RT Journal Article
T1 Anomalous behaviour of the ionic conductivity of nanoconfined IL -lithium salt mixtures
A1 Vallet Moreno, Pablo
A1 Parajó Vieito, Juan José
A1 Santiago Alonso, Antía
A1 Villanueva López, María
A1 Cabeza, Óscar
A1 Varela Cabo, Luis Miguel
A1 Salgado Carballo, Josefa
K1 Ethylimidazolium nitrate
K1 Quasi-solid electrolytes
K1 Thermal behaviour
K1 Ionic conductivity
K1 Electrochemical devices
AB The effect of salt addition on the protic ionic liquid (IL) ethylimidazolium nitrate is analysed in this work in terms of structural changes measured by NMR, thermal behaviour and ionic conductivity. Additionally, the effect of the immobilization of these mixtures in nano-silica structures on the same properties is also studied. Results show that the influence of salt on the chemical shifts of the signals associated to hydrogen atoms in the apolar regions of the ionic liquid is almost negligible, both in liquid and gel states. The salt accommodates in the polar region of the IL, according to the nanostructured solvation paradigm. The liquid range increases with salt concentration in both states, being this effect especially interesting for high and low temperature applications. The ionic conductivity takes appropriate values to use these compounds as electrolytes in electrochemical devices; pure IL presents 6.9 mS·cm−1 at 298 K rising to 17.38 mS·cm−1 at 323 K and this property decreases with salt concentration in the liquid state, as can be expected. Although gel samples present lower ionic conductivity than liquid samples, an anomalous behaviour can be observed in the ionogel samples upon the salt concentration, characterized by an absolute maximum, 13.26 mS·cm−1 at 323 K, at the lowest salt concentration (0.5 mol·kg−1 of Li+ salt addition), which represents the 12 % higher than the corresponding values of pure ionogel at this temperature.
PB Elsevier
SN 0167-7322
YR 2024
FD 2024-04-04
LK https://hdl.handle.net/10347/45162
UL https://hdl.handle.net/10347/45162
LA eng
NO Vallet, P., Parajó, J. J., Santiago-Alonso, A., Villanueva, M., Cabeza, Ó, Varela, L. M., & Salgado, J. (2024). Anomalous behaviour of the ionic conductivity of nanoconfined IL -lithium salt mixtures. Journal of Molecular Liquids, 401, 124630. 10.1016/j.molliq.2024.124630
NO Authors acknowledge M. Gómez and M. Martín-Pastor (RIAIDT-USC) for their technical support in DSC and NMR measurements, respectively. This work was founded by Spanish Ministry of Economy and Competitiveness and FEDER Program through the project MAT2017-89239-C2. Vallet, J. J. Parajó and A. Santiago-Alonso thank funding support of FPI Program from Spanish Ministry of Science, Education and Universities, I2C postdoctoral and predoctoral Programs of Xunta de Galicia, respectively.
DS Minerva
RD 30 abr 2026