Proton Conductivity in Protic Ionic Lquids (PILs)

Protic ionic liquids (PILs) have attracted significant attention due to their promising properties and potential use in various applications. Recent studies revealed strong decoupling of proton conductivity from structure relaxation in a mixture of lidocaine with phosphoric acid, ¹ in which the proton conductivity of this mixture even exceeds that of phosphoric acid at the same viscosity. In this study, we selected bases that exhibit similar properties to lidocaine to facilitate the formation of hydrogen bonded networks to promote high proton diffusivity. Using broadband dielectric spectroscopy (BDS), the conductivity relaxation of several different mixtures with phosphoric acid can be compared and used to determine the best structures for increased conductivity.

1. Z. Wojnarowska, Y. Wang, K. J. Paluch, A. P. Sokolov, M. Paluch, Observation of highly decoupled conductivity in protic ionic conductors. Phys.Chem.Chem.Phys 2014, 16, 9123-9127.