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A small molecule based on dithieno[3,2-f:2',3'-h]phthalimide enabling 19.22% efficiency by depressing non-radiative energy loss in ternary organic solar cells

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Journal of Energy Chemistry 2025年第5期104卷 194-201页

作者： Mengjie Li Youmei Qin Huanian Zhang Ji Wan Changhao Xiang Meihua Huang Jianqi Zhang Jie Min Linglong Ye Bin Zhao Key Laboratory of Environmentally Friendly Chemistry and Application of Ministry of Education College of Chemistry Xiangtan University The Institute for Advanced Studies Wuhan University CAS Key Laboratory of Nanosystem and Hierarchical Fabrication National Center for Nanoscience and Technology Key Laboratory for Green Organic Synthesis and Application of Hunan Province Key Laboratory of Polymeric Materials & Application Technology of Hunan Province College of Chemistry Xiangtan University

Ternary blending as one of the most successful strategies has achieved continuous performance breakthroughs in organic solar cells（OSCs） over the past few ***,a small molecule featuring a dithieno[3,2-f:2',3'-h]phthalimide derivative as the intermediate unit,named DTP-C8-R,is designed and utilized as the third component to construct ternary OSCs（TOSCs）.The increased molecular packing of L8-BO as well as the charge transfer excitons between PM6 and DTP-C8-R lead to a very low nonradiative energy loss of 0.179 eV and a high open-circuit voltage(VOC) of 0.910 V in the TOSCs based on the PM6:L8-BO host ***,the DTP-C8-R:PM6:L8-BO film（0.05:0.95:1.2,w/w） possesses better fibrous nanophase separation and the enhanced π-π stacking ordering of the acceptors with a larger crystal coherence length compared with the PM6:L8-BO blend film,so the TOSCs present more efficient exciton dissociation,longer carrier lifetime,faster carrier transport and less charge *** boosts the power conversion efficiency to 19.22% with a short-circuit current density of 27.10 mA *** work demonstrates that the small molecule based on a dithieno[3,2-f:2',3'-h]phthalimide derivative as the minor component is an executable strategy to achieve high-performance TOSCs with high VOC.

关键词： Dithieno[3,2-f:2′,3′-h]phthalimide derivative High open-circuit voltage Low non-radiative energy loss Organic solar cells Small molecule

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Elinvar-Like Effect Induced by High Lattice Distortion in Zr_(6)Ta_(2)O_(17) Ceramics

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Research 2025年第1期2024卷 885-898页

作者： Xiaopeng Hu Qing Liu Sai Liu Yu Zou Jinwei Guo Junyao Wu Wang Zhu Zengsheng Ma Key Laboratory of Key Film Materials&Application for Equipment(Hunan province) School of Materials Science and EngineeringXiangtan UniversityXiangtanHunan 411105China Key Laboratory of Low Dimensional Materials and Application Technology of Ministry of Education School of Materials Science and EngineeringXiangtan UniversityXiangtanHunan 411105China

Super strength and toughness,excellent deformation resistance,and high-temperature service performance are the key factors to determine the practical application of new thermal barrier coatings(TBCs).The limited mobility of dislocations and the internal inherent defects in ceramics will inevitably lead to the decline of strength–plasticity and the reduction of service *** preexisting twin boundaries and stacking faults(SFs)or preparing ceramic materials with high configuration entropy has demonstrated to be an effective strategy for enhancing the mechanical properties of ***,due to the positive thermal expansion coefficient of most ceramics and the remarkable increase of structural disorder at elevated temperature,the problem of elastic softening has become a bottleneck restricting the high-temperature service life of new *** this paper,the deformation behavior of high configuration entropy Zr6Ta2O17 ceramics at 25 to 1,200°C was in situ monitored via digital image correlation technique and three-point bending test platform in high-temperature environment.A remarkable Elinvar-like effect appears in the Zr_(6)Ta_(2)O_(17) *** interestingly,mechanical deformation dominates the severe lattice distortion(deformation twins,SFs)and the disorder–order transition of chemical order at the atomic scale,while temperature can further enhance the degree of lattice distortion and ordering of Zr6Ta2O17 ***,the atomic fluctuations at high temperature promotes the comprehensive improvement of mechanical properties in the Zr6Ta2O17 ceramics.

