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Covalent triazine frameworks materials for photo-and electrocatalysis

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Nano Research 2024年第9期17卷 7830-7839页

作者： Aoji Liang Wenbin Li Anbai Li Hui Peng Guofu Ma Lei Zhu Ziqiang Lei yuxi xu Key Laboratory of Eco-functional Polymer Materials of the Ministry of Education Key Laboratory of Polymer Materials of Gansu ProvinceCollege of Chemistry and Chemical EngineeringNorthwest Normal UniversityLanzhou 730070China School of Chemistry and Materials Science Hubei Key Laboratory of Quality Control of Characteristic Fruits and VegetablesHubei Engineering UniversityXiaogan 432000China School of Engineering Westlake UniversityHangzhou 310024China

Covalent triazine frameworks(CTFs)are a class of unique two-dimensional nitrogen-rich triazine framework with adjustable chemical and electronic structures,rich porosity,good stability and excellent semiconductivity,which enable great various applications in efficient gas/molecular adsorption and separation,energy storage and conversion,especially photo-and *** synthesis strategies strongly affect the morphology of CTFs and play an important role in their structure and *** this concept,we provide a comprehensive and systematic review of the synthesis methods such as ionothermal synthesis,phosphorus pentoxide catalytic method,polycondensation and ultra-strong acid catalyzed method,and applications of CTFs in photo-and *** we offer some insights into the future development progress of CTFs materials for catalytic applications.

关键词： covalent triazine frameworks synthetic strategy photocatalysis electrocatalysis

Direct Synthesis of Ultrathin Crystalline Two-Dimensional Triazine Polymers from Aldoximes

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CCS Chemistry 2024年第4期6卷 932-940页

作者： Jianghong Zhen Jichuang Shen Tian Sun Congxu Wang Pengbo Lyu yuxi xu School of Engineering Westlake UniversityHangzhou 310024Zhejiang School of Materials Science and Engineering Xiangtan UniversityXiangtan 411105Hunan

The efficient synthesis of ultrathin crystalline twodimensional(2D)polymers with well-defined repeating units is essential to realize their broad applications but remains a great ***,we report a new strategy to directly synthesize a series of few-layer 2D triazine-based polymers(2DTPs)via trimerization reaction of aromatic aldoximes in one step with a high yield of 85%using AlCl3 as catalyst under solvent-free *** obtained 2D-TPs show high crystallinity,a lateral size of several micrometers,an ultrathin thickness less than 2 nm,and good dispersibility and *** semi-in situ and detailed control experiments,we reveal that the 2D polymerization reaction is a two-step process of dehydration and then cyclotrimerization,and AlCl3 acts as not only catalyst but also an in situ generated template for promoting the formation of *** explored as a new polymeric anode for potassium-ion batteries,the 2D-TP displayed an extraordinary reversible specific capacity of 356 mAh g^(−1)at 0.05 A g^(−1),which is among the best performances ever reported,outstanding rate capability(153 mAh g^(−1)at 1 A g^(−1)),and excellent cycling stability with 95.1%capacity retention after 1000 cycles at 1 A g^(−1).

关键词： two-dimensional triazine polymer aldoxime monomers catalytic cyclotrimerization template-assisted synthesis potassium-ion battery

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高速铁路箱梁裂缝原因分析及整治措施

中国高新科技 2024年第14期 115-117页

作者：徐玉玺中国铁路广州局集团有限公司惠州工务段广东惠州516023

高速铁路箱梁裂缝,对梁体结构质量存在较大隐患。通过认真分析研究箱梁裂缝的原因,提出对不同深度、宽度的裂缝,采用相应的方法进行整治。在完成新建广州至汕尾铁路箱梁裂缝病害整治后,检查混凝土实体质量能够满足箱梁结构和功能要求,... 详细信息

高速铁路箱梁裂缝,对梁体结构质量存在较大隐患。通过认真分析研究箱梁裂缝的原因,提出对不同深度、宽度的裂缝,采用相应的方法进行整治。在完成新建广州至汕尾铁路箱梁裂缝病害整治后,检查混凝土实体质量能够满足箱梁结构和功能要求,提升桥梁结构的耐久性和安全性。本研究提出的整治方案可为高速铁路箱梁裂缝整治提供参考。

关键词：高速铁路箱梁裂缝成因分析整治措施

Highly crystalline vinylene-linked covalent organic frameworks enhanced solid polycarbonate electrolyte for dendrite-free solid lithium metal batteries

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Nano Research 2022年第9期15卷 8083-8090页

作者： Kaige Zhang Chaoqun Niu Chengbing Yu Li Zhang yuxi xu School of Materials and Engineering Zhengzhou UniversityZhengzhou 450001China School of Engineering Westlake UniversityHangzhou 310024China School of Materials Science and Engineering Shanghai UniversityShanghai 201800China

