检索结果-内蒙古大学图书馆

Synthesis and characterizations of boron and nitrogen co-doped high pressure and high temperature large single-crystal diamonds with increased mobility

引用

Chinese Physics B 2021年第6期30卷 625-630页

作者： Xin-Yuan Miao Hong-An Ma Zhuang-Fei Zhang Liang-Chao Chen Li-Juan Zhou Min-Si Li Xiao-Peng Jia College of Physics Guangxi University of Science and TechnologyLiuzhou 545006China State Key Laboratory of Superhard Materials College of PhysicsJilin UniversityChangchun 130012China Key Laboratory of Material Physics of Ministry of Education and School of Physical EngineeringZhengzhou UniversityZhengzhou 450052China

We synthesized and investigated the boron-doped and boron/nitrogen co-doped large single-crystal diamonds grown under high pressure and high temperature(HPHT) conditions(5.9 GPa and 1290℃). The optical and electrical properties and surface characterization of the synthetic diamonds were observed and studied. Incorporation of nitrogen significantly changed the growth trace on surface of boron-containing diamonds. X-ray photoelectron spectroscopy(XPS) measurements showed good evident that nitrogen atoms successfully incorporate into the boron-rich diamond lattice and bond with carbon atoms. Raman spectra showed differences on the as-grown surfaces and interior between boron-doped and boron/nitrogen co-doped diamonds. Fourier transform infrared spectroscopy(FTIR) measurements indicated that the nitrogen incorporation significantly decreases the boron acceptor concentration in diamonds. Hall measurements at room temperature showed that the carriers concentration of the co-doped diamonds decreases, and the mobility increases obviously. The highest hole mobility of sample BNDD-1 reached 980 cm^(2)·V^(-1)·s^(-1), possible reasons were discussed in the paper.

关键词： high pressure and high temperature(HPHT) diamond growth of crystal boron and nitrogen codoped diamond

来源：评论

学校读者我要写书评

暂无评论

Space Charge Layer Eff ect in Sulfide Solid Electrolytes in All-Solid-State Batteries: In-situ Characterization and Resolution

引用

Transactions of Tianjin University 2021年第6期27卷 423-433页

作者： Wei He Lei Zhou Muhammad Khurram Tufail Pengfei Zhai Peiwen Yu Renjie Chen Wen Yang Key Laboratory of Cluster Science of Ministry of Education Beijing Key Laboratory of Photoelectronic/Electrophotonic Conversion MaterialsSchool of Chemistry and Chemical EngineeringBeijing Institute of TechnologyBeijing 100081China School of Material Science and Engineering Beijing Institute of TechnologyBeijing 100081China

All-solid-state lithium batteries(ASSLBs)have advantages of safety and high energy density,and they are expected to become the next generation of energy storage ***-based solid-state electrolytes(SSEs)with high ionic conduc-tivity and low grain boundary resistance exhibit remarkable practical ***,the space charge layer(SCL)eff ect and high interfacial resistance caused by a mismatch with the current commercial oxide cathodes restrict the develop-ment of sulfide SSEs and *** review summarizes the research progress on the SCL eff ect of sulfide SSEs and oxide cathodes,including the mechanism and direct evidence from high performance in-situ characterizations,as well as recent progress on the interfacial modification strategies to alleviate the SCL eff *** study provides future direction to stabilize the high performance sulfide-based solid electrolyte/oxide cathode interface for state-of-the-art ASSLBs and future all-SSE storage devices.

关键词： Sulfide-based solid electrolyte interfaces Space charge layer All-solid-state batteries

来源：评论

学校读者我要写书评

暂无评论

Recent advances on environmental corrosion behavior and mechanism of high-entropy alloys

引用

Journal of materials science & Technology 2021年第21期80卷 217-233页

作者： Yu Fu Jun Li Hong Luo Cuiwei Du Xiaogang Li Institute for Advanced Materials and Technology University of Science and Technology BeijingBeijingJ 00083China Key Laboratory for Corrosion and Protection of The Ministry of Education(MOE) Beijing100083China Beijing Advanced Innovation Center for Materials Genome Engineering University of Science and Technology BeijingBeijing100083China National Materials Corrosion and Protection Scientific Data Center Institute for Advanced Materials and TechnologyUniversity of Science and Technology BeijingBeijing100083China BRI Southeast Asia Network for Corrosion and Protection(MOE) Shunde Graduate School of University of Science and Technology BeijingFoshan528000China

