Dresden 2009 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 9: Poster 1
HL 9.8: Poster
Montag, 23. März 2009, 14:30–17:00, P2
Carbon aerogel electrodes for electrochemical double-layer capacitors based on resorcinol-formaldehyde sediments — •Mario Zeller1, Volker Lorrmann1, Dirk Hauschild2, Jens Pflaum1,2, Gudrun Reichenauer1, and Vladimir Dyakonov1,2 — 1Bavarian Centre for Applied Energy Research e.V. (ZAE Bayern), D-97074 Würzburg — 2Julius-Maximilians-University of Würzburg, Institute of Physics, Experimental Physics VI, D-97074 Würzburg
Carbon aerogels are promising candidates for electrochemical doublelayer capacitors (EDLC) electrodes, because their microstructure is tuneable over a broad range. EDLC electrodes based on monolithic carbon aerogel offer an excellent electrical conductivity, however, they are very brittle.
We prepared binder electrodes based on carbon aerogel powder via pyrolysis of resorcinol-formaldehyde sediments. The influence of the respective preparation parameters, such as the concentration of the catalyst on the pore size distribution, surface and micropore properties, was evaluated by means of nitrogen sorption. Scanning electron microscopy was used to determine the size of the carbon particles.
For electrochemical investigation of the binder electrodes in different electrolytes, cyclic voltammetry (CV), and impedance spectroscopy in a three-electrode cell was performed. In addition, galvanostatic charging and discharging were investigated in a two-electrode cell, where both, the anode and cathode constituted by carbon aerogel electrodes.
The relationship between the structure and the electrochemical performance of the carbon aerogel binder systems is discussed.