Berlin 2008 – scientific programme
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MM: Fachverband Metall- und Materialphysik
MM 23: Poster session
MM 23.17: Poster
Tuesday, February 26, 2008, 14:45–18:00, Poster B
Hybrid electrode of carbon aerogels and metal oxides for electrochemical capacitors — •Volker Lorrmann1, Henning Lorrmann1, Ingo Riedel1, Gudrun Reichenauer1, Matthias Wiener1, Carsten Deibel2, and Vladimir Dyakonov1,2 — 1Bavarian Center of Applied Energy Research (ZAE Bayern), Functional Materials for Energy Technology, Am Hubland, D-97074 Würzburg, Germany — 2Lehrstuhl für Experimentelle Physik VI, Julius-Maximilian University of Würzburg, Am Hubland, D-97074 Würzburg
Electrochemical capacitors (EC) fill the gap between conventional capacitors with high power but low energy density and batteries with high specific energy density but rather low power density. There are two types of EC: Double-layer supercapacitors, which store charges electrostatically in the electrochemical double-layer between electrolyte and high surface area electrodes of activated hard carbon. In pseudocapacitance supercapacitors the charge storage is of faradaic-nature, e.g. redox processes in metal oxides. We have blended the organic precursor of a synthetic activated hard carbon (carbon aerogel) with metal oxide particles to be used as electrode for EC. The aim is to combine the faradaic- and the double-layer capacitance of the metal oxide and carbon, respectively, to increase the achievable capacity of the electrode. The electrochemical properties of these composites were investigated with cycling voltammetry, charge/discharge cycling and impedance spectroscopy. Structural analysis was performed via scanning electron microscopy and X-ray diffraction.