Nanometric ultracapacitors fabricated using multilayer of conducting polymers on self-assembled octanethiol monolayers |
| |
Authors: | David Aradilla Maria M. Pérez-Madrigal Francesc Estrany Denise Azambuja José I. Iribarren Carlos Alemán |
| |
Affiliation: | 1. Department of Chemical Engineering, E.T.S. d’Enginyers Industrials, Universitat Politècnica de Catalunya, Diagonal 647, 08028 Barcelona, Spain;2. Center for Research in Nano-Engineering, Universitat Politècnica de Catalunya, Campus Sud, Edifici C’, C/Pasqual i Vila s/n, E-08028 Barcelona, Spain;3. Department of Chemical Engineering, Escola Universitaria d’Enginyeria Tècnica Industrial de Barcelona, Universitat Politècnica de Catalunya, Comte d’Urgell 187, 08036 Barcelona, Spain;4. Institute of Chemistry, Federal University of Rio Grande do Sul, Av. Bento Gonçalves 9500, CEP 91501-970 Porto Alegre, RS, Brazil |
| |
Abstract: | Symmetric ultracapacitors have been fabricated considering nanometric 3-layered films made of alternated layers of poly(3,4-ethylenedioxythiophene) (external and internal layers) and polypyrrole (intermediate layer) deposited on steel uncoated and coated with octanethiol self-assembled monolayer. The highest electrochemical and capacitance parameters (i.e. electroactivity, doping level, stored charge, specific capacitance, Coulomb efficiency, energy density and power density) correspond to the ultracapacitor derived from the assembly of 3-layered films deposited on pre-treated steel. Thus, the interface separating the octanethiol monolayer and the most internal layer of the 3-layered film produces a very favorable interaction, which promotes important electrochemical benefits similar to those found for the interfaces in conventional multilayered films. Moreover, the pre-treatment of the steel electrode enhances the roughness and porosity of the film deposited on it, transmitting this effect layer-by-layer. Structural and morphological characteristics, which have been characterized using scanning electron microscopy and atomic force microscopy, have been related with the electrochemical and capacitance properties of the ultracapacitors. |
| |
Keywords: | Alkanethiols Conducting polymers Multilayered films Self-assembled monolayer Ultracapacitors |
本文献已被 ScienceDirect 等数据库收录! |
|