EFFECT OF SURFACTANT ON ELECTROCHEMICAL PROPERTIES OF SUPERCAPACITOR
Journal Title: Proceedings of Electrotechnical Institute Prace Instytutu Elektrotechniki - Year 2012, Vol 59, Issue 259
Abstract
The surface tension of liquids has a significant impact on the transport of mass and energy at the interface. In case of supercapacitor, where the charge is collected by the existence of electrical double layer at the interface between electrode and electrolyte, surface tension of an electrolyte reflects the wettability and affinity for the electrode material. The improvement of the wettability of electrode in the electrolyte increases the access of electrolyte to the surface of porous carbon electrode and accordingly better charge accumulation is achieved. It also results in a lower internal resistance of cell. In this work, impact of decreasing surface tension and increasing the electrolyte wetting properties on the electrochemical properties of supercapacitor were investigated. Improvement of these properties has been achieved through the inclusion of surfactant to electrolyte. Surfactants were added under critical micelle concentrations (CMC) to avoid surfactant tendency to form aggregates, that can block the pore in carbon electrode. Properties of electrochemical capacitor cell by cyclic voltammetry methods, galvanostatic charge and discharge and impedance spectroscopy were measured.
Authors and Affiliations
Aleksandra SZMAJA, Bronisław SZUBZDA
Keywords
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