检索结果-内蒙古大学图书馆

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

引用

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

来源：评论

学校读者我要写书评

暂无评论

Rational design of Fe-N-C electrocatalysts for oxygen reduction reaction:From nanoparticles to single atoms

引用

Nano Research 2022年第3期15卷 1753-1778页

作者： Mengru Sun Changli Chen Menghao Wu Danni Zhou Zhiyi Sun Jianling Fan Wenxing Chen Yujing Li Beijing Key Laboratory of Construction Tailorable Advanced Functional Materials and Green Applications Experimental Center of Advanced MaterialsSchool of Materials Science and EngineeringBeijing Institute of TechnologyBeijing 100081China Department of Physics and Engineering Technology Guilin Normal CollegeGuilin 541199China

As an alternative energy,hydrogen can be converted into electrical energy via direct electrochemical conversion in fuel *** important drawback of full cells is the sluggish oxygen reduction reaction(ORR)promoted by the high-loading of platinum-group-metal(PGM)***-N-C family has been received extensive attention because of its low cost,long service life and high oxygen reduction reaction activity in recent *** order to further enhance the ORR activity,the synthesis method,morphology regulation and catalytic mechanism of the active sites in Fe-N-C catalysts are *** paper reviews the research progress of Fe-N-C from nanoparticles to single *** structure-activity relationship and catalytic mechanism of the catalyst are studied and discussed,which provide a guidance for rational design of the catalyst,so as to promote the more reasonable design of Fe-N-C materials.

关键词： nanoparticle catalyst controlled structure regulation single atomic catalyst local atomic regulation synergistic effect

来源：评论

学校读者我要写书评

暂无评论

Observation of possible excitonic charge density waves and metal–insulator transitions in atomically thin semimetals

引用

Nature physics 2024年第4期20卷 597-602页

作者： Gao, Qiang Chan, Yang-Hao Jiao, Pengfei Chen, Haiyang Yin, Shuaishuai Tangprapha, Kanjanaporn Yang, Yichen Li, Xiaolong Liu, Zhengtai Shen, Dawei Jiang, Shengwei Chen, Peng Shenyang National Laboratory for Materials Science Shanghai Center for Complex Physics School of Physics and Astronomy Shanghai Jiao Tong University Shanghai China Institute of Atomic and Molecular Sciences Academia Sinica Taipei Taiwan Physics Division National Center for Theoretical Sciences Taipei Taiwan Shanghai Synchrotron Radiation Facility Shanghai Advanced Research Institute Chinese Academy of Sciences Shanghai China College of Engineering International Advanced Technology Program National Taiwan University of Science and Technology Taipei Taiwan Chinese Academy of Sciences Shanghai China National Synchrotron Radiation Laboratory University of Science and Technology of China Hefei China

In solids, the condensation of electron and hole pairs with finite momentum leads to an ordered state known as a charge density wave, in which the charge has spatial modulation. However, lattice symmetry breaking and the accompanying relocation of the ions, which changes the charge distribution, can also occur simultaneously, making it difficult to disentangle the origin of the transition. Here we demonstrate a condensed phase in low-dimensional HfTe2. Angle-resolved photoemission spectroscopy measurements reveal a metal–insulator transition upon lowering the temperature. The observation of an opening gap, the renormalization of the bands and the emergence of replica bands in the low-temperature regime suggests that a charge density wave formed in the ground state. Raman spectroscopy shows no sign of lattice distortion within the detection limit. A small amount of electron doping substantially raises the transition temperature due to a reduced screening effect and a more balanced carrier density for electrons and holes. Our results indicate that the formation mechanism of the charge density wave is consistent with the excitonic insulator phase in low-dimensional HfTe2 without any structural modification. © The Author(s), under exclusive licence to Springer Nature Limited 2024.

