检索结果-南通市图书馆

Solar-assisted photocatalytic water splitting using defective UiO-66 solids from modulated synthesis

Nano Research 2024年第5期17卷 4134-4150页

作者： Celia M.Rueda-Navarro María Cabrero-Antonino Paula Escamilla Valentín Díez-Cabanes Dong Fan Pedro Atienzar Belén Ferrer Ignacio Vayá Guillaume Maurin Herme G.Baldoví Sergio Navalón Departamento de Química Universitat Politècnica de ValènciaCamino de Vera s/nValencia 46022Spain Instituto de Ciencia Molecular(ICMOL) Universitat de ValènciaPaterna 46980Spain icgm Univ.MontpellierCNRSENSCMMontpellier34095France Instituto de Tecnología Química(UPV-CSIC) Universitat Politècnica de ValènciaAvenida de los Naranjos s/nValencia 46022Spain

Metal-organic frameworks(MOFs)are attracting increasing interests as photocatalysts for solar-driven hydrogen production from water.This paper reports on a comparative study of using either acetic acid(AA)or trifluoroacetic acid(TFA)as the representative UiO-66 organic modulators for synthesizing visible light responsive UiO-66(Zr)-X(X:NH_(2) or NO_(2))photocatalysts for water splitting.The results show that photocatalytic hydrogen generation from a water/methanol mixture can be improved by varying the nature and amount of the modulator employed to prepare the different UiO-66(Zr)-X(X:NH_(2) or NO_(2))solid derivatives.UiO-66(Zr)-NH_(2) was the most active photocatalyst,followed by UiO-66(Zr)-NO_(2),both prepared with 12 equivalents of AA with respect to the organic ligand.This UiO-66(Zr)-NH_(2) solid was more active than the parent MOF in photocatalytic overall water splitting(OWS)(H_(2) and O_(2) production of 450 and 160μmol·g^(-1),respectively,in 5 h;apparent quantum yield(AQY)at 400 nm of 0.06%)in the absence of methanol and compares favourably with analogous reports.Information on the photocatalytic activity of the most active solids of both series was obtained by means of a series of techniques,including ultraviolet-visible(UV-vis)diffuse reflectance,X-ray photoelectron spectroscopy(XPS),laser flash photolysis(LFP),electron spin resonance(ESR),photoluminescence and photoelectrochemical measurements together with density functional theory(DFT)calculations.The results showed that organic acid modulators can be used to enhance the photocatalytic activity of missing linker UiO-66 defective materials in solar-powered water splitting.

关键词： heterogeneous photocatalysis metal-organic frameworks(MOFs) UiO-66 materials carboxylic acid modulators water splitting solar light

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

Mechanisms of electrochemical magnesium(de)alloying of Mg-Sn and Mg-Pb polymorphs

引用

Journal of Magnesium and Alloys 2022年第6期10卷 1609-1616页

作者： Clément Pechberty Antoine Klein Bernard Fraisse Lorenzo Stievano Romain Berthelot icgm CNRSUniv.MontpellierENSCMMontpellierFrance RS2E CNRSHub de l’EnergieAmiensFrance

Different polymorphs of Mg-Sn and Mg-Pb intermetallic compounds were prepared by high-energy mechanical alloying and then investigated as active material in magnesium batteries. Beside thermodynamically stable Mg_(2)Sn and Mg_(2)Pb crystallizing in the anti-fluorite structure, other polymorphs Mg_(~2)Sn and Mg_(~2)Pb were prepared by increasing the ball-milling time. The first dealloying process is almost complete only for the cubic polymorphs, then similar capacities are observed during the subsequent alloying and dealloying sequences.Thanks to operando X-ray diffraction, the electrochemical mechanism is revealed and shows that the cubic polymorphs Mg_(2)Sn and Mg_(2)Pb tend to preferentially form during the alloying whatever the pristine intermetallic. Weak traces of Mg_(~2)Sn and Mg_(~2)Pb are observed during the alloying, suggesting that these polymorphs act as a by-product and/or an intermediate phases of the electrochemical process. Finally, the compatibility of cubic Mg_(2)Sn and Mg_(2)Pb with Mg(TFSI)_(2)-based electrolyte is confirmed in full cell vs. a positive electrode based on the Chevrel phase Mo6S8, although limited performance is achieved. This fundamental work provides new insights in the behavior of alloy-type negative electrodes for magnesium-ion batteries.