The development of solid-state electrolytes(SSEs)with high ionic conductivity,outstanding electrochemical window,and promising mechanical strength is a key factor in realizing the commercialization of high energy density solid-state lithium metal batteries(LMBs).Covalent organic frameworks(COFs)are a functional crystalline material with highly customizable molecular networks and one-dimensional channel structures,thus showing great potential applications in ***,we design flexible COF-poly(vinyl ethylene carbonate)(PVEC)(abbreviated as COF-PVEC)composite electrolyte films with excellent ionic conductivity and high mechanical strength,enabling dendrite-free and long-term running solid-state *** to the lithiumphilic triazine and carbon–carbon double bonds groups in the COF skeleton,the obtained flexible COF-PVEC shows high ionic conductivity up to 1.11×10^(−4)S·cm^(−1)at 40℃,and enlarged electrochemical window up to 4.6 V(***^(+)/Li)compared with pure PVEC *** the same time,the lithium dendrites are efficiently inhibited after discharge–charging cycles,due to the improved Young’s modulus(150 MPa)and ordered channels of *** the various features of COF-PVEC,we assembled a solid-state full battery with LiFePO4 cathode,which showed superior rate capacity(151.8,146.2,139.2,128.1,113.7,and 100.8 mAh·g^(−1)at 0.1,0.2,0.5,1,1.5,and 2 C,respectively)and excellent long-term cycling stability(over 400 cycles at 1 C).We believe that the COF-based composite electrolyte can become one of the most promising high-performance SSEs for solid-state LMBs.

关键词： solid-state electrolytes covalent organic frameworks lithium dendrites solid-state lithium metal batteries

Recent progress in COF-based electrode materials for rechargeable metal-ion batteries

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Nano Research 2023年第5期16卷 6753-6770页

作者： Shunhang Wei Jiwei Wang Yuzhao Li Zebo Fang Lei Wang yuxi xu Zhejiang Engineering Research Center of MEMS Shaoxing UniversityShaoxing 312000China School of Engineering Westlake UniversityHangzhou 310024China School of Mechatronics Engineering and Automation Foshan UniversityFoshan 528225China Department of Chemistry Binghamton UniversityBinghamtonNew York 13902USA China Electronics Corporation Beijing 100086China

Covalent organic frameworks(COFs)have emerged as promising electrode materials for rechargeable metal-ion batteries and have gained much attention in recent years due to their high specific surface area,inherent porosity,tunable molecular structure,robust framework,abundant active ***,compared with inorganic materials and small organic molecules,COFs have the advantages of multi-electron transfer,short pathways,high cycling *** great progress on COF-based electrodes has been made,the corresponding electrochemical performance is still far from satisfactory for practical *** this review,we first summarize the fundamental background of COFs,including the species of COFs(different active covalent bonds)and typical synthesis methods of ***,the key challenges and the latest research progress of COF-based cathodes and anodes for metal-ion batteries are reviewed,including Li-ion batteries,Na-ion batteries,K-ion batteries,Zn-ion batteries,et ***,the effective strategies to enhance electrochemical performance of COF-based electrodes are ***,this review also covers the typical superiorities of COFs used in energy devices,as well as providing some perspectives and outlooks in this *** hope this review can provide fundamental guidance for the development of COFbased electrodes for metal-ion batteries in the further research.

关键词： covalent organic frameworks metal-ion batteries electrochemical performance synthetic methods structure–property relationship

植物鞘氨醇诱导白血病细胞凋亡的作用及机制研究

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陆军军医大学学报 2024年第4期46卷 359-368页

作者：杨官翠刘金宜蒋佩洁许玉溪田小龙王筱淇王瑞杨世杰宋清晓魏锦张曦川北医学院附属医院血液内科南充637002 陆军军医大学(第三军医大学)第二附属医院血液病医学中心全军临床重点专科创伤与化学中毒全国重点实验室重庆市临床重点专科血液病与微环境重庆市重点实验室重庆400037 金凤实验室重庆401329

目的初步探讨植物鞘氨醇(phytosphingosine, PHS)对白血病细胞凋亡的影响及其可能机制。方法采用人白血病细胞株K562及SUP-B15作为研究模型,CCK-8法检测细胞活力,EdU检测细胞DNA合成能力,RNA-seq检测PHS处理后差异表达基因,GO功能富集... 详细信息

目的初步探讨植物鞘氨醇(phytosphingosine, PHS)对白血病细胞凋亡的影响及其可能机制。方法采用人白血病细胞株K562及SUP-B15作为研究模型,CCK-8法检测细胞活力,EdU检测细胞DNA合成能力,RNA-seq检测PHS处理后差异表达基因,GO功能富集及KEGG信号通路富集分析PHS可能作用的分子途径,CTD数据库和Discovery Studio软件对PHS进行反向找靶,Discovery Studio软件对PHS和BCL-2进行分子对接,流式细胞术检测细胞凋亡变化,JC-1染色检测线粒体膜电位变化,Western blot检测凋亡相关分子蛋白水平表达变化。结果 PHS能抑制K562和SUP-B15细胞增殖,且呈剂量和时间依赖性。PHS的半数抑制浓度在K562细胞中分别为17.67μmol/L(24 h)和12.52μmol/L(48 h),在SUP-B15细胞中分别为17.58μmol/L(24 h)和14.86μmol/L(48 h)。20μmol/L PHS作用白血病细胞48 h后,能显著抑制细胞DNA的合成(P<0.05)。对PHS作用于K562细胞后差异基因进行GO富集分析发现PHS可能参与细胞凋亡正向调控、细胞质膜及组分、激酶结合与活性等生物功能。反向找靶结果提示,BCL-2作为PHS作用靶点的可能性最高。PHS作用白血病细胞48 h后细胞凋亡率显著增加(P<0.05),呈剂量依赖性;线粒体膜电位下降,抗凋亡蛋白BCL-2表达下调(P<0.05),Cleaved caspase-3及Cleaved caspase-9蛋白表达上调(P<0.05)。结论 PHS诱导白血病细胞发生线粒体依赖性细胞凋亡,抑制白血病细胞增殖,并可能与PHS/BCL-2结合体有关。

