检索结果-南通市图书馆

electronic coupling of Single Atom and FePS_3 Boosts Water Electrolysis

Energy & Environmental Materials 2022年第3期5卷 899-905页

作者： Chongyang Tang Dong He Nan Zhang Xianyin Song Shuangfeng Jia Zunjian Ke Jiangchao Liu Jianbo Wang Changzhong Jiang Ziyu Wang Xiaoqing Huang Xiangheng Xiao School of Physics and Technology Wuhan UniversityWuhan 430072China The Key Laboratory of Synthetic and Biological Colloids Ministry of EducationSchool of Chemical and Material EngineeringJiangnan UniversityWuxi 214122China Institute of Technological Sciences Wuhan UniversityWuhan 430072China State Key Laboratory of Physical Chemistry of Solid Surfaces College of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005China

Engineering the electronic structure of surface active sites at the atomic level can be an efficient way to modulate the reactivity of catalysts.Herein,we report the rational tuning of surface electronic structure of FePS_(3) nanosheets(NSs)by anchoring atomically dispersed metal atom.Theoretical calculations predict that the strong electronic coupling effect in single-atom Ni-FePS_(3) facilitates electron aggregation from Fe atom to the nearby Ni-S bond and enhances the electron-transfer of Ni and S sites,which balances the oxygen species adsorption capacity,reinforces water adsorption and dissociation process to accelerate corresponding oxygen evolution reaction(OER)and hydrogen evolution reaction(HER).The optimal Ni-FePS_(3)NSs/C exhibits outstanding electrochemical water-splitting activities,delivering an overpotential of 287 mV at the current density of 10 mA cm^(-2) and a Tafel slope of 41.1 mV dec^(-1) for OER;as well as an overpotential decrease of 219 mV for HER compared with pure FePS_(3)NSs/C.The concept of electronic coupling interaction between the substrate and implanted single active species offers an additional method for catalyst design and beyond.

关键词： electronic coupling iron thiophosphates nanosheet single atom water electrolysis

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

Binuclear Ruthenium Complexes with Benzo[1,2-b;4,5-b＇]- dithiophene Analogues as Bridge Ligands： Syntheses, Characterization and Notable Difference on electronic coupling

引用

Chinese Journal of Chemistry 2017年第7期35卷 1170-1178页

作者： Ya-Ping Ou Shunlin Tang Aihui Wang Junhua Li Fuxing Zhang Zhifeng Xu College of Chemistry and Material Science Hengyang Normal University Key Laboratory of Functional Organo-metallic Materials of Hengyang Normal University College of Hunan ProvinceHengyangHunan 421008China

Diruthenium ethynyl complexes 1--3 （1： 1,5-dithia-s-indacene-4,8-dione; 2： 4,8-diethoxybenzo[1,2-b：4,5- b＇]dithiophene; 3： 4,8-didodecyloxybenzo[1,2-b：4,5-b＇]dithiophene） have been synthesized by incorporating the re- spective conjugated heterocyclic spacer and characterized by NMR and elemental analysis. The effects of bridge ligands＇ properties on electronic coupling between redox-active ruthenium terminal groups were investigated by electrochemistry, UV/vis/near-IR and IR spectroelectrochemistry combined with density functional theory （DFT） and time-dependent DFT calculations. Electrochemistry results indicated that complexes 1--3 exhibit two fully re- versible oxidation waves, and complexes 2 and 3 with electron-rich and π-conjuagted bridge ligands are character- ized by excellent electrochemical properties. Furthermore, the larger v（C≡C） separation from the IR spectroelec- trochemical results of 2 and 3 and the intense NIR absorption features of singly oxidized species 2＋ and 3＋ re- vealed that their molecular skeletons have superior abilities to delocalize the positive charge. The spin density dis- tribution from DFT calculations proved the conclusions of this study.

