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Preparation and Properties of High-performance Polyimide Copolymer Fibers Derived from 5-Amino-2-(2-hydroxy-5-aminobenzene)-benzoxazole

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chinese Journal of polymer science 2019年第5期37卷 478-492页

作者： Xue-Min Dai Hong gao Ran Zhang Zhi-Jun Du Tong-Fei Shi xiang-Ling Ji Xue-Peng Qiu Yong-Feng Men state key laboratory of {3. physics and chemistry Changchun Institute of Applied ChemistryChinese Academy of Sciences polymer Composites Engineering laboratory Changchun Institute of Applied ChemistryChinese Academy of Sciences University of chinese academy of sciences china academy of Space Technology

A series of polyamic acid copolymers(co-PAAs) with para-hydroxyl groups was synthesized using two diamine monomers,namely p-phenylenediamine(p-PDA) and 5-amino-2-(2-hydroxy-5-aminobenzene)-benzoxazole(m-pHBOA), of different molar ratios through copolymerization with 3.3.,4,4′-biphenyltetracarboxylic dianhydride(BPDA) in N,N-dimethyacetamine(DMAc). The co-PAA solutions were used to fabricate fibers by dry-jet wet spinning, and thermal imidization was conducted to obtain polyimide copolymer(coPI) fibers. The effects of the m-pHBOA moiety on {3. packing and physical properties of the prepared fibers were *** transform infrared(FTIR) spectroscopic results confirmed that intra/inter{3. hydrogen bonds originated from the hydroxyl group and the nitrogen atom of the benzoxazole group and/or the hydroxyl group and the oxygen atom of the carbonyl group of cyclic imide. As-prepared PI fibers displayed homogenous and smooth surface and uniform diameter. The glass transition temperatures(Tgs) of PI fibers were within 3.1-3.7 °C. The polyimide fibers showed 5% weight loss temperature(T5%) at above 510 °C in air. Twodimensional wide-angle X-ray diffraction(WXRD) patterns indicated that the homo-PI and co-PI fibers presented regularly arranged polymer chains along the fiber axial direction. The ordered {3. packing along the transversal direction was destroyed by introducing the m-pHBOA moiety. Moreover, the crystallinity and orientation factors increased with increasing draw ratio. Small-angle X-ray scattering(SAXS) results showed that it is beneficial to reduce defects in the fibers by increasing the draw ratio. The resultant PI fibers exhibited excellent mechanical properties with fracture strength and initial modulus of 2.48 and 89.73.GPa, respectively, when the molar ratio of p-PDA/m-pHBOA was 5/5 and the draw ratio was 3.0.

关键词： Polyimide fiber Phenylenebenzoxazole Hydroxyl group Hydrogen bonding

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Organic photovoltaic cell with 17% efficiency and superior processability

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National science Review 2020年第7期7卷 1239-1246页

作者： Yong Cui Huifeng Yao Ling Hong Tao Zhang Yabing Tang Baojun Lin Kaihu xian Bowei gao Cunbin An Pengqing Bi Wei Ma Jianhui Hou state key laboratory of {3. physics and chemistry Beijing National Laboratory for Molecular Sciences CAS Research/Education Center for Excellence in Molecular Sciences Institute of Chemistry Chinese Academy of Sciences University of chinese academy of sciences state key laboratory for Mechanical Behavior of Materials Xi'an Jiaotong University

The development of organic photoactive materials, especially the newly emerging non-fullerene electron acceptors(NFAs), has enabled rapid progress in organic photovoltaic(OPV) cells in recent *** the power conversion efficiencies(PCEs) of the top-performance OPV cells have surpassed 16%,the devices are usually fabricated via a spin-coating method and are not suitable for large-area ***, we demonstrate that the fine-modification of the flexible side chains of NFAs can yield 17% PCE for OPV cells. More crucially, as the optimal NFA has a suitable solubility and thus a desirable morphology, the high efficiencies of spin-coated devices can be maintained when using scalable blade-coating processing technology. Our results suggest that optimization of the chemical structures of the OPV materials can improve device performance. This has great significance in larger-area production technologies that provide important scientific insights for the commercialization of OPV cells.

