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Proton Conduction in Organically Templated 3D Open-Framework Vanadium–Nickel Pyrophosphate

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journal contribution
posted on 14.03.2019, 15:52 by Le Zhang, Xinxin Liu, Xuejiao Sun, Juan Jian, Guanghua Li, Hongming Yuan
A new proton-conducting material (C6H14N2)­[NiV2O6H8(P2O7)2]·2H2O (1) was hydrothermally synthesized by using 1,4-diazabicyclo­[2,2,2]­octane (DABCO) as the template. Its inorganic framework, determined by single crystal X-ray diffraction, is constructed by the connection of V/NiO6 octahedral to P2O7 pyrophosphate units through sharing oxygen atoms, giving rise to three-dimensional (3D) intersecting 6-, 8-, and 12-ring channels along the [100], [010], and [001] directions, respectively, in which there are ordered protonated DABCO cations balancing negative charge of the framework and disordered water molecules. Complex impedance measurements on polycrystalline samples gave proton conductivities of 4.9 × 10–3 and 2.0 × 10–2 S cm–1 at 25 and 60 °C under high humidity conditions, respectively. The activation energy is 0.38 eV.