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controllable synthesis of argentum decorated CuO_(x)@CeO_(2) catalyst and its highly efficient performance for soot oxidation

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Journal of Rare Earths 2022年第10期40卷 1546-1553页

作者： Jie Wan Yanjun Liu Yuanyuan Zhou Han Liu Gongde Wu Jianfei Kan Min Li Duan Weng Xiaodong Wu Energy Research Institute Nanjing Institute of TechnologyNanjing 211167China Key Laboratory of Advanced Materials of Ministry of Education School of Materials Science and EngineeringTsinghua UniversityBejing 100084China School of Civil Engineering Southeast UniversityNanjing 211189China State Key Laboratory of Digital Household Appliances Haier Group Technique R&D CenterQingdao 266100China

In this paper,CuO_(x)@Ag/CeO_(2) catalysts were synthesized by simple wet-chemical method and equal volume impregnation method.The obtained catalysts were subjected to soot temperature programmed oxidation(soot-TPO)activity tests and were further characterized by various techniques such as X-ray diffraction(XRD),transmission electron microscopy/high-resolution transmission electron microscopy(TEM/HR-TEM),N_(2) physisorption,X-ray photoelectron spectroscopy(XPS)and H_(2)-temperature programmed reduction(H_(2)-TPR).The results show that CuO_(x)@Ag/CeO_(2) synthesized presents well controlled core-shell structures,with nano-cube like Cu_(2)O as the core and Ag decorated polycrystalline CeO_(2) grafting layers as the shell.Such core-shell structured CuO_(x)@Ag/CeO_(2) can successfully construct a secondary oxygen delivery channel(CuO_(x)→CeO_(2)→Ag)to effectively transfer bulk oxygen of the catalyst to the soot,resulting in its excellent soot oxidation activity compared to CuO_(x)@CeO_(2).The potential benefiting effect by Ag introduction over Cu@Ag/Ce can be concluded as:(ⅰ)pumping lattice oxygen and accelerating gaseous O_(2) dissociation to generate significantly increased active surface oxygen content;(ⅱ)modulating a moderate surface oxygen vacancies concentration to maintain more highly active O_(2) species.

关键词： Soot oxidation CuO_(x) Ag/CeO_(2) controllable synthesis Active oxygen species Rare earths

Eu^(3+)/Tb^(3+)-doped whitlockite nanocrystals:controllable synthesis,cell imaging,and the degradation process in the bone reconstruction

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Nano Research 2022年第2期15卷 1303-1309页

作者： Zichen Yang Tianyu Yao Xiaoyan Zheng Junfeng Hui Daidi Fan Shaanxi Key Laboratory of Degradable Biomedical Materials and Shaanxi R&D Center of Biomaterials and Fermentation Engineering School of Chemical EngineeringNorthwest UniversityXian 710069China College of Life Sciences Northwest UniversityXian 710069China

Whitlockite(WH,Ca_(18)Mg_(2)(HPO_(4))_(2)(PO_(4))_(12))is an important inorganic phase in human bones and has positive significance for participating in the bone reconstruction process.In this paper,we report different doping strategies to prepare WH and WH-Ln(Eu/Tb)nanocrystals,and have successfully synthesized WH-Ln(Eu/Tb)nanoparticles(NPs)with bright red or green fluorescence based on ions exchange doping by two-step hydrothermal reaction.WH-5%Ln(Eu/Tb)NPs with the best fluorescence properties were successfully applied to live cell imaging,and WH-5%Eu NPs were implanted into the bone defect site in rabbit femoral condyles to visually observe its degradation process.The related results would help us understand WH nanocrystals and further expand their potential applications in tissue engineering and related fields.

关键词： whitlockite ions doping controllable synthesis cell imaging degradation process

controllable synthesis of Tb-based metal-organic frameworks as an efficient fluorescent sensor for Cu^(2+)detection

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Rare Metals 2021年第2期40卷 505-512页

作者： Cheng-Li Dong Ming-Feng Li Ting Yang Li Feng Ying-Wei Ai Zhang-Lei Ning Meng-Jiao Liu Xin Lai Dao-Jiang Gao College of Chemistry and Materials Science Sichuan Normal UniversityChengdu610068China China Key Laboratory of Bio-Resource and Eco-Environment of Ministry of Education College of Life SciencesSichuan UniversityChengdu610065China

A series of Tb-based metal-organic frameworks(Tb-MOFs)were successfully synthesized by a solvothermal method.The size and morphology of the as-obtained Tb-MOFs can be effectively controlled via regulating the experimental conditions such as the volume fraction of DMF and the molar ratio of Tb^(3+)to NaOH.It is found that all the samples exhibit strong green emissions under ultraviolet excitation,corresponding to^(5)D_(4)→^(7)F_(J)transitions of Tb^(3+).Interestingly,Tb-MOFs displayed an efficient and distinct luminescence quenching by Cu^(2+)in aqueous solutions.The competitive fluorescence detection experiments indicate that these Tb-MOFs sensors can be used as a high selective and sensitive sensor of Cu^(2+)detection with the detection limit of 10μmol·L^(-1),which can be used as a promising fluorescence sensor for Cu^(2+)detection in daily life.

