supercapacitors, polypyrrole, metal oxide, double layer
The development of eco-friendly technologies such as hybrid vehicles requires more efficient high power energy storage materials, viz. supercapacitors. As reported in our previous work, the association of polypyrrole and carbon derivatives (modified graphene oxide sheets) characterizes a new and potential candidate for application in supercapacitors. In the same direction, the development of ternary composites of polypyrrole/ carbon nanotube/ titanium dioxide can be characterized as a simple and low cost system. The results indicate that incorporation of particles of titanium dioxide during chemical synthesis of polypyrrole (in the presence of multi walled carbon nanotubes) contributes with reduction in the resulting impedance and consequently with transport/ diffusion of ions. In this work, we report the synthesis and characterization of mixed structures of nanotubes of polypyrrole/ metal oxide nanoparticles/ carbon nanotubes applied as supercapacitors. Results of impedance, C-V and charging/discharging curves of nanotubes of polypyrrole and decorated with metal oxide nanoparticles indicated that the composites can be considered materials with superior electrical response as a result of strong association of pseudocapacitance of metal oxide particles with EDLC of carbon nanotubes and high surface area of conducting polymer nanotubes.