检索结果-南通市图书馆

Engineering single–atom active sites anchored covalent organic frameworks for efficient metallaphotoredox C-N cross–coupling reactions

引用

Science Bulletin 2022年第19期67卷 1971-1981页

作者： Zhuwei Li Shi Qiu Yurou Song Shiyu Huang Junfeng Gao Licheng Sun Jungang Hou State Key Laboratory of Fine Chemicals Frontiers Science Center for Smart Materials Oriented Chemical EngineeringSchool of Chemical EngineeringDalian University of TechnologyDalian 116024China Laboratory of Materials Modification by Laser Ion and Electron BeamsDalian University of TechnologyDalian 116024China Center of artificial photosynthesis for solar fuels and department of chemistry School of ScienceWestlake UniversityHangzhou 310024China department of chemistry School of Engineering Sciences in ChemistryBiotechnology and HealthKTH Royal Institute of TechnologyStockholm 10044Sweden

Photoredox catalysis has become an indispensable solution for the synthesis of small organic ***,the precise construction of single-atomic active sites not only determines the catalytic performance,but also avails the understanding of structure–activity ***,we develop a facile approach to immobilize single-atom Ni sites anchored porous covalent organic framework(COF)by use of 4,4',4''-(1,3,5-triazine-2,4,6-triyl)trianiline and 2,6-diformylpyridine(Ni SAS/TD-COF).Ni SAS/TDCOF catalyst achieves excellent catalytic performance in visible-light-driven catalytic carbon–nitrogen cross-coupling reaction between aryl bromides and amines under mild *** reaction provides amine products in excellent yields(71%–97%)with a wide range of substrates,including aryl and heteroaryl bromides with electron-deficient,electron-rich and neutral ***,Ni SAS/TD-COF could be recovered from the reaction mixture,corresponding to the negligible loss of photoredox performance after several *** work provides a promising opportunity upon rational design of single-atomic active sites on COFs and the fundamental insight of photoredox mechanism for sustainable organic transformation.

关键词： Single–atom active sites Covalent organic frameworks Photocatalysis C–N cross–coupling reaction Heterogeneous catalyst

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

分子氧条件下Co-ETS-10和Co-AM-6催化苯乙烯氧化生成氧化苯乙烯和苯甲醛（英文）

引用

催化学报 2015年第6期36卷 897-905页

作者： Shuvo Jit Datta Kyung Byung Yoon Korea Center for artificial photosynthesis Center for Nano Materials Department of Chemistry Sogang University

Pristine ETS-10 and AM-6 and their Co2+-exchanged forms were prepared, and their catalytic activities toward the oxidation of styrene in oxygen atmosphere were studied in dimethylformamide. The catalysts were denoted as Co-E10-n(n = 0, 9, 26, 68, 81) and Co-A6-m(m = 0, 8, 23, 63, 79), where n and m denote the degree of Co2+ exchange. The products of the oxidation process were identified as styrene epoxide(E) and benzaldehyde(B). Both the pristine forms, ETS-10(Co-E10-0) and AM-6(Co-A6-0), and Co2+-exchanged forms displayed catalytic activities. With increasing n or m, the conversion, and hence the rate, increased. Specifically, the rates varied from 6.1 to 12.5 mmol·g-1·h-1with increasing n(Co-E10-n catalysts) and from 5.4 to 12.4 mmol·g-1·h-1 with increasing m(Co-A6-m catalysts). In contrast, the E/B ratio decreased with increasing n or m. More specifically,the E/B ratio decreased from 2.1 to 0.1 with increasing n from 0 to 81(Co-E10-n catalysts) and from 1.3 to 0.1 with increasing m from 0 to 79(Co-A6-m catalysts). Co-E10-9 displayed the highest E yield and Co-A6-79 generated the highest B yield. The highest turnover frequency obtained was 36.3 Co-1·h-1, which was the highest one obtained among those obtained for the Co2+-exchanged zeolites and mesoporous silica reference materials studied in this work.

