In this paper we describe the preparation and the properties of a series of aprotic ionic liquid-based, proton-conducting membranes. The ionic liquids (ILs) 1,2-dimethyl-3-n-propylimidazolium bis(trifluoromethanesulfonyl)imide and the 3-methyl-1-n-propylpyridinium bis(trifluoromethanesulfonyl)imide are used as the casting solvents of PVdF gel-type membranes; the proton conductivity is achieved by the addition of a superacid component, namely, trifluoromethanesulfonic acid (HTf) or N,N-bis(trifluoromethanesulfonyl)imide (HTFSI). The polymer electrolytes showed good thermal and electrochemical properties in the temperature range of interest for PEMFC applications. The strong coordination between the ILs and the HTFSI, which have the same anion, improves the thermal stability of this kind of membrane, but lowers the chemical properties and the conductivity, due to an increase in viscosity. HTf-added samples have an ionic conductivity of 2 x 10(-2) S cm(-1) at 100 degrees C, showing the best overall properties and making these membranes of interest applications in fuel cells.
Aprotic ionic liquids as electrolyte components in protonic membranes / Alessandra, Fernicola; Navarra, MARIA ASSUNTA; Panero, Stefania. - In: JOURNAL OF APPLIED ELECTROCHEMISTRY. - ISSN 0021-891X. - STAMPA. - 38:7(2008), pp. 993-996. (Intervento presentato al convegno GEI ERA 2007 Conference tenutosi a Cagliari, ITALY nel JUL, 2007) [10.1007/s10800-008-9514-6].
Aprotic ionic liquids as electrolyte components in protonic membranes
NAVARRA, MARIA ASSUNTA;PANERO, Stefania
2008
Abstract
In this paper we describe the preparation and the properties of a series of aprotic ionic liquid-based, proton-conducting membranes. The ionic liquids (ILs) 1,2-dimethyl-3-n-propylimidazolium bis(trifluoromethanesulfonyl)imide and the 3-methyl-1-n-propylpyridinium bis(trifluoromethanesulfonyl)imide are used as the casting solvents of PVdF gel-type membranes; the proton conductivity is achieved by the addition of a superacid component, namely, trifluoromethanesulfonic acid (HTf) or N,N-bis(trifluoromethanesulfonyl)imide (HTFSI). The polymer electrolytes showed good thermal and electrochemical properties in the temperature range of interest for PEMFC applications. The strong coordination between the ILs and the HTFSI, which have the same anion, improves the thermal stability of this kind of membrane, but lowers the chemical properties and the conductivity, due to an increase in viscosity. HTf-added samples have an ionic conductivity of 2 x 10(-2) S cm(-1) at 100 degrees C, showing the best overall properties and making these membranes of interest applications in fuel cells.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.