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Research Article

Free-standing polymer-metal-organic framework membrane with high proton conductivity and water stability

Hexiang Gao1, Zhanpeng Gao1, Chao Ye2, Guoli Zhou1(), Zhiwei Yang1, Kun Dai3, Wenjia Wu1 (), Jingtao Wang1
School of Chemical Engineering, Zhengzhou University, Zhengzhou 450001, China
School of Chemical Engineering & Advanced Materials, The University of Adelaide, Adelaide 5005, Australia
School of Materials Science and Engineering, Key Laboratory of Materials Processing and Mold, Ministry of Education, Zhengzhou University, Zhengzhou 450001, China
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The pre-organization of polymer and metal ions allows the anisotropic growth to prepare polyMOF nanosheet. This unique structure permits continuous transfer pathway in vertical direction, affording superior structural stability against water and rapid proton transfer for polyMOF membrane.

Abstract

As a new class of porous material, polymer-metal-organic framework (polyMOF) has attracted tremendous interests owing to their combined advantages of polymer and crystalline MOF. However, the poor film-forming ability of polyMOF limits its widespread application, especially in membrane separation area. Herein, for the first time, we demonstrate the fabrication of free-standing polyMOF membrane. The polyMOF nanosheets are synthesized by a polymer-assisted self-inhibition crystal growth strategy. Followed by self-assembly through vacuum filtration, a 20 μm-thick free-standing polyMOF membrane is constructed. Benefiting from the inclusion of polymer with hydrophobic backbone and the continuously distributed non-coordinated hydrophilic groups along polymer chain, the polyMOF membrane attains excellent structure stability against water, as well as superior proton transfer property. Proton conductivity as high as 112 and 25.6 mS·cm–1 is obtained by this polyMOF membrane at 100% and 20% relative humidity (RH), respectively, which are two orders of magnitude higher than those of pristine MOF. The conductivity under low humidity (20% RH) is even over 8 times higher than that of commercial Nafion membrane (3 mS·cm–1). This study may provide some guidance on the development of polyMOF membranes.

Keywords

polymer-metal-organic framework membranenanosheetself-inhibitioncontinuous transfer pathwayproton conduction

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Nano Research
Volume 16 Issue 5,
May 2023
Pages 7950-7957
DOI: 10.1007/s12274-022-5276-4
Cite this article:
Gao H, Gao Z, Ye C, et al. Free-standing polymer-metal-organic framework membrane with high proton conductivity and water stability. Nano Research, 2023, 16(5): 7950-7957. https://doi.org/10.1007/s12274-022-5276-4
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