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Construction of 3d interconnected boron nitride/carbon nanofiber hybrid network within polymer composite for thermal conductivity improvement

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Journal of Materials Science & Technology 2023年第16期147卷 165-175页

作者： Yexiang Cui Fei Xu di Bao Yueyang Gao Jianwen Peng dan Lin Haolei Geng Xiaosong Shen Yanji Zhu Huaiyuan Wang School of Chemical Engineering and Technology and State Key Laboratory for Chemical Engineering Tianjin UniversityTianjin 300350China Collaborative Innovation Center of Chemical Science and Engineering(Tianjin) Tianjin Key Laboratory of Chemical Process Safety and Equipment TechnologyTianjin UniversityTianjin 300350China College of Chemistry and Chemical Engineering Northeast Petroleum UniversityDaqing 163318China School of Materials Science and Engineering Tianjin UniversityTianjin 300350China

With the increasing power density and integration of electronic devices,polymeric composites with high thermal conductivity(TC)are in urgent demand for solving heat accumulation issues.However,the direct introduction of inorganic fillers into a polymer matrix at low filler content usually leads to low TC enhancement.In this work,an interconnected three-dimensional(3d)polysulfone/hexagonal boron nitride-carbon nanofiber(PSF/BN-CNF)skeleton was prepared via the salt templated method to address this issue.After embedding into the epoxy(EP),the EP/PSF/BN-CNF composite presents a high TC of 2.18 W m^(−1) K^(−1) at a low filler loading of 28.61 wt%,corresponding to a TC enhancement of 990%compared to the neat epoxy.The enhanced TC is mainly attributed to the fabricated 3d interconnected structure and the efficient synergistic effect of BN and CNF.In addition,the TC of the epoxy composites can be further increased to 2.85 W m^(−1) K^(−1) at the same filler loading through a post-heat treatment of the PSF/BN-CNF skeletons.After carbonization at 1500°C,the adhesive PSF was converted into carbonaceous layers,which could serve as a thermally conductive glue to connect the filler network,further decreasing the interfacial thermal resistance and promoting phonon transport.Besides,the good heat dissipation performance of the EP/C/BN-CNF composites was directly confirmed by thermal infrared imaging,indicating a bright and broad application in the thermal management of modern electronics and energy fields.

关键词： Thermal conductivity Boron nitride Carbon nanofiber 3d network Epoxy composites

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Material and device design for organic solar cells: towards efficiency and stability

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Science China Chemistry 2023年第12期66卷 3484-3494页

作者： Mingrui Pu Feng He Shenzhen Grubbs Institute and department of Chemistry Southern University of Science and TechnologyShenzhen 518055China Guangdong Provincial Key Laboratory of Catalysis Southern University of Science and TechnologyShenzhen 518055China

Organic solar cells(OSCs) have garnered significant attention as a novel photovoltaic technology and have been extensively investigated. In recent years, OSCs have made rapid strides in power conversion efficiency(PCE), demonstrating their significant potential in practical applications. In addition to high PCE, the practical application of OSCs demands a prolonged operating lifespan. The rational design of materials and devices to achieve efficient and stable OSCs is pivotal. This feature article presents a thorough analysis of our group's studies on enhancing efficiency and stability through material and device design. We introduce a range of exceptional chlorine-mediated organic photovoltaic materials and systematically summarize chlorine atom(Cl) induced effects on energy levels, molecular stacking, active layer film morphology and photovoltaic performance. Furthermore, the use of single-crystal diffraction technology allows for a comprehensive understanding of intermolecular packing and interaction at the molecular level. A series of highly efficient non-fullerene acceptors(NFAs) with threedimensional(3d) network packing structures are developed and discussed. Subsequently, based on efficient 3d network brominated NFAs, the studies on polymer and oligomer acceptor materials are carried out and achieve efficient and stable OSCs.In addition to materials design, the development of the “quasiplanar heterojunction”(Q-PHJ) based OSC device also plays an important role in achieving superior efficiency and stability. These design experiences of materials and devices hope to provide valuable guidance for the development of efficient and stable OSCs.

