engleski

PEDOT-based composites prepared by one-step electrochemical method for supercapacitors applications

Poly(3, 4-ethylenedioxythiophene) (PEDOT) is a conductive polymer which already has a brief history of being used as an active material in supercapacitors. It is mostly due its low-cost, flexibility and good electrical conductivity, which results in fast electrochemical reactions. However, the major drawback is low cycling stability duo to its poor mechanical strength [1]. Another disadvantage is its limited capacitance due to the low utilisation of the material. The activity of PEDOT is decreased by limited ion transport in the bulk of material [2]. To solve this problems, composites of PEDOT and graphene or its derivatives has gained a lot of scientific ground during the last few years, especially in the field of supercapacitors. In this work, a facile and one-step electrochemical method is introduced for incorporating graphene oxide (GO) into PEDOT layer in the presents of poly(4-styrene sulfonate) (PSS) as supporting electrolyte. The presence of PSS can enhance not only the polymerization step but also the morphology and microstructure of PEDOT layer. The incorporation of GO could significantly increase cycling stability as well as porosity of the material. Morphological and structural properties of the obtained layers were characterized by means of scanning electron microscopy and UV/Vis spectroscopy. By using cyclic voltammetry and electrochemical impedance spectroscopy (EIS) methods it was shown that all prepared materials exhibited good capacitive properties in 0.1 mol dm-3 KCl solution. The prepared materials were used to assemble symmetric supercapacitors that were tested by cyclic voltammetry and EIS methods. The stability of the supercapacitors was determined by charging/discharging at constant current during 1000 cycles.

PEDOT, graphene, supercapacitors

nije evidentirano