In the past decade, the sudden rise of high-entropy alloys(HEAs) has become a research hotspot in the domain of metal materials. HEAs break through the design concept of traditional single-principal element alloys, and the four core effects, especially the high entropy and cocktail effects, make HEAs exhibit much better corrosion resistance than traditional corrosion-resistant metal materials, e.g., stainless steels, copper-nickel alloys, and high-nickel alloys. Currently, the corrosion resistance of HEAs causes great concern in the field of corrosion research. This article reviews the corrosion behavior and mechanism of HEAs in various aqueous solutions, revealing the correlation among the composition, microstructure and corrosion resistance of HEAs, and elaborates the influence of heat treatment, anodizing treatment and preparation methods on the corrosion behavior of HEAs. This knowledge will benefit the on-demand design of corrosion-resistant HEAs, which is an important trend of future development. Finally, perspectives regarding the corrosion research of HEAs are outlined to guide future studies.

关键词： High-entropy alloys Corrosion behavior Corrosion mechanism Passive film Alloy design

来源：评论

学校读者我要写书评

暂无评论

Regulated adsorption sites using atomically single cluster over biochar for efficient elemental mercury uptake

引用

Biochar 2023年第1期5卷 258-272页

作者： Jiaxing Li Hongli Li Haomiao Xu Qinyuan Hong Leipeng Ji Zhisong Liu Yixiang Qiu Wenjun Huang Naiqiang Yan Zan Qu School of Environmental Science and Engineering Shanghai Jiao Tong University800 Dongchuan RoadShanghai 200240China Shanghai Institute of Pollution Control and Ecological Security Shanghai 200092China Key Laboratory of Magnetism and Magnetic Materials of the Ministry of Education School of Physical Science and Technology and ElectronMicroscopy Centre of Lanzhou UniversityLanzhou UniversityLanzhou 730000People’s Republic of China School of Chemistry and Chemical Engineering Shanghai Jiao Tong University800 Dongchuan RoadShanghai 200240China

Carbon-based materials have been widely used in gaseous pollutant removal because of their sufficient surface functional groups;however,its removal efficiency for elemental mercury(Hg^(0))is *** this study,we fabricated biomass using a chelated coupled pyrolysis strategy and further constructed the regulated adsorption sites for gaseous Hg^(0) uptake.A series of Mnδ-N_(2)O_(2)/BC with different manganese cluster sizes demonstrated that manganese clusters anchored on biochar acted as highly active and durable adsorbents for Hg^(0) immobilization,which increased the adsorption efficiency of Hg^(0) by up to 50%.Shrimp-and crab-based biochar adsorbents exhibited excellent Hg^(0) removal because of their chitosan-like *** particular,small Mn clusters and oxygen species around the defect led to a boost in the Hg^(0) adsorption by *** results of density functional theory calculation revealed that the presence of oxygen in the carbon skeleton can tune the electrons of small-sized Mn clusters,thereby promoting the affinity of mercury *** newly developed Mnδ-N_(2)O_(2)/BC_(shrimp) had an adsorption capacity of 7.98-11.52 mg g^(−1) over a broad temperature range(50-200℃)and showed a high tolerance to different industrial flue gases(H_(2)O,NO,HCl,and SO_(2)).These results provide novel green and low-carbon disposal methods for biomass resource utilization and industrial Hg^(0) emission control.

关键词： Biomass Heteroatoms Manganese clusters Elemental mercury Waste recycling

来源：评论

学校读者我要写书评

暂无评论

Identification and semisynthesis of(-)-anisomelic acid as oral agent against SARS-CoV-2 in mice

引用

National science Review 2022年第11期9卷 29-36页

作者： Hai-Xin Yu Nan Zheng Chi-Tai Yeh Chien-Ming Lee Qi Zhang Wen-Lv Zheng Qing Chang Yuan-He Li Yu-Jun Li Gui-Zhen Wu Jun-Min Quan Lin-Qi Zhang Yew-Min Tzeng Zhen Yang Laboratory of Chemical Genomics School of Chemical Biology and Biotechnology Peking University Shenzhen Graduate School Department of Medicinal Research and Education Taipei Medical University-Shuang Ho Hospital Department of Applied Science Taitung University Center for Global Health and Infectious Diseases Comprehensive AIDS Research Center and Beijing Advanced Innovation Center for Structural Biology School of Medicine Tsinghua University Lanzhou Institute of Separation Science State Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education and Beijing National Laboratory for Molecular Science(BNLMS) College of Chemistry and Molecular EngineeringPeking University Shenzhen Bay Laboratory NHC Key Laboratory of Biosafety National Institute for Viral Disease Control and Prevention Chinese Center for Disease Control and Prevention Department of Applied Chemistry Chaoyang University of Technology