关键词： chlorine-mediated photovoltaic materials single-crystal 3d network efficiency stability

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A Novel Hierarchical Porous 3d Structured Vanadium Nitride/Carbon Membranes for High-performance Supercapacitor Negative Electrodes

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纳微快报：英文版 2018年第4期10卷 81-91页

作者： Yage Wu Yunlong Yang Xiaoning Zhao Yongtao Tan Ying Liu Zhen Wang Fen Ran State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals Lanzhou University of Technology School of Material Science and Engineering Lanzhou University of Technology

Transition-metal nitrides exhibit wide potential windows and good electrochemical performance, but usually experience imbalanced practical applications in the energy storage field due to aggregation, poor circulation stability, and complicated syntheses. In this study, a novel and simple multiphase polymeric strategy was developed to fabricate hybrid vanadium nitride/carbon(VN/C) membranes for supercapacitor negative electrodes, in which VN nanoparticles were uniformly distributed in the hierarchical porous carbon 3d networks. The supercapacitor negative electrode based on VN/C membranes exhibited a high specific capacitance of 392.0 F g^(-1) at 0.5 A g^(-1) and an excellent rate capability with capacitance retention of 50.5% at 30 A g^(-1). For the asymmetric device fabricated using Ni(OH)_2//VN/C membranes, a high energy density of 43.0 Wh kg^(-1) at a power density of800 W kg^(-1) was observed. Moreover, the device also showed good cycling stability of 82.9% at a current density of 1.0 A g^(-1) after 8000 cycles. This work may throw a light on simply the fabrication of other high-performance transition-metal nitridebased supercapacitor or other energy storage devices.

关键词： Supercapacitors Vanadium nitride/carbon 3d network Hierarchical porous structure

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Novel Poly m eric Transition Metal Co m plexes Having1d Chain and 3d networks Structures

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Chinese Journal of Structural Chemistry 1999年第5期18卷 384-392页

作者：洪茂椿曹荣等 StateKeyLaboratoryofStructuralChemistry FujianInst StateKeyLaboratoryofStructura

The syntheses and structures of eleven novel polymeric transition metal complexes having one dimensional chain structures or three dimensional networks are summarized. They are prepared from the controlled assembling reactions in organic solvents and characterized by X ray diffraction analyses. The spectroscopic or magnetic properties of some complexes are studied.

关键词： polymeric metal complex linear chain structure 3d network

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Synthesis and Structure of Bis[2,6-bis(2-pyridylamino)pyridinium] Tetrachlorocadmiumate(II)

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Chinese Journal of Structural Chemistry 2006年第6期25卷 714-718页

作者： ZHANG Min XIE Yong-Shu WEI Kai-Ju LIU Qing-Liang PENG Shie-Ming department of Chemistry University of Scienceand Technology of China i-lefei 230026 China department of Chemistry National Taiwan University Taipei Taiwan

The title compound （H3tpda）2[CdCl4] （H2tpda = 2,6-bis（2-pyridylamino）pyridi-ne） was synthesized by the reaction of CdCl2 with H2tpda in methanol under acidic condition. Singlecrystal X-ray analysis reveals that the compound crystallizes in monoclinic, space group P21/n with a = 13.377（3）, b = 16.978（3）, c = 14.328（3） A, β = 94.75（3）°, V = 3243.1（11） A^3, Z = 4, de = 1.603 g/cm^3,μ = 1.042 mm^-1, F（000） = 1576, C30H28CdCl4N10, Mr = 782.82, T = 291（2） K, R = 0.0433 and wR = 0.0848 for observed 4554 reflections with I 〉 2σ（I）. The cadmium（Ⅱ） atom in the complex anion is tetrahedrally coordinated by four chlorine atoms, whereas, in each [H3tpda]＋ cation, one pyridyl nitrogen is protonated. A 3d network is formed by multiple intermolecular hydrogen bonds between the cations and anions as well as π-π interactions among the pyridyl rings.

关键词： crystal structure cadmium complex 3d network tripyridyldiamine

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Hydrothermal Synthesis, Crystal Structure and Property of a Novel Inorganic-organic Hybrid Compound Based on Phosphomolybdate Anion [H-IdP]_4[PMo_(12)O_(40)]·8H_2O (IdP = 4-(Imidazole-1-yl)phenol)

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Chinese Journal of Structural Chemistry 2009年第1期28卷 72-76页

作者：周艳红张宏关丽崔术新逄媛媛 Institute of Polyoxometalate Chemistry Department of Chemistry Northeast University

A novel compound [H-IdP]4[PMo12O40]·8H2O 1 based on Keggin-type phosphor- molybdate has been synthesized by hydrothermal method and characterized by IR spectroscopy, elemental analyses and single-crystal X-ray diffraction. The composite crystallizes in the mono- clinic system, space group C2/m with a = 13.937（5）, b = 27.033（5）, c = 10.857（5） A, β = 122.489（5）°, V = 3450（2）A^3, Mr = 2611.11, Z = 2, dc = 2.498 g/cm^3, F（000） = 2486,μ = 2.243 mm^-1, the final R = 0.0568 and wR = 0.1216 for 2707 observed reflections with I 〉 2σ（I）. X-ray structural study shows that 1 consists of a [PMo12O40]^4- polyanion, four protonated IdP cations and eight H2O molecules. In the structure of 1, a 3d network forms by hydrogen bond of [PMo12O40]^4- polyanion, HIdP^＋ cation and H2O molecules. Upon excitation wavelength of 280 nrn in hydroxylic solvents at room temperature, 1 shows fluorescence property.

