检索结果-南通市图书馆

Journal of Materials Science & Technology 2020年第3期38卷 221-236页

作者： Mengmeng Zhang Xiaopeng Li Jun Zhao Xiaopeng Han Cheng Zhong Wenbin Hu Yida Deng School of Materials Science and Engineering Tianjin Key Laboratory of Composite and Functional MaterialsKey Laboratory of Advanced Ceramics and Machining Technology(Ministry of Education)Tianjin UniversityTianjin 300072China Joint School of National University of Singapore and Tianjin University International Campus of Tianjin UniversityBinhai New CityFuzhou 350207China

Surface/interface engineering plays an important role in improving the performance and economizing the cost and usage of electrocatalysts.In recent years,substantial progress has been achieved in designing and developing highly active electrocatalysts with the deepening understanding of surface and interface enhanced mechanism.In this review,recent development about optimizing the surface and interfacial structure in promoting the electrocatalytic activity of Noble-metals and transition metal compounds is presented and the chemical enhancements are also described in detail.The relationship between the surface/interface structures(both atomic and electronic configuration)and the electrochemical behaviors has been discussed.Finally,personal perspectives have been proposed,highlighting the challenges and opportunities for future development in tuning the surface/interface active sites of electrocatalysts.We believe that this timely review will be beneficial to the construction of highly active and durable electrode materials through optimizing surface atomic arrangement and interfacial interaction,which can largely promote the development of next-generation clean energy conversion technologies.

关键词： Surface/interface engineering Noble metals Transition metals compounds Electrocatalytic reactions

MXenes induce epitaxial growth of size-controlled Noble nanometals:A case study for surface enhanced Raman scattering(SERS)

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2020年第5期40卷 119-127页

作者： Renfei Cheng Tao Hu Minmin Hu Changji Li Yan Liang Zuohua Wang Hui Zhang Muchan Li Hailong Wang Hongxia Lu Yunyi Fu Hongwang Zhang Quan-Hong Yang Xiaohui Wang Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China University of Chinese Academy of Sciences Beijing 100049China National Engineering Research Center for Equipment and Technology of Cold Strip Rolling College of Mechanical EngineeringYanshan UniversityQinhuangdao 066004China Department of Materials Science and Engineering Monash UniversityClaytonVictoria 3800Australia Institute of Microelectronics Key Laboratory of Microelectronic Devices and CircuitsPeking UniversityBeijing 100871China School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450001China School of Chemical Engineering&Technology Tianjin UniversityTianjin 300072China

Noble nanometals are of significance in both scientific interest and technological applications,which are usually obtained by conventional wet-chemical synthesis.Organic surfactants are always used in the synthesis to prevent unexpected overgrowth and aggregation of Noble nanometals.However,the surfactants are hard to remove and may interfere with plasmonic and catalytic studies,remaining surfactant-free synthesis of Noble nanometals a challenge.Herein,we report an approach to epitaxial growth of sizecontrolled Noble nanometals on MXenes.As piloted by density functional theory calculations,along with work function experimental determination,kinetic and spectroscopic studies,epitaxial growth of Noble nanometals is initiated via a mechanism that involves an in situ redox reaction.In the redox,MXenes as two-dimensional solid reductants whose work functions are compatible with the reduction potentials of Noble metal cations,enable spontaneous donation of electrons from the MXenes to Noble metal cations and reduce the cations into nanoscale metallic metals on the outmost surface of MXenes.Neither surfactants nor external reductants are used during the whole synthesis process,which addresses a long-standing interference issue of surfactant and external reductant in the conventional wet-chemical synthesis.Moreover,the MXenes induced Noble nanometals are size-controlled.Impressively,Noble nanometals firmly anchored on MXenes exhibit excellent performance towards surface enhanced Raman scattering.Our developed strategy will promote the nanostructure-controlled synthesis of Noble nanometals,offering new opportunities to further improve advanced functional properties towards practical applications.

关键词： Two-dimensional materials MXene In situ redox Noble metal SERS

Synthesis and Crystal Structure of a New Noble Metalcontaining Supramolecular Self-assembly with Decamethylcucurbit[5]uril

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Structural Chemistry 2020年第3期39卷 535-542,379页

作者：陈茹茹杨炜光曹敏纳李红芳 College of Chemistry Fuzhou UniversityFuzhou 350002China State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002China

A new supramolecular self-assembly [Li(H2 O)2]2[(H2 O@Me10 CB[5])][PtC l6]·7 H2 O(1, Me10 CB[5] = decamethylcucurbit[5]uril), has been successfully constructed with Me10 CB[5] and [PtCl6]^(2-) anion in the presence of lithium cation(Li+). Single-crystal X-ray diffraction study reveals that compound 1 crystallizes in monoclinic space group P21/n with a = 11.1681(18), b = 28.5425(4), c = 18.9342(3) ?, β = 99.0143(15)°, V = 5961.02(16) ?~3, Z = 4, F(000) = 3224, μ = 2.714 mm^(-1), R = 0.0470 and wR = 0.1076(I > 2σ(I)). In the supramolecular self-assembly, two of the portal carbonyl oxygen atoms of Me10 CB[5] are coordinated to Li+ cation, yielding a "half-open" molecular capsule. Then adjacent molecular capsules are connected with each other through hydrogen-bonding to form a one-dimensional(1 D) supramolecular chain structure. The [PtCl6]^(2-) anions are fixed on one side of the 1 D supramolecular chain through supramolecular interactions. The thermal stability, electronic valence and morphology of compound 1 are also investigated.

