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Substantial thermoelectric enhancement achieved by manipulating the band structure and dislocations in Ag and La co-doped SnTe

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Journal of Advanced Ceramics 2021年第4期10卷 860-870页

作者： Wenjing XU Zhongwei ZHANG chengyan LIU Jie GAO Zhenyuan YE Chunguang chen Ying peng Xiaobo BAI Lei MIAO Guangxi Key Laboratory of Information Material Guangxi Collaborative Innovation Center of Structure and Property for New Energy and MaterialsSchool of Material Science and EngineeringGuilin University of Electronic TechnologyGuilin 541004China Department of Materials Science and Engineering SIT Research LaboratoriesInnovative Global ProgramFaculty of EngineeringShibaura Institute of TechnologyTokyo 135-8548Japan

Eco-friendly SnTe based thermoelectric materials are intensively studied recently as candidates to replace PbTe;yet the thermoelectric performance of SnTe is suppressed by its intrinsically high carrier concentration and high thermal *** this work,we confirm that the Ag and La co-doping can be applied to simultaneously enhance the power factor and reduce the thermal conductivity,contributing to a final promotion of figure of *** one hand,the carrier concentration and band offset between valence bands are concurrently reduced,promoting the power factor to a highest value of-2436μW·m^(-1)·K^(-2) at 873 *** the other hand,lots of dislocations(~3.16×10^(7)mm^(-2))associated with impurity precipitates are generated,resulting in the decline of thermal conductivity to a minimum value of 1.87 W·m^(-1)·K^(-1) at 873 *** a result,a substantial thermoelectric performance enhancement up to zT≈1.0 at 873 K is obtained for the sample Sn0.94Ag0.09La0.05Te,which is twice that of the pristine SnTe(zT≈0.49 at 873 K).This strategy of synergistic manipulation of electronic band and microstructures via introducing rare earth elements could be applied to other systems to improve thermoelectric performance.

关键词： SnTe band convergence dislocation Ag and La co-doping thermoelectric performance

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Melt polymerization synthesis of a class of robust self-shaped olefin-linked COF foams as high-efficiency separators

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Science China Chemistry 2022年第6期65卷 1173-1184页

作者： penghui Zhang Zhifang Wang Yi Yang Sa Wang Ting Wang Jinjin Liu peng cheng Yao chen Zhenjie Zhang State Key Laboratory of Medicinal Chemical biology College of ChemistryNankai UniversityTianjin300071China Key Laboratory of Advanced Energy Materials Chemistry Ministry of EducationNankai UniversityTianjin300071China College of Pharmacy Nankai UniversityTianjin300071China Renewable Energy Conversion and Storage Center Nankai UniversityTianjin300071China

The practical applications of crystalline porous materials toward industrial separations require shaping them into robust monoliths(e.g., foams). The current methods are often complicated, environmentally unfriendly, and unscalable, significantly hampering their practical application. Herein, we report a scalable, facile “one-step thermomolding” method to fabricate a class of hierarchically olefin-linked covalent organic framework(COF) foams via melt polymerization. The obtained pure COF foams possess higher crystallinity and porosity than literature, good moldability, and processability, greatly benefiting their practical applications(e.g., efficient oil-water separation with 99% removal efficiency and >100 cycle reusability). Moreover, a COF exhibiting the smallest(0.58 nm) eclipsed stacking pore among all 2-dimensional COFs with neutral skeletons is first fabricated via this protocol, demonstrating good C2 H2 purification performance and recyclability, surpassing the current benchmark materials. We believe that this facile fabrication strategy can promote access to a broad diversity of new COF foams and enlighten further avenues for green routes to large-scale synthesis and usage of COFs.

