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Article

New Type of Nanocomposite CsH2PO4-UiO-66 Electrolyte with High Proton Conductivity

by
Valentina Georgievna Ponomareva
1,*,
Elena Sergeevna Shutova
1,
Konstantin Aleksandrovich Kovalenko
2 and
Vladimir Petrovich Fedin
2
1
Institute of Solid State Chemistry and Mechanochemistry SB RAS, Kutateladze, 18, 630128 Novosibirsk, Russia
2
Nikolaev Institute of Inorganic Chemistry, SB RAS, Ak. Lavrentiev, 3, 630090 Novosibirsk, Russia
*
Author to whom correspondence should be addressed.
Molecules 2022, 27(23), 8387; https://doi.org/10.3390/molecules27238387
Submission received: 1 November 2022 / Revised: 23 November 2022 / Accepted: 25 November 2022 / Published: 1 December 2022
(This article belongs to the Section Materials Chemistry)
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Abstract

New (1−x)CsH2PO4–xUiO-66 electrolytes with high proton conductivity and thermal stability at 230–250 °C were developed. The phase composition and proton conductivity of nanocomposites (x = 0–0.15) were investigated in detail. As shown, the UiO-66 matrix is thermally and chemically suitable for creating composites based on CsH2PO4. The CsH2PO4 crystal structure remains, but the degree of salt crystallinity changes in nanocomposites. As a result of interface interaction, dispersion, and partial salt amorphization, the proton conductivity of the composite increases by two orders of magnitude in the low-temperature range (up to 200 °C), depending on the UiO-66 fraction, and goes through a maximum. At higher temperatures, up to 250 °C, the conductivity of nanocomposites is close to the superprotonic values of the original salt at low UiO-66 values; then, it decreases linearly within one order of magnitude and drops sharply at x > 0.07. The stability of CsH2PO4-UiO-66 composites with high proton conductivity was shown. This creates prospects for their use as proton membranes in electrochemical devices.
Keywords: proton conductivity; cesium dihydrophosphate; UiO-66; surface interaction; nanocomposite electrolytes proton conductivity; cesium dihydrophosphate; UiO-66; surface interaction; nanocomposite electrolytes

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MDPI and ACS Style

Ponomareva, V.G.; Shutova, E.S.; Kovalenko, K.A.; Fedin, V.P. New Type of Nanocomposite CsH2PO4-UiO-66 Electrolyte with High Proton Conductivity. Molecules 2022, 27, 8387. https://doi.org/10.3390/molecules27238387

AMA Style

Ponomareva VG, Shutova ES, Kovalenko KA, Fedin VP. New Type of Nanocomposite CsH2PO4-UiO-66 Electrolyte with High Proton Conductivity. Molecules. 2022; 27(23):8387. https://doi.org/10.3390/molecules27238387

Chicago/Turabian Style

Ponomareva, Valentina Georgievna, Elena Sergeevna Shutova, Konstantin Aleksandrovich Kovalenko, and Vladimir Petrovich Fedin. 2022. "New Type of Nanocomposite CsH2PO4-UiO-66 Electrolyte with High Proton Conductivity" Molecules 27, no. 23: 8387. https://doi.org/10.3390/molecules27238387

APA Style

Ponomareva, V. G., Shutova, E. S., Kovalenko, K. A., & Fedin, V. P. (2022). New Type of Nanocomposite CsH2PO4-UiO-66 Electrolyte with High Proton Conductivity. Molecules, 27(23), 8387. https://doi.org/10.3390/molecules27238387

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