7
views
0
recommends
+1 Recommend
0 collections
    0
    shares
      • Record: found
      • Abstract: found
      • Article: not found

      Synthesis, Characterization, and Proton Conduction Behavior of Thorium and Cerium Phosphonates

      research-article
      , , ,
      ACS Omega
      American Chemical Society

      Read this article at

      ScienceOpenPublisherPMC
      Bookmark
          There is no author summary for this article yet. Authors can add summaries to their articles on ScienceOpen to make them more accessible to a non-specialist audience.

          Abstract

          Thorium (Th 4+) and cerium (Ce 4+) phosphonates have been synthesized by the sol–gel method using various phosphonic acids and analyzed using elemental and CHN analysis, spectral analysis (Fourier transform infrared spectroscopy and X-ray diffraction), thermogravimetric analysis, scanning electron microscopy, and energy-dispersive X-ray spectroscopy. The proton transport study was performed by measuring proton conductance at different temperatures using an impedance analyzer. The Grotthuss mechanism of the proton conduction has been discussed thoroughly on the basis of results obtained from the impedance measurement; the specific proton conduction (σ) and activation energy ( E a) have been evaluated and compared with the reported proton-conducting system having similar phosphonate moieties.

          Related collections

          Most cited references50

          • Record: found
          • Abstract: not found
          • Article: not found

          Applications of water stable metal–organic frameworks

            Bookmark
            • Record: found
            • Abstract: found
            • Article: not found

            Facile proton conduction via ordered water molecules in a phosphonate metal-organic framework.

            A new phosphonate metal-organic framework (MOF) with a layered motif but not that of the classical hybrid inorganic-organic solid is presented. Zn(3)(L)(H(2)O)(2)·2H(2)O (L = [1,3,5-benzenetriphosphonate](6-)), henceforth denoted as PCMOF-3, contains a polar interlayer lined with Zn-ligated water molecules and phosphonate oxygen atoms. These groups serve to anchor free water molecules into ordered chains, as observed by X-ray crystallography. The potential for proton conduction via the well-defined interlayer was studied by (2)H solid-state NMR spectroscopy and AC impedance spectroscopy. The proton conductivity in H(2) was measured as 3.5 × 10(-5) S cm(-1) at 25 °C and 98% relative humidity. More interestingly, an Arrhenius plot gave a low activation energy of 0.17 eV for proton transfer, corroborating the solid-state NMR data that showed exchange between all deuterium sites in the D(2)O analogue of PCMOF-3, even at -20 °C.
              Bookmark
              • Record: found
              • Abstract: found
              • Article: not found

              A water-stable metal-organic framework with highly acidic pores for proton-conducting applications.

              Metal-organic framework (MOF) materials are a nontraditional route to ion conductors, but their crystallinity can give insight into molecular-level transport mechanisms. However, some MOFs can be structurally compromised in humid environments. A new 3D metal-organic framework, PCMOF-5, is reported which conducts protons above 10(-3) S/cm at 60 °C and 98% relative humidity. The MOF contains free phosphonic acid groups, shows high humidity stability, and resists swelling in the presence of hydration. Channels filled with crystallographically located water and acidic groups are also observed.
                Bookmark

                Author and article information

                Journal
                ACS Omega
                ACS Omega
                ao
                acsodf
                ACS Omega
                American Chemical Society
                2470-1343
                19 February 2019
                28 February 2019
                : 4
                : 2
                : 3716-3725
                Affiliations
                []Department of Chemistry, Sardar Patel University , Vallabh Vidyanagar 388 120, Gujarat, India
                []Applied Chemistry Department, The M.S. University of Baroda , Vadodara 390 001, Gujarat, India
                Author notes
                Article
                10.1021/acsomega.8b03468
                6648900
                31459584
                52724470-b829-432b-9a26-db68ecb75c76
                Copyright © 2019 American Chemical Society

                This is an open access article published under an ACS AuthorChoice License, which permits copying and redistribution of the article or any adaptations for non-commercial purposes.

                History
                : 11 December 2018
                : 05 February 2019
                Categories
                Article
                Custom metadata
                ao8b03468
                ao-2018-03468u

                Comments

                Comment on this article