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Summary: Hydrogen Redox in Protic Ionic Liquids and a Direct Measurement of Proton
Thermodynamics
J. A. Bautista-Martinez,
L. Tang,
J.-P. Belieres,
R. Zeller,
C. A. Angell,
and C. Friesen*,
School of Materials, and Department of Chemistry and Biochemistry, Arizona State UniVersity Tempe,
Arizona 85287
ReceiVed: March 26, 2009; ReVised Manuscript ReceiVed: May 4, 2009
Room temperature ionic liquids have attracted a great deal of interest in recent years due to their remarkable
physicochemical properties including high thermal stability, wide electrochemical window, and low vapor
pressure. A subclass of ionic liquids, protic ionic liquids (PILs), are formed by proton transfer from a Brønsted
acid to a Brønsted base, and are good candidates as electrolytes in several applications, including fuel cells,
because they integrate high ionicity and proton exchange kinetics with low vapor pressure. Here we present
hydrogen redox results for a number of hydrogen-saturated PILs. Specifically we study the systems
diethylmethylammonium bistrifluoromethanesulfonimide, diethylmethylammonium chloroaluminate, triethy-
lammonium triflate, diethylmethylammonium triflate, dimethylethylammonium triflate, ethylammonium nitrate,
pyridinium acetate, triethylammonium methane sulfonate, diethylmethylammonium methane sulfonate, and
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