关键词： organic photovoltaic cells power conversion efficiency scalable large-area production processability non-fullerene acceptor

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Critical Role of molecular Electrostatic Potential on Charge Generation in Organic Solar Cells

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chinese Journal of chemistry 2018年第6期36卷 491-494页

作者： Huifeng Yao Deping Qian Hao Zhang Yunpeng Qin Bowei Xu Yong Cui Runnan Yu Feng gao Jianhui Hou Beijing National laboratory for molecular {3. State Key Laboratory of Polymer Physics and Chemistry CAS Research/Education Center for Excellence in Molecular Sciences Institute of Chemistry Chinese Academy of Sciences Beijing 100190 China Department of physics Chemistry and Biology (IFM) Linkoping University Linkoping 58183 Sweden University of chinese academy of sciences Beijing 100049 China

Revealing the charge generation is a crucial step to understand the organic photovoltaics. Recent development in non-fullerene organic solar cells （OSCs） indicates efficient charge separation even with negligible energetic offset between the donor and acceptor materials. These new findings trigger a critical question concerning the charge separation mechanism in OSCs, traditionally believed to result from sufficient energetic offset between the polymer donor and fullerene acceptor. We propose a new mechanism, which involves the molecular electrostatic potential, to explain efficient charge separation in non-fullerene OSCs. Together with the new mechanism, we demonstrate a record efficiency of -12% for systems with negligible energetic offset between donor and acceptor materials. Our analysis also rationalizes different requirement of the energetic offset between fullerene-based and non-fullerene OSCs, and paves the way for further design of OSC materials with both high photocurrent and high photovottage at the same time.

关键词： organic solar cells non-fullerene acceptor molecular electrostatic potential exciton dissociation

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Effects of filler loading and surface modification on electrical and thermal properties of epoxy/montmorillonite composite

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chinese physics B 2018年第11期27卷 332-339页

作者： Zi-Rui Jia Zhen-Guo gao Di Lan Yong-Hong Cheng Guang-Lei Wu Hong-jing Wu School of science Northwestern Polytechnical UniversityXi'an 710072China center of Nanomaterials for Renewable Energy(CNRE) State Key Laboratory of Electrical Insulation and Power EquipmentSchool of Electrical EngineeringXi'an 3iaotong UniversityXi'an 710049China institute of Materials for Energy and Environment State Key Laboratory Breeding Based of New Fiber Materials and Modem Textile College of Materials Science and EngineeringQingdao UniversityQingdao 266071China

Epoxy-based composites containing montmorillonite(MMT)modified by silylation reaction withγ-aminopropyltriethoxysilane(γ-APTES)and 3.(glycidyloxypropyl)trimethoxysilane(GPTMS)are successfully *** effects of filler loading and surface modification on the electrical and thermal properties of the epoxy/MMT composites are *** with the pure epoxy resin,the epoxy/MMT composite,whether MMT is surface-treated or not,shows low dielectric permittivity,low dielectric loss,and enhanced dielectric *** MMT in the epoxy/MMT composite also influences the thermal properties of the composite by improving the thermal conductivity and *** functionalization of MMT not only conduces to the better dispersion of the nanoparticles,but also significantly affects the electric and thermal properties of the hybrid by influencing the interfaces between MMT and epoxy *** interfaces are good for enhancing the electric and thermal properties of *** is more,the MMT modified with GPTMS rather thanγ-APTES is found to have greater influence on improving the interface between the MMT filler and polymer matrices,thus resulting in lower dielectric loss,lower electric conductivity,higher breakdown strength,lower thermal conductivity,and higher thermal stability.

关键词： modified epoxy resin surface modification electric property thermal property

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Bacterial Cellulose Composite Solid polymer Electrolyte With High Tensile Strength and Lithium Dendrite Inhibition for Long Life Battery

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Energy & Environmental Materials 2021年第3期4卷 434-443页

作者： Yuhan Li Zongjie Sun Dongyu Liu Shiyao Lu Fei Li Guoxin gao Min Zhu Mingtao Li Yanfeng Zhang Huaitian Bu Zhiyu Jia Shujiang Ding Department of Applied chemistry School of ChemistryXi’an Key Laboratory of Sustainable Energy Materials ChemistryMOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed MatterState Key Laboratory of Electrical Insulation and Power EquipmentXi’an Jiaotong UniversityXi’an 710049China International Research center for Renewable Energy State Key Laboratory of Multiphase Flow in Power EngineeringXi’an Jiaotong UniversityXi’an 710049China Department of Materials and Nanotechnology SINTEF IndustryForskningsveien 1Oslo 0373Norway School of chemistry and Chemical Engineering MOE Key Laboratory of Cluster ScienceBeijing Institute of TechnologyBeijing 100081China