关键词： Metal-organic frameworks controllable synthesis Luminescence Sensor Detection

controllable synthesis and surface modification of molybdenum oxide nanowires: a short review

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Tungsten 2019年第4期1卷 258-265页

作者： Dimberu G.Atinafu Wenjun Dong Minggang Du School of Materials Science and Engineering University of Science and Technology BeijingBeijing 100083China Science and Technology On Vehicle Transmission Laboratory China North Vehicle InstituteBeijing 100072China

Transition metal oxides are found to have overwhelming applications in energy,electronics,catalytic,and bio-and micromechanical systems.A recent report emphasized the current advancements in molybdenum oxide(MoO_(x))nanowire synthesis and the corresponding surface-functionalized nanostructured materials based on our previously reported investigations.The preparation of the nanowires and their applications were systematically summarized.MoO_(x) nanowires combined with substrates exhibited remarkable performances for high energy storage and power densities with high stability.In addition,the review concluded the future advancements of MoO_(x) nanowires.

关键词： Molybdenum oxide nanowire controllable synthesis Surface modification

synthesis and Modulation of Low-Dimensional Transition Metal Chalcogenide Materials via Atomic Substitution

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Nano-Micro Letters 2024年第9期16卷 49-94页

作者： Xuan Wang Akang Chen XinLei Wu Jiatao Zhang Jichen Dong Leining Zhang Key Laboratory of Cluster Science Ministry of Education of ChinaBeijing Key Laboratory of Photoelectronic and Electrophonic Conversion MaterialsSchool of Chemistry and Chemical EngineeringBeijing Institute of TechnologyBeijing 100081People’s Republic of China Beijing National Laboratory for Molecular Sciences Key Laboratory of Organic SolidsInstitute of Chemistry Chinese Academy of SciencesBeijing 100190People’s Republic of China

In recent years,low-dimensional transition metal chalcogenide(TMC)materials have garnered growing research attention due to their superior electronic,optical,and catalytic properties compared to their bulk counterparts.The controllable synthesis and manipulation of these materials are crucial for tailoring their properties and unlocking their full potential in various applications.In this context,the atomic substitution method has emerged as a favorable approach.It involves the replacement of specific atoms within TMC structures with other elements and possesses the capability to regulate the compositions finely,crystal structures,and inherent properties of the resulting materials.In this review,we present a comprehensive overview on various strategies of atomic substitution employed in the synthesis of zero-dimensional,one-dimensional and two-dimensional TMC materials.The effects of substituting elements,substitution ratios,and substitution positions on the structures and morphologies of resulting material are discussed.The enhanced electrocatalytic performance and photovoltaic properties of the obtained materials are also provided,emphasizing the role of atomic substitution in achieving these advancements.Finally,challenges and future prospects in the field of atomic substitution for fabricating low-dimensional TMC materials are summarized.

关键词： Transition metal chalcogenides Atomic substitution Ion exchange Low-dimensional materials controllable synthesis

controllable synthesis of Fe–N4 species for acidic oxygen reduction

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Carbon Energy 2020年第3期2卷 452-460页

作者： Xuecheng Yan Yi Jia Kang Wang Zhao Jin Chung-Li Dong Yu-Cheng Huang Jun Chen Xiangdong Yao Queensland Micro-and Nanotechnology Centre Griffith UniversityNathan CampusQueenslandAustralia Department of Chemistry University of Science and Technology BeijingBeijingChina Laboratory of Advanced Power Sources Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchunChina Department of Physics Tamkang UniversityNew Taipei CityTaiwan Intelligent Polymer Research Institute ARC Centre of Excellence for Electromaterials ScienceAIIM FacilityUniversity of WollongongInnovation CampusWollongongNew South WalesAustralia

controllable design and synthesis of catalysts with the target active sites are extremely important for their applications such as for the oxygen reduction reaction(ORR)in fuel cells.However,the controllably synthesizing electrocatalysts with a single type of active site still remains a grand challenge.In this study,we developed a facile and scalable method for fabricating highly efficient ORR electrocatalysts with sole atomic Fe-N4 species as the active site.Herein,the use of cost-effective highly porous carbon as the support not only could avoid the aggregation of the atomic Fe species but also a feasible approach to reduce the catalyst cost.The obtained atomic Fe-N4 in activated carbon(aFe@AC)shows excellent ORR activity.Its half-wave potential is 59 mV more negative but 47 mV more positive than that of the commercial Pt/C in acidic and alkaline electrolytes,respectively.The full cell performance test results show that the aFe@AC sample is a promising candidate for direct methanol fuel cells.This study provides a general method to prepare catalysts with a certain type of active site and definite numbers.

