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Robust superamphiphobic coatings with gradient and hierarchical architecture and excellent anti-flashover performances

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Nano Research 2022年第8期15卷 7565-7576页

作者： Yi Xie Wei Xiong Shefiu Kareem Chuxiong Qiu Yongfei Hu Ivan PParkin Shengwu Wang Huayun Wang junwu chen Lee Li Zhi chen Huajun Sun Xiujian Zhao State Key Laboratory of Silicate Materials for Architectures Wuhan University of TechnologyWuhan 430070China Department of Chemistry University College LondonLondon WC1H 0AJUK State Key Laboratory of Advanced Electromagnetic Engineering and Technology(Huazhong University of Science&Technology) Wuhan 430074China State Grid Jiangxi Electric Power CompanyLtd.Electric Power Research InstituteNanchang 330096China Wuhan Shuneng New Material Co. LTDWuhan 430074China

Biomimetic superhydrophobic(SH)coatings have emerged as a promising alternative to traditional room temperature vulcanizing(RTV)silicone rubber coatings for improving the flashover strength of insulators.However,organic contamination occurs in outdoor applications and thus a superamphiphobic(SAP)surface is more desirable but not yet reported for improving flashover performance.Herein,we developed a novel anti-flashover technique by fabricating robust SAP coating with unique gradient and micro-nanoscale hierarchical architecture.The SAP coating was fabricated by sequentially spray-depositing a resin-based primer and a silica-based topcoat on substrates(i.e.,glass slides and insulators).The primer not only functions as an adhesive offering strong adhesion to the substrate but also offers a micromastoid-like structure facilitating the subsequent formation of hierarchical micro-nanostructure.The appropriate spraying pressure leads to a diffusion of the fluorocarbon-modified silica nanoparticles into the primer to form a unique gradient structure,by analogy to inserting bullets into a wood.These features render the SAP coating excellent robustness with strong abrasive resistance,excellent ultraviolet(UV)resistance,and excellent chemical and thermal stability.Pollution flashover property of the SAP coating was explored and compared with that of SH and RTV specimens,from which a novel organic-contamination model to evaluate the flashover performance was proposed.The coated SAP glass insulator demonstrated 42.9%pollution flashover voltage improvement than RTV-coated insulator.These stated unique features reveal the convincing potential of the present SAP coatings to be applied for not only outdoor transmission line insulators for antiflashover but also other fields for self-cleaning,anti-fouling,and anti-icing.

关键词： superamphiphobic coatings superhydrophobic coatings insulator pollution flashover voltage anti-flashover

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混凝土暴露试验的稳定时长与试验分析方法

材料导报 2024年第2期38卷 132-138页

作者：杨绿峰龙凤波孙继玮陈俊武广西大学土木建筑工程学院南宁530004 广西大学工程防灾与结构安全教育部重点实验室南宁530004 中建西部建设建材科学研究院成都610218 华蓝设计有限公司南宁530011

混凝土自然暴露试验通常用于研究混凝土的氯离子扩散系数,但需要选择合适的分析方法,并确定稳定暴露时长。为此,首先系统研究混凝土的氯离子瞬时扩散和平均扩散理论,明确扩散方程中不同参数的时变特性,揭示了瞬时扩散解析解在分析混凝... 详细信息

混凝土自然暴露试验通常用于研究混凝土的氯离子扩散系数,但需要选择合适的分析方法,并确定稳定暴露时长。为此,首先系统研究混凝土的氯离子瞬时扩散和平均扩散理论,明确扩散方程中不同参数的时变特性,揭示了瞬时扩散解析解在分析混凝土中氯离子扩散过程和浓度分布时与平均扩散解析解等价。然后,引入随机数模拟混凝土取样误差,利用蒙特卡洛法分析氯盐环境下混凝土暴露时长、取样误差以及不同回归分析方法对扩散系数计算结果的影响,研究表明瞬时扩散解用于混凝土自然暴露试验分析时容易受到参数迭代初值的影响,导致初始扩散系数计算结果不稳定,而平均扩散解可以避免该问题,因而平均扩散解更适合于混凝土自然暴露试验数据的回归分析。在此基础上,研究确定了不同取样误差下的混凝土稳定暴露时长。最后,通过工程实例分析验证了回归分析方法以及稳定暴露时长在氯盐环境下混凝土自然暴露试验数据分析中的合理性和必要性。