关键词：植物鞘氨醇白血病细胞凋亡转录组分析

Tailoring the interaction of covalent organic framework with the polyether matrix toward high-performance solid-state lithium metal batteries

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Carbon Energy 2022年第4期4卷 506-516页

作者： Zhen Hou Shuixin Xia Chaoqun Niu Yuepeng Pang Hao Sun Zhiqi Li yuxi xu Shiyou Zheng School of Materials and Chemistry University of Shanghai for Science and TechnologyShanghaiChina School of Engineering Westlake UniversityHangzhouChina

Solid polymer electrolyte is one of the most promising avenues to construct next-generation energy storage systems with high energy density,high safety,and flexibility,yet the low ionic conductivity at room temperature and poor high-voltage tolerance have limited their practical *** address the above issues,we design and synthesize a highly crystalline,vinyl-functionalized covalent organic framework(V-COF)rationally grafted with ether-based segments through solvent-free in situ polymerization.V-COF can afford a fast Li+conduction highway along the one-dimensional nanochannels and improve the high-voltage stability of ether-based electrolytes due to the rigid and electrochemically stable *** as-formed solid-state electrolyte membranes demonstrate a superior ionic conductivity of 1.1×10^(−4)S cm^(−1)at 40℃,enhanced wide electrochemical window up to 5.0 V,and high Young's modulus of 92 *** Li symmetric cell demonstrates ultralong stable cycling over 600 h at a current density of 0.1 mA cm^(−2)(40℃).The assembled solid-state Li|LiFePO4 cells show a superior initial specific capacity of 136 mAh g^(−1)at 1 C(1 C=170 mA g^(−1))and a high capacity retention rate of 84%after 300 *** study provides a novel and scalable approach toward high-performance solid ether-based lithium metal batteries.

关键词： covalent organic framework energy storage in situ polymerization solid polymer electrolyte

Covalent Triazine Framework Nanosheets for Efficient Energy Storage and Conversion

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Chemical Research in Chinese Universities 2020年第4期36卷 640-647页

作者： SUN Tian WANG Congxu xu yuxi School of Engineering Wesllake UniversityHangzhou 310024P.R.China

Two-dimensional crystalline covalent triazine frameworks(CTFs)have received much attention because oftheir unique triazine structure,which endows CIFs with high thernal and chemical stability,high proportion of nitrogen and permanent *** on this unique structure *** have shown great potential in energy storage and conversion due to the intrinsically strong conjugated *** electron and rich active *** carrier(electron,hole or ion)transport can't reach the deep active sites and charge diffusion was impeded by defects in bulk ***,to break through this barrier,increasing attention has been paid to get few lavered CTFs or CTFs nanosheets in order to shorten the pathways of charge diffiusion and expose more active *** review summarizes the synthetic methodologies of CTFs nanosheets and the potential application in photocatalvtic and electrochemical energy storage and conversion.

关键词： Bulk crystalline covalent triazine framework(CIF) CTFs nanosheet Synthesis Photocatalysis Electrochemical energy storage

Two-dimensional polymer nanosheets for efficient energy storage and conversion

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Nano Research 2021年第6期14卷 2023-2036页

作者： Yumei Ren Chengbing Yu Zhonghui Chen yuxi xu School of Materials Science and Engineering Shanghai UniversityShanghai201800China School of Materials Science and Engineering Zhengzhou University of AeronauticsZhengzhou450046China School of Engineering Westlake UniversityHangzhou310024China Key Lab for Special Functional Materials of Ministry of Education School of Materials Science and EngineeringHenan UniversityKaifeng475004China

As a promising graphene analogue,two-dimensional(2D)polymer nanosheets with unique 2D features,diversified topological structures and as well as tunable electronic properties,have received extensive attention in recent *** in this review,we summarized the recent research progress in the preparation methods of 2D polymer nanosheets,mainly including interfacial polymerization and solution *** also discussed the recent research advancements of 2D polymer nanosheets in the fields of energy storage and conversion applications,such as batteries,supercapacitors,electrocatalysis and ***,on the basis of their current development,we put forward the existing challenges and some personal perspectives.

关键词： two-dimensional(2D)polymer nanosheets 2D polymerization batteries supercapacitors photo(electro)catalysis