关键词： bridge ligands ruthenium terminal groups spectroelectrochemistry electronic coupling

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

Intermolecular electronic coupling of 9-methyl-9H-dibenzo[a,c]carbazole for strong emission in aggregated state by substituent effect

引用

Science China Chemistry 2020年第10期63卷 1435-1442页

作者： Fan Liu Qiuyan Liao Jinfeng Wang Yanbing Gong Qianxi Dang Weidong Ling Mengmeng Han Qianqian Li Zhen Li Salvage Center for Molecular Sciences Department of ChemistryWuhan UniversityWuhan 430072China Institute of Molecular Aggregation Science Tianjin UniversityTianjin 300072China

Bright emission of organic luminogens at aggregated state has attracted increasing attention for their potential applications in opto-electronic devices and bio-/chemo-sensors.In this article,upon the introduction of different substituents(Br,Ph and TPh)to the large conjugated core of 9-methyl-9H-dibenzo[a,c]carbazole(DBC)moiety,the resultant luminogens demonstrated PL quantum yields in solid state ranging from 4.81%to 47.39%.Through the systematic investigation of molecular packing,together with theory calculation,the strong intermolecular electronic coupling in the dimers is proved as the main factor to the bright emission in the solid state.The results afforded a new avenue to investigate the intrinsic relationship among the molecular structures,packing modes and emission properties.

关键词： photoluminescence substituent effect molecular packing electronic coupling

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

配体密度控制促进CsPbBr_(3)量子点激子解离与能量转移实现高效CO_(2)光催化还原

引用

Science Bulletin 2024年第7期69卷 901-912页

作者：钟丰忆盛剑平杜晨宇何烨孙艳娟董帆 School of Resources and Environment University of Electronic Science and Technology of ChinaChengdu 611731China Research Center for Carbon-Neutral Environmental&Energy Technology Institute of Fundamental and Frontier SciencesUniversity of Electronic Science and Technology of ChinaChengdu 611731China

Perovskite quantum dots(PQDs) hold immense potential as photocatalysts for CO_(2) reduction due to their remarkable quantum properties,which facilitates the generation of multiple excitons,providing the necessary high-energy electrons for CO_(2) photoreduction.However,harnessing multi-excitons in PQDs for superior photocatalysis remains challenging,as achieving the concurrent dissociation of excitons and interparticle energy transfer proves elusive.This study introduces a ligand density-controlled strategy to enhance both exciton dissociation and interparticle energy transfer in CsPbBr_(3) PQDs.Optimized CsPbBr_(3) PQDs with the regulated ligand density exhibit efficient photocatalytic conversion of CO_(2) to CO,achieving a 2.26-fold improvement over unoptimized counterparts while maintaining chemical integrity.Multiple analytical techniques,including Kelvin probe force microscopy,temperaturedependent photoluminescence,femtosecond transient absorption spectroscopy,and density functional theory calculations,collectively affirm that the proper ligand termination promotes the charge separation and the interparticle transfer through ligand-mediated interfacial electron coupling and electronic interactions.This work reveals ligand density-dependent variations in the gas-solid photocatalytic CO_(2) reduction performance of CsPbBr_(3) PQDs,underscoring the importance of ligand engineering for enhancing quantum dot photocatalysis.

关键词： Perovskite quantum dots Ligands Photocatalytic CO_(2)reduction Exciton dissociation electronic coupling

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

Catalyzing Singlet Fission by Transition Metals:Second versus Third Row Effects

Precision Chemistry

引用

Precision Chemistry 2023年第9期1卷 555-564页

作者： Yuxuan Hou Ilias Papadopoulos Yifan Bo Anna-Sophie Wollny Michael J.Ferguson Lukas A.Mai Rik R.Tykwinski Dirk M.Guldi Department of Chemistry University of AlbertaEdmontonAlberta T6G 2G2Canada Department of Chemistry and Pharmacy&Interdisciplinary Center for Molecular Materials(ICMM) Friedrich-Alexander-University Erlangen-Nuremberg91058 ErlangenGermany Department of Applied Chemistry Graduate School of EngineeringCenter for Molecular Systems(CMS)Kyushu University744 Moto-okaNishi-kuFukuoka 819-0395Japan