关键词： elinvar effect decline strength plasticity temperature induced lattice distortion thermal barrier coatings tbcs Zr Ta O ceramics high configuration entropy deformation twins mechanical properties

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Time-dependent color-tunable room temperature phosphorescence from unusual conformational transitions in phenothiazine polymers under UV irradiation

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Science China Chemistry 2025年第3期68卷 1091-1098页

作者： Jiwen Lu Yifan Niu Chanjuan Jin Chengheng Wu Hanyu Wang Yan Guan Ping Wang Xinghe Fan Key Lab of Environment-Friendly Chemistry and Application of Ministry of Education Key Laboratory of Polymeric Materials and Application Technology of Hunan ProvinceKey Laboratory of Advanced Functional Polymer Materials of CollegesUniversities of Hunan ProvinceCollege of ChemistryXiangtan UniversityXiangtan 411105China Beijing National Laboratory for Molecular Sciences Key Laboratory of Polymer Chemistry and Physics of Ministry of EducationCenter for Soft Matter Science and EngineeringCollege of Chemistry and Molecular EngineeringPeking UniversityBeijing 100871China

Achieving color-tunable room-temperature phosphorescence(RTP),especially including blue RTP from a single-component polymer still faces a formidable ***,we wisely choose conformation-dependent phenothiazine with trifluoromethyl substituent as the side group of the phosphor monomer(Cz PT)and then copolymerize it with N-isopropylacrylamide(NIPAM)through photopolymerization to obtain polymers PPCz ***-dependent color-tunable phosphorescence from unusual quasi-equatorial(eq)to quasi-axial(ax)conformers are obtained,and the RTP color changes from orange(550 nm)to blue(470 nm)with phosphorescence lifetime up to 0.96 *** theoretical calculations confirm that the quasi-axial conformer is the preferred structure that facilitates the formation of intramolecular hydrogen bonds on the trifluoromethyl *** EPR spectra illustrate that the persistent UV irradiation generates radical cations to induce the conformational transitions first,followed by photopolymerization immobilizing the ax conformation in PPCz *** of data encryption and anti-counterfeiting are fabricated to show prompt and delayed multicolor *** work affords a simple and feasible avenue for two-dimensional color tunable room temperature phosphorescence from a single-component polymer.

关键词： polymeric room temperature phosphorescence color-tunable phosphorescence conformation-dependent time-dependent blue phosphorescence

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Experimental and numerical study on external explosions of cylindrical versus spherical charges at tunnel entrance

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Defence technology(防务技术) 2025年第4期46卷 227-243页

作者： Dan Luo Jinsheng Hu Anbao Wang Xiao Yu Mengmeng Zhang Meili Yao Chun Li Academy of Military Sciences PLABeijing 100850China Key Laboratory for Green&Advanced Civil Engineering Materials and Application Technology of Hunan Province College of Civil EngineeringHunan UniversityChangsha 410082China

Most of the existing studies on tunnel blast wave are based on spherical or grouped charges, however,conventional weapons are mostly cylindrical rather than spherical. In order to analyze the impact of cylindrical charges on the tunnel blast wave loads and to develop a quantitative calculation method, this study carried out experimental and numerical research. Initially, external explosion experiments were conducted using both 35 kg spherical charges and cylindrical charges with aspect ratio of 4.8 at two different distances from the tunnel entrance. Comparative analysis of the blast wave parameters in the tunnel revealed that the explosive equivalent of the cylindrical charges was significantly higher than that of the spherical charges. To address this, an equivalent coefficient κ based on the spherical charges was proposed for the cylindrical charges. Subsequently, numerical simulations were conducted for the experimental conditions, and the numerical simulation results match the experiments well. Through numerical calculations, the reliability of the equivalent coefficient κ under the experimental conditions was verified, and comparison analysis indicated that the explosion energy of cylindrical charges spreads more radially, resulting in more explosion energy entering the tunnel, which is the fundamental reason for the increase in tunnel blast wave loads. Additionally, analyzing the explosion energy ratio entering the tunnel is an effective method for calculating the equivalent coefficient κ. Finally, through more than one hundred sets of numerical calculation results, the impact of the proportional distance λ and the ratio of charge mass to the tunnel cross-section dimension φ on the equivalence coefficients κ was investigated. An empirical formula for the equivalence coefficient κ was derived through fitting, and the accuracy of the formula was validated through literature experimental results. The research findings of this paper will provide valuable guidance

