Original scientific paper
Use of Polymers and their Composites with Ruthenium Oxide as Active Electrode Materials in Electrochemical Supercapacitors
Suzana SOPČIĆ
; University of Zagreb, Faculty of Chemical Engineering and Technology, Zagreb
Marijana KRALJIĆ-ROKOVIĆ
; University of Zagreb, Faculty of Chemical Engineering and Technology, Zagreb
Zoran MANDIĆ
; University of Zagreb, Faculty of Chemical Engineering and Technology, Zagreb
Višnja HORVAT-RADOŠEVIĆ
; Ruđer Bošković Institute, Zagreb
Krešimir KVASTEK
; Ruđer Bošković Institute, Zagreb
Abstract
The composite electrodes consisting of ruthenium oxide and polyaniline as active electrode materials, as well as poly(vinylidene fl uoride) and Nafi on® (ethanesulfonyl fl uoride, 2-[1-[difl uoro-[(trifl uoroethenyl)oxy]methyl]-1,2,2,2-tetrafl uoroethoxy]-1,1,2,2,-tetrafl uoro- tetrafl uoroethylene) as binders were synthesized and investigated as electrode materials for applications in electrochemical supercapacitors. The composite electrodes were synthesized by casting a suspension of different amounts of ruthenium oxide in the solutions of the corresponding binders onto the glassy carbon electrodes. Various quantities of polyaniline were deposited onto the composite electrodes by the cyclic voltammetry method using different number of potential cycles. The electrochemical properties of the composite electrodes were investigated by cyclic voltammetry and electrochemical impedance spectroscopy techniques. The specific capacitances obtained were compared and the charging/discharging mechanism was elucidated. The results show that the overall properties of the composite electrodes strongly depend on the quantities of different components in the mixture and the type of the binder. The best electrochem ical properties were achieved when poly(vinylidene fl uoride) was used as a binder. In this case utilization of RuO2 was maximized and specifi c capacitance higher than 500 F/g was achieved. After the deposition of PANI on this composite, specifi c capacitance was increased to 700 F/g. The difference in the behaviour between two binders is explained by the difference in their physical and chemical properties and the different role they assume in the resulting composite materials.
Keywords
electrochemical supercapacitors; Nafion®; poly(vinylidene fluoride); polyaniline; ruthenium oxide
Hrčak ID:
55900
URI
Publication date:
14.7.2010.
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