The synthesis and characterization of platinum(II)and palladium(II)complexes bearing two(dimers Pt(L_(pc))_(2)Cl_(2)and Pd(L_(pc))_(2)Cl_(2)),one(monomers Pt(L_(pc))(L_(ref))Cl_(2)and Pd(L_(pc))(L_(ref))-Cl_(2)),or no(reference compounds Pt(L_(ref))_(2)Cl_(2)and Pd(L_(ref))_(2)Cl_(2))pentacene-based pyridyl ligands are presented.Photophysical properties of the dimers are probed by means of steady-state and time-resolved transient absorption measurements in compar-ison to the monomer and model compounds.Our results document that despite enhanced spin−orbit coupling from the presence of heavy atoms,intramolecular singlet fission(iSF)is not challenged by intersystem crossing.iSF thus yields correlated triplet pairs and even uncorrelated triplet excited states upon decoherence.Importantly,significant separation of the two pentacenyl groups facilitates decoupling of the two chromophores.Furthermore,the mechanism of iSF is altered depending on the respective metal center,that is,Pt(II)versus Pd(II).The dimer based on Pt(II),Pt(L_(pc))2Cl_(2),exhibits a direct pathway for the iSF and forms a correlated triplet pair with singlet−quintet spin-mixing within 10 ns in variable solvents.On the other hand,the dimer based on Pd(II),Pd(L_(pc))_(2)Cl_(2),leads to charge transfer mixing during the population of the correlated triplet pair that is dependent on solvent polarity.Moreover,Pd(L_(pc))_(2)Cl_(2)gives rise to a stable equilibrium between singlet and quintet correlated triplet pairs with lifetimes of up to 170 ns.Inherent differences in the size and polarizability,when contrasting platinum(II)with palladium(II),are the most likely rationale for the underlying trends.

关键词： metal complexes singlet fission pentacene dimers ultrafast spectroscopy electronic coupling

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

调控分子间的电子耦合效应实现多彩超长有机室温磷光

引用

Science China Materials 2023年第12期66卷 4749-4755页

作者：佘鹏飞段嘉宇李飞阳周宇翔秦妍妍魏娟刘淑娟马云赵强 State Key Laboratory of Organic electronics and Information Displays&Jiangsu Key Laboratory for Biosensors Institute of Advanced Materials(IAM)&Institute of Flexible Electronics(Future Technology)Nanjing University of Posts and Telecommunications(NUPT)Nanjing 210023China Department of Applied Biologyand Chemical Technology and Research Institute for Smart Energy The Hong Kong Polytechnic UniversityHung HomHong Kong(China)and the Hong Kong Polytechnic University Shenzhen Research InstituteShenzhen 518057China School of Environmental and Chemical Engineering Jiangsu University of Science and TechnologyZhenjiang 212100China College of electronic and Optical Engineering&College of Flexible electronics(Future Technology) Jiangsu Province Engineering Research Center for Fabrication and Application of Special Optical Fiber Materials and DevicesNanjing University of Posts and Telecommunications(NUPT)Nanjing 210023China

有机超长室温磷光聚合物因其优异的可加工性、灵活性和可重复性等特点,在各种光电应用中表现出巨大的应用潜力.然而,实现全彩的室温磷光仍然是一个挑战.在本文中,我们通过在聚乙烯醇中掺杂不同浓度的三苯基膦盐,成功制备了一系列余晖颜... 详细信息

有机超长室温磷光聚合物因其优异的可加工性、灵活性和可重复性等特点,在各种光电应用中表现出巨大的应用潜力.然而,实现全彩的室温磷光仍然是一个挑战.在本文中,我们通过在聚乙烯醇中掺杂不同浓度的三苯基膦盐,成功制备了一系列余晖颜色可调的有机室温磷光聚合物(从蓝色到红色).实验和理论计算证明:室温磷光聚合物颜色的宽范围调控归因于掺杂体膦盐分子间的电子耦合作用大小.此外,这些多彩的磷光聚合物可应用于柔性3D显示和防伪.