The development of metallic lithium anode is restrained by lithium dendrite growth during *** solid polymer electrolyte with high mechanical strength and lithium ion conductivity could be applied to inhibit lithium dendrite *** prepare the high-performance solid polymer electrolyte,the environment-friendly and cheap bacterial cellulose(BC)is used as filler incorporating with PEO-based electrolyte owing to good mechanical properties and Li salts ***/Li TFSI/BC composite solid polymer electrolytes(CSPE)are prepared easily by aqueous mi{3.ng in *** lithium ion transference number of PEO/Li TFSI/BC CSPE is 0.57,which is higher than PEO/Li TFSI solid polymer electrolyte(SPE)(0.409).The PEO/Li TFSI/BC CSPE exhibits larger tensile strength(4.43.MPa)than PEO/Li TFSI SPE(1.3. MPa).The electrochemical window of composite electrolyte is widened 1.43.V by adding *** functional theory calculations indicate that flex of PEO chains around Li atoms is suppressed,suggesting the enhanced lithium ion *** molecular orbitals results suggest that an unfavorable intermolecular charge transfer lead to achieve higher potential for BC composite *** solid-state Li metal battery with PEO/Li TFSI/BC CSPE delivers longer cycle life for 600 cycles than PEO/Li TFSI SPE battery(50 cycles).Li symmetrical battery using PEO/Li TFSI/BC CSPE could be stable for 1160 h.

关键词： all solid-state battery bacterial cellulose composite polymer electrolyte DFT calculations HOMO and LUMO

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基于3.4-二氰基噻吩的宽带隙共轭聚合物的设计合成与光伏应用

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高分子学报 2020年第6期51卷 620-631,I0004页

作者：张拨余永高刘治田刘熙段春晖黄飞武汉工程大学材料科学与工程学院光电与新能源材料研究所武汉430205 华南理工大学发光材料与器件国家重点实验室高分子光电材料与器件研究所广州510640 五邑大学纺织材料与工程学院江门529020

利用3.4-二氰基噻吩(DCT)为电子受体单元,苯并双噻吩(BDT)为电子给体单元,并结合不同侧链取代的噻吩为π桥,设计合成了一系列新型宽带隙共轭聚合物:PB3.CN-C3.、PB3.CN-C3.、PB3.CN-C3.-R以及PB3.CN-C40.这些聚合物具有较宽的光学带隙(>... 详细信息

利用3.4-二氰基噻吩(DCT)为电子受体单元,苯并双噻吩(BDT)为电子给体单元,并结合不同侧链取代的噻吩为π桥,设计合成了一系列新型宽带隙共轭聚合物:PB3.CN-C3.、PB3.CN-C3.、PB3.CN-C3.-R以及PB3.CN-C40.这些聚合物具有较宽的光学带隙(>1.8 eV)、较深的最高占有分子轨道(HOMO)能级.与非富勒烯受体(IT-4F)结合制备了有机太阳电池器件,其中聚合物PB3.CN-C40实现了高达11.2%的能量转换效率(PCE),其开路电压(Voc)为0.92 V,短路电流密度(Jsc)为18.9 mA cm-2,填充因子(FF)为0.64,是目前文献报道基于氰基噻吩类聚合物材料的最好结果.同时,该体系具有低至0.6 eV的能量损失.这些结果表明DCT是一种极具潜力的实现宽带隙、深HOMO能级共轭聚合物的构筑单元,有望实现更高能量转换效率的有机太阳电池.

关键词：有机太阳电池共轭聚合物宽带隙给体材料 3 4-二氰基噻吩

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Quantitative evaluation of space charge effects of laser-cooled three-dimensional ion system on a secular motion period scale

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chinese physics B 2018年第4期27卷 292-298页

作者： Li-Jun Du Hong-Fang Song Shao-Long Chen Yao Huang xin Tong Hua Guan Ke-Lin gao china academy of Space Technology (xi'an) Xi'an 710100 China state key laboratory of Magnetic Resonance and Atomic and {3. physics Wuhan Institute of Physics and Mathematics Chinese Academy of Sciences Wuhan 430071 China key laboratory of Atomic Frequency Standards Wuhan Institute of Physics and Mathematics Chinese Academy of Sciences Wuhan 430071 China center for Cold Atom physics Chinese Academy of Sciences Wuhan 430071 China University of chinese academy of sciences Beijing 100049 China