关键词：苯乙烯氧化物活性催化剂苯甲醛分子氧二甲基甲酰胺介孔二氧化硅二氧化碳 N催化剂

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Monolayer MoSi_(2)_N(4-x) as promising electrocatalyst for hydrogen evolution reaction: A DFT prediction

引用

Journal of Materials Science & Technology 2022年第4期99卷 215-222页

作者： Wangwang Qian Zhe Chen Jinfeng Zhang Lichang Yin 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 Center of artificial photosynthesis for solar fuels School of ScienceWestlake UniversityHangzhou 310024China department of Physics and Electronic Information Huaibei Normal UniversityHuaibei 235000China

The density functional theory(DFT)calculations have been performed to investigate the catalytic properties of monolayer MoSi_(2)N_(4) for hydrogen evolution reaction(HER).The DFT results show that similar to the majority of other two-dimensional(2D)materials,the pristine MoSi_(2)N_(4) is inert for HER due to its weak affinity toward hydrogen,while monolayer MoSi_(2)N_(4-x)(x=0–0.25)exhibits the highly desirable HER catalytic activities by introducing surface nitrogen vacancy(NV).The predicted HER overpotential(0–60 mV)of monolayer MoSi_(2)N_(4-x) is lower than that(90 mV)of noble metal Pt,when the concentration of surface NV is lower than 5.6%.Electronic structure calculations show that the spin-polarized states appear around the Fermi level after introducing surface NV,thus making the surface NV on 2D MoSi_(2)N_(4) a quite suitable site for ***,the HER activity of MoSi_(2)N_(4-x) is highly dependent on the surface NV concentration,which can be further related to the center of Si-3p *** results demonstrate that the newly discovered 2D MoSi_(2)N_(4) can be served as a promising electrocatalyst for HER via appropriate defect engineering.

关键词： Hydrogen evolution reaction Electrocatalyst 2D material MoSi_(2)N_(4) Surface nitrogen vacancy

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Water Splitting in Natural and artificial photosynthesis

Water Splitting in Natural and Artificial Photosynthesis

引用

中国化学会第二届全国光功能材料青年学者研讨会

作者：孙立成 Center of artificial photosynthesis for solar fuels School of Science Westlake University

Light driven water splitting to generate solar fuels is the key for green chemistry and sustainable society. Based on most important experimental results reported in the literature and our own understandings, a new proposal for the mechanism of water splitting in nature（PSII） with a full catalytic cycle will be presented. Inspired by this new proposal, a new strategy to synthesize advanced water splitting catalysts will be provided. Recent progress on photoelectrochemical（PEC） cells for water splitting and sustainable production of fine chemicals by using water as the oxygen and hydrogen source for respective oxygenation and hydrogenation of organic substrates will be demonstrated.

关键词：天然光合作用人工光合作用太阳能燃料水分解催化剂氧-氧健形成机理

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

A crosslinked polymer as dopant-free hole-transport material for efficient n-i-p type perovskite solar cells

引用

Journal of Energy chemistry 2021年第4期30卷 211-218页

作者： Linqin Wang Fuguo Zhang Tianqi Liu Wei Zhang Yuanyuan Li Bin Cai Lanlan He Yu Guo Xichuan Yang Bo Xu James M.Gardner Lars Kloo Licheng Sun Organic chemistry Centre of Molecular DevicesDepartment of ChemistryKTH Royal Institute of TechnologySE-10044 StockholmSweden Applied Physical chemistry Centre of Molecular DevicesDepartment of ChemistryKTH Royal Institute of TechnologySE-10044 StockholmSweden Wallenberg Wood Science centre Department of Fibre and Polymer TechnologyKTH Royal Institute of TechnologySE-10044 StockholmSweden State Key Laboratory of Fine Chemicals Institute of Artificial PhotosynthesisDUT-KTH Joint Education and Research Centre on Molecular DevicesDalian University of TechnologyDalian 116024LiaoningChina

A new crosslinked polymer,called P65,with appropriate photo-electrochemical,opto-electronic,and thermal properties,has been designed and synthesized as an efficient,dopant-free,hole-transport material(HTM)for n-i-p type planar perovskite solar cells(PSCs).P65 is obtained from a low-cost and easily synthesized spiro[fluorene-9,90-xanthene]-30,60-diol(SFX-OH)-based monomer X65 through a freeradical polymerization *** combination of a three-dimensional(3 D)SFX core unit,holetransport methoxydiphenylamine group,and crosslinked polyvinyl network provides P65 with good solubility and excellent film-forming *** employing P65 as a dopant-free hole-transport layer in conventional n-i-p type PSCs,a power conversion efficiency(PCE)of up to 17.7%is *** the best of our knowledge,this is the first time a 3 D,crosslinked,polymeric dopant-free HTM has been reported for use in conventional n-i-p type *** study provides a new strategy for the future development of a 3 D crosslinked polymeric dopant-free HTM with a simple synthetic route and low-cost for commercial,large-scale applications in future PSCs.

