Eventos Anais de eventos
COBEM 2017
24th ABCM International Congress of Mechanical Engineering
SYNTHESIS AND CHARACTERIZATION OF CNT-O 2 THIN FILMS AS DOUBLE LAYER CAPACITOR ELECTRODE
Submission Author:
Marina Borgert Moraes , SP
Co-Authors:
Marina Borgert Moraes, Gilmar Thim
Presenter: Marina Borgert Moraes
doi://10.26678/ABCM.COBEM2017.COB17-2921
Abstract
As the search for renewable energy sources rises, there’s also a growing need for more efficient energy storage devices, and researches on this field become more and more important. The use of innovative electrode materials seeks to improve energy density and lifetime span of such devices. In this context, nanomaterials, especially carbon nanotubes, appear very promising. This work focuses on the study of vertically aligned carbon nanotubes, treated by oxygen plasma, for utilization as an electrochemical capacitor electrode. Characterization analysis of the samples consisted of Raman spectroscopy and scanning electron microscopy images. To evaluate electric energy storage capacity and behavior, cyclic voltammetry, electrochemical impedance spectroscopy and charge/discharge routines were employed. Samples presented specific capacitance up to 192.71 F/g for voltammetry evaluation and a value of 201.23 F/g was obtained through discharge curves. For some samples, it was noted the contribution of pseudo-capacitance. From the Nyquist plot, it was possible to estimate electrolyte resistance, charge transfer resistance and double layer capacitance.
Keywords
carbon nanotubes, thin films, electrical double layer capacitors, energy storage