关键词： Charge density waves

来源：评论

学校读者我要写书评

暂无评论

Bismuth clusters pinned on TiO_(2) porous nanowires boosting charge transfer for CO_(2) photoreduction to CH_(4)

引用

Nano Research 2024年第3期17卷 1190-1198页

作者： Jiazhi Meng Kaiwen Wang Yang Wang Jiangping Ma Chaogang Ban Yajie Feng Bin Zhang Kai Zhou Liyong Gan Guang Han Danmei Yu Xiaoyuan Zhou College of Physics and Institute of Advanced Interdisciplinary Studies Chongqing UniversityChongqing 401331China School of Chemistry and Chemical Engineering Chongqing UniversityChongqing 401331China College of Materials Science and Engineering Chongqing UniversityChongqing 400044China Beijing Key Lab of Microstructure and Properties of Advanced Materials Beijing University of TechnologyBeijing 100124China Analytical and Testing Center Chongqing UniversityChongqing 401331China

Artificial photosynthesis in carbon dioxide(CO_(2))conversion into value-added chemicals attracts considerable attention but suffers from the low activity induced by sluggish separation of photogenerated carriers and the kinetic bottleneck-induced unsatisfied ***,we prepare a new-style Bi/TiO_(2) catalyst formed by pinning bismuth clusters on TiO_(2) nanowires through being confined by pores,which exhibits high activity and selectivity towards photocatalytic production of CH_(4) from CO_(2).Boosted charge transfer from TiO_(2) through Bi to the reactants is revealed via in situ X-ray photon spectroscopy and time-resolved photoluminescence(PL).Further,in situ Fourier transform infrared results confirm that Bi/TiO_(2) not only overcomes the multi-electron kinetics challenge of CO_(2) to CH_(4) via boosting charge transfer,but also facilitates proton production and transfer as well as the intermediates*CHO and*CH_(3)O generation,ultimately achieving the tandem catalysis towards *** calculation also underlies that the more favorable reaction step from*CO to*CHO on Bi/TiO_(2) results in CH_(4) production with higher *** work brings new insights into rational design of photocatalysts with high performance and the formation mechanism of CO_(2) to CH_(4) for solar energy storage in future.

关键词： carbon dioxide(CO_(2))photoreduction charge transfer tandem catalysis methanation

来源：评论

学校读者我要写书评

暂无评论

Emerging monoelemental 2D materials(Xenes)for biosensor applications

引用

Nano Research 2023年第5期16卷 7030-7052页

作者： Xiaohan Duan Zhihao Liu Zhongjian Xie Ayesha Khan Tareen Karim Khan Bin Zhang Han Zhang Key Laboratory of Optoelectronic Devices Systems of Ministry of Education and Guangdong ProvinceCollege of Physics and Optoelectronic Engineering and Institute of Translational MedicineFirst Affiliated Hospital(Shenzhen Second People’s Hospital)Health Science CenterShenzhen UniversityShenzhen 518060China Institute of Pediatrics Shenzhen Children’s HospitalShenzhen 518038China School of Mechanical Engineering Dongguan University of TechnologyDongguan 523808China School of Electrical Engineering&Intelligentization Dongguan University of TechnologyDongguan 523808China

Currently,numerous monoelemental two-dimensional(2D)materials,called Xenes,have been discovered,including graphyne(GD),silicene,germanene,arsenene,*** structures,fabrication methods,as well as properties have been extensively *** on their single-element composition,high optical response capability,excellent electrical-optical properties,large specific surface area(SSA)and easy modification,Xenes have been widely used in photoelectric applications(detection,modulation,light processing)and biomedicine(biological sensing,drug loading,bioimaging,etc.).Especially in the field of biomedicine,Xenes are expected to induce a great *** this review,we introduce the structural characteristics,synthesis and modification methods of several common Xenes *** general properties including optical,electronic,physical and chemical properties of Xenes are *** diverse utilization as biosensors for nucleic acid sequencing,bioactive detection,cancer diagnosis,*** also explicitly ***,the challenges and future perspectives of Xenes in biosensor are discussed.

