CNTs mediated electrochemical performance and dielectric dispersion of TiO2-based hydrothermally synthesized nanocomposites

Here, we report CNTs-TiO2 nanocomposites synthesized using the hydrothermal technique to investigate their potential utilization in energy storage devices. Different weight percentages (0.3, 0.5, and 0.7 wt.%) of CNTs are added in TiO2 nanoparticles to tune their energy storage capacity. Structural analysis reveals the tetragonal crystal symmetry of TiO2 nanoparticles. Morphological investigations expose that the average particle size of TiO2 is 27 nm whereas the average diameter of CNTs is similar to 20 nm. Cyclic voltammetry confirms that the specific capacitance of CNTs-TiO2 nanocomposites increases from 149.5 to 367.1 mF/g with increasing concentration of CNTs. However, maximum power density is noticed for nanocomposites with 0.5 wt.% of CNTs. The value of specific capacitance and power density is noticed as 335 mF/g and 400.90 Wkg(-1), respectively. In addition, dispersion in dielectric behavior, variation in impedance response, and the presence of relaxation phenomenon are elaborated in a vast frequency range.

Automated summary

CNTs-TiO2 nanocomposites were synthesized using the hydrothermal technique. Structural and morphological analyses showed that the addition of CNTs can enhance the energy storage capacity of the nanocomposites, with the best performance observed at 0.5wt.% of CNTs.