cosmological *** can be apparently repeating or *** this paper,we analyzed 1. repeaters and 1. non-repeating FRBs observed in the frequency bands of 400–800 MHz from Canadian Hydrogen Intensity Mapping Experiment(CHIME).We investigated the distributions of FRB isotropic-equivalent radio luminosity,considering the K ***,the luminosity distribution can be better fitted by Gaussian form than by *** on the above results,together with the observed FRB event rate,pulse duration,and radio luminosity,FRB origin models are evaluated and constrained such that the gamma-ray bursts(GRBs) may be excluded for the non-repeaters while magnetars or neutron stars(nSs) emitting the supergiant pulses are preferred for the *** also found the necessity of a small FRB emission beaming solid angle(about 0.1.sr) from magnetars that should be considered,and/or the FRB association with soft gamma-ray repeaters(SGRs) may lie at a low probability of about 1.%.Finally,we discussed the uncertainty of FRB luminosity caused by the estimation of the distance that is inferred by the simple relation between the redshift and dispersion measure(DM).

关键词： transients:fast radio bursts methods:statistical stars:magnetars

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Elastic, dynamical, and electronic properties of LiHg and Li3Hg： First-principles study

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Frontiers of physics 2018年第2期13卷 111-117页

作者： Yan wang Chun-Mei Hao Hong-Mei Huang Yan-Ling Li school of {1. and electronic engineering Jiangsu Normal University Xuzhou 221116 China

The elastic, dynamical, and electronic properties of cubic LiHg and Li3Hg were investigated based on first-principles methods. The elastic constants and phonon spectral calculations confirmed the mechanical and dynamical stability of the materials at ambient conditions. The obtained elastic moduli of LiHg are slightly larger than those of Li3Hg. Both LiHg and Li3Hg are ductile materials with strong shear anisotropy as metals with mixed ionic, covalent, and metallic interactions. The calculated Debye temperatures are 223.5 K and 230.6 K for LiHg and Li3Hg, respectively. The calculated phonon frequency of the T2g mode in Li3Hg is 326.8 cm-1. The p states from the Hg and Li atoms dominate the electronic structure near the Fermi level. These findings may inspire further experimental and theoretical study on the potential technical and engineering applications of similar alkali metal-based intermetallic compounds.

关键词： Li-Hg alloys elastic property phonon spectrum electronic structure

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