Berlin 2008 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe
CPP: Fachverband Chemische Physik und Polymerphysik
CPP 8: POSTERS Dynamics and Diffusion
CPP 8.19: Poster
Montag, 25. Februar 2008, 16:45–19:00, Poster A
Charging dynamics of carbon nanotube forest electrodes — •Lars Pastewka1 and Michael Moseler1,2 — 1Fraunhofer Institut für Werkstoffmechanik, Wöhlerstraße 11, 79108 Freiburg, Germany — 2Freiburger Materialforschnungszentrum, Stefan-Meier-Straße 21, 79104 Freiburg, Germany
Efficient energy harvesting requires devices which are able to store large amounts of electrical energy in short times. In this context, electrostatic double-layer capacitors with nanostructured electrodes have been discussed. Here, we exemplarily analyse ion transport into carbon nanotube forest electrodes in order to extract response times and capacities using a multiscale modeling approach. Starting from a quantum mechanical treatment of the capacitance of single tubes we construct a molecular dynamics model for ion transport into these electrodes. Finally, a continuum transport equation is derived which reproduces the molecular dynamics results and can be used for investigating systems with realistic forest heights and electrode separations.