(-)-Anisomelic acid, isolated from Anisomeles indica(L.) Kuntze(Labiatae) leaves, is a macrocyclic cembranolide with a trans-fused α-methylene-γ-lactone motif. Anisomelic acid effectively inhibits SARS-Co V-2 replication and viral-induced cytopathic effects with an EC50 of 1.1 and 4.3 μM, *** studies of SARS-CoV-2-infected K18-hACE2 mice showed that oral administration of anisomelic acid and subcutaneous dosing of remdesivir can both reduce the viral titers in the lung tissue at the same level. To facilitate drug discovery, we used a semisynthetic approach to shorten the project timelines. The enantioselective semisynthesis of anisomelic acid from the naturally enriched and commercially available starting material(+)-costunolide was achieved in five steps with a 27% overall *** developed chemistry provides opportunities for developing anisomelic-acid-based novel ligands for selectively targeting proteins involved in viral infections.

关键词： identification enantioselective semisynthesis (−)-anisomelic acid oral agent anti-SARS-CoV-2

来源：评论

学校读者我要写书评

暂无评论

A multi-step induced strategy to fabricate core-shell Pt-Ni alloy as symmetric electrocatalysts for overall water splitting

引用

Nano Research 2022年第2期15卷 965-971页

作者： Wenjuan Xu Jinfa Chang Yinggang Cheng Hongqi Liu Jifan Li Yongjian Ai Zenan Hu Xinyue Zhang Yiming Wang Qionglin Liang Yang Yang Hongbin Sun Department of Chemistry Northeastern UniversityShenyang 110819China NanoScience Technology Center Department of Materials Science and EngineeringUniversity of Central FloridaOrlandoFL 32826USA Key Laboratory of Bioorganic Phosphorus Chemistry&Chemical Biology(Ministry of Education) Department of ChemistryCenter for Synthetic and Systems BiologyTsinghua UniversityBeijing 100084China

Devising an electrocatalyst with brilliant efficiency and satisfactory durability for hydrogen production is of considerable demand,especially for large-scale ***,we adopt a multi-step consequential induced strategy to construct a bifunctional electrocatalyst for the overall water *** oxide(GO)was used as a carbon matrix and in situ oxygen source,which was supported by the octahedral PtNi alloy to form the PtxNiy-GO *** calcinating in Ar atmosphere,the oxygen in GO induced the surface segregation of Ni from the PtNi octahedron to form a core-shell structure of Ptx@***,the surface-enriched Ni continuously induced the reformation of C in reduced graphene oxide(rGO)to enhance the degree of *** multi-step induction formed a nanocatalyst Pt_(x)@Ni_(y)-rGO which has very high catalytic efficiency and *** optimizing the feeding ratio of PtNi(Pt:Ni=1:2),the electrolytic overall water splitting at 10 mA·cm^(-2) can be driven by an electrolytic voltage of as low as 1.485 V,and hydrogen evolution reaction(HER)only needs an overpotential of 37 mV in 1.0 M KOH aqueous ***,the catalyst exhibited consistent existence form in both HER and oxygen evolution reaction(OER),which was verified by switching the anode and cathode of the cell in the electrolysis of *** work provides a new idea for the synthesis and evaluation of the bifunctional catalysts for water splitting.

关键词： continuous induction core-shell structured Pt@Ni graphene oxide hydrogen evolution reaction alkaline water splitting

来源：评论

学校读者我要写书评

暂无评论

Ptzn/Zno Intermetallic Catalyst Prepared by Reactive Metal-Support Interaction for the Semi-Hydrogenation of 1,4-Butynediol

SSRN

引用

SSRN 2024年

作者： Chen, Xiao Meng, Longwei Fu, Huiyu Zhou, Quan Liang, Changhai State Key Laboratory of Fine Chemicals Laboratory of Advanced Materials and Catalytic Engineering School of Chemical Engineering Dalian University of Technology Dalian116024 China Key Laboratory of Biotechnology and Bioresources Utilization of Ministry of Education College of Life Science Dalian Minzu University Dalian116600 China

