Incorporation of ammonium ions in Cs2(HSO4)(H2PO4) confirmed by solid-state NMR

Incorporation of ammonium ions in Cs2(HSO4)(H2PO4) confirmed by solid-state NMR Inorganic solid acid salt Cs2(HSO4)(H2PO4) showed high proton conductivity in the superprotonic phase, and the phase was retained on cooling even at room temperature for a long period. In the present work, we attempt partial replacement of Cs ions by ammonium ions. Incorporation of ammonium ions up to 2.3% of the total cations is succeeded. Successful incorporation of ammonium ions is confirmed by the crystal structure measured by X-ray powder diffraction, the phase transition measured by thermal analyses and phosphorus environments measured by 31P magic-angle-spinning (MAS) NMR. Furthermore, we present 1H and 133Cs MAS NMR spectra and the result of 1H{31P} rotational-echo double resonance (REDOR) experiments. The 1H and 133Cs MAS NMR spectra show that incorporation of ammonium ions leads to increase of disordered structures. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Solid State Ionics Elsevier

Incorporation of ammonium ions in Cs2(HSO4)(H2PO4) confirmed by solid-state NMR

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Publisher
Elsevier
Copyright
Copyright © 2017 Elsevier B.V.
ISSN
0167-2738
eISSN
1872-7689
D.O.I.
10.1016/j.ssi.2017.09.015
Publisher site
See Article on Publisher Site

Abstract

Inorganic solid acid salt Cs2(HSO4)(H2PO4) showed high proton conductivity in the superprotonic phase, and the phase was retained on cooling even at room temperature for a long period. In the present work, we attempt partial replacement of Cs ions by ammonium ions. Incorporation of ammonium ions up to 2.3% of the total cations is succeeded. Successful incorporation of ammonium ions is confirmed by the crystal structure measured by X-ray powder diffraction, the phase transition measured by thermal analyses and phosphorus environments measured by 31P magic-angle-spinning (MAS) NMR. Furthermore, we present 1H and 133Cs MAS NMR spectra and the result of 1H{31P} rotational-echo double resonance (REDOR) experiments. The 1H and 133Cs MAS NMR spectra show that incorporation of ammonium ions leads to increase of disordered structures.

Journal

Solid State IonicsElsevier

Published: Nov 15, 2017

References

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