关键词： covalent organic framework separation foam melt polymerization

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Superresolution structured illumination microscopy reconstruction algorithms:a review

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Light(Science & Applications) 2023年第8期12卷 1510-1543页

作者： Xin chen Suyi Zhong Yiwei Hou Ruijie Cao Wenyi Wang Dong Li Qionghai Dai Donghyun Kim peng Xi Department of Biomedical Engineering College of Future TechnologyPeking UniversityBeijing 100871China National Biomedical Imaging Center Peking UniversityBeijing 100871China National Laboratory of Biomacromolecules CAS Center for Excellence in BiomacromoleculesInstitute of BiophysicsChinese Academy of SciencesBeijingChina Department of Automation Tsinghua UniversityBeijingChina Institute for Brain and Cognitive Sciences Tsinghua UniversityBeijingChina Beijing Key Laboratory of Multidimension&Multiscale Computational Photography Tsinghua UniversityBeijingChina Beijing Laboratory of Brain and Cognitive Intelligence Beijing Municipal Education CommissionBeijingChina School of Electrical and Electronic Engineering Yonsei University50 Yonsei-RoSeodaemun-GuSeoul 03722Korea

Structured illumination microscopy(SIM)has become the standard for next-generation wide-field microscopy,offering ultrahigh imaging speed,superresolution,a large fiield-of-view,and long-term *** the past decade,SIM hardware and software have flourished,leading to successful applications in various biological ***,unlocking the full potential of SIM system hardware requires the development of advanced reconstruction ***,we introduce the basic theory of two SIM algorithms,namely,optical sectioning SIM(OS-SIM)and superresolution SIM(SR-SIM),and summarize their implementation *** then provide a brief overview of existing OS-SIM processing algorithms and review the development of SR-SIM reconstruction algorithms,focusing primarily on 2D-SIM,3D-SIM,and *** showcase the state-of-the-art development of SIM systems and assist users in selecting a commercial SIM system for a specific application,we compare the features of representative off-the-shelf SIM ***,we provide perspectives on the potential future developments of SIM.

关键词： illumination hardware offering

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Effects of Crop Development on the Emission of Volatiles in Leaves of Lycopersicon esculentum and Its Inhibitory Activity to Botrytis cinerea and Fusarium oxysporum

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Journal of Integrative Plant Biology 2008年第1期50卷 84-91页

作者： peng-Ying Zhang Kao-Shan chen Pei-Qing He Sheng-Hao Liu Wan-Feng Jiang College of Life Sciences Shandong University Jinan 250100 China Key Laboratory of Marine Bioactive Substances First Institute of Oceanography State Oceanic Administration Qingdao 266061 China Qingdao Quafity Supervision and Inspection Center for Shopping Basket Commodity Qingdao 266003 China

Volatiles emitted from the leaves of Lycopersicon esculentum at the two-, ten-leaf and anthesis periods were collected by a gas absorbing method and analyzed by gas chromatography （GC）-mass spectrometry. In total, 33 compounds of volaUles emitted from three developmental stage plants were separated and identified, and quantitatively analyzed by the internal standard addition method. All of the samples of volatile were found to be rich in monoterpenes and sesquiterpenes.β-phellandrene and caryophyllene predominated in the volatiles of the leaves of plants at the two- and ten-leaf stages. Furthermore, （E）-2-hexenal were the dominant components in the volatiles emitted from anthesis plants. The results of volatiles analyzed show that the compositions varied depending on the developmental stages. The volatiles emitted from crushed tomato leaves of plants at the anthesis stage had the most strongly inhibitory activity against the spore germination and hyphal growth of Botrytis cinerea and Fusarium oxysporum, followed by ten- and two-leaf plants. However, the activity of volatiles, emitted from the leaves of plants at the two-leaf stage, in inhibiting F. oxysporum was greater than B. cinerea.

关键词： development inhibitroy activity Lycopersicon esculentum volatiles.