关键词： Magnesium batteries Alloy electrode Mechanochemistry Operando X-ray diffraction

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

Reduced formation of peroxide and radical species stabilises iron-based hybrid catalysts in polymer electrolyte membrane fuel cells

引用

Journal of Energy Chemistry 2022年第2期31卷 433-438页

作者： Dongyoon Shin Sabita Bhandari Marc FTesch Shannon ABonke Frédéric Jaouen Sonia Chabbra Christoph Pratsch Alexander Schnegg Anna K.Mechler Max Planck Institute for Chemical Energy Conversion Stiftstr.34–3645470 Mülheim an der RuhrGermany icgm Univ.MontpellierCNRSENSCMMontpellierFrance Fritz Haber Institute of the Max Planck Society Department of Inorganic ChemistryFaradayweg 4-614195 BerlinGermany

The incorporation of Pt into an iron-nitrogen-carbon(Fe NC)catalyst for the oxygen reduction reaction(ORR)was recently shown to enhance catalyst stability without Pt directly contributing to the ORR activity.However,the mechanistic origin of this stabilisation remained obscure.It is established herein with rotating ring disc experiments that the side product,H_(2)O_(2),which is known to damage FeNC catalysts,is suppressed by the presence of Pt.The formation of reactive oxygen species is additionally inhibited,independent of intrinsic H_(2)O_(2) formation,as determined by electron paramagnetic resonance.Transmission electron microscopy identifies an oxidised Fe-rich layer covering the Pt particles,thus explaining the inactivity of the latter towards the ORR.These insights develop understanding of Fe NC degradation mechanisms during ORR catalysis,and crucially establish the required properties of a precious metal free protective catalyst to improve Fe NC stability in acidic media.

关键词： Electrochemistry Fuel cells Oxygen reduction reaction Non-precious metal catalyst Hybrid catalyst Stability

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

Well-Defined Fluorinated Copolymers:Current Status and Future Perspectives

引用

Accounts of Materials Research 2021年第4期2卷 242-251页

作者： Subrata Dolui Devendra Kumar Sanjib Banerjee Bruno Ameduri Department of Chemistry Indian Institute of Technology BhilaiRaipur 492015ChhattisgarhIndia icgm Universitéde MontpellierCNRSENSCMMontpellierFrance

Well-defined fluoropolymers exhibit unique properties such as excellent oil and water repellency,satisfactory thermal stability,a low refractive index,and low surface energy.The origin of these properties is attributed to the presence of a strong electronegative and low polarizable fluorine atom in the backbone of such polymers,which leads to a strong C−F bond(with a high bond dissociation energy of 485 kJ mol−1).Because of these features,these polymers have found applications as functional coatings,thermoplastics,biomedical items,separators,and binders for Li ion batteries,fuel cell membranes,piezoelectric devices,high-quality wires and cables,and so forth.Usually,fluoropolymers are synthesized by the conventional radical(co)polymerization of fluoroalkenes,which leads to the production of(co)polymers with an ill-defined end group,uncontrolled molar mass,and high dispersity values.In the last two decades,significant developments of various reversible deactivation radical polymerization(RDRP)techniques have helped the design of macromolecular architectures(including block,graft,star,and dendrimers)on demand.However,for relevant new applications,well-defined fluoropolymers with controlled macromolecular architectures(e.g.,block copolymers as thermoplastic elastomers and electroactive polymers or graft copolymers for fuel cell membranes)are required.Several RDRP methods,developed in the last two decades,have paved the way for the synthesis of(co)polymers with well-defined molar mass,dispersity,chain end-functionality,and macromolecular architectures.Some of these RDRP techniques have been successfully employed for the synthesis of well-defined fluorinated copolymers.These techniques include iodine-transfer polymerization(ITP),reversible addition−fragmentation chain-transfer(RAFT)polymerization,organometallic-mediated radical polymerization(OMRP),and,to a lesser extent,nitroxide-mediated polymerization(NMP).Impressive control of the molar mass parameters of the fluoropolymers synthesized via these techniques also enc

关键词： polymerization molar reversible

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

Correlation between the surface characteristics of carbon supports and their electrochemical stability and performance in fuel cell cathodes

引用

Carbon Energy 2021年第4期3卷 654-665页

作者： Ignacio Jiménez-Morales Alvaro Reyes-Carmona Marc Dupont Sara Cavaliere Marlene Rodlert Flavio Mornaghini Mikkel J.Larsen Madeleine Odgaard Jerzy Zajac Deborah J.Jones Jacques Rozière icgm Universitéde Montpellier CNRSENSCMMontpellierFrance Institut Universitaire de France(IUF) ParisFrance Imerys Graphite and Carbon BodioSwitzerland IRD Fuel Cells A/S Odense SØDenmark

In this paper,an extensive characterisation of a range of carbon blacks(CB)with similar surface area but different surface chemistry is carried out by flow calorimetry,Raman spectroscopy,dynamic water vapour sorption,instrumental gas analysis,nitrogen adsorption/desorption and high potential chronoamperometry.Using these carbon materials as supports,Pt/CB electrocatalysts are prepared by microwave-assisted polyol-mediated synthesis in gram scale.Structural,morphological and electrochemical properties of the prepared electrocatalysts are evaluated by X-ray diffraction,transmission electron microscopy,rotating disc electrode and in situ fuel cell characterisation of the corresponding membrane-electrode assemblies.The obtained results allow to establish a relationship between surface chemistry and electrochemical properties useful for the design of Pt/C catalyst layers with high performance and stability.

