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Issue 9, 2017
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An anchoring strategy leads to enhanced proton conductivity in a new metal–organic framework

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Abstract

A new Zr(IV)-based metal–organic framework, termed VNU-17 [Zr6O8(H2O)8(HSNDC)4, where HSNDC2− = 4-sulfonaphthalene-2,6-dicarboxylate], was designed to enhance proton conductivity through the incorporation of Brønsted acid functionalities. The resulting VNU-17 framework adopted the bcu topology and the structure was highlighted by densely packed sulfonic acid groups lining 6 Å channels. Following this, the internal void space of VNU-17 was engineered to further enhance proton conductivity, in which the proton transfer agent, imidazole (HIm), was anchored within the structure in two different loadings. Remarkably, the material with the highest HIm load, HIm11⊂VNU-17, exhibited a 900-fold enhancement in proton conductivity (5.9 × 10−3 S cm−1 at 85% RH and 70 °C) in comparison with the parent VNU-17 structure and was shown to maintain its performance over at least 40 h. These findings demonstrate the potential for systematically fine-tuning such materials for use as electrolyte materials in proton exchange membrane fuel cells.

Graphical abstract: An anchoring strategy leads to enhanced proton conductivity in a new metal–organic framework

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Publication details

The article was received on 19 Jun 2017, accepted on 15 Jul 2017 and first published on 17 Jul 2017


Article type: Research Article
DOI: 10.1039/C7QI00350A
Citation: Inorg. Chem. Front., 2017,4, 1509-1516
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    An anchoring strategy leads to enhanced proton conductivity in a new metal–organic framework

    T. H. N. Lo, M. V. Nguyen and T. N. Tu, Inorg. Chem. Front., 2017, 4, 1509
    DOI: 10.1039/C7QI00350A

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