Polymer gel electrolytes based on PMMA were prepared by in situ polymerisation of methylmethacrylate, where solutions of inorganic and/or organic compounds in propylene carbonate can be used as an optional part incorporated in the gel. These elastic materials have suitable conductivity ca. 10(-3) to 10(-4) S cm(-1), high optical transmittance and these properties are stable for weeks. Gels with lithium perchlorate and ferrocene-ferricinium redox couple were studied using impedance spectroscopy and cyclic voltammetry. The behaviour of glassy carbon in contact with the gels was studied by cyclic voltammetry and impedance spectroscopy. (c) 2005 Elsevier B.V. All rights reserved.