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In Situ Electrochemical Mn(Ⅲ)/Mn(Ⅳ) Generation of Mn(Ⅱ)O Electrocatalysts for High-Performance Oxygen Reduction

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Nano-Micro Letters 2020年第11期12卷 255-268页

作者： Han Tian Liming Zeng Yifan Huang Zhonghua Ma Ge Meng Lingxin peng Chang chen Xiangzhi Cui Jianlin Shi State Key Lab of High Performance Ceramics and Superfine Microstructure Shanghai Institute of CeramicsChinese Academy of SciencesShanghai 200050People’s Republic of China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049People’s Republic of China School of Chemistry and Materials Science Hangzhou Institute for Advanced StudyUniversity of Chinese Academy of SciencesHangzhou 310021People’s Republic of China College of Chemistry and Molecular Sciences Hubei Key Lab of Electrochemical Power SourcesWuhan UniversityWuhan 430072People’s Republic of China Wuhan University of Science and Technology Wuhan 430081People’s Republic of China College of Material Science and Engineering Donghua UniversityShanghai 201620People’s Republic of China

Among various earth-abundant and noble metal-free catalysts for oxygen reduction reaction(ORR),manganese-based oxides are promising candidates owing to the rich variety of manganese ***,an extremely facile method for the synthesis of cubic and orthorhombic phase coexisting Mn(Ⅱ)O electrocatalyst as an efficient ORR catalyst was *** obtained MnO electrocatalyst with oxygen vacancies shows a significantly elevated ORR catalytic activity with a half-wave potential(E1/2) of as high as 0.895 V,in comparison with that of commercial Pt/C(E1/2=0.877 V).More impressively,the MnO electrocatalyst exhibits a marked activity enhancement after test under a constant applied potential for 1000 s thanks to the in situ generation and stable presence of high-valence manganese species(Mn^3+ and Mn^4+) during the electrochemical process,initiating a synergetic catalytic effect with oxygen vacancies,which is proved to largely accelerate the adsorption and reduction of O_2 molecules favoring the ORR activity *** an excellent ORR catalytic performance of this MnO electrocatalyst is applied in Zn-air battery,which shows an extra-high peak power density of 63.2 mW cm^-2 in comparison with that(47.4 m W cm^-2) of commercial Pt/C under identical test conditions.

关键词： Zinc-air battery In situ generation High-valence manganese species Synergetic catalytic effect

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Carbon Fibers Decorated by Polyelectrolyte Complexes toward Their Epoxy Resin Composites with High Fire Safety

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Chinese Journal of Polymer Science 2018年第12期36卷 1375-1384页

作者： Xiao-hui Shi Li chen Bo-Wen Liu Jia-Wei Long Ying-Jun Xu Yu-Zhong Wang School of Chemical Engineering National Engineering Laboratory of Eco-Friendly Polymeric Materials (Sichuan) State Key Laboratory of Polymer Materials Engineering Sichuan University Chengdu 610064 China

The achievement of both robust fire-safety and mechanical properties is of vital requirement for carbon fiber （CF） composites. To this end, a facile interracial strategy for fabricating flame-retardant carbon fibers decorated by bio-based polyelectrolyte complexes （PEC） consisting of chitosan （CH） and ammonium polyphosphate （APP） was developed, and its corresponding fire-retarded epoxy resin composites （EP/（PEC@CF）） without any other additional flame retardants were prepared. The decorated CFs were characterized by SEM- EDX, XPS and XRD, indicating that the flame-retardant PEC coating was successfully constructed on the surface of CF. Thanks to the nitrogen- and phosphorous-containing PEC, the resulting composites exhibited excellent flame retardancy as the limiting oxygen index （LOI） increased from 31.0% of EP/CF to 40.5% and UL-94 V-0 rating was achieved with only 8.1 wt% PEC. EP/（PEC8.1@CF） also performed well in cone calorimetry with the decrease of peak-heat release rate （PHRR） and smoke production rate （SPR） by 50.0% and 30.4%, respectively, and the value of fire growth rate （FIGRA） was also reduced to 3.41 kW·m-2- s-1 from 4.84 kW· m-2· s-1, suggesting a considerably enhanced fire safety. Furthermore, SEM images of the burning residues revealed that the PEC coating exhibited the dominant flame-retardant activity in condensed phase via the formation of compact phosphorus-rich char. In addition, the impact strength of the composite was improved, together with no obvious deterioration of flexural properties and glass transition temperature. Taking advantage of the features, the PEC-decorated carbon fibers and the relevant composites fabricated by the cost-effective and facile strategy would bring more chances for widespread applications.