关键词：混凝土氯离子扩散方程初始扩散系数稳定暴露时长

Replacing alkyl side chain of non-fullerene acceptor with siloxane-terminated side chain enables lower surface energy towards optimizing bulk-heterojunction morphology and high photovoltaic performance

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Science China Chemistry 2021年第7期64卷 1208-1218页

作者： Rihang Qiu Zhuhao Wu Suhan Li Haiying Jiang Qian Wang Yinchu chen Xuanchen Liu Lianjie Zhang junwu chen State Key Laboratory of Luminescent Materials&Devices Institute of Polymer Optoelectronic Materials&DevicesGuangzhou 510640China South China University of Technology South China Institute of Collaborative InnovationDongguan 523808China

Towards a good control of the morphology of bulk-heterojunction(BHJ)active layers for polymer solar cells(PSCs),selecting an appropriate side chain for a polymer donor and a nonfullerene acceptor(NFA)is very crucial.In this work,two novel NFAs i-IE-4F and i-IESi-4 F comprising alkyl and siloxane-terminated side chains on the central indacenodithiophene(IDT)core,respectively,were synthesized.Attaching the siloxane-terminated side chain to i-IESi-4 F affords surface energy(γ)of33.32 mN/m,much lower than that of 39.83 mN/m for i-IE-4F,supplying a big chance to tune miscibility with a polymer donor.Two fluorobenzotriazole-based polymer donors J52 and PBZ-2Si bearing alkyl and siloxane-terminated side chains,respectively,showγvalues of 36.08 and 33.10 mN/m,respectively.The estimated Flory-Huggins interaction parameters(χD,A)indicate that the i-IESi-4 F is more miscible than i-IE-4F in pairing with J52 or PBZ-2Si.The resulting i-IESi-4 F-based blend film exhibits low film roughness and accompanies obviously improved BHJ uniformity.In PSCs,the J52:i-IESi-4F and PBZ-2Si:i-IESi-4 F active layers display power conversion efficiencies(PCEs)of 12.67%and 14.54%,respectively,all remarkably higher than PCEs≤7.34%of the i-IE-4F-based active layers.Interestingly,the PBZ-2Si:i-IESi-4 F active layer,a donor:acceptor blend system comprising siloxane-terminated side chains(DSi:ASimatching)with the highest BHJ miscibility due to the combinatory effect of the side chains,shows the highest efficiency,as supported by efficient exciton dissociation,the lowest bimolecular recombination,and the optimal charge transport.Our results demonstrate that attaching siloxane-terminated side chains to NFAs,as a side chain engineering,has big potential in lowering their surface energy towards fine control of BHJ morphology and leading to a better donor:acceptor blend system.

关键词： terminated acceptor donor

Design, synthesis and photovoltaic properties of a series of new acceptor-pended conjugated polymers

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Science China Chemistry 2016年第12期59卷 1583-1592页

作者： Zhihong Wu Yongxiang Zhu Wei Li Yunping Huang junwu chen Chunhui Duan Fei Huang Yong Cao Institute of Polymer Optoelectronic Materials and Devices State Key Laboratory of Luminescent Materials and DevicesSouth China University of Technology

A series of novel acceptor-pended conjugated polymers featuring a newly developed carbazole-derived unit are designed and synthesized. The relationships between chemical structure and optoelectronic properties of the polymers are systematically investigated.The control of UV-Vis absorption spectra and energy levels in resulting polymers are achieved by introducing suitable pended acceptor units. The photovoltaic properties of the resulting polymers are evaluated by blending the polymers with(6,6)-phenyl-C71-butyric acid methyl ester. The resulting solar cells exhibit moderate performances with high open-circuit voltage. Charge transport properties and morphology were investigated to understand the performance of corresponding solar cells.

