Naslov
Pseudocapacitive properties of PEDOT/GO layer prepared by one-step electrochemical method

Autori
Ljubek, Gabrijela ; Kraljić Roković, Marijana

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, neobjavljeni rad, ostalo

Skup
69th Annual Meeting of the International Society of Electrochemistry

Mjesto i datum
Bologna, Italija, 02.09.2018. - 07.09.2018

Vrsta sudjelovanja
Poster

Vrsta recenzije
Nije recenziran

Ključne riječi
PEDOT ; graphene ; graphene oxide

Sažetak
Poly(3, 4-ethylenedioxythiophene) (PEDOT) is one of the most attractive conductive polymer in terms of practical applications especially in energy conversion and storage devices such as solar cells, supercapacitors and fuel cells [1]. PEDOT has excellent properties, including low-cost, flexibility and good electrical conductivity which results in fast electrochemical redox reaction. However, the major drawback is low cycling stability due to its poor mechanical strength [2]. In order to improve this properties composites of PEDOT and graphene or graphene oxide (GO) have been synthesized by chemical or electrochemical polymerization. Generally, electropolymerization of PEDOT requires organic media, but in terms of environmental and economic requests, aqueous solutions are more preferable. Moreover, by adding the surfactants or polyelectrolytes to the aqueous solutions it is possible to: increase the low solubility of 3, 4-ethylenedioxythiophene (EDOT) in water, reduce the EDOT oxidation potential, accelerate EDOT polymerization and improve PEDOT mechanical and hole- transport properties [3]. In this work, electrochemical polymerization of PEDOT/GO layers was carried out at constant potential in an aqueous solution containing 0.02 mol dm-3 EDOT monomer and 0.01 mol dm-3 poly(4- styrene sulfonate) (PSS) as supporting electrolyte with addition of 2 mg ml-1 GO. The presence of PSS can enhance not only the polymerization step but also the morphology and microstructure of PEDOT layer. It was expected that, beside PSS anion, GO will also be incorporated within the PEDOT layer as negative counter ion. Therefore, this method was considered to be one-step electrochemical method for PEDOT/GO composite layer preparation. The incorporation of GO could significantly increase cycling stability as well as porosity of the material. According to this, improved pseudocapacitive properties suitable for supercapacitor application were expected for composite materials. Morphological and structural properties of the obtained layers were characterized by means of scanning electron microscopy and UV/Vis spectroscopy. The pseudocapacitive properties were determined in 0.1 mol dm-3 KCl solution by using cyclic voltammetry and electrochemical impedance spectroscopy methods.

Izvorni jezik
Engleski

Znanstvena područja
Kemijsko inženjerstvo, Temeljne tehničke znanosti

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