关键词： atomic Fe-N4 site controllable synthesis fuel cells oxygen reduction reaction

controllable synthesis of Externally Functional Dendronized Polymers

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CCS Chemistry 2020年第5期2卷 1040-1048页

作者： Run-Li Tang Sheng-Min Zhou Zi-Yao Cheng Hong Chen Li Deng Qian Peng Zhen Li Department of Chemistry Wuhan UniversityWuhan 430072 Institute of Molecular Aggregation Science Tianjin UniversityTianjin 300072 Institute of Chemistry The Chinese Academy of SciencesBeijing 100080

Through a controllable“reactivate””graft”synthetic route,two asymmetrical“Janus”dendronized polymers(DPs)were successfully synthesized.Dendrons were grafted to a linear polymer motherboard by a story-by-story constructionmethod.Due to the heterogenetic“Janus”structure,with orderly arranged chromophore moieties,the polymers demonstrated extremely large second-order nonlinear optical(NLO)coefficients and excellent NLO thermal stability.DP-4l and DP-6l had high d33 values of 232 and 227 pm/V,respectively,which reached the highest value reported so far for linear-based polymers containing simple azo-chromophore moieties.The controllable synthesis sheds light on the structure–property relationships of NLO polymers and other dendronized-structure functional polymers.

关键词： dendritic polymer controllable synthesis heterogenetic structure Janus polymer NLO

Scalable and controllable synthesis of 2D high-proportion 1T-phase MoS_(2)

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Nano Research 2020年第11期13卷 2933-2938页

作者： Xiang Gao Liukang Xiong Jiabin Wu Jun Wan Liang Huang Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan430074China State Key Laboratory of Materials Processing and Die&Mold Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan430074China

Two-dimensional molybdenum disulfide(2D MoS_(2))is considered as a promising candidate for many applications due to its unique structure and properties.However,the controllable synthesis of large-scale and high-quality 2D 1T-phase MoS_(2)is still a challenge.Herein,we present the scalable and controllable synthesis of 2D MoS2 from 2H to 1T@2H phase by using K_(2)SO_(4)salt as a simultaneous high-temperature sulfur source and template.The as-synthesized 1T@2H-2D MoS_(2)exhibits a high yield and can be easily assembled into freestanding electrode with high specific capacitance of 434 F/g at a scan rate of 1 mV/s in LiClO_(4)ethylene carbonate/dimethyl carbonate(EC/DMC).Moreover,various single-crystal 2D transition metal sulfides(WS_(2),PbS,MnS and Ni_(9)S_(8))and 2D S-doped carbon can be synthesized using this method.We believe that this study may provide a new sight for scalable and controllable synthesis of other 2D materials beyond 2D MoS_(2).

关键词： two-dimensional material MoS_(2) 1T phase scalable synthesis controllable synthesis

A Study on Constitutional Isomerism in Covalent Organic Frameworks:controllable synthesis,Transformation,and Distinct Difference in Properties

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CCS Chemistry 2020年第2期2卷 139-145页

作者： Rong-Ran Liang Fu-Zhi Cui Ru-Han A Qiao-Yan Qi Xin Zhao Key Laboratory of Synthetic and Self-Assembly Chemistry for Organic Functional Molecules Center for Excellence in Molecular SynthesisShanghai Institute of Organic ChemistryChinese Academy of SciencesShanghai 200032China

Isomerism is an essential and widespread phenomenon in organic chemistry but rarely observed in covalent organic frameworks(COFs),a novel class of crystalline porous organic polymers with versatile applications.Herein,we give an account of the first example of a controllable synthesis of constitutional isomers of a COF.The two isomers exhibited marked differences in their gas/vapor adsorption behaviors and chemical stability in various solvents.Furthermore,structure transformation from one isomer to the other was realized.This work not only paves the way for rational design and synthesis of COF isomers but also provides a vivid example of structure–property relationship in crystalline porous polymers.

关键词： covalent organic framework constitutional isomer controllable synthesis isomeric transformation adsorption behavior