Title :
Modeling carbon nanotube ultracapacitor
Author :
Orphanou, Antonis ; Yamada, Toshishige ; Yang, Cary Y.
Author_Institution :
Center for Nanostruct., Santa Clara Univ., Santa Clara, CA, USA
Abstract :
We report a study on modeling carbon nanotube (CNT) ultracapacitor performance, utilizing molecular dynamics to obtain solutions of Poisson´s equation within the capacitor cell. For a given voltage, the total current is computed based on the electric field generated from the nanotube electrodes and the friction caused by the motion of the electrolyte ions, yielding the frequency-dependent impedance. From the current and impedance behavior at a given frequency, we extract the Nyquist and Cyclic-Voltammetry plots for the simulated ultracapacitor. These plots compare well with existing experimental data. The behavior of the capacitor is further analyzed based on simulated spatial distributions of electrolyte ions.
Keywords :
Poisson equation; carbon nanotubes; electrolytes; supercapacitors; voltammetry (chemical analysis); Nyquist plot; Poisson equation; capacitor cell; carbon nanotube ultracapacitor; cyclic-voltammetry plot; electrolyte ions; frequency-dependent impedance; molecular dynamics; nanotube electrodes; Current measurement; Electrodes; Ions; Mathematical model; Supercapacitors; Voltage measurement; Cyclic Voltammetry plot; Nyquist plot; Ultracapacitor; carbon nanotube;
Conference_Titel :
Nanotechnology Materials and Devices Conference (NMDC), 2010 IEEE
Conference_Location :
Monterey, CA
Print_ISBN :
978-1-4244-8896-4
DOI :
10.1109/NMDC.2010.5652555
