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Open AccessArticle

Humidity-Mediated Anisotropic Proton Conductivity through the 1D Channels of Co-MOF-74

1
Department of Chemistry, Paderborn University, 33098 Paderborn, Germany
2
Institute of Physical Chemistry and Electrochemistry, Leibniz University Hannover, 30167 Hannover, Germany
3
Institute of Physics, University of Augsburg, 86159 Augsburg, Germany
*
Authors to whom correspondence should be addressed.
Nanomaterials 2020, 10(7), 1263; https://doi.org/10.3390/nano10071263
Received: 19 May 2020 / Revised: 20 June 2020 / Accepted: 21 June 2020 / Published: 28 June 2020
(This article belongs to the Section Synthesis, Interfaces and Nanostructures)
Large Co-MOF-74 crystals of a few hundred micrometers were prepared by solvothermal synthesis, and their structure and morphology were characterized by scanning electron microscopy (SEM), IR, and Raman spectroscopy. The hydrothermal stability of the material up to 60 °C at 93% relative humidity was verified by temperature-dependent XRD. Proton conductivity was studied by impedance spectroscopy, using a single crystal. By varying the relative humidity (70–95%), temperature (21–60 °C), and orientation of the crystal relative to the electrical potential, it was found that proton conduction occurs predominantly through the linear, unidirectional (1D) micropore channels of Co-MOF-74, and that water molecules inside the channels are responsible for the proton mobility by a Grotthuss-type mechanism. View Full-Text
Keywords: metal-organic framework; Co-MOF-74; single crystal; impedance spectroscopy; proton conductivity; anisotropy; fuel cell metal-organic framework; Co-MOF-74; single crystal; impedance spectroscopy; proton conductivity; anisotropy; fuel cell
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MDPI and ACS Style

Javed, A.; Strauss, I.; Bunzen, H.; Caro, J.; Tiemann, M. Humidity-Mediated Anisotropic Proton Conductivity through the 1D Channels of Co-MOF-74. Nanomaterials 2020, 10, 1263.

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