Zwitterionic liquid/acid mixtures as anhydrous proton conducting systems

Masahiro Yoshizawa, Douglas R. MacFarlane, Maria Forsyth, Hiroyuki Ohno

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Novel binary ILs based on zwitterionic liquids (ZILs) and a super strong acid, bis((trifluoromethyl)sulfonyl)amide (HTFSI), are prepared for anhydrous proton transport. Although both the ZILs used in this study and HTFSI are solid at room temperature, the mixtures became viscous liquids, which show only a glass transition, Tg, after mixing. The Tg of the mixtures decreased with increasing HTFSI content up to 50 %. The Tg then remained at -60 °C in the range of excess HTFSI content. The mixtures were thermally stable over 300 °C when HTFSI content was less than 40 %. The mixtures showed ionic conductivity around 10-4 S cm-1at room temperature when the HTFSI content was more than 50 %. When HTFSI content was 40 %, the mixture showed ionic conductivity of 10-2 S cm-1 at 150°C.

Original languageEnglish
Title of host publicationMolten Salts XIV - Proceedings of the International Symposium
Number of pages8
Publication statusPublished - 1 Dec 2006
Event206th ECS Meeting - Honolulu, United States of America
Duration: 3 Oct 20048 Oct 2004


Conference206th ECS Meeting
Country/TerritoryUnited States of America

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