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Title: Ion and proton transport in aqueous/nonaqueous acidic ionic liquids for fuel-cell applications - insight from high-pressure dielectric studies
Authors: Wojnarowska, Żaneta
Lange, Alyna
Taubert, Andreas
Paluch, Marian
Keywords: proton hopping; dielectric spectroscopy; high pressure; ion transport; acidic ionic liquids
Issue Date: 2021
Citation: "ACS Applied Materials and Interfaces" (2021), iss. 26, s. 30614-30624
Abstract: 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 chargetransport mechanism in the vicinity of liquid−glass transition and the structural factors governing the proton hopping. To address these issues, we studied two acidic imidazoliumbased 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 Tg 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.
DOI: 10.1021/acsami.1c06260
ISSN: 1944-8244
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