关键词： Fire safety Carbon fiber composites Epoxy resin Polyelectrolyte complexes

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Enzymological characterization of Flla,a fibrinolytic enzyme from Agkistrodon acutus venom

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Acta Pharmacologica Sinica 2005年第12期26卷 1474-1478页

作者： Xiu-xia LIANG Ying-na ZHOU Jia-shu chen~2 peng-xin QIU hui-zhen chen Huan-huan SUN Yu-ping WU Guang-mei YAN Department of Pharmacology,Zhongshan Medical College,Sun Yat-Sen University,Guangzhou 510080,China Department of Pharmacology Zhongshan Medical College Sun Yat-Sen University Guangzhou China

Aim:To study the enzymological characterization of a fibrinolytic enzyme(FⅡa)from Agkistrodon acutus ***:The fibrinogenolytic effect and theinfluences of several protease inhibitors,chelating agents,and metal ions onfibrinogenolytic activity were visualized by sodium dodecyl sulfate-polyacryla-mide gel *** metal content of FⅡawas determined by atomicabsorption ***:After incubation with FⅡa(0.25 g/L),Aα-,Bβ-and γ-chains of fibrinogen disappeared within 5 min,30 min,and 8 h,*** molecular weights of major degradation products were 45 000 and 41 000,which were different from those bands produced by *** fibrinogenolyticactivity of FⅡawas strongly inhibited by ethylenediamine tetraacetic acid(EDTA),ethyleneglycol tetraacetic acid(EGTA),dithiothreitol and cysteine,but not byphenyhnethyl-sulfonyl fluoride and soybean trypsin ***(3171±25rag&g),potassium(489±17 mg/kg)and calcium(319±13 mg/kg)were found in FⅡ***2+,Ca2+and Mg2+could recover the fibrinogenolytic activity of FⅡa,which wasinhibited by *** Ca2+ could recover the fibrinogenolytic activity inhibitedby ***:FⅡacan degrade the Aα-,Bβ-and γ-chains of fibrinogen.FⅡais a metalloproteinase,and Zn2+,Ca2+,and disulfide bonds are necessary forits fibrinogenolytic activity.

关键词： snake venoms Agkistrodon acutus fibrinolysis metalloproteinase

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Effect of CO_(2) Curing on the Physical Properties of Recycled Coarse Aggregate with Different Attached Mortar Contents

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Journal of Wuhan University of Technology(Materials Science) 2022年第5期37卷 905-911页

作者： ZHU Pinghua LI Haichao LIU hui YAN Xiancui WANG Xinjie chen Chunhong Department of Civil Engineering Changzhou UniversityChangzhou213164China

The effects of carbon dioxide (CO_(2)) curing conditions (temperature,relative humidity and CO_(2) curing time) on the physical properties of recycled coarse aggregate (RCA) with varying attached mortar (AM) contents were *** and after CO_(2) curing,the physical properties in terms of the apparent density,water absorption and crushing value of RCA were tested and the quality of RCA was ***,scanning electron microscope was used to observe the microstructure of *** show that the physical properties variation of RCA with higher AM content are more significant,and the quality of RCA with lower AM content is easier to be upgraded during CO_(2) *** physical properties of RCA with 40.8% AM content are earlier stable than that with no less than 44.5% AM content during CO_(2) *** optimal temperature and relative humidity are 50 ℃ and 55% for CO_(2) curing,***_(2) curing is incapable of upgrading the quality of RCA with AM no less than 50.6%.The quality of RCA with 44.5% AM content can be upgraded only under the optimum CO_(2) curing *** relative humidity higher than 40% and the CO_(2) curing time more than 12 h,CO_(2) curing upgrades the quality of RCA with 40.8% AM content.

