Abstract
The properties of high-temperature phases of Et4NHSO4 and the temperature ranges of their stability were investigated. The sequence of the reversible phase transitions at 147°C and 160°C with the enthalpies of − 3.28 J/g and − 8.99 J/g, respectively, was observed. It was shown that at 160° C the I41/acd phase with the unit cell parameters a = 14.0430(8) Å, c = 25.686(3) Å with higher degree of sulfate tetrahedra disordering was formed. This phase exists up to the melting of Et4NHSO4, 245°C. The proton conductivity of Et4NHSO4 was determined firstly and the temperature dependence varies widely from 10−8 S/cm at 90°C up to ~ 10−2 S/cm at the melting. The conductivity of the Et4NHSO4 is rather low and does not exceed 5*10−6 S/cm at temperatures below 210°C. The structural closed dimers of hydrogen-bonded sulfate anions at low temperatures hinder the effective proton transfer. Spectral characteristics of room-temperature phase also have been discussed.
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Acknowledgements
The authors thank PhD Gerasimov K. B. for the investigation of the thermal properties of Et4NHSO4.
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This work was supported by the Russian Science Foundation grant no. 20–13-00302.
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Ponomareva, V.G., Bagryantseva, I.N., Bulina, N.V. et al. Proton conductivity and structural properties of tetraethylammonium hydrogen sulfate. Ionics 28, 4667–4674 (2022). https://doi.org/10.1007/s11581-022-04710-4
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DOI: https://doi.org/10.1007/s11581-022-04710-4