In the present work, a simple cost-effective method of synthesis of composite PEDOT/MnO2 with dispersed manganese oxide particles was investigated. The composites were obtained by spontaneous reduction of permanganate ions in contact with PEDOT film. The morphology of highly dispersed manganese oxide in PEDOT film was characterized by SEM. XPS spectroscopy was employed for identification of valence states of manganese in composites at different oxidation states. FTIR spectra also confirm the presence of MnO2 in the composite. Electrochemical properties of composites, obtained with variation of synthesis conditions, were investigated using cyclic voltammetry and electrochemical impedance spectroscopy. The capacitive parameters of composites with different ratio between PEDOT and MnO2 layers were systematically investigated and analyzed. The enhanced capacitive properties of composites can be mainly attributed to 3-D distribution of disperse MnO2 in the porous structure of PEDOT film with high surface area. Th