Preparation and characterization of ball milled titanium oxide/multi walled carbon nanotube nanocomposite for supercapacitor applications

In this work, titanium oxide nanoparticles (TiO₂ NPs) and TiO₂-Multi walled carbon nanotubes (MWCNTs) nanocomposites were prepared using the ball milling technique. The characterization of synthesized nanocomposite was done using X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray spectrometer (EDS), Raman spectroscopy, and transmission electron microscopy (TEM). Dielectric constant ε₁ (ω) and dielectric loss ε₂ (ω) were discussed in terms of the dielectric polarization process. The Ac conductivity was increased with increasing MWCNTs amount. The charge carrier transport mechanism was interpreted using the correlated barrier hopping model (CBH). The Impedance spectroscopy showed a non-Debye relaxation in the material. The specific capacitance was increased with increasing MWCNTs concentration. Based on these detailed results, the TiO₂-MWCNTs nanocomposites displayed higher specific capacitance than TiO₂. In addition, the control of the current density applied onto CV measurements and MWCNTs composition of the electrodes to enhance the capacitance will open up a new strategy for the high-performance supercapacitors.