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Rationally tuning host–guest interactions to free hydroxide ions within intertrimerically cuprophilic metal–organic frameworks for high OH conductivity

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Abstract

Hydroxide-anion-exchange membrane fuel cells (HEMFCs) are now considered as one of the most promising green energy-conversion technologies for stationary and mobile applications, showing high fuel conversion efficiency at high pH and low cost due to their ability to operate under basic conditions using non-precious metal catalysts. But one key impediment to commercialization is insufficient hydroxide ion (OH) conductivity of the central HEM component. Here, we report the development of free OH anion-containing metal–organic frameworks (FOMOFs) with rationally tunable host–guest interactions for HEMs with high OH conductivity. Among three solids obtained by post-synthesis treatment of ultrastable MOF FJU-66 with various bases, free OH anions are observed in FJU-66·[EVIm]OH with strong host–guest interactions between the MOF backbone and guest cations. Despite the lowest OH concentration, FJU-66·[EVIm]OH exhibits the highest OH conductivity close to 0.1 S cm−1. The high OH conductivity achieved suggests the potential application of the FOMOFs for practical HEMs of fuel cells.

Graphical abstract: Rationally tuning host–guest interactions to free hydroxide ions within intertrimerically cuprophilic metal–organic frameworks for high OH− conductivity

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Publication details

The article was received on 31 Dec 2016, accepted on 27 Feb 2017, published on 28 Feb 2017 and first published online on 28 Feb 2017


Article type: Paper
DOI: 10.1039/C6TA11242K
Citation: J. Mater. Chem. A, 2017, Advance Article
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    Rationally tuning host–guest interactions to free hydroxide ions within intertrimerically cuprophilic metal–organic frameworks for high OH conductivity

    Z. Li, Z. Zhang, Y. Ye, K. Cai, F. Du, H. Zeng, J. Tao, Q. Lin, Y. Zheng and S. Xiang, J. Mater. Chem. A, 2017, Advance Article , DOI: 10.1039/C6TA11242K

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