关键词： Perovskite solar cell Hole-transport material Dopant-free Crosslinked polymer Spiro[fluorene-9,9’-xanthene](SFX)

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Activating copper oxide for stable electrocatalytic ammonia oxidation reaction via in-situ introducing oxygen vacancies

引用

Nano Research 2022年第7期15卷 5987-5994页

作者： Jingjing Huang Zhe Chen Jinmeng Cai Yongzhen Jin Tao Wang Jianhui Wang department of chemistry Zhejiang UniversityHangzhou 310027China Key Laboratory of 3D Micro/Nano Fabrication and Characterization of Zhejiang Province School of EngineeringWestlake UniversityHangzhou 310024China Institute of Advanced Technology Westlake Institute for Advanced StudyHangzhou 310024China Center of artificial photosynthesis for solar fuels School of ScienceWestlake UniversityHangzhou 310024China Green Catalysis Center College of ChemistryZhengzhou UniversityZhengzhou 450001China School of Science Westlake Institute for Advanced StudyHangzhou 310024China

Electrocatalytic ammonia oxidation reaction(EAOR)provides an ideal solution for on-board hydrogen supply for fuel cells,while the lack of efficient and durable EAOR catalysts has been a long-standing obstacle for its practical ***,we reported that the defect engineering via in-situ electrochemically introducing oxygen vacancies(Vo)not only turns the inactive CuO into efficient EAOR catalyst but also achieves a high stability of over 400 h at a high current density of~200 mA·cm^(−2).Theoretical simulation reveals that the presence of Vo on the CuO surface induces a remarkable upshift of the d-band center of active Cu site closer to the Fermi level,which significantly stabilizes the reaction intermediates(*NHx)and efficiently oxidizes NH3 into *** Vo-modulated CuO shows a different catalytic mechanism from that on the conventional Pt-based catalysts,paving a new avenue to develop inexpensive,efficient,and robust catalysts,not limited to EAOR.

关键词： electrocatalysis ammonia oxidation reaction oxygen vacancy CuO stability

来源：

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

基于钌络合物催化水氧化反应中的质子传递调节:不止第二配位环境（英文）

引用

Science Bulletin 2023年第9期 854-856页

作者：刘天奇孙立成 department of chemistry School of Engineering Sciences in Chemistry Biotechnology and Health KTH Royal Institute of Technology centre of artificial photosynthesis for solar fuels and department of chemistry School of Science Westlake University

Proton transfer is a pivotal chemical process that occurs in a wide range of enzymatic reactions. One example is the identification of several water channels near the oxygen-evolving complex in photosystem II(OEC in P...

关键词：

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Simultaneously Effi cient solar Light Harvesting and Charge Transfer of Hollow Octahedral Cu_(2)S/CdS p-n Heterostructures for Remarkable Photocatalytic Hydrogen Generation

引用

Transactions of Tianjin University 2021年第4期27卷 348-357页

作者： Yanting Zhang Lei Ran Zhuwei Li Panlong Zhai Bo Zhang Zhaozhong Fan Chen Wang Xiaomeng Zhang Jungang Hou Licheng Sun State Key Laboratory of Fine Chemicals School of Chemical EngineeringDalian University of TechnologyDalian 116024China Center of Artifi cial photosynthesis for solar fuels School of ScienceWestlake UniversityHangzhou 310024China department of chemistry School of Engineering Sciences in ChemistryBiotechnology and HealthKTH Royal Institute of Technology10044 StockholmSweden

solar-driven water splitting is a promising alternative to industrial hydrogen *** study reports an elaborate design and synthesis of the integration of cadmium sulfi de(CdS)quantum dots and cuprous sulfi de(Cu_(2)S)nanosheets as three-dimensional(3D)hollow octahedral Cu_(2)S/CdS p-n heterostructured architectures by a versatile template and one-pot sulfi dation strategy.3D hierarchical hollow nanostructures can strengthen multiple refl ections of solar light and provide a large specifi c surface area and abundant reaction sites for photocatalytic water *** to the construction of the p-n heterostructure as an ideal catalytic model with highly matched band alignment at Cu_(2)S/CdS interfaces,the emerging internal electric fi eld can facilitate the space separation and transfer of photoexcited charges between CdS and Cu_(2)S and also enhance charge dynamics and prolong charge ***,the unique hollow Cu_(2)S/CdS architectures deliver a largely enhanced visible-light-driven hydrogen generation rate of 4.76 mmol/(g·h),which is nearly 8.5 and 476 times larger than that of pristine CdS and Cu_(2)S catalysts,*** work not only paves the way for the rational design and fabrication of hollow photocatalysts but also clarifi es the crucial role of unique heterostructure in photocatalysis for solar energy conversion.

