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Issue 3, 2013
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From metal–organic framework (MOF) to MOF–polymer composite membrane: enhancement of low-humidity proton conductivity

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Abstract

A chiral two-dimensional MOF, {[Ca(D-Hpmpc)(H2O)2]·2HO0.5}n (1, D-H3pmpc = D-1-(phosphonomethyl) piperidine-3-carboxylic acid), with intrinsic proton conductivity has been synthesized and characterized. Structure analysis shows that compound 1 possesses protonated tertiary amines as proton carriers and hydrogen-bonding chains served as proton-conducting pathways. Further, MOF–polymer composite membranes have been fabricated via assembling polymer PVP with different contents of rod-like 1 submicrometer crystals. Interestingly, the proton conductivity of this composite membrane containing 50 wt% 1 is rapidly increased, compared with that of pure submicrometer crystals at 298 K and ∼53% RH. Therefore, it is feasible to introduce humidification of PVP into composite membranes to enhance low-humidity proton conductivity; and humidified PVP with adsorbed water molecules plays an important role in proton conduction indicated by the results of water physical sorption and TG/DTG analyses. This study may offer a facile strategy to prepare a variety of solid electrolyte materials with distinctive proton-conducting properties under a low humidity.

Graphical abstract: From metal–organic framework (MOF) to MOF–polymer composite membrane: enhancement of low-humidity proton conductivity

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Publication details

The article was received on 08 Sep 2012, accepted on 22 Nov 2012 and first published on 23 Nov 2012


Article type: Edge Article
DOI: 10.1039/C2SC21927A
Chem. Sci., 2013,4, 983-992

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    From metal–organic framework (MOF) to MOF–polymer composite membrane: enhancement of low-humidity proton conductivity

    X. Liang, F. Zhang, W. Feng, X. Zou, C. Zhao, H. Na, C. Liu, F. Sun and G. Zhu, Chem. Sci., 2013, 4, 983
    DOI: 10.1039/C2SC21927A

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