Copper nanoparticles have been formed in ion exchange matrices KU-23 and MK-40 by chemical deposition. The size of the metal particles has been determined using scanning electron microscopy, X-ray powder analysis, and transmission electron microscopy. It has been found that the major contribution to the electrochemically active surface of the nanocomposite based on granular ion-exchange carrier make copper particles of a size of 37-47 nm regularly distributed on the bulk of the polymer. In electrode materials based on ion exchange membranes MK-40, copper nanoparticles on the surface are in general electrochemically active.