On the Rich Chemistry of Pseudo‐Protic Ionic Liquid Electrolytes

Author:

Wylie Luke1ORCID,Kéri Mónika2ORCID,Udvardy Antal2ORCID,Hollóczki Oldamur2ORCID,Kirchner Barbara1ORCID

Affiliation:

1. University of Bonn Clausius Institute of Physical and Theoretical Chemistry Mulliken Center for Theoretical Chemistry Beringstr. 4 53115 Bonn Germany

2. University of Debrecen Department of Physical Chemistry Egyetem tér 1 4032 Debrecen Hungary

Abstract

AbstractMixing weak acids and bases can produce highly complicated binary mixtures, called pseudo‐protic ionic liquids, in which a complex network of effects determines the physicochemical properties that are currently impossible to predict. In this joint computational‐experimental study, we investigated 1‐methylimidazole‐acetic acid mixtures through the whole concentration range. Effects of the varying ionization and excess of either components on the properties, such as density, diffusion coefficients, and overall hydrogen bonding structure were uncovered. A special emphasis was put on understanding the multiple factors that govern the conductivity of the system. In the presence of an excess of acetic acid, the 1‐methylimidazolium acetate ion pairs dissociate more efficiently, resulting in a higher concentration of independently moving, conducting ions. However, the conductivity measurements showed that higher concentrations of acetic acid improve the conductivity beyond this effect, suggesting in addition to standard dilution effects the occurrence of Grotthuss diffusion in high acid‐to‐base ratios. The results here will potentially help designing novel electrolytes and proton conducting systems, which can be exploited in a variety of applications.

Funder

National Research, Development and Innovation Office

Publisher

Wiley

Subject

General Energy,General Materials Science,General Chemical Engineering,Environmental Chemistry

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