关键词： Xenes fabrication method general properties biosignal detection biosensors

来源：评论

学校读者我要写书评

暂无评论

Technologies and applications of silicon-based micro-optical electromechanical systems:A brief review

引用

Journal of Semiconductors 2022年第8期43卷 24-32页

作者： Shanshan Chen Yongyue Zhang Xiaorong Hong Jiafang Li Key Laboratory for Microstructural Material Physics of Hebei Province School of ScienceYanshan UniversityQinhuangdao 066004China Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement(Ministry of Education) Beijing Key Laboratory of Nanophotonics&Ultrafine Optoelectronic Systemsand School of PhysicsBeijing Institute of TechnologyBeijing 100081China Yangtze Delta Region Academy of Beijing Institute of Technology Jiaxing 314019China

Micro-optical electromechanical systems(MOEMS)combine the merits of micro-electromechanical systems(MEMS)and micro-optics to enable unique optical functions for a wide range of advanced *** simple external electromechanical control methods,such as electrostatic,magnetic or thermal effects,Si-based MOEMS can achieve precise dynamic optical *** this paper,we will briefly review the technologies and applications of Si-based *** basic working principles,advantages,general materials and micromachining fabrication technologies are introduced concisely,followed by research progress of advanced Si-based MOEMS devices,including micromirrors/micromirror arrays,micro-spectrometers,and optical/photonic *** to the unique advantages of Si-based MOEMS in spatial light modulation and high-speed signal processing,they have several promising applications in optical communications,digital light processing,and optical ***,future research and development prospects of Si-based MOEMS are discussed.

关键词： MOEMS Si-based micromachining technology micromirror micro-spectrometer optical switches

来源：评论

学校读者我要写书评

暂无评论

Low-cost contact-free screen control based on machine vision 4

Low-cost contact-free screen control based on machine vision

引用

4th Optics Frontier Conference, OFS 2024

作者： Lin, Yangbing Wang, Teng Yan, Wei Peng, Xiao Zhang, Xinhai Department of Electrical and Electronic Engineering Southern University of Science and Technology Shenzhen518055 China College of Physics and Optoelectronic Engineering Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province Shenzhen University Shenzhen518060 China School of Computer Science and Engineering South China University of Technology Guangzhou510641 China

ISBN: (纸本)9781510682269

Contact-free manipulation technology represents a novel approach that offers a fresh possibility for human-machine interaction, aiming to meet the evolving demands of this interface. In this paper, we introduce a contact-free planar display control technique based on imaging. In our research, we employ cameras as sensors and integrate infrared lasers with image processing techniques to detect and localize input signals. By establishing a coordinate mapping relationship between the operational plane and the display plane, we achieved contact-free control over the planar display. Our paper introduces two methods for establishing this coordinate mapping. The first involves constructing mapping functions between the rectified and transformed camera imagery and the display plane, thereby creating a point-to-point correspondence. The second method entails dividing both the camera imagery and the display plane into segments, establishing a one-to-one relationship between regions. We analyze the strengths and limitations of these two approaches. While the former boasts higher theoretical precision, it is more susceptible to equipment factors and exhibits slower response speeds. Conversely, the latter, despite its lower theoretical precision, offers faster response times. Through the setup of an experimental platform, we demonstrate the feasibility of our proposed. © 2024 SPIE.

关键词： Machine vision

来源：评论

学校读者我要写书评

暂无评论

A Machine Learning Perspective for the Optimization of Annealing Parameters in Solution Processed Thin Film Devices

A Machine Learning Perspective for the Optimization of Annea...

引用

International Symposium, Seminar, and Exhibition, Display Week 2024

作者： Wang, Jiankai Chen, Xi Wang, Xiao Xu, Lihai Tan, Shuhui Tang, Jun Chen, Wei Tang, Haodong College of Integrated Circuits and Optoelectronic Chips Shenzhen Technology University Shenzhen518118 China College of Engineering Physics Shenzhen Technology University Shenzhen518118 China School of Materials Science and Engineering Hubei University Wuhan430062 China School of New Materials and New Energies Shenzhen Technology University Shenzhen518118 China

This work adopts machine learning to refine the annealing process in solution-processed thin films, such as QDs, perovskites, and organic semiconductors. The annealing temperature and time of PbS QD thin film is optimized using a machine learning algorithm. This method offers a systematic approach to determine the optimal annealing parameters, surpassing the traditional, less-efficient methods. This adaptive model minimizes human bias, handles complex nonlinear relationships, and capable of optimizing multiple parameters simultaneously. By introducing machine learning algorithm, this method provides a universal and effective strategy for the optimization of parameters during the fabrication of thin films. © 2024, John Wiley and Sons Inc. All rights reserved.

