Berlin 2015 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 71: New concepts and new materials

HL 71.9: Vortrag

Donnerstag, 19. März 2015, 12:15–12:30, EW 201

Conductive polymers on microporous graphene based electrodes for supercapacitor applications — •Michael Weber, Simon Drieschner, Evangelos Markrygiannis, and Jose A. Garrido — WSI,Physik-Departement,Technische Universität München,James-Franck-Str.1,85748 Garching,Germany

Conductive polymers have been studied as pseudocapacitive electrode material owing to their high specific capacitance and high reaction rates. In order to increase the surface area and to have a efficient charge tranfer, a highly conductive three-dimensional current collector is required for supercapacitors providing high power density. Graphene-based electrodes have a high specific area, a high conductivity and are chemical inert, which makes them a promising current collector material for supercapacitor applications.

Here we present three dimensional graphene electrodes coated with conductive polymers by electropolymerization and chemical polymerization for supercapacitor electrodes. As conductive polymers polyaniline, polypyrrole and polyphenylene were polymerized with different polymerization parameters like temperature and concentration. Polyaniline and polypyrrole are moderate conductive p-doped polymers, chemically stable in aqueous solutions and can be polymerized out of inexpensive precursers. Polyphenylene is a p- or n-doped conductive polymer which enables it to be operated in a high potential window in non-aqueous electrolytes. Their potential for supercapacitors is confirmed by cyclic voltammetry, electrochemical impedance spectroscopy and charge-discharge measurements.