Berlin 2015 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 71: New concepts and new materials

HL 71.8: Vortrag

Donnerstag, 19. März 2015, 12:00–12:15, EW 201

Graphene 3D Electrodes for Energy Storage Applications — •Evangelos Makrygiannis, Simon Drieschner, Michael Weber, and Jose A. Garrido — Walter-Schottky-Institut, Physik Department, TU München, Am Coulombwall 4, 85748 Garching

Due to its unique properties like high conductivity, chemical stability, and high surface to volume ratio, graphene meets the most essential requirements for fabricating electrodes with high electrical double layer capacitance for supercapacitor applications. Here we present the fabrication and characterization of graphene foam based electrodes for energy storage applications. Chemical vapor deposition (CVD) is used to grow graphene foam samples with nickel foam as a substrate. Different growth parameters are investigated in order to obtain stable three-dimensional structures as well as to achieve high graphene quality, which is confirmed by Raman spectroscopy. To decrease the equivalent series resistance and to have a highly inert contact, multilayer CVD graphene sheet was used to connect the foam to the current collector. Cyclic voltammetry, electrochemical impedance spectroscopy, and charge discharge measurements in various electrolytes are performed to assess the potential of these three-dimensional graphene electrodes for energy storage applications.