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HL: Fachverband Halbleiterphysik

HL 59: Graphene: Applications, luminescence and spin relaxation (HL with O/TT)

HL 59.1: Vortrag

Mittwoch, 18. März 2015, 16:45–17:00, ER 270

Fabrication and Growth of Three-dimensional Graphene Electrodes with Controllable Pore Size — •Simon Drieschner, Michael Weber, Evangelos Makrygiannis, and Jose A. Garrido — Walter-Schottky-Institut, Physik Department, TU München, Am Coulombwall 4, 85748 Garching

Three-dimensional graphene-based electrodes combine graphene's unique properties like high conductivity, chemical inertness, and mechanical stability with a high surface to volume ratio, which could be of great interest for energy applications. However, tuning the pore size of 3D graphene networks is a non-trivial challenge, since the growth of graphene depends on the shape and structure of the metal substrate. Here we demonstrate the fabrication of 3D electrodes by using metal powder providing an interconnected scaffold which serves as substrate for the growth of graphene by chemical vapor deposition. The pore size distribution is shown to be controlled by the used metal particles and the growth temperature. After wet chemical etching of the metal catalyst, a freestanding and stable graphene foam of low mass and high crystalline crystal quality as confirmed by Raman spectroscopy is obtained. Cyclic voltammetry and electrochemical impedance spectroscopy measurements are used to confirm its excellent electrochemical properties. Our work highlights the great potential of these 3D graphene electrodes for energy storage and sensing applications.