关键词： recycled coarse aggregate attached mortar content carbon dioxide curing curing time relative humidity temperature

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Mechanoluminescent Materials Enable Mechanochemically Controlled Atom Transfer Radical Polymerization and Polymer Mechanotransduction

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Research 2024年第3期2023卷 97-104页

作者： Zexuan Li Zhenhua Wang chen Wang Wenxi Li Wenru Fan Ruoqing Zhao Haoyang Feng Dengfeng peng Wei Huang Frontiers Science Center for Flexible Electronics Institute of Flexible ElectronicsNorthwestern Polytechnical UniversityXi’an 710072China. School of Materials Science and Engineering Northwestern Polytechnical UniversityXi’an 710072China Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province College of Physics and Optoelectronic EngineeringShenzhen UniversityShenzhen 518060China.

Organic mechanophores have been widely adopted for polymer ***,most examples of polymer mechanotransduction inevitably experience macromolecular chain rupture,and few of them mimic mussel’s mechanochemical regeneration,a mechanically mediated process from functional units to functional materials in a controlled *** this paper,inorganic mechanoluminescent(ML)materials composed of CaZnOS-ZnS-SrZnOS:Mn2+were used as a mechanotransducer since it features both piezoelectricity and *** utilization of ML materials in polymerization enables both mechanochemically controlled radical polymerization and the synthesis of ML polymer *** procedure features a mechanochemically controlled manner for the design and synthesis of diverse mechanoresponsive polymer composites.

关键词： chemically polymerization luminescent

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Micro-flower-like MoS_(2)-modified Co_(9)S_(8)heterostructure as anode material for sodium-ion batteries with superior reversibility and rate capacity

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Journal of Materials Science & Technology 2023年第14期145卷 210-220页

作者： Yang He Changlin Liu Shang peng Juan Zhang Gang chen Zhongbao Feng Qiang Zhao Abuliti Abudula Guoqing Guan Graduate School of Science and Technology Hirosaki University1-BunkyochoHirosaki 036-8560Japan Energy Conversion Engineering Laboratory Institute of Regional Innovation(IRI)Hirosaki University3-BunkyochoHirosaki 036-8561Japan School of Metallurgy Liaoning Key Laboratory for Metallurgical Sensor and TechnologyNortheastern UniversityShenyang 110819China School of Chemistry and Environmental Engineering Shanxi Datong UniversityDatong 037009China

Designing and fabricating of heterostructured materials with long-term cycling stability and high-rate capacity for the anode of sodium-ion batteries(SIBs)still remain a great ***,micro-flower-like MoS_(2)-modified Co_(9)S_(8)(Co_(9)S_(8)/MoS_(2))with a three-dimensional(3D)heterostructure was first obtained via a simple solvothermal synthesis followed by a solid sulfidation treatment *** a material for the anode of SIBs,the Co_(9)S_(8)/MoS_(2)-based electrode with an initial Co/Mo molar ratio of 1/1(denoted as CM55-S)exhibits the best sodium storage performance with a boosted capacity,superior reversibility(424.5 mAh g^(-1)@2 A g^(-1)at the 1600th cycle,401.1 mAh g^(-1)@5 A g^(-1)at the 800th cycle),and an excellent rate capacity(210.1 mAh g^(-1)@20 A g^(-1)).Density functional theory(DFT)calculations confirm that the Co_(9)S_(8)/MoS_(2)heterostructure has a lower energy barrier(0.30 eV)than the pure Co_(9)S_(8)(0.53 eV).It is expected that such a heterostructured material could be an attractive candidate as the material of the anode for SIBs.

关键词： Sodium-ion batteries,Anode materials Co_(9)S_(8) MoS_(2),Heterostructure,Reversibility,Rate capacity

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