关键词： carbon black electrocatalyst support fuel cell cathodes surface properties

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

Regulating electronic structure of porous nickel nitride nanosheet arrays by cerium doping for energy-saving hydrogen production

引用

Nano Research 2023年第2期16卷 2543-2550页

作者： Rui-Qing Li Suyuan Zeng Bin Sang Chaozhuang Xue Konggang Qu Yu Zhang Wei Zhang Guangyu Zhang Xinghui Liu Jie Deng Olivier Fontaine Yachao Zhu School of Textile and Clothing Nantong UniversityNantong 226019China School of Chemistry and Chemical Engineering Shandong Provincial Key Laboratory/Collaborative Innovation Center of Chemical Energy Storage and Novel Cell TechnologyLiaocheng UniversityLiaocheng 252059China Department of Chemistry Sungkyunkwan UniversityJangan-GuSuwon 16419Republic of Korea Institute for Advanced Study&College of Food and Biological Engineering Chengdu UniversityChengdu 610106China Molecular Electrochemistry for Energy laboratory VISTECRayong 21210Thailand Institut Universitaire de France 75005 ParisFrance icgm Universitéde MontpellierCNRS34293 MontpellierFrance

Water electrolysis for energy-efficient H_(2)production coupled with hydrazine oxidation reaction(HzOR)is prevailing,while the sluggish electrocatalysts are strongly hindering its scalable application.Herein,we schemed a novel porous Ce-doped Ni3N nanosheet arrays grown on nickel foam(Ce-Ni3N/NF)as a remarkable bifunctional catalyst for both hydrogen evolution reaction and HzOR.Significantly,the overall hydrazine splitting system can achieve low cell voltages of 0.156 and 0.671 V at 10 and 400 mA·cm^(−2),and the system is remarkably stable to operate over 100 h continuous test at the high-current-density of 400 mA·cm^(−2).Various characterizations prove that the porous nanosheet arrays expose more active sites,and more excellent diffusion kinetics and lower charge-transfer resistance,therefore boosting catalytic performance.Furthermore,density functional theory calculation reveals that the incorporation of Ce can effectively optimize the free energy of hydrogen adsorption and promote intrinsic catalytic activity of Ni_(3)N.

关键词： electrocatalysis cerium doping hydrogen evolution reaction hydrazine oxidation reaction adsorption free energy

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

Elaboration of Materials with Functionality Gradients by Assembly of Chitosan-Collagen Microspheres Produced by Microfluidics

引用

Journal of Renewable Materials 2018年第3期6卷 314-324页

作者： David Azria Raluca Guermache Sophie Raisin Sébastien Blanquer Frédéric Gobeaux Marie Morille Emmanuel Belamie icgm-MACS UMR 5253 CNRS-ENSCM-UMCharles Gerhardt Institute Montpellier8 rue de l’Ecole normale34296 Montpellier cedex 5France Ecole Pratique des Hautes Etudes PSL Research University75014 ParisFrance LIONS-NIMBE CEA CNRSUniversity of Paris-SaclayCEA Saclay91191 Gif-sur-YvetteFrance

Biopolymers extracted from renewable resources like chitosan and collagen exhibit interesting properties for the elaboration of materials designed for tissue engineering applications,among which are their hydrophilicity,biocompatibility and biodegradability.In many cases,functional recovery of an injured tissue or organ requires oriented cell outgrowth,which is particularly critical for nerve regeneration.Therefore,there is a growing interest for the elaboration of materials exhibiting functionalization gradients able to guide cells.Here,we explore an original way of elaborating such gradients by assembling particles from a library of functionalized microspheres.We propose a simple process to prepare chitosan-collagen hybrid microspheres by micro-and milli-fluidics,with adaptable dimensions and narrow size distributions.The adhesion and survival rate of PC12 cells on hybrid microspheres were compared to those on pure chitosan ones.Finally,functionalized microspheres were assembled into membranes exhibiting a functionalization gradient.

关键词： Hybrid microspheres biomaterials chitosan collagen functionality gradient nerve regeneration microfluidics

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

Fatigue phenomena in thin ferroelectric films stimulated by repeated switching of the polarization

引用

Journal of Advanced Dielectrics 2013年第1期3卷 23-31页

作者： A.S.Sidorkin P.Saint-Gregoire L.P.Nesterenko Experimental Physics Department Voronezh State University University Sq.1Voronezh394006Russia MIPA Laboratory University of Nimes Department of Sciences and ArtsPl Gabriel Peri 30021 Nimes Cedex 01France and ICGM(UMR CNRS Nr 5253)C2MUM234095 Montpellier cedexFrance

With the use of techniques of SawyerTower and Mertz method regularities of the origin of "fatigue"in thin ferroelectric films of lead titanate and lead zirconate titanate have been investigated in the fields above coercive.We propose a model to explain the experimentally observed switching-dependent fatigue processes by the motion of charged dislocations in an applied external alternating electric field.

关键词： Ferroelectric switching domain boundary fatigue hysteresis coercive field

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

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

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

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：