关键词： Nanocrystals

来源：评论

学校读者我要写书评

暂无评论

Light-modulated Andreev effects in graphene-based superconducting junctions

引用

Physical Review B 2024年第15期110卷 155420页

作者： Miao Yu Deliang Cao Hong Wang Yafang Xu Fenghua Qi Xingfei Zhou Guojun Jin New Energy Technology Engineering Laboratory of Jiangsu Province School of Science College of Physics Science and Technology School of Electronic Engineering School of Physics Science and Technology National Laboratory of Solid State Microstructures Department of Physics and Collaborative Innovation Center of Advanced Microstructures

We investigate the transport properties, including Andreev reflection, 0−π transition, and crossed Andreev reflection, of graphene-based superconducting junctions modulated by an off-resonant circularly polarized light and a staggered sublattice potential. Using the Dirac-Bogoliubov–de Gennes equation and the Blonder-Tinkham-Klapwijk formula associated with numerical calculations, we can make the following findings. In a graphene-based normal conductor/superconductor (NS) junction, the differential conductance from Andreev reflection can be used to distinguish band structures. However, in a graphene-based superconductor/normal conductor/superconductor (SNS) junction, the valley polarization is induced and brings in a 0−π transition. Moreover, in a graphene-based normal conductor/superconductor/normal conductor (NSN) junction, the opposite valley polarization in two normal regions can lead to the pure and even perfect crossed Andreev reflections. The appreciable differential conductance of the pure crossed Andreev reflection is found for the 20–50 nm junction length, far less than the previous result in the graphene-based NSN junction, and it is helpful for the integration of superconducting quantum circuits. Our findings provide experimental possibilities to characterize the band structures, to realize the valley polarization-induced 0−π transition, and to design the valley-based highly efficient Cooper pair splitter in the light-modulated graphene-based superconducting junctions.

关键词： Andreev bound states Andreev reflection Josephson effect Graphene Superconducting devices Band structure methods Bogoliubov-de Gennes equations Tight-binding model

来源：评论

学校读者我要写书评

暂无评论

Cosmological constraints on neutrino mass within consistent cosmological models

引用

Chinese physics C 2024年第6期48卷 191-197页

作者：庞业煌张雪黄庆国 School of Fundamental Physics and Mathematical Sciences Hangzhou Institute for Advanced StudyUCASHangzhou 310024China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China CAS Key Laboratory of Theoretical Physics Institute of Theoretical PhysicsChinese Academy of SciencesBeijing 100190China Center for Gravitation and Cosmology College of Physical Science and TechnologyYangzhou UniversityYangzhou 225009China

Recently,the emergence of cosmological tension has raised doubts about the consistency of the ACDM *** constrain the neutrino mass within a consistent cosmological framework,we investigate three massive neutrinos with normal hierarchy(NH)and inverted hierarchy(IH)in both the axion-like early dark energy(AxiEDE)and AdS-EDE *** use joint datasets including the cosmic microwave background power spectrum from Plaanck 2018,Pantheon of type la supernova,baryon acoustic oscillation,and H0data from *** the vAxi-EDE model,we obtain∑m_(v),NH<0.152 eV and∑m_(v),IH<0.178 eV,whereas for the vAdS-EDE model,we find∑m_(v),NH<0.135 eV and∑m_(v),IH<0.167 *** results exhibit a preference for NH in both the vAxi-EDE and vAdS-EDE models.

关键词： neutrino mass cosmological tension early dark energy

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：