关键词： Cylindrical charges Tunnel blast wave Equivalent coefficient Empirical formula Experiment and numerical simulation

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Tuning surface reactivity towards high-performance hard carbon in Li/Na/K-ion batteries

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Journal of Energy Chemistry 2025年第4期103卷 27-36页

作者： Wang Zhou Dan Wang Ying Mo Rui Tang Peng Gao Miaomiao Han Shi Chen Keigo Wakabayashi Takeharu Yoshii Hirotomo Nishihara Jilei Liu College of Materials Science and Engineering Hunan Joint International Laboratory of Advanced Materials and Technology of Clean Energy Hunan Province Key Laboratory for Advanced Carbon Materials and Applied Technology Hunan University The Key Laboratory of Micro-nano Energy Materials and Application Technologies University of Hunan Province & College of Physics and Electronic Engineering Hengyang Normal University Joint Key Laboratory of the Ministry of Education Institute of Applied Physics and Materials Engineering University of Macau Institute of Multidisciplinary Research for Advanced Materials Tohoku University Advanced Institute for Materials Research (WPI-AIMR) Tohoku University

Controlling surface chemistry is critically important for improving the initial Coulombic efficiency(ICE)and adsorption capacity of hard carbon anode used in Li/Na/K-ion ***,accurately identifying the types and concentrations of hydrogen/oxygen terminated functional groups(HTFG/OTFGs) and distinguishing their functionalities remain ***,we quantitatively investigated the surface chemistry on hard carbon via ultra-high temperature programed desorption measurements,and uncovered the role of HTFG/OTFGs in influencing ICE and adsorption capacity in Li/Na/K-ions *** C-H group is found to be dominant species on the surface of hard carbon,and presents a positive correlation with ICE values and adsorption *** low reactivity of C-H group with both electrolyte salt and solvent results in the formation of thinner and highly conducive solid electrolyte interphase(SEI) layer,which benefit for the enhanced ICE and improved Li/Na/K-ions diffusion across SEI ***,the pimping trapping effect of C-H groups allows the adsorbed Li/Na/K-ions to migrate into graphitic interlayer quickly,enhancing the slope *** fabricating a C-H group-rich surface chemistry on hard carbon,a high ICE value and satisfactory specific capacity have been *** findings enrich our understanding of the surface chemistry-induced interfacial reaction,which effectively guides the rational design of high-performance hard carbon.

关键词： Adsorption capacity C–H bond Hard carbon Initial coulombic efficiency Surface chemistry

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A universal strategy for achieving dual cross-linked networks to obtain ultralong polymeric room temperature phosphorescence

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Science China Chemistry 2023年第4期66卷 1161-1168页

作者： Yifan Niu Yan Guan Chunye Long Chaofan Ren Jiwen Lu Chanjuan Jin Ping Wang Xinghe Fan He-Lou Xie Key Laboratory of Environment-friendly Chemistry and Application of Ministry of Education Key Laboratory of Polymeric Materials and Application Technology of Hunan Province and Key Laboratory of Advanced Functional Polymer Materials of Colleges and Universities of Hunan ProvinceCollege of ChemistryXiangtan UniversityXiangtan 411105China Beijing National Laboratory for Molecular Sciences Key Laboratory of Polymer Chemistry and Physics of Ministry of EducationCenter for Soft Matter Science and EngineeringCollege of Chemistry and Molecular EngineeringPeking UniversityBeijing 100871China

