Open AccessIon and Proton Transport In Aqueous/Nonaqueous Acidic Ionic Liquids for Fuel-Cell Applications—Insight from High-Pressure Dielectric Studies
Author(s) -
Ż. Wojnarowska,
Alyna Lange,
Andreas Taubert,
Marian Paluch
Publication year - 2021
Publication title -
acs applied materials and interfaces
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.535
H-Index - 228
eISSN - 1944-8252
pISSN - 1944-8244
DOI - 10.1021/acsami.1c06260
Subject(s) - ionic liquid , materials science , anhydrous , electrolyte , proton transport , electrochemistry , proton , dielectric , aqueous solution , ambient pressure , ion , conductivity , chemical engineering , ionic conductivity , chemical physics , inorganic chemistry , proton conductor , ion transporter , organic chemistry , chemistry , thermodynamics , catalysis , electrode , physics , optoelectronics , quantum mechanics , engineering
The use of acidic ionic liquids and solids as electrolytes in fuel cells is an emerging field due to their efficient proton conductivity and good thermal stability. Despite multiple reports describing conducting properties of acidic ILs, little is known on the charge-transport mechanism in the vicinity of liquid-glass transition and the structural factors governing the proton hopping. To address these issues, we studied two acidic imidazolium-based ILs with the same cation, however, different anions-bulk tosylate vs small methanesulfonate. High-pressure dielectric studies of anhydrous and water-saturated materials performed in the close vicinity of T g have revealed significant differences in the charge-transport mechanism in these two systems being undetectable at ambient conditions. Thereby, we demonstrated the effect of molecular architecture on proton hopping, being crucial in the potential electrochemical applications of acidic ILs.