Dresden 2014 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 12: Energy materials: Water splitting, batteries, and supercapacitors (with CPP/MM)

HL 12.7: Vortrag

Montag, 31. März 2014, 12:15–12:30, POT 081

Growth and characterization of 3D graphene networks for supercapacitors — •Simon Drieschner and Jose Antonio Garrido — Walter Schottky Institut, TU München, Am Coulombwall 4, 85748 Garching

The use of graphene as electrode material in supercapacitors has drawn great interest due to a suitable combination of material properties like high surface to volume ratio, high conductivity, and chemical stability. Since the capacitance of one single graphene sheet is rather limited, a continuous 3D network of graphene is expected to enhance the performance of graphene-based supercapacitors. We demonstrate the growth of 3D graphene by chemical vapor deposition (CVD) using a nickel foam as scaffold and a wet-etching transfer, yielding a freestanding macroporous graphene network of high crystalline quality, as shown by Raman spectroscopy. Cyclic voltammetry, charge-discharge measurements, and electrochemical impedance spectroscopy are used to assess the potential of 3D networks of CVD graphene for energy storage applications. We also compare the electronic double layer capacitance of bare graphene foam to the pseudo-capacitance introduced by conductive polymers.

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