Efficient polymeric room-temperature phosphorescence(PRTP)with excellent processability and flexibility is highly desirable but still faces formidable ***,a general strategy is developed for efficient PRTP through photo-polymerization of phosphor monomers and N-isopropylacrylamide(NIPAM)spontaneously without a *** ultralong lifetime of 3.54 s with afterglow duration time of 25 s and decent phosphorescent quantum efficiency of 13%are *** efficient PRTP has been demonstrated to be derived from the synergistic effect of the covalent and hydrogen bonds networks formed through photo-polymerization of *** electron paramagnetic resonance(EPR)spectra confirmed that methyl radicals are generated under the irradiation of ultraviolet light and promote the formation of covalent cross-linking *** strategy has also been proved to be generalizable to several other phosphor ***,the polymer films display ultrahigh temperature resistance with long afterglows even at 140℃ and unexampled ultralong lifetime of 2.45 s in aqueous *** work provides a simple and feasible avenue to obtain efficient PRTP.

关键词： universal strategy ultralong polymeric room temperature phosphorescence dual cross-linked networks photopolymerization crosslinker

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A study of MySQL protocol-based database proxy approval system for fortress machine

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International Journal of Data Science 2025年第1期10卷 96-117页

作者： Zhang, Xian Luo, Xinhui Yin, Dong Qu, Taiguo Li, Hao Huaihua University Huaihua418000 China Key Laboratory of Intelligent Control Technology for Wuling-Mountain Ecological Agriculture in Hunan Province Huaihua418000 China Key Laboratory of Wuling-Mountain Health Big Data Intelligent Processing and Application in Hunan Province Universities Hunan Huaihua418000 China Huaihua Tourism School Hunan Huaihua418099 China

With the increase of enterprise informatisation, database security and compliance operation management have become increasingly important. Therefore, it is essential to design an efficient database proxy approval system. In this paper, we develop a database proxy approval system based on the MySQL protocol for fortress machines, which provides a real-time customised configuration scheme for high-risk commands, designs a real-time approval process for six types of high-risk commands, and creates a simple and efficient matching algorithm for high-risk commands. We designed a large number of experiments to test the system’s connection success rate, operation stability, response time, CPU resource consumption, matching algorithm performance, and other aspects. The experimental results show that this database proxy approval system has good configuration flexibility, high accuracy, and good time performance. This system has a wide range of applications in electric power, finance, petroleum, and other fields. © 2025 Inderscience Enterprises Ltd.

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Schiff-base polymer derived FeCo-N-doped porous carbon flowers as bifunctional oxygen electrocatalyst for long-life rechargeable zinc-air batteries

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Journal of Energy Chemistry 2023年第1期76卷 470-478,I0012页

作者： Yusong Deng Jiahui Zheng Bei Liu Huaming Li Mei Yang Zhiyu Wang College of Chemistry Xiangtan UniversityXiangtan 411105HunanChina Key Lab of Environment-Friendly Chemistry and Application in Ministry of Education Key Laboratory of Polymeric Materials&Application Technology of Hunan ProvinceKey Laboratory of Advanced Functional Polymeric Materials of College of Hunan ProvinceXiangtan UniversityXiangtan 411105HunanChina State Key Lab of Fine Chemicals Liaoning Key Lab for Energy Materials and Chemical EngineeringPSU-DUT Joint Center for Energy ResearchSchool of Chemical Engineering Dalian University of TechnologyDalian 116024LiaoningChina

Rational design and exploration of low-cost and robust bifunctional oxygen electrocatalysts are vitally important for developing high-performance zinc-air batteries(ZABs).Herein,we reported a facile yet cost-efficient approach to construct a bifunctional oxygen reduction reaction(ORR)/oxygen evolution reaction(OER)electrocatalyst composed of N-doped porous carbon nanosheet flowers decorated with Fe Co nanoparticles(Fe Co/N-CF).Rational design of this catalyst is achieved by designing Schiff-base polymer with unique molecular structure via hydrogen bonding of cyanuramide and terephthalaldehyde polycondensate in the presence of metal *** exhibits excellent activity and stability for electrocatalysis of ORR/OER,enabling ZAB with a high peak power density of 172 m W cm^(-2)and a large specific capacity of 811 m A h g^(-1)Znat large *** rechargeable ZAB demonstrates excellent durability for 1000 h with slight voltage decay,far outperforming a couple of precious Pt/Ir-based *** functional theory(DFT)calculations reveal that high activity of bimetallic Fe Co stems from enhanced O_(2)and OH-adsorption and accelerated O_(2)dissociation by OAO bond activation.