关键词： electronic coupling room-temperature phosphorescence polymer continuous RTP band tuning full-color RTP secure information printing

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

coupling metal oxide nanoparticle catalysts for water oxidation to molecular light absorbers

引用

Journal of Energy Chemistry 2017年第2期26卷 241-249页

作者： Heinz Frei Molecular Biophysics and Integrated Bioimaging Division Lawrence Berkeley National LaboratoryUniversity of CaliforniaBerkeleyCA 94720USA

Water oxidation, as a mandatory reaction of solar fuels conversion systems, requires the use of light absorbers with electronic properties that are well matched with those of the multi-electron catalyst in order to achieve high efficiency. Molecular light absorbers offer flexibility in fine tuning of orbital energetics,and metal oxide nanoparticles have emerged as robust oxygen evolving catalysts. Hence, these material choices offer a promising approach for the development of photocatalytic systems for water oxidation.However, efficient charge transfer coupling of molecular light absorbers and metal oxide nanoparticle catalysts has proven a challenge. Recent new approaches toward the efficient coupling of these components based on synthetic design improvements combined with direct spectroscopic observation and kinetic evaluation of charge transfer processes are discussed.

关键词： Water oxidation catalysts Metal oxides Molecular light absorbers Artificial photosynthesis Charge transfer electronic coupling

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

Heterogeneous nanocomposites consisting of Pt_(3)Co alloy particles and CoP_(2) nanorods towards high-efficiency methanol electro-oxidation

引用

SmartMat 2021年第2期2卷 234-245页

作者： Niuwa Yang Dong Chen Penglei Cui Tingyu Lu Hui Liu Chaoquan Hu Lin Xu Jun Yang State Key Laboratory of Multiphase Complex Systems Chinese Academy of SciencesBeijingChina Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijingChina Nanjing IPE Institute of Green Manufacturing Industry NanjingJiangsuChina Jiangsu Key Laboratory of New Power Batteries School of Chemistry and Materials ScienceNanjing Normal UniversityNanjingJiangsuChina

Heterogeneous nanocomposites comprising chemically distinct constituents are particularly promising in electrocatalysis.We herein report a synthetic strategy that combines the reduction of Pt and Co ionic precursors at an appropriate ratio with the subsequent phosphating at an elevated temperature for forming heterogeneous nanocomposites consisting of quasi-spherical Pt_(3)Co alloy domains and rod-like CoP_(2) domains for high-efficiency methanol electrooxidation.The strong electronic coupling between Pt_(3)Co and CoP_(2) domains in the nanocomposites render the electron density around Pt atoms to decrease,which is favorable for reducing the adsorption of poisoning CO-like intermediates on the catalyst surfaces.Accordingly,the as-prepared heterogeneous Pt_(3)Co–CoP_(2) nanocomposites show good performance for methanol electrooxidation both in acidic and alkaline media.In specific,at a Pt loading of only 6.4%on a common carbon substrate,the mass-based activity of Pt_(3)Co–CoP_(2) nanocomposites in an acidic medium is about 2 and 1.5 times as high as that of commercial Pt/C catalyst(20%mass loading)and home-made Pt_(3)Co alloy nanoparticles(8.0%mass loading),while in the alkaline medium,these values are 3 and 2,respectively.

关键词： electrocatalysis electronic coupling methanol electro-oxidation nanocomposite Pt_(3)Co-CoP_(2)

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

单原子Ru修饰的三维多级Co(OH)F纳米片阵列高效催化析氧反应

引用

Science China Materials 2021年第6期64卷 1408-1417页

作者：周士正 Haeseong Jang 秦清李子健 Min Gyu Kim 李创刘希恩 Jaephil Cho State Key Laboratory Base of Eco-Chemical Engineering College of Chemical EngineeringQingdao University of Science and TechnologyQingdao 266042China Department of Energy Engineering Department of Energy and Chemical EngineeringUlsan National Institute of Science and Technology(UNIST)Ulsan 44919South Korea Department of Chemistry City University of Hong KongHong KongChina Beamline Research Division Pohang Accelerator Laboratory(PAL)Pohang 37673South Korea