The continuous flow selective hydrogenation of 1,4-butynediol to 2-butene-1,4-diol places high demands on the activity and stability of the catalyst. Herein, an intermetallic PtZn/ZnO catalyst is designed by using the coupling strategy of strong electrostatic adsorption and following reactive metal-support interaction. The TOF value of the Pt/ZnO-H500 catalyst including PtZn intermetallic compound with electron-rich Ptδ- active sites reaches 16.2 h-1, which is almost 9 times higher than that of Pt/ZnO-H200 catalyst with monometallic Pt as active sites. The activation energy of Pt/ZnO-H500 catalyst (35.5 kJ mol-1) is significantly lower than that of Pt/ZnO-H200 catalyst with 49.9 kJ mol-1. In addition, the Pt/ZnO-H500 presents high stability in the continuous flow selective hydrogenation of 1,4-butynediol to 2-butene-1,4-diol for 75 h. These results suggest the intermetallic PtZn/ZnO presents as an alternative Pt-based catalyst with modifying by toxic metals or organic matters and is a promising catalyst for directional hydrogenation in fine chemical synthesis. © 2024, The Authors. All rights reserved.

关键词： Zinc alloys

来源：评论

学校读者我要写书评

暂无评论

Electrodeposition of Magnesium in Deep Eutectic Solvents Based on Magnesium Chloride Hexahydrate and Choline Chloride with Urea Added 3

Electrodeposition of Magnesium in Deep Eutectic Solvents Bas...

引用

2023 3rd International Conference on Frontiers of Electrical Power and Energy Systems, EPES 2023

作者： Chen, Qing Wang, Qian Lu, Shenghua Ecological and Environmental Protection Company China South-to-North Water Diversion Corporation Limited Beijing100036 China Key Laboratory of Cluster Science Ministry of Education of China Beijing Key Laboratory of Photoelectronic/Electrophotonic Conversion Materials School of Chemistry Beijing Institute of Technology Beijing100081 China Beijing Key Laboratory of Ionic Liquids Clean Process Key Laboratory of Green Process and Engineering State Key Laboratory of Multiphase Complex Systems Institute of Process Engineering Chinese Academy of Sciences Beijing100190 China Investment Company China Construction Fourth Engineering Division Corp. Ltd. Guangzhou510665 China

Magnesium (Mg) alloy has small density, large elastic modulus, good heat dissipation and corrosion resistance to organic matter and alkali. At present, magnesium alloy is more and more used in automotive industry, medical devices and aerospace industry. However, the traditional preparation method of Mg has the disadvantages of high investment, high labor intensity and great environmental pollution. Therefore, it is of great significance to develop simple, environment-friendly methods of the magnesium. In this study, urea was added to adjust the electrochemical property of the deep eutectic solvent (DES) mixed by choline chloride (ChCl) and magnesium chloride hexahydrate (MgCl2·6H2O). Cyclic Voltammetry (CV) curves reveals that the addition of urea made the reduction potential of Mg shifted from -0.9 V to -1.3 V. Among the CV curves, one was proposed as the "dividing line", which shows that the electroactive species in the two DESs, ChCl-MgCl2·6H2O and urea-MgCl2·6H2O, are different due to the changes of the component of the DESs. Fourier transform infrared (FTIR) data shows the type of hydrogen bond had been changed with the increase of urea content. Furthermore, the Raman spectra indicates that Mg2+ was coordinated with urea chains, which did not exist in ChCl-MgCl2·6H2O. Moreover, it was found that urea changed the electrochemical performance of the ChCl-Urea-MgCl2·6H2O by changing the hydrogen bond in the system and coordination form of the electroactive species, rather than adsorbing onto the electrode surface. Combined with geometry calculations at the B3LYP/6-311++G (d, p), the most probable mechanism of electrodeposition process was deduced. © Published under licence by IOP Publishing Ltd.

