Composite Proton Electrolytes Based on Acid Salts

• Published in: Inorganic materials : applied research 2023-04, Vol.14 (2), p.317-324
• Main Authors: Timakov, I. S., Grebenev, V. V., Komornikov, V. A., Prokudin, S. V.
• Format: Article
• Language: English
• Subjects: Chemistry; Chemistry and Materials Science; Composite materials; Crystallization; Electrolytes; Industrial Chemistry/Chemical Engineering; Inorganic Chemistry; Materials for Power Industry and Radiation Resistant Materials; Materials Science; Phase composition; Polytetrafluoroethylene; Protons; Room temperature; Spatial distribution; Synthesis; X ray powder diffraction
• ISSN: 2075-1133; 2075-115X
• DOI: 10.1134/S2075113323020478

The problem of high plasticity and fluidity of acidic salt phases with high proton conductivity, such as superprotonic crystals of the M m H n (AO 4 ) ( m + n )/2 · y H 2 O family (where M = NH 4 , K, Rb, Cs and A = P, As, S, Se), is studied. Various methods are chosen for the synthesis of composite materials based on proton conductor Cs 6 (SO 4 ) 3 (H 3 PO 4 ) 4 with the formation of a three-dimensional reinforcing fabric over the entire volume of the obtained material. For the first time, the temperature dependences of the hardness and elasticity of polycrystalline salt Cs 6 (SO 4 ) 3 (H 3 PO 4 ) 4 pressed into a tablet are measured before and after the transition to the superprotonic state. Composite materials with compositions x Cs 6 (SO 4 ) 3 (H 3 PO 4 ) 4 (1 – x )teflon and x Cs 6 (SO 4 ) 3 (H 3 PO 4 ) 4 (1 – x )[SiOR] n (where 0.95 ≥ x ≥ 0.5 wt %) are synthesized by the following two methods: melt casting and crystallization in a mold. The dependence of the phase composition of the obtained materials on the ratio of components is studied by the room temperature powder X-ray diffraction method. The spatial distribution of phases in the synthesized composite materials is studied by scanning electron microscopy. It is shown that the conductive phase is enveloped upon increasing the fraction of the reinforcing component. The conductivity of the composite materials is investigated by impedance spectroscopy.