The aim of this work was the application of active carbon composites as electrode material for supercapacitors, We have produced and investigated composites from viscose cellulose fibers impregnated with novolak and resolic resins. Composition and porous structure of the composites were described and electrochemical properties determined by galvanostatic and potentiodynamic methods. Dependence of electrical capacitance on treatment procedure and some of the structural parameters was confirmed. The use of novolak resin for activation with carbon dioxide was more advantageous, Positive electrode revealed better performance in acidic conditions (185 F/g) while negative electrode in alkaline conditions (160 F/g). (C) 2002 Elsevier Science B.V. All rights reserved.