关键词： decamethylcucurbituril Noble metal supramolecular self-assembly crystal structure

A perspective of chalcogenide semiconductor-Noble metal nanocomposites through structural transformations

在线全文

学校读者我要写书评

暂无评论

Nano Materials Science 2019年第3期1卷 184-197页

作者： Danye Liu Linlin Xu Jianping Xie Jun Yang State Key Laboratory of Multiphase Complex Systems Institute of Process EngineeringChinese Academy of SciencesBeijing100190China University of Chinese Academy of Sciences No.19A Yuquan RoadBeijing100049China Department of Chemical and Biomolecular Engineering National University of Singapore4 Engineering Drive 4117585Singapore Center for Mesoscience Institute of Process EngineeringChinese Academy of SciencesBeijing100190China Zhongke Langfang Institute of Process Engineering Fenghua Road No 1Langfang Economic&Technical Development ZoneHebei Province065001China

Intense efforts have been devoted to the synthesis of heterogeneous nanocomposites consisting of chalcogenide semiconductors and Noble metals,which usually exhibit enhanced properties owing to the synergistic effect between their different material domains.Tailoring the structure of the metal domains in the nanocomposites may lead to further improvements of its performance for a given application.This review therefore highlights the strategies based on a structural conversion process for the fabrication of nanocomposites consisting of chalcogenide semiconductors and Noble metals with various internal structures,e.g.,hollow or cage-bell.This strategy relies on a unique inside-out diffusion phenomenon of Ag in core-shell nanoparticles with Ag residing at core or inner shell region.In the presence of sulfur or selenium precursors,the diffused Ag are converted into Ag2S or Ag2Se,which is connected with the remaining Noble metal parts,forming nanocomposites consisting of silver chalcogenide and Noble metal nanoparticles with hollow or cage-bell structures.We would focus on the introduction of the fundamentals,principles,electrocatalytic applications as well as perspectives of the chalcogenide semiconductor-Noble metal nanocomposites derived from their core-shell precursors so as to provide the readers insights in designing efficient nanocomposites for electrocatalysis.

关键词： Nanocomposite Chalcogenide Noble metal Nanoparticle Structural conversion Electrocatalysis

Delving Noble metal and semiconductor nanomaterials into enantioselective analysis

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2019年第9期30卷 1565-1574页

作者： Yongting Wen Zheng Li Jianhui Jiang State Key Laboratory of Chemo/Bio-Sensing and Chemometrics College of Chemistry and Chemical Engineering Hunan University

With growing interests paid to the enantioselective analysis of chiral molecules, roles played by Noble metal and semiconductor nanomaterials surface gradually. Given the unique physicochemical properties of Noble metal and semiconductor nanomaterials, the enantioselective analyses are classified into three categories: fluorescence-based, colorimetry-based, and circular dichroism-based ones. In this paper, we review the existing progresses on enantioselective analysis, thanks to Noble metal and semiconductor nanomaterials. Finally, the prospect of enantioselective analysis based on Noble metal and semiconductor are discussed.

关键词： Enantiomers Noble metal nanomaterials Chiroplasmonic Semiconductor nanomaterials Chiroexcitonic Enantioselective analysis

Insight into excitation wavelength and hotspot effect of Noble metal nanoparticles dimer

在线全文

学校读者我要写书评

暂无评论

Optoelectronics Letters 2021年第10期17卷 577-580页

作者：马阿宁魏文静李国剑王玉荣耿迪张中强 School of Information Science and Engineering Lanzhou UniversityLanzhou 730000China China Mobile Communication Corporation Lanzhou 730000China School of Electrical Engineering Northwest Minzu UniversityLanzhou 730030China

A proper excitation wavelength and strong hot-spot effect are of great importance for the application of surface-enhanced Raman spectroscopy(SERS)in the field of biochemistry.As a popular SERS substrate,Noble metal nanoparticles dimer is analyzed systematically in this paper.The hot-spot effect and the resonance peak position with varying geometric parameters of metal nanoparticles are investigated.Moreover,the excitation wavelength of bimetallic structure is discussed as well.The conclusions can provide reference for the selection of metal material at different excitation wavelengths.

