In this work, new composite electrodes were developed and characterized for possible use in energy storage devices such as electrochemical capacitors (ECC). The electrodes were assembled using nanographite and, poly(3,4- ethylenedioxithiophene) (PEDOT) doped by polystyrenesulfonic acid (PSS), sodium dodecylsulfate (SDS), and dodecylbenzene sulfonic acid (DBSA). The electrodes presented conductivity in the order of X10-1 S cm-1 , which allowed the electrochemical deposition of PEDOT in aqueous medium. The composite electrodes were evaluated by cyclic voltammetry, impedance spectroscopy, galvanodynamic technique, and electron microscopy. The evaluation of the composite electrodes indicated improvements both in material properties and processability. For comparison purposes, a second set of composite electrodes was prepared. In this case, the chemically synthesized PEDOT was deposited by spray coating technique. The results from this comparison indicates that, is feasible to develop composite capacitors, by using the materials proposed in this thesis, due to the improvement of the electrochemical properties.