The electrodes were laminated with heat-shrinkable foil with home ironing machine. Crystal Laminating Pouches 303 × 216 mm manufactured in China by ARGO S.A. (Poland) were applied for that purpose. The flexible TGP-H030 (30% wet proofing) carbon paper (TORAY Industries, Inc., Japan) served as an electrode material. Au 100-nm-thick film, with a 15-nm-thick underlayer of Ti, coated glass slides were prepared by the Institute of Electronic Materials Technology (Warsaw, Poland) and served as an electrical contact.