The role played by carbon porosity and electrolyte chemistry in the development of double-layer supercapacitors based on solvent-free ionic liquids (ILs) of wide electrochemical stability window is investigated. Voltammetric studies performed in N-methyl-N-butyl-pyrrolidinium bis(trifluoromethanesulfonyl)imide (PYR14TFSI), N-trimethyl-N-propylammonium bis(trifluoromethanesulfonyl)imide (N1113TFSI), N-methyl-N-butyl-pyrrolidinium tris(pentafluoroethyl)trifluorophosphate (PYR14FAP) ionic liquids, and PYR14TFSI – tetraethyl ammonium bis(trifluoromethanesulfonyl)imide (N2222TFSI) solutions demonstrate that the pore-to-ion size ratio and porous electrode/IL interface properties may have a higher impact on electrode electrical response than the inherent IL bulk properties. The effect of carbon porosity on the electrode capacitance and charge storage capability in both the positive and negative potential domains is discussed in relation to the IL properties and an estimation of the upper limits of the performance of IL-based supercapacitors with carbons of optimized porosity is reported .
M. Lazzari, M. Mastragostino, A. G. Pandolfo, V. Ruiz, F. Soavi (2011). Role of carbon porosity and ion size in the development of ionic liquid based supercapacitors. JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 158(1), A22-A25 [10.1149/1.3514694].
Role of carbon porosity and ion size in the development of ionic liquid based supercapacitors
LAZZARI, MARIACHIARA;MASTRAGOSTINO, MARINA;SOAVI, FRANCESCA
2011
Abstract
The role played by carbon porosity and electrolyte chemistry in the development of double-layer supercapacitors based on solvent-free ionic liquids (ILs) of wide electrochemical stability window is investigated. Voltammetric studies performed in N-methyl-N-butyl-pyrrolidinium bis(trifluoromethanesulfonyl)imide (PYR14TFSI), N-trimethyl-N-propylammonium bis(trifluoromethanesulfonyl)imide (N1113TFSI), N-methyl-N-butyl-pyrrolidinium tris(pentafluoroethyl)trifluorophosphate (PYR14FAP) ionic liquids, and PYR14TFSI – tetraethyl ammonium bis(trifluoromethanesulfonyl)imide (N2222TFSI) solutions demonstrate that the pore-to-ion size ratio and porous electrode/IL interface properties may have a higher impact on electrode electrical response than the inherent IL bulk properties. The effect of carbon porosity on the electrode capacitance and charge storage capability in both the positive and negative potential domains is discussed in relation to the IL properties and an estimation of the upper limits of the performance of IL-based supercapacitors with carbons of optimized porosity is reported .I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