关键词： Rechargeable zinc-air batteries Oxygen electrocatalyst Schiff-base polymer Bimetallic FeCo N-doped porous carbon

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Multi-cyclic Swelling for Self-regulated Growth of Covalently Crosslinked Polymers

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Chinese Journal of Polymer Science 2025年第3期43卷 509-516页

作者： De-Fu Zhu Hong Wang Jian Chen Xin-Hong Xiong Jia-Xi Cui Yangtze Delta Region Institute(Huzhou) University of Electronic Science and Technology of ChinaHuzhou 313001China Key Laboratory of Theoretical Organic Chemistry and Functional Molecule of Ministry of Education Hunan Provincial Key Laboratory of Controllable Preparation and Functional Application of Fine PolymersHunan Provincial Key Lab of Advanced Materials for New Energy Storage and ConversionHunan Province College Key Laboratory of QSAR/QSPRSchool of Chemistry and Chemical EngineeringHunan University of Science and TechnologyXiangtan 411201China Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of China ChengduChengdu 611731China

Organisms are capable of self-growth through the integration of the nutrients provided by the external *** process slows down when they *** this study,we mimicked this self-regulated growth via a simple swelling-polymerization strategy in which the stretching polymer chains in the original networks provide entropic elasticity to restrict growth in high growth *** typical covalently crosslinked polymers,such as acrylamide-based hydrogels and HBA-based elastomers,as examples,we demonstrate that the crosslinked polymers can absorb polymerizable compounds through a swelling-polymerization process to expand their sizes,but the growth extent becomes smaller with increasing growth cycle until reaching a *** addition to their size,these materials become stiffer and exhibit less swelling ability in *** work not only provides a new growing mode to tune the properties of crosslinked polymers but also discloses the underlying mechanism of crosslinked polymers in multi-cyclic swelling conditions.

关键词： Crosslinked polymers Swelling Self-growing Mechanical property

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Unprecedented stepwise electron transfer and photocatalysis in supramolecular assembly derived hybrid single-layer two-dimensional nanosheets in water

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Chinese Chemical Letters 2025年第4期36卷 199-204页

作者： Yan Fan Jiao Tan Cuijuan Zou Xuliang Hu Xing Feng Xin-Long Ni Key Laboratory of Chemical Biology and Traditional Chinese Medicine Ministry of Educational of ChinaKey Laboratory of the Assembly and Application of Organic Functional Molecules of Hunan ProvinceHunan Normal UniversityChangsha 410081China Institute of interdisciplinary Studies of Hunan normal University Changsha 410081China Guangdong Provincial Key Laboratory of Functional Soft Condensed Matter School of Material and EnergyGuangdong University of TechnologyGuangzhou 510006China

Herein,a simple and effective outer-surface interactions assisted supramolecular hierarchical assembly has been first exploited to uniformly distribute tungstosilicic acid(TSA)inside the porous structure of cucurbit[10]uril-based single-layer 2D supramolecular-organic-frameworks(Q[10]-SOFs)in ***,the 2D Q[10]-SOFs can further serve as light harvesting antenna,achieving fast energy transfer to the embedded redox-active TSA upon photoexcitation,resulting in efficient visible light-driven selective oxidation of benzyl alcohols into the corresponding aldehydes in high yield at room *** studies revealed that the integrated of 2D Q[10]-SOFs and TSA played a key role in the catalytic process,due to the presence of a novel stepwise electron transfer route in the single-layer hybrid 2D structures.

关键词： Hybrid single-layer 2D materials Host-guest recognition Outer-surface interactions Photocatalysis

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