The influence of pore size and surface area of activated carbons on the performance of ionic liquid based supercapacitors

This study analyses and compares the behaviour of 5 commercial porous carbons in the ionic liquid N-butyl-N-methylpyrrolidinium bis(trifluoromethanesulfonyl)imide (PYR14TFSI) and its mixture with propylene carbonate (PC) as electrolytes. The results of this investigation show that the existence of a...

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Bibliographic Details
Published in:Physical chemistry chemical physics : PCCP 2013-10, Vol.15 (40), p.17287-17294
Main Authors: POHLMANN, Sebastian, LOBATO, Belén, CENTENO, Teresa A, BALDUCCI, Andrea
Format: Article
Language:English
Subjects:
Adsorbents
Capacitance
Carbon
Chemistry
Colloidal state and disperse state
Electrolytes
Exact sciences and technology
General and physical chemistry
Ionic liquids
Pore size
Porosity
Porous materials
Propylene
Surface physical chemistry
Viscosity
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Summary:This study analyses and compares the behaviour of 5 commercial porous carbons in the ionic liquid N-butyl-N-methylpyrrolidinium bis(trifluoromethanesulfonyl)imide (PYR14TFSI) and its mixture with propylene carbonate (PC) as electrolytes. The results of this investigation show that the existence of a distribution of pore sizes and/or constrictions at the entrance of the pores leads to significant changes in the specific capacitance of the investigated materials. The use of PYR14TFSI as an electrolyte has a positive effect on the EDLC energy storage, but its high viscosity limits the power density. The mixture 50 : 50 wt% propylene carbonate-PYR14TFSI provides high operative voltage as well as low viscosity and thus notably enhances EDLC operation.
ISSN:1463-9076
1463-9084
DOI:10.1039/c3cp52909f