In this paper,we introduce a method of quantitatively evaluating and controlling the space charge effect of a lasercooled three-dimensional（3.D） ion system in a linear Paul *** relationship among cooling efficiency,ion quantity,and trapping strength is analyzed quantitatively,and the dynamic space distribution and temporal evolution of the 3.D ion system on a secular motion period time scale in the cooling process are *** ion number influences the eigen-micromotion feature of the ion *** trapping parameter q is ～ 0.3.relatively ideal cooling efficiency and equilibrium temperature can be *** decrease of axial electrostatic potential is helpful in reducing the micromotion heating effect and the degradation in the total *** a single secular motion period under different cooling conditions,ions transform from the cloud state（each ion disperses throughout the envelope of the ion system） to the liquid state（each ion is concentrated at a specific location in the ion system） and then to the crystal state（each ion is subjected to a fixed motion track）.These results are conducive to long-term storage and precise control,motion effect suppression,high-efficiency cooling,and increasing the precision of spectroscopy for a 3.D ion system.

关键词： space charge effects cooling dynamics ion trajectory ion energy

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Non-fullerene Acceptors with a Thieno[3.4-c]pyrrole-4,6-dione(TPD) Core for Efficient Organic Solar Cells

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chinese Journal of polymer science 2019年第10期37卷 1005-1014,I0005页

作者： Shi-Zhe Geng Wei-Tao Yang Jian gao Shui-xing Li Min-Min Shi Tsz-Ki Lau xin-Hui Lu Chang-Zhi Li Hong-Zheng Chen key laboratory of Macromolecular Synthesis and Functionalization(Ministry of Education) State Key Laboratory of Silicon MaterialsDepartment of Polymer Science and EngineeringZhejiang UniversityHangzhou 310027China Department of physics The Chinese University of Hong KongNew TerritoriesHong KongChina

To achieve the red-shifted absorptions and appropriate energy levels of A-D-A type non-fullerene acceptors(NFAs), in this work, we design and synthesize two new NFAs, named TPDCIC and TPDCNC, whose electron-donating(D) unit is constructed by a thieno[3.4-c]pyrrole-4,6-dione(TPD) core attached to two cyclopentadithiophene(CPDT) moieties at both sides, and the electronaccepting(A) end-groups are 2-(3.oxo-2,3.dihydroinden-1-ylidene)malononitrile(IC) and 2-(3.oxo-2,3.dihydro-1 H-cyclopenta[b]naphthalen-1-ylidene)malononitrile(NC), respectively. Benefiting from TPD core, which easily forms quinoid structure and O···H or O···S intramolecular noncovalent interactions, TPDCIC and TPDCNC show more delocalization of π-electrons and perfect planar molecular geometries, giving the absorption ranges extended to 822 and 852 nm, respectively. Furthermore, the highest occupied molecular orbital(HOMO) levels of TPDCIC and TPDCNC remain relatively low-lying due to the electronegativity of the carbonyl groups on TPD core. Considering that the absorptions and energy levels of the two NFAs match well with those of a widely used {3. donor, PBDB-T, we fabricate two kinds of organic solar cells(OSCs) based on the PBDB-T:TPDCIC and PBDB-T:TPDCNC blended films, respectively. Through a series of optimizations, the TPDCIC-based devices yield an impressing power conversion efficiency(PCE)of 10.12% with a large short-circuit current density(JSC) of 18.16 mA·cm-2, and the TPDCNC-based ones exhibit a comparable PCE of9.80% with a JSC of 17.40 mA·cm-2. Our work is the first report of the TPD-core-based A-D-A type NFAs, providing a good reference for the molecular design of high-performance NFAs.

关键词： Non-fullerene acceptors (NFAs) Organic solar cells (OSCs) Thieno[3.4-c]pyrrole-4,6-dione (TPD) Narrow bandgap Energy levels

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Host-Guest Strategy Enabling Nonhalogenated Solvent Processing for High-Performance All-polymer Hosted Solar Cells

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chinese Journal of chemistry 2023年第9期41卷 1066-1074页