关键词： Cyclic voltammetry

来源：评论

学校读者我要写书评

暂无评论

基于晶体塑性的辐照金属材料局部化颈缩和吕德斯带的模拟研究

引用

Acta Mechanica Sinica 2023年第4期39卷 132-146页

作者：付家琪刘文斌隋昊男程杨洋段慧玲 State Key Laboratory for Turbulence and Complex System Department of Mechanics and Engineering ScienceThe Beijing Innovation Center for Engineering Science and Advanced TechnologyCollege of EngineeringPeking UniversityBeijing100871China Key Laboratory of High Energy Density Physics Simulation Center for Applied Physics and Technologyand Inertial Fusion Sciences and ApplicationsCollaborative Innovation Center of Ministry of EducationPeking UniversityBeijing100871China

金属材料中,颈缩失稳通常由表面缺陷或材料不均匀性等潜在扰动引起并随着微结构的演化进一步发展.本文将构型扰动法与考虑辐照效应的晶体塑性本构关系相结合,模拟了辐照前后局部化颈缩和吕德斯带等现象.通过考虑模拟局部化变形中扰动的... 详细信息

金属材料中,颈缩失稳通常由表面缺陷或材料不均匀性等潜在扰动引起并随着微结构的演化进一步发展.本文将构型扰动法与考虑辐照效应的晶体塑性本构关系相结合,模拟了辐照前后局部化颈缩和吕德斯带等现象.通过考虑模拟局部化变形中扰动的必要性,发现了外在的几何缺陷和内禀的微结构演化在颈缩过程中的竞争关系.此外,以纯金属铜和奥氏体不锈钢为例研究了辐照硬化效应对颈缩失稳的影响.结果表明,流动应力的增加和功硬化能力的降低是均匀延伸率下降的原因,辐照效应导致的织构软化作用可以忽略.为了解释辐照后低碳钢下屈服点和吕德斯应变同时增加的现象,一种位错脱钉扎和位错与辐照缺陷的交互作用相耦合的塑性变形机制被提出并结合修正的流动方程,很好地模拟出包含屈服下降、应力平台、应变扩展和应变硬化等特征的吕德斯带现象.其中,位错与辐照缺陷的相互作用也可以解释辐照后纯金属材料中发现的扩散颈缩现象.我们的模拟结果既阐明了几何缺陷在颈缩失稳中的重要作用,也为辐照金属中常见的宏观塑性失稳现象提供了清晰的物理图像.

关键词：吕德斯带金属材料奥氏体不锈钢晶体塑性下屈服点流动应力几何缺陷均匀延伸率

来源：评论

学校读者我要写书评

暂无评论

Step Site-Specific Semihydrogenation of Acetylene on the Au Surface

引用

Journal of Physical Chemistry Letters 2022年第33期13卷 7667-7672页

作者： Wu, Zongfang Wang, Fang Sun, Guanghui Xiong, Feng Teng, Botao Huang, Weixin Hefei National Laboratory for Physical Sciences at the Microscale Collaborative Innovation Center of Chemistry for Energy Materials Key Laboratory of Surface and Interface Chemistry and Energy Catalysis Anhui Higher Education Institutes Department of Chemical Physics University of Science and Technology of China Hefei 230026 China Tianjin Key Laboratory of Brine Chemical Engineering and Resource Eco-utilization College of Chemical Engineering and Materials Science Tianjin University of Science and Technology Tianjin 300457 China Key Laboratory of Mesoscopic Chemistry of Ministry of Education Collaborative Innovation Center of Chemistry for Life Sciences School of Chemistry and Chemical Engineering Nanjing University Nanjing 210023 China Dalian National Laboratory for Clean Energy Chinese Academy of Sciences Dalian 116023 China

Supported Au catalysts are highly selective and size-sensitive in catalytic hydrogenation of alkynes under mild conditions. Using thermal-programmed desorption and density functional theory calculations, we study the hydrogenation reactions of C2 hydrocarbons with atomic H and clarify the site-specific selective hydrogenation of C2H2 on Au(997) at low temperatures. On atomic H(a) covered Au(997), hydrogenation of C2H2 goes with 100% selectivity to C2H4 at steps, yet no hydrogenation occurs at terraces;adsorbed C2H4 on neither steps nor terraces reacts with H(a). DFT calculations suggest that the increased adsorption free energies and appropriate reaction barriers of C2 species at steps lead to the step-site specific semihydrogenation of C2H2. These results elucidate the elementary surface reactions between C2 hydrocarbons and atomic H on Au surfaces at the molecular level and significantly deepen the fundamental understanding of the unique selectivity of Au catalysts. © 2022 American Chemical Society.

关键词： Adsorption Desorption Gold Hydrocarbons Hydrogenation

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：