Berlin 2012 – scientific programme
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O: Fachverband Oberflächenphysik
O 58: Poster Session III (Solid/liquid interfaces; Metals; Semiconductors; Oxides and insulators)
O 58.6: Poster
Wednesday, March 28, 2012, 18:15–21:45, Poster B
Dilatation measurements of porous carbon electrodes during charging — •Anja Keckeisen1, Christian Weber1, Volker Lorrmann1, Gudrun Reichenauer1, and Jens Pflaum1,2 — 1Bavarian Center 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
Electrochemical double layer capacitors, also known as “supercapacitors“ are high power energy storage devices. Due to purely electrostatic charge storage, they achieve very long cycle lifetimes. A suited model system for investigating porous electrodes are carbon xerogels since their properties like particle size or micropore distribution can be tuned in a controlled fashion. We present a method to measure the length variation of supercapacitor carbon electrodes upon charging. While performing cyclic voltammetry measurements we observe changes of the electrode dimensions as a consequence of ion loading into the carbon micropores. By varying the ratio between pore and ion size as well as the particle size of the carbon xerogel backbone we can draw conclusions on the influence of the carbon structure on the charging process, which provides a microscopic model of charging with respect to anions and cations.