Regensburg 2010 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 61: Poster II: Materials, Interfaces and Heterostructures
HL 61.15: Poster
Thursday, March 25, 2010, 18:00–20:00, Poster D1
Relationship between structural properties and electrochemical characteristics of electrochemical double-layer electrodes in aqueous and organic electrolyte — •Volker Lorrmann1, Mario Zeller1, Gudrun Reichenauer1, Jens Pflaum1,2, and Vladimir Dyakonov1,2 — 1Bavarian Center of Applied Energy Research e.V. (ZAE Bayern), 97074 Würzburg — 2Experimental Physics VI, Julius-Maximillians-University of Würzburg, 97074 Würzburg
Electrochemical double-layer capacitors (EDLC) are energy storage devices with rather low energy density, but high power density. The charges are stored at the interface between the electrode and the electrolyte. The capacitance and the transport kinetics to the interfacial surface area strongly depend on the porous nanostructure of the electrodes. Carbon aerogels, based on sol-gel derived organic precursors, are promising candidates for EDLC electrodes because their nanostructure (e.g. pore- and particlesize) is tuneable over a wide range. For the same reason these materials also represent excellent model systems for the investigation of correlations between structural properties and electrochemical characteristics. We prepared carbon aerogel EDLC electrodes with a different nanostructures by varying the catalyst and reactant concentration in the starting solution. The structure of the carbon was characterised by nitrogen sorption and scanning electron microscopy. Electrochemical investigation was performed by cyclic voltammetry and impedance spectroscopy in aqueous and organic electrolytes. The relationship between the nanostructure and the electrochemical performance of the EDLC electrodes is discussed.