关键词：领受人悬而未决结合了聚合物聚合物太阳能电池乐队差距精力水平

Low band-gap benzodithiophene-thienothiophenecopolymers: the effect of dual two-dimensional substitutions on optoelectronic properties

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Science China Chemistry 2015年第2期58卷 267-275页

作者： Zhulin Liu Jiangman Sun Yongxiang Zhu Peng Liu Lianjie Zhang junwu chen Fei Huang Yong Cao Institute of Polymer Optoelectronic Materials and Devices State Key Laboratory of Luminescent Materials and DevicesSouth China University of Technology

Two new conjugated copolymers,PBDT-T6-TTF and PBDT-T12-TTF,were derived from a novel 4-fluorobenzoyl thienothiophene(TTF).In addition,two types of benzodithiophene(BDT)units with 2,3-dihexylthienyl(T6)and 2,3-didodecylthienyl(T12)substituents,respectively,were successfully synthesized.The effect of the dual two-dimensional(2D)substitutions of the building blocks upon the optoelectronic properties of the polymers was investigated.Generally,the two polymers exhibited good solubility and broad absorption,showing similar optical band gaps of^1.53 e V.However,PBDT-T6-TTF with its shorter alkyl chain length possessed a larger extinction coefficient in thin solid film.The highest occupied molecular orbital(HOMO)level of PBDT-T6-TTF was located at–5.38 e V while that of PBDT-T12-TTF was at–5.51 e V.In space charge-limitedcurrent(SCLC)measurement,PBDT-T6-TTF and PBDT-T12-TTF displayed respective hole mobilities of 3.0×10–4 and1.6×10–5 cm2 V1 s1.In polymer solar cells,PBDT-T6-TTF and PBDT-T12-TTF showed respective power conversion efficiencies(PCEs)of 2.86%and 1.67%.When 1,8-diiodooctane(DIO)was used as the solvent additive,the PCE of PBDT-T6-TTF was remarkably elevated to 4.85%,but the use of DIO for the PBDT-T12-TTF-blend film resulted in a lower PCE of 0.91%.Atomic force microscopy(AFM)indicated that the superior efficiency of PBDT-T6-TTF with 3%DIO(v/v)should be related to the better continuous phase separation of the blend film.Nevertheless,the morphology of the PBDT-T12-TTF deteriorated when the 3%DIO(v/v)was added.Our results suggest that the alkyl-chain length on the 2D BDT units play an important role in determining the optoelectronic properties of dual 2D BDT-TT-based polymers.

关键词：光电性能二维带隙电源转换效率原子力显微镜光电特性固体薄膜太阳能电池

Silaindacenodithiophene-Based Fused-Ring Non-Fullerene Electron Acceptor for Efficient Polymer Solar Cells

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Chinese Journal of Chemistry 2018年第6期36卷 495-501页

作者： Yaowen Nian Zhen Wang Haiying Jiang Shizhen Feng Suhan Li Lianjie Zhang Yong Cao junwu chen Optoelectronic Materials &. Devices State Key Laboratory of Luminescent Materials & Devices South China University of Technology Guangzhou Guangdong 510640 China

In this work, a new A-D-A type nonfuUerene small molecular acceptor SilDT-IC, with a fused-ring silaindacenodithiophene （SilDT） as D unit and 2-（3-oxo-2,3-dihydroinden-l-ylidene）malononitrile （INCN） as the end A unit, was design and synthesized. The SilDT-IC film shows absorption peak and edge at 695 and 733 nm, respectively. The HOMO and LUMO of SilDT-IC are of -5.47 and -3.78 eV, respectively. Compared with carbon-bridging, the Si-bridging can result in an upper-lying LUMO level of an acceptor, which is benefit to achieve a higher open-circuit voltage in polymer solar cells （PSCs）. Complementary absorption and suitable energy level alignment between SilDT-IC and wide bandgap polymer donor PBDB-T were found. For the PBDB-T：SilDT-IC based inverted PSCs, a D/A ratio of 1 ： 1 was optimal to achieve a power conversion efficiency （PCE） of 7.27%. With thermal annealing （TA） of the blend film, a higher PCE of 8.16% could be realized due to increasing of both short-circuit current density and fill factor. After the TA treatment, hole and electron mobilities were elevated to 3.42 × 10-4 and 1.02 × 10-4 cm2·V-1.s-1, respectively. The results suggest that the SilDT, a Si-bridged fused ring, is a valuable D unit to construct efficient nonfullerene acceptors for PSCs.