关键词： excitation Noble dimer

Covalent organic frameworks derived hollow structured N-doped Noble carbon for asymmetric-electrolyte Zn-air battery

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2019年第3期62卷 385-392页

作者： Pingwei Cai Xinxin Peng Junheng Huang Jingchun Jia Xiang Hu Zhenhai Wen CAS Key Laboratory of Design and Assembly of Functional Nanostructures Fujian Provincial Key Laboratory of Nanomaterials Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences University of Chinese Academy of Science

We report a relatively low-temperature molten salt strategy to prepare hollow structured N-doped Noble carbon(h-NNC) with highly desirable features of ultra-large surface area(1957 m^2 g^(-1)) and high graphitization, endowing the h-NNC with high activity toward catalysis of oxygen reduction reaction in acidic medium. The h-NNC is applied as cathode catalyst of an asymmetrical-electrolyte Zn-air battery, which exhibits an open circuit voltage of 2.11 V, a power density up to 270 mW cm^(-2),and an energy density of 1279 W h kg^(-1), behaving advantages over the conventional Zn-air batteries.

关键词： Noble carbon oxygen reduction reaction asvmmetric-electrolyte Zn-air battery energy density

In situ facile loading of Noble metal nanoparticles onpolydopamine nanospheres via galvanic replacement reaction for multifunctional catalysis

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2017年第9期60卷 1236-1242页

作者： Fang Wei Jian Liu Ya-Nan Zhu Xiao-Shi Wang Chang-Yan Cao Wei-Guo Song Laboratory of Molecular Nanostructures and Nanotechnology Institute of ChemistryChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China

Noble metal nanoparticles(Pd,Ag,Pt,Au) with small and relatively uniform sizes were loaded on polydopamine nanospheres through in situ galvanic replacement reaction in aqueous solution.No additional reductant,surfactant or organic solvent was needed.X-ray photoelectron spectroscopy results revealed that the amount of quinone increased,while the amount of phenolic hydroxyl decreased on PDA nanospheres,indicating that the galvanic displacement reaction occurred between catechol groups and Noble metal ions.The as-prepared PDA/Pd exhibited high catalytic activity and excellent stability in styrene hydrogenation.Moreover,PDA spheres retains the photo-thermal effect to serve as a nano-sized heater to accelerate the catalytic reactions under near-infrared illumination.

关键词： polydopamine, Noble metal, facile loading, multifunctional catalysis

Noble gas as a functional dopant in ZnO

在线全文

学校读者我要写书评

暂无评论

npj Computational Materials 2019年第1期5卷 822-827页

作者： Oleksandr I.Malyi Kostiantyn V.Sopiha Clas Persson Centre for Materials Science and Nanotechnology Department of PhysicsUniversity of OsloP.O.Box 1048BlindernNO-0316 OsloNorway Ångström Solar Center Solid State ElectronicsDepartment of Engineering SciencesUppsala UniversityBox 534SE-75121 UppsalaSweden

Owing to fully occupied orbitals,Noble gases are considered to be chemically inert and to have limited effect on materials properties under standard conditions.However,using first-principles calculations,we demonstrate herein that the insertion of Noble gas(i.e.He,Ne,or Ar)in ZnO results in local destabilization of electron density of the material driven by minimization of an unfavorable overlap of atomic orbitals of the Noble gas and its surrounding atoms.Specifically,the Noble gas defect(interstitial or substitutional)in ZnO pushes the electron density of its surrounding atoms away from the defect.Simultaneously,the host material confines the electron density of the Noble gas.As a consequence,the interaction of He,Ne,or Ar with O vacancies of ZnO in different charge states q(ZnO:VO^(q))affects the vacancy stability and their electronic structures.Remarkably,we find that the Noble gas is a functional dopant that can delocalize the deep in-gap VO^(q) states and lift electrons associated with the vacancy to the conduction band.

关键词： dopant Noble vacancy

生命中最美的时光韩国IB Noble Kids儿童教育机构

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

室内设计与装修 2019年第10期 106-110页

作者：小满 YM Design Studio

童年被认为是生命中最重要的时期之一,孩子在这一时期形成自己的文化、习惯和价值观,儿童时代建立的价值观会影响今后的生活。这个时期不光身体在发育,想象力、推理能力、判断能力和思考能力也在发展,这就是为什么儿童时期的教育很重要... 详细信息

童年被认为是生命中最重要的时期之一,孩子在这一时期形成自己的文化、习惯和价值观,儿童时代建立的价值观会影响今后的生活。这个时期不光身体在发育,想象力、推理能力、判断能力和思考能力也在发展,这就是为什么儿童时期的教育很重要。在锻炼身体能力和塑造价值观的时期,孩子们不能只背英语单词,孩子们要玩,还要好好玩。

关键词：儿童教育 IB Noble Kids