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Nafion-threaded mof laminar membrane with efficient and stable transfer channels towards highly enhanced proton conduction

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Nano Research 2022年第4期15卷 3195-3203页

作者： Yan Wang Hexiang Gao Wenjia Wu Zhuofan Zhou Zhiwei Yang Jingtao Wang Yecheng Zou School of Chemical Engineering Zhengzhou UniversityZhengzhou 450001China Henan Institute of Advanced Technology Zhengzhou UniversityZhengzhou 450003China Engineering Research Center of Advanced Functional Material Manufacturing of Ministry of Education School of Chemical EngineeringZhengzhou UniversityZhengzhou 450001China State Key Laboratory of Fluorinated Functional Membrane Materials Shandong DongYue Polymer Material Co.LtdZibo 256400China

Porous laminar membranes hold great promise to realize ultrafast ion transfer if efficient and stable transfer channels are constructed in vertical ***,metal-organic framework(mof)nanosheets bearing imidazole molecules in the pores were designed as building blocks to assemble free-standing mof laminar ***,Nafion chains were threaded into the pores induced by electrostatic attraction from imidazole molecules by slowly filtering dilute Nafion *** demonstrate that the threaded Nafion chains lock adjacent mof nanosheets,affording highly enhanced structural stability to the resultant laminar membrane with almost no water ***,abundant acid-base pairs are formed in the pores along Nafion chains,working as efficient,continuous conduction pathways in vertical *** conductivities as high as 110 and 46 mS·cm^(-1)are obtained by this membrane under 100%and 40%relative humidity(RH),respectively,which are two orders of magnitude higher than that of pristine mof *** conductivity under low humidity(40%RH)is even over 2 times higher than that of commercial Nafion membrane,generating the maximum power density of 1,100 mW·cm^(-2)in hydrogen fuel cell(vs.291 mW·cm^(-2)of Nafion membrane).Besides,the influence of water state on proton transfer in confined space is investigated in detail.

关键词： mof nanosheet Nafion-threaded mof laminar membrane structural stability proton conductivity hydrogen fuel cell

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