单原子与基底之间的电子耦合在提升单原子催化剂的本征催化活性方面起到至关重要的作用.本文通过一步水热法在温和条件下制备了单原子Ru修饰的三维多级Co(OH)F纳米片阵列催化剂.该催化剂在1 mol L^(−1)KOH电解液中展现出高的电催化析氧... 详细信息

单原子与基底之间的电子耦合在提升单原子催化剂的本征催化活性方面起到至关重要的作用.本文通过一步水热法在温和条件下制备了单原子Ru修饰的三维多级Co(OH)F纳米片阵列催化剂.该催化剂在1 mol L^(−1)KOH电解液中展现出高的电催化析氧反应活性和稳定性,在10和500 mA cm^(−2)的电流密度下分别表现出200和326 mV的过电位.通过对催化剂析氧反应前后的电子结构和表面化学态的研究发现,单原子Ru和Co(OH)F之间强烈的电子耦合诱导体系电荷重新分布,并抑制了Ru在高的OER电势下被过度氧化为过高的价态(大于+4价).本工作提供了一个通过羟基氟化钴稳定单原子Ru,以提高大电流下析氧反应的活性和稳定性的策略.

关键词： electrocatalyst oxygen evolution reaction single atom ruthenium electronic coupling

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

Mixed-valency of covalently bonded Mo2 dimers and the mechanisms for charge transport in Redox active Rh2 molecular wires

Mixed-valency of covalently bonded Mo2 dimers and the mechan...

引用

2018年中西部地区无机化学化工学术研讨会

作者： Chun Yuan Liu Tao Cheng Ying Ning Tan Donglei Bu Miao Meng Department of Chemistry Jinan University

Bridged Mo2 dimers, denoted as [Mo2]-bridge-[Mo2], are favourable model compounds for study of electronic coupling and intramolecular electron transfer because of the unique electronic structure of the [Mo2] unit. The formation of the Mo-Mo quadruple bond removes the d orbtal degeneracy, giving the Mo2 unit a σπδ electronic configuration. Therefore, as an electronic donor(D)-bridge(B)-acceptor(A) system, the transferring electron is specified to be the δ electrons and D-A electron transfer can be probed by the metal(δ) to bridging ligand(π*)(ML) and bridging ligand(π) to metal(δ)(LM) and vibronic(δ) metal to metal(δ) absorptions, in accordance with superexchange theory. By varying the ancillary ligands and the bridging ligands, a diverse of complexes of this type, have been synthesized and studied.[1-7] The electronic coupling matrix elements(HAB) are evaluated according to the Mulliken-Hush and CNS theories, which give consistent results. The mixed-valence properties are discussed in terms of Robin-Day’s scheme. System transition from Class Ⅰ to Class Ⅱ to Class Ⅲ via the Class Ⅱ-Ⅲ borderline is examined in a series of four species with subtle differences(Fig.1 A).[8-9] We found that for a very strong coupling system, the underlying ground state is better described in terms of simple delocalized electronic states rather evolving from strongly coupled diabatic states which define Class Ⅲ;therefore, the extreme of mixed valency may be termed as Class Ⅳ(Fig. 1 B).[10-11]In recent study,[12] self-assembly of Rh(O CCH) with linear N,N-bidentate ligands on gold substrate has developed two series of redox active molecular wires differing in the strength of electronic coupling. A mechanistic transition from charge tunnelling to hopping occurs on the wires with four Rh2 units, irrespective of the nature and length of the wires. Surprisingly, while generally weak length-dependence of electric resistance is observed for both series, the relatively weakly coupled wires with longer bridging ligand exhibits even higher conduc

关键词： metal-metal bond mixed-valence compounds electronic coupling electron transfer and molecular wires

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

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：