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RAS Chemistry & Material ScienceНеорганические материалы Inorganic Materials

  • ISSN (Print) 0002-337X
  • ISSN (Online) 3034-5588

Electrical Transport and Structural Characteristics of Composite Electrolytes Based on Caesium Pentahydrodiphosphate

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PII
S3034558825060078-1
DOI
10.7868/S3034558825060078
Publication type
Article
Status
Published
Authors
T.D. Demakova
  • Affiliation:
    Institute of Solid State Chemistry and Mechanochemistry SB of the Russian Academy of Sciences
    Novosibirsk State University
V.G. Ponomareva
  • Affiliation: Institute of Solid State Chemistry and Mechanochemistry SB of the Russian Academy of Sciences
Volume/ Edition
Volume 61 / Issue number 11-12
Pages
743-755
Abstract
The possibility of creating composite proton electrolytes with the addition of nanodiamond (ND) to caesium pentahydrodiphosphate has been studied. Changes in the structural properties of salt in the composite, morphology, and proton conductivity depending on the composition for (1 – x)CsH(PO) – xND (x – mole fraction) in a wide range of compositions (x = 0 – 0.99) are considered. It is shown that there is no chemical interaction between the components and the structure of CsH(PO) (P2/c) with an increase in the proportion of ND is preserved during the dispersion and partial amorphization of the salt. Using IR spectroscopy, information was obtained on the mechanism of formation of composite electrolytes due to partial binding of salt protons to surface OH ND's hydroxo groups. This leads to the formation of a weaker network of hydrogen bonds in CsH(PO). A uniform distribution of salt particles in composites and a decrease in particle size as a result of the interfacial surface interaction of the components are shown. Melting enthalpy of CsH(PO) decreases disproportionately to the salt content with an increase in the proportion of ND due to an increase in the proportion of the amorphous phase in the composites. There is a significant increase in the proton conductivity of CsH(PO) in composites to two orders of magnitude with a maximum at x = 0.9 and a decrease at x > 0.95 due to the "percolation effect" of the "conductor-insulator" type. The activation energy of the conductivity of composites decreases slightly. The studied composites have a relatively high proton conductivity at medium temperatures and chemical stability, which creates prospects for their use as proton membranes of electrochemical devices.
Keywords
пентагидродифосфат цезия наноалмаз композиционные электролиты протонная проводимость
Date of publication
01.04.2025
Year of publication
2025
Number of purchasers
0
Views
19

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