关键词： polymer solar cells nonfullerene accepter silaindacenodithiophene thermal annealing

26mA cm^(-2) J_(sc) from organic solar cells with a low-bandgap nonfullerene acceptor

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Science Bulletin 2017年第22期62卷 1494-1496页

作者： Zuo Xiao Xue Jia Dan Li Shizhe Wang Xinjian Geng Feng Liu junwu chen Shangfeng Yang Thomas P.Russell Liming Ding Center for Excellence in Nanoscience (CAS) Key Laboratory of Nanosystem and Hierarchical Fabrication (CAS)National Center for Nanoscience and Technology Department of Materials Science and Engineering University of Science and Technology of China Department of Physics and Astronomy Shanghai Jiaotong University State Key Laboratory of Luminescent Materials and Devices South China University of Technology Department of Polymer Science and Engineering University of Massachusetts

Nonfullerene-based organic solar cells(NFOSCs)have received great interest recently due to their higher performance and greater potential compared with fullerene-based solar cells[1].Power conversion efficiencies(PCEs)over 13% have been realized in single-junction NFOSCs[2].Compared with traditional fullerene acceptors,the greatest advantage of nonfullerene acceptors is their stronger light-harvesting capability in the visible and

关键词： PTB Th sc from organic solar cells with a low-bandgap nonfullerene acceptor DIO PCE

Blade-coated organic solar cells from non-halogenated solvent offer 17%efficiency

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Journal of Semiconductors 2021年第3期42卷 14-17页

作者： Wei Guan Dong Yuan Juntao Wu Xiaobo Zhou Hong Zhao Fei Guo Lianjie Zhang Ke Zhou Wei Ma Wanzhu Cai junwu chen Liming Ding Lintao Hou Guangzhou Key Laboratory of Vacuum Coating Technologies and New Energy Materials Guangdong Provincial Key Laboratory of Optical Fiber Sensing and CommunicationsSiyuan LaboratoryDepartment of PhysicsJinan UniversityGuangzhou 510632China Institute of Polymer Optoelectronic Materials and Devices State Key Laboratory of Luminescent Materials and DevicesSouth China University of TechnologyGuangzhou 510640China State Key Laboratory for Mechanical Behavior of Materials Xi’an Jiaotong UniversityXi’an 710049China Center for Excellence in Nanoscience(CAS) Key Laboratory of Nanosystem and Hierarchical Fabrication(CAS)National Center for Nanoscience and TechnologyBeijing 100190China

Organic solar cell(OSC)has attracted great interests due to its potential applications[1-9].To date,18%power conversion efficiency(PCE)has been achieved in single-junction OSC[10−13],indicating the feasibility of commercialization.This photovoltaic technology currently faces the performance gap between laboratory cells and large-area modules.

关键词： efficiency currently solar

苯基取代苯并二噻吩二酮构建新型聚合物及其光伏性能研究

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化学学报 2024年第3期82卷 257-264页

作者：邓燧楠刘海珍张连杰罗文君罗妹张泽升梁嘉豪王新康陈军武华南理工大学高分子光电材料与器件研究所发光材料与器件国家重点实验室广州510640

随着材料和器件的不断发展,有机光伏(OPV)的器件效率不断提升,但制备仍存在较多额外加工工艺,不利于其大规模生产.如何合理调控活性层材料的溶解性、结晶性和两相形貌来简化器件制备工艺,实现高性能的as-cast器件将十分具有科学意义.本... 详细信息

随着材料和器件的不断发展,有机光伏(OPV)的器件效率不断提升,但制备仍存在较多额外加工工艺,不利于其大规模生产.如何合理调控活性层材料的溶解性、结晶性和两相形貌来简化器件制备工艺,实现高性能的as-cast器件将十分具有科学意义.本工作通过设计合成苯基取代的苯并二噻吩二酮单元(二维BDD)作为共聚单元,制备了三种新型聚合物材料.当二维BDD单元摩尔分数为10%时, FBDT-m10能实现良好的聚集性能和加工性能,与Y6-BO共混制备的as-cast器件就可以得到良好的活性层形貌,最终实现了71.14%的填充因子及16.06%的器件效率.

关键词：芳香取代苯并二噻吩二酮聚合物给体有机太阳电池