# name
Characterization of CNTs and CNTs/MnO2 composite for supercapacitor application

# metadata.dc.description.abstract[].value
Manganese oxide (MnO2) was deposited on
multiwalled carbon nanotubes (MWCNTs) via electrochemical
deposition technique. Morphological and structural
characterizations were examined using Scanning Electron
Microscopy (SEM), Transmission Electron Microscopy (TEM)
and Raman Spectroscopy. Cyclic voltammetry and
Galvanostatic charge-discharge measurements were
performed to study the electrochemical properties.
0.2 M Na2SO4 was used as an electrolyte for both experiments.
For the purpose of the comparison, CNTs with different
morphologies and water plasma treatment times were
produced and optimized according to their capacitance
performance. Results show that vertically aligned CNTs have
improved capacitive performance than random aligned ones
and that water plasma treatment cleans the amorphous
carbon between nanotubes and increase the capacitance of
CNTs from 0.19 to 1 mFcm-2. Finally, addition of 2-3 nm
MnO2 layer on CNTs improve the capacitance significanltly
from 1 to 4.5 mFcm-2 (465 Fg-1). Therefore, results
demonstrate that MnO2/MWCNT composite is a promising
material to use as an electrode in supercapacitors.

# metadata.dc.source[].value
Màster Oficial - Nanociència i Nanotecnologia

# metadata.dc.title[].value
Characterization of CNTs and CNTs/MnO2 composite for supercapacitor application