关键词： Hollow octahedrons P-n heterostructure Charge separation Photocatalytic water splitting

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Electrocatalytic Hydrogenation and Oxidation in Aqueous Conditions

引用

Chinese Journal of chemistry 2020年第9期38卷 996-1004页

作者： Peili Zhang Licheng Sun State Key Laboratory of Fine Chemicals Institute of Artificial PhotosynthesisDUT-KTH Joint Education and Research Centre on Molecular DevicesDalian University of TechnologyDalianLiaoning 116024China department of chemistry School of Engineering Sciences in ChemistryBiotechnology and HealthKTH Royal Institute of Technology10044 StockholmSweden

Water molecule contains one oxygen and two hydrogen atoms,making it a potential oxygen and hydrogen *** organic reduction and oxidation using water as oxygen and/or hydrogen donors provide an environmentally friendly and sustainable strategy to replace traditional chemical-driven stoichiometric reactions that use sacrificial ***,the development of electrochemical synthesis provides a potential application for low tension photoelectricity,which is not cost-effective during boosted voltage and *** the last decade,electrocatalytic redox reactions of organic molecules in aqueous media had shown progress owing to the development of electrode materials and water-splitting *** paper highlights several electrocatalytic systems and corresponding mechanisms for both hydrogenation and oxidative transformation of representative *** activation process of protons and water on the working electrode surface has received special ***,paired electrolysis using water as the oxygen and hydrogen source has been *** paired system combines hydrogenation and oxidation half-reactions in one cell using water as the hydrogen and oxygen source,resulting in high atomic and electron utilization rates.

关键词： catalytic hydrogenation electrode

来源：

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

高效光催化二氧化碳还原钻单原子催化剂的多尺度结构工程

引用

Science China Materials 2024年第4期67卷 1292-1300页

作者：王榆惠郑天宇金昱丞孙婷婷丁旭王萧徐清梅李彤轩张少龙姜建壮 Beijing Advanced Innovation Center for Materials Genome Engineering Beijing Key Laboratory for Science and Application of Functional Molecular and Crystalline MaterialsDepartment of Chemistry and Chemical EngineeringSchool of Chemistry and Biological EngineeringUniversity of Science and Technology BeijingBeijing 100083China College of chemistry and Environmental Engineering Shenzhen UniversityShenzhen 518060China

人工光合作用将二氧化碳转化为增值化学品和燃料,在克服全球环境能源危机方面具有巨大潜力.然而,由于CO_(2)的热力学稳定性和动力学滞后性,开发高效的CO_(2)RR光催化剂是一个巨大的挑战.本文在微介孔氮掺杂碳(0.8-Co-ISAS/MMNC-900)上... 详细信息

人工光合作用将二氧化碳转化为增值化学品和燃料,在克服全球环境能源危机方面具有巨大潜力.然而,由于CO_(2)的热力学稳定性和动力学滞后性,开发高效的CO_(2)RR光催化剂是一个巨大的挑战.本文在微介孔氮掺杂碳(0.8-Co-ISAS/MMNC-900)上制备了一种具有高度分散Co单原子位的分级多孔钴单原子光催化剂,该催化剂显著促进了CO_(2)-to-CO的光还原.0.8-Co-ISAS/MMNC-900催化剂的CO生成速率高达7261μmol g^(-1)h^(-1),CO选择性高达90.1%,并且在四次循环测试中表现出良好的稳定性.实验数据和理论结果表明,分层多孔结构可以促进电荷分离引起的外部局部电场的形成,Co隔离的单原子位和微介孔构型协同作用,促进光激发电子积累、CO_(2)吸附活化和*COOH中间体的形成.本研究通过多尺度多孔结构工程,提出了一种合成CO_(2)还原光催化剂的新策略.

关键词：单原子热力学稳定性激发电子光还原多尺度结构人工光合作用多孔结构电荷分离

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

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

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

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

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

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：