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Wang Bo and Feng Xiao team Make New Progress in Field of Organic Porous Skeleton

release date :2019-03-16 01:16:00  |   [ close window ]ViewCount:

    Translator: News Agency of BIT, Zhuang Chunyu

    Editor: News Agency of BIT

   

  Organic porous materials, including covalent organic framework materials (COFs), conjugated microporous polymers (CMPs), porous aromatic framework materials (PAFs), etc., are a new class of porous polymers with high specific surface area and abundant pore environment. Such materials have shown excellent application prospects in the fields of gas adsorption and storage, and catalysis. Professor Wang Bo and special researcher Feng Xiao had carried out a series of research and recently obtained the following research results.

 

  Environmental problems such as water pollution are a major challenge in today's society. Advanced oxidative degradation of pollutants through photocatalytic reactions is expected to become a more efficient and energy saving treatment for pollutants. Wang Bo and Feng Xiao team constructed a series of ferrocene-based conjugated microporous polymers (Fc-CMPs) for the degradation of toxic and harmful substances through triple bond polymerization. Fc-CMPs have a large pore size and specific surface area, so that contaminants can easily enter the pores for pre-concentration and can be sufficiently close to the inner surface susceptible to redox reactions, while the appropriate molecular orbital energy levels of Fc-CMPs make such materials available.

 

  Under visible light and simulated sunlight, the ability of Fc-CMPs to photocatalytic degrade methylthioninium chloride was superior to that of titanium dioxide (P25), and 2-chloroethylethyl sulfide can be completely converted into non-toxic product. The research work was published in Angewandte Chemie (Angew. Chem. Int. Ed., 2019, DOI: 10.1002/anie.201813598). The first author is Dr. Ma Li, and the corresponding authors are Wang Bo and Feng Xiao.

  In the preliminary work (Angew. Chem. Int. Ed., 2017, 56, 16313, the first author: Dr. Zhang Yuanyuan, the corresponding author: Feng Xiao), the team has successfully developed a three-dimensional covalent organic based on cyclodextrin. Skeleton materials (CD-COFs), which were the first three-dimensional COFs materials constructed with flexible primitives and having rra topology and connected by ionic boron elements. Among them, the room temperature lithium ion conductivity of CD-COF-LiÉLiPF6-EC-DMC could reach 2.7 mS cm-1. However, the residual trace amount of electrolyte may bring certain safety hazards in the actual application process. To solve this problem, the team loaded low molecular Xiaoght polyethylene glycol (PEG) into the COF channel to accelerate lithium ion conduction, prepared an all-solid electrolyte without solvent residue, and systematically studied the COF skeleton charge for lithium ions. The effect of conduction behavior was to achieve a lithium ion migration number greater than 0.6 and an ion conduction rate of 1.8 mS cm−1 at 120 °C. This simple strategy of accelerating ion conduction by loading PEG and increasing the operating temperature range provided the possibility to further apply porous materials to the field of all solid state batteries. The research was published in the Journal of the American Chemical Society and was selected as the cover article (J. Am. Chem. Soc., 2019, 141, 1923). The first authors of the article were master student Guo Zhenbin and doctoral student Zhang Yuanyuan. Corresponding authors were Wang Bo and Feng Xiao.

  

       Most of the organic porous materials are insoluble and infusible, which brings great challenges to practical applications such as further deviceization. Based on the previous large-scale film formation research, the team successfully developed a series of COF thin film materials with different lengths of alkoxy chain modification by liquid-liquid interface film formation method, and studied the dielectric constant and other related properties. This series of flexible COF membranes have a dielectric constant close to that of air (κ = 1.19 ± 0.04 at 105 Hz), comparable to the currently reported inorganic porous materials, and such COF film materials exhibit better mechanical properties performance, low dielectric loss, high breakdown voltage, low leakage current, high humidity resistance and resistance to bending. Low dielectric constant materials are widely used in insulating layers in electronic circuit devices to reduce signal delay, crosstalk noise, and energy dissipation. In addition, high dielectric constant materials can be applied to the gate and capacitor of field effect transistors. The team also used COF films to load small molecular polar compounds, which can increase the dielectric constant by 43 times. The research work was published in Angewandte Chemie (Angew. Chem. Int. Ed., 2018, 57, 16501). The first authors of the article were Dr. Shao Pengpeng and Li Xiao, and the corresponding authors were Wang Bo and Feng Xiao.

Links of the related papers being mentioned:
https://onlinelibrary.wiley.com/doi/10.1002/anie.201813598https://pubs.acs.org.ccindex.cn/doi/10.1021/jacs.8b13551https://onlinelibrary.wiley.com/doi/full/10.1002/anie.201710633https://onlinelibrary.wiley.com/doi/full/10.1002/anie.201811250

 

Attached to the team members:
       Wang Bo, distinguished professor, executive dean of the Advanced Research Institute of Multidisciplinary Science. He also is the winner of the National Distinguished Young Investigator Fund, the leading talent for young and middle-aged science and technology innovation in the Ministry of Science and Technology and received the "Chinese Chemical Society Youth Chemistry Award". He is currently the executive director of the International IZA Society MOF Commission, the executive director of the China Society for Transport's Environment and Sustainable Development, and the editorial board of the China Chemical Express and the Chinese Journal of Chemistry. His research direction mainly involves inorganic organic porous framework materials and film formation research, and carries out a series of research work in the fields of atmospheric treatment, pollutant filtration and degradation, and energy storage. He has published more than 60 papers in academic journals such as Nature, Science, JACS, and Angewandte Chemie. His SCI papers were cited more than 7,000 times. Large-scale mass production and industrial applications of technologies such as air filtration membranes have been achieved by cooperating with related companies.

 

  Feng Xiao, special researcher of School of Chemistry and Chemical Engineering. His main research direction is the structure-activity relationship of crystalline porous materials such as covalent organic framework materials. He has published 28 articles including 5 in J.Am.Chem.Soc, 5 in Angew.Chem.Int.Ed, 2 in Adv.Mater, as the first or corresponding author, which have been cited more than 3,200 times. His research results have been approved and paid attention by scholars at home and abroad, and have been reported by international professional journals several times.

   

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