作者： Yuting Huang Haiyang Chen Qunping Fan Ziyuan Chen Junyuan Ding Heyi Yang Zhe Sun Rui Zhang Weijie Chen Changduk Yang Feng gao Yaowen Li laboratory of Advanced Optoelectronic Materials Suzhou Key Laboratory of Novel Semiconductor-optoelectronics Materials and DevicesCollege of ChemistryChemical Engineering and Materials ScienceSoochow UniversitySuzhouJiangsu 215123China Jiangsu key laboratory of Advanced Negative Carbon Technologies Soochow UniversitySuzhouJiangsu 215123China state and Local Joint Engineering laboratory for Novel Functional polymeric Materials Jiangsu Key Laboratory of Advanced Functional Polymer Design and ApplicationCollege of ChemistryChemical Engineering and Materials ScienceSoochow UniversitySuzhouJiangsu 215123China state key laboratory for Mechanical Behavior of Materials Xi'an Jiaotong UniversityXi'anShaanxi 710049China Department of Energy Engineering School of Energy and Chemical EngineeringPerovtronics Research CenterLow Dimensional Carbon Materials CenterUlsan National Institute of Science and Technology(UNIST)UlsanRepublic of Korea Department of physics Chemistry and Biology(IFM)Linkoping UniversityLinkopingSweden

The power conversion efficiencies(PCEs)of all-polymer solar cells(all-PSCs),usually processed from low-boiling-point and toxic sol-vents,have reached high values of 18%.However,poor miscibility and uncontrollable crystallinity in polymer blends lead to a nota-ble drop in the PCEs when using green solvents,limiting the practical development of ***,a third component(guest)BTO was employed to optimize the miscibility and enhance the crystallinity of PM6/PY2Se-F host film processed from green solvent toluene(TL),which can effectively suppress the excessive aggregation of PY2Se-F and facilitate a nano-scale interpenetrating net-work morphology for exciton dissociation and charge *** a result,TL-processed all-polymer hosted solar cells(all-PHSCs)exhibited an impressive PCE of 17.01%.Moreover,the strong molecular interaction between the host and guest molecules also en-hances the thermal stability of the *** host-guest strategy provides a unique approach to developing high-efficiency and stable all-PHSCs processed from green solvents,paving the way for the industrial development of all-PHSCs.

关键词： All-polymer solar cells Host-guest systems Crystal engineering Nonhalogenated green solvent Stability Morphology Miscibility Ternary blend solar cells

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Surface-oxidation-mediated construction of Ppy@VNO/NG core-shell host targeting highly capacitive and durable negative electrode for supercapacitors

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science china Materials 2021年第9期64卷 2148-2162页

作者： Wei Sun Guohua gao Guangming Wu Zhengwei You state key laboratory for Modification of Chemical Fibers and {3. Materials Shanghai Belt and Road Joint Laboratory of Advanced Fiber and Low-dimension Materials(Donghua University)College of Materials Science and EngineeringDonghua UniveristyShanghai 201620China Shanghai key laboratory of Special Artificial Microstructure Materials and Technology School of Physics Science and EngineeringTongji UniversityShanghai 200092China state key laboratory of {3. Engineering of polymers Fudan UniversityShanghai 200433China

Vanadium nitride(VN)-based materials have been investigated as negative electrode materials for supercapacitors(SCs)owing to their high theoretical capacitances and suitable negative potential ***,viable VNbased negative electrode materials suffer from irreversible electrochemical oxidation of the soluble vanadium species,leading to rapid capacitance fading when operated in aqueous *** a versatile approach to enhance the stability of VN in aqueous electrolytes is still a ***,an interface engineering strategy is developed to intentionally introduce surface nanolayers of vanadium oxides(VO_(x))as a reactive template on the VN surface to formulate welldesigned polypyrrole@VNO(Ppy@VNO)core-shell nanowires(NWs)incorporated into a 3. porous N-doped graphene(NG)hybrid aerogel as a durable negative electrode for *** and theoretical investigations reveal that the in-situ constructed Ppy@VNO core-shell host can offer more efficient pathways for rapid electron/ion transport and accessible electroactive *** importantly,a reversible surface redox reaction is realized through the transformation of the valence state of V,and a long cyclic stability is *** Ppy@VNO/NG hybrid aerogel can deliver a high specific capacitance of 650 F g^(-1) at 1 A g^(-1) with approximately 70.7%capacitance retention(up to the twenty-fold current density),and an excellent cycling stability without any capacitance decay after 10,000 cycles at both low and high current densities(1 and 10 A g^(-1),respectively).This work paves the way for the development of advanced electrode materials for SCs.

关键词： VN-based negative electrode materials interface engineering core-shell nanostructure valence state transformation long-term cycling stability

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