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Issue 5, 2018
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Inorganic open framework based on lanthanide ions and polyoxometalates with high proton conductivity

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Abstract

The development of new proton-conducting materials that are cost effective and have high proton conductivity and water stability is very important in fuel cell technology. Lanthanide-based metal–organic frameworks (MOFs) exhibit proton conduction properties but usually display the problem of poor hydrophilicity. We propose that the organic ligands can be replaced with polyoxometalates, and the as-prepared lanthanide-based inorganic porous materials with lanthanide ions may possess improved hydrophilicity and proton conductivity. Herein, we re-synthesize two inorganic open frameworks based on [MnV13O38]7− clusters and lanthanide ions (H[Ln(H2O)4]2[MnV13O38]·9NMP·17H2O (Ln = Ce (1), and La (2); NMP = N-methyl-2-pyrrolidone)) and explore their potential proton conductivities. Under the same test conditions, both compounds show only a little difference in proton conductivities with the values of 4.68 × 10−3 S cm−1 and 3.46 × 10−3 S cm−1 at 61 °C, respectively, which are much higher than those of the previously reported proton-conducting materials based on lanthanide metal ions. In addition, we also prove their proton-conducting nature by measuring the electron resistance via the Hebb–Wagner polarization technique and proton conduction via the D2O-exchange test. The 3D channel in the two compounds plays a key role in constructing an efficient proton transfer pathway via a hydrogen bonding network.

Graphical abstract: Inorganic open framework based on lanthanide ions and polyoxometalates with high proton conductivity

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Publication details

The article was received on 05 Feb 2018, accepted on 26 Mar 2018 and first published on 27 Mar 2018


Article type: Research Article
DOI: 10.1039/C8QI00108A
Citation: Inorg. Chem. Front., 2018,5, 1213-1217
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    Inorganic open framework based on lanthanide ions and polyoxometalates with high proton conductivity

    J. Wang, Y. Wang, M. Wei, H. Tan, Y. Wang, H. Zang and Y. Li, Inorg. Chem. Front., 2018, 5, 1213
    DOI: 10.1039/C8QI00108A

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