Electrochemical Impedance Study on Poly(Alkylenedioxy)Thiophene Nanostructures: Solvent and Potential Effect
Conducting polymers can be doped and dedoped rapidly to a high charge density, hence, they can be applied as active materials for supercapacitors. Higher energy densities can be achieved because charging occurs through very thin thicknesses from the nano
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Electrochemical Impedance Study on Poly(Alkylenedioxy)Thiophene Nanostructures: Solvent and Potential Effect A. Sezai Sarac and Aslı Gencturk
Abstract Conducting polymers can be doped and dedoped rapidly to a high charge density, hence, they can be applied as active materials for supercapacitors. Higher energy densities can be achieved because charging occurs through very thin thicknesses from the nano to microscale range. Taking into account the costs and compatibility of the materials, the modification of carbon fiber by electrocoating of poly(3,4-alkylenedioxythiophene)s for microsupercapacitor applications seems to be a very attractive method. [3,4-(2,2-dimethylpropylenedioxy)thiophene] was electrodeposited cyclovoltametrically onto the carbon fiber micro electrode. An electrochemical impedance spectroscopic study was performed at applied potential, in different electrolytes and solvents and evaluated with our previous findings by reviewing.
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Introduction
Owing to its good electrochemical properties and its low oxidation potential, its high conductivity [1], unusual thermal stability in the oxidized state, poly(3,4 ethylenedioxythiophene) (PEDOT) has been widely investigated [1, 2]. The electron donating oxygen atoms in 3- and 4- position not only reduce the oxidation potential of the aromatic ring but also prevent α,β-coupling during the polymerization. The ethylene bridges minimize steric distortion effects resulting in a high stereoregularity of the polymer chain so that good-conjugation is guaranteed. Although in special fields of application PEDOT-type materials with improved properties were needed.
A. Sezai Sarac (&) A. Gencturk Department of Chemistry, Polymer Science and Technology, Istanbul Technical University, Maslak, 34469 Istanbul, Turkey e-mail: [email protected] URL: http://web.itu.edu.tr/*sarac/ © Springer International Publishing Switzerland 2016 H. Ünlü et al. (eds.), Low-Dimensional and Nanostructured Materials and Devices, NanoScience and Technology, DOI 10.1007/978-3-319-25340-4_18
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A. Sezai Sarac and A. Gencturk
The conductivity and stability of PEDOT makes it useful as a conducting electrode in electrochemical supercapacitors [3]. As a consequence different types of poly(3,4-alkylenedioxythiophene)s structurally related to PEDOT have been developed [4–6]. In comparison with PEDOT the structure of 3,4-(2,2-dimethylpropylenedioxy)thiophene (PProDOT-Me2) contains propylene bridges with quaternary central carbon and tetrahedral symmetry which should allow to stabilize [7] high levels of electrical charge. Poly [3,4-(2,2-dimethylpropylenedioxy)thiophene] (PProDOT-Me2) is a very promising candidate for use in electrochromic devices switching between slightly different colors than PEDOT [8] with higher coloration efficiency [9], higher electrochromic contrast ratio [10] and very fast switching times. Using PProDOT-Me2 several prototypes of devices [11–17] have been fabricated. The tetrahedral substitution pattern of PProDOT-Me2 causes the alkyl groups to be positioned above and b
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