关键词： hydrothermal synthesis phosphomolybdate 3d network

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Syntheses, Structures and Photocatalytic degradation Properties of Two Copper(Ⅱ) Coordination Polymers with Flexible Bis(imidazole) Ligand

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Chinese Journal of Structural Chemistry 2021年第5期40卷 595-602,528页

作者：张勇覃鸿妮李宝龙吴冰 China Suzhou Industrial Park Institute of Services Outsourcing Suzhou 215123China State and Local Joint Engineering Laboratory for Functional Polymeric Materials College of ChemistryChemical Engineering and Materials ScienceSoochow UniversitySuzhou 215123China

Two copper(Ⅱ) coordination polymers {[Cu(bib)(nip)]·1.5 H_(2)O}_(n)(1) and [Cu_(2)(bib)(glu)_(2)]_(n)(2)(bib = 1,4-bis(2-methyl-imidazol-1-yl)butane, H2nip = 5-nitroisophthalic acid, H2glu = glutaric acid) were synthesized by the hydrothermal method and characterized by single-crystal X-ray diffraction, elemental analyses, IR and solid-state diffuse-reflection spectra. 1 forms a 2d network with the point symbol of(4~4·6^(2)) and 2d → 2d polythreaded network. 2 constructs the 6-connected 3d network based on the [Cu_(2)(COO)_(2)] dimer with the point symbol of(4~4·6~(10)·8). The energy band gaps(Eg) of 1 and 2 were 2.453 and 2.162 eV, respectively. 1 and 2 present high photocatalytic activity for the degradation of methylene blue under visible light irradiation.

关键词： coordination polymer structure 3d network photocatalysis 1 4-bis(2-methyl-imidazol-1-yl)butane

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Isomerism: Minor Changes in the Bromine Substituent Positioning Lead to Notable differences in Photovoltaic Performance

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CCS Chemistry 2021年第9期3卷 2591-2601页

作者： Huan Wang Liang Han Jiadong Zhou Tao Liu daize Mo Hui Chen Haijian Lai Nan Zheng Zengqi Xie Wenhua Zheng Feng He department of Chemistry Shenzhen Grubbs InstituteSouthern University of Science and TechnologyShenzhen 518055 Faculty of Health Sciences University of MacaoMacao 999078 State Key Laboratory of Luminescent Materials and devices Institute of Polymer Optoelectronic Materials and DevicesSouth China University of TechnologyGuangzhou 510640 Guangdong Provincial Key Laboratory of Catalysis Southern University of Science and TechnologyShenzhen 518055

An isomerism strategy was employed to develop single,end‐group bromine-substituted non‐fullerene two isomeric acceptors,2,2′-((2Z,2′Z)-((12,13-bis(2-ethylhexyl)-3,9-diundecyl-12,13-dihydro-[1,2,5]thiadiazolo[3,4-e]thieno[2,"3′′:4′,5′]thieno[2′,3′:4,5]pyrrolo[3,2-g]thieno[2′,3′:4,5]thieno[3,2-b]indole-2,10-diyl)bis(methanylylidene))bis(4-bromo-3-oxo-2,3-dihydro-1H-inden-1-ylidene)dimalononitrile(BTIC-2Br-β)and 2,2′-((2Z,2′Z)-((12,13-bis(2-ethylhexyl)-3,9-diundecyl-12,13-dihydro-[1,2,5]thiadiazolo[3,4-e]thieno[2,"3′′:4′,5′]thieno[2′,3′:4,5]pyrrolo[3,2-g]thieno[2′,3′:4,5]thieno[3,2-b]indole-2,10-diyl)bis(methanylylidene))bis(5-bromo-3-oxo-2,3-dihydro-1Hinden-1-ylidene)dimalononitrile(BTIC-2Br-γ).

关键词： bromination isomerism miscibility fused-ring electron acceptor 3d network

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