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Cited by 683

The DOI matches its Crossref record; 9 of the 9 references it cites were found in a registry or an index.

Brønsted Acid−Base Ionic Liquids as Proton-Conducting Nonaqueous Electrolytes

Noda, Akihiro, Susan, Md. Abu Bin Hasan, Kudo, Kenji, Mitsushima, Shigenori, Hayamizu, Kikuko, Watanabe, Masayoshi·2003·The Journal of Physical Chemistry B
DOI 10.1021/jp022347p
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Abstract

A new series of Brønsted acid−base ionic liquids were derived from the controlled combination of a monoprotonic acid with an organic base under solvent-free conditions. Appropriate amounts of solid bis(trifluoromethanesulfonyl)amide (HTFSI) and solid imidazole (Im) were mixed at various molar ratios to have compositions varying from an equimolar salt to HTFSI- or Im-rich conditions. The mixture at equivalent molar ratio formed a protic neutral salt with a melting point of 73 °C, which was thermally stable at temperatures even above 300 °C. The melting points of other compositions were lower than those of the equimolar salt and Im or HTFSI, giving eutectics between the equimolar salt and HTFSI or Im. Some of the compositions with certain molar ratios of Im and HTFSI were liquid at room temperature. For Im excess compositions, the conductivity was found to increase with increasing Im mole fraction, and the 1 H NMR chemical shift of the proton attached to the nitrogen atom of Im was shifted to a lower magnetic field. On the contrary, the conductivity decreased with increasing HTFSI mole fraction, and the 1 H NMR chemical shift of the proton attached to the TFSI imide anion also shifted to a higher magnetic field. Self-diffusion coefficients, measured by pulsed-gradient spin−echo NMR (PGSE-NMR) methods in Im- or HTFSI-rich compositions, indicated that fast proton exchange reactions between the protonated Im cation and Im take place in excess Im. The proton conduction follows a combination of Grotthuss- and vehicle-type mechanisms. Direct current polarization measurements were used for the confirmation of proton conduction in Im-rich compositions. Furthermore, reduction of molecular oxygen could be observed at the interface between a Pt electrode and these ionic liquids. This introduces the Brønsted acid−base ionic liquid system as a new candidate for proton conductor such as a fuel cell electrolyte to operate under anhydrous conditions and at elevated temperature.

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Metadata

Authors
Noda, A., Susan, M. A. B. H., Kudo, K., Mitsushima, S., Hayamizu, K., & Watanabe, M.
Venue
The Journal of Physical Chemistry B
Publisher
American Chemical Society (ACS)
Published
2003-04-04
Volume
107
Issue
17
Pages
4024-4033
ISSN
  • 1520-5207 (ISSN-L)
  • 1520-6106
DOI
10.1021/jp022347p
OpenAlex
W1996861650
Cited by
683
References
9
FWCI
15.26
Type
journal article
Language
en
Open access
closed

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