Ionic liquids (ILs) are receiving great attention as solvent-free "green" electrolytes for high voltage supercapacitors because of their very low vapour pressure, wide electrochemical stability window and good conductivity at operating temperatures of supercapacitors-PEM fuel cell coupled systems for automotive application. We pursued the strategy of using ILs in hybrid supercapacitors with activated carbon (AC) as the negative electrode and poly(3-methylthiophene) (pMeT) as the positive, and we demonstrated the cycling stability over more than 15,000 galvanostatic cycles at 60°C of the supercapacitor with pyrrolidinium-based ionic liquid electrolyte. This result, obtained with high-purity IL, was achieved with still not-optimized electrode materials. Here we present and discuss the results of our study for the optimization of AC/IL/pMeT hybrid supercapacitor components.
Hybrid supercapacitors with ionic liquids as solvent-free electrolytes
MASTRAGOSTINO, MARINA;SOAVI, FRANCESCA;
2005
Abstract
Ionic liquids (ILs) are receiving great attention as solvent-free "green" electrolytes for high voltage supercapacitors because of their very low vapour pressure, wide electrochemical stability window and good conductivity at operating temperatures of supercapacitors-PEM fuel cell coupled systems for automotive application. We pursued the strategy of using ILs in hybrid supercapacitors with activated carbon (AC) as the negative electrode and poly(3-methylthiophene) (pMeT) as the positive, and we demonstrated the cycling stability over more than 15,000 galvanostatic cycles at 60°C of the supercapacitor with pyrrolidinium-based ionic liquid electrolyte. This result, obtained with high-purity IL, was achieved with still not-optimized electrode materials. Here we present and discuss the results of our study for the optimization of AC/IL/pMeT hybrid supercapacitor components.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
