TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Support: The conductive transparent support in the cell is made of layer of glass or of plastic polymer coated with tin oxide doped with fluorine or indium tin oxide.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Compound: The organic compound is an organic dye. The dye is selected from complexes of polypyridinic compounds with transition metal, porphyrins, phthalocyanines, perylenes, naphthocyanines, chinones, cianines, chinoimmines and/or photosynthetic pigments.Preferred Solvent: The dye is dissolved in the solvent which is selected from alcohol, ketone, ether, nitrite, halogenated aliphatic hydrocarbon, aliphatic hydrocarbon, aromatic hydrocarbon, and/or esters.    TECHNOLOGY FOCUS - POLYMERS - Preferred Composition: The water based electrolyte gel comprises polymeric compound(s) and electrolyte solution(s) (6) containing iodine/iodide as redox electrolyte. The water based electrolyte gel comprises a polymer obtained by polymerization of acrylate and/or methacrylate monomer with cross-linking agent(s). The cross-linking agent is 1,4-butane diol diacrylate, ethylene glycol dimethacrylate, diethylene glycol dimethacrylate, triethylene glycol dimethacrylate. The acrylate and/or methacrylate monomer is of formula: (CH2=C(-R1)-C(=O)-)n-R2, wheren = greater than or equal to1;R1 = hydrogen, methyl, ethyl or propyl, and R2 is hydroxyl, amino or hydrocarbon group containing 1 or more hydroxyl, carboxyl, carbonyl, amino, amide, glycidyl, ether, nitric, cyanate, isocyanate, alkyl oxy and/or alkylene oxy.The water based electrolyte gel comprises a polymer obtained by aqueous solution of hydrophilic polymer. The hydrophilic polymer is selected from vinyl polymer, polysaccharides, polylactic acid and/or polyethylene glycol. The vinyl polymer is selected from polyvinyl alcohol, polyvinylpyrrolidone, polyacrylic acid and its salts, polyethylacrylic acid and its salts, polymethacrylic acid and its salts, polymethylvinyl ether and like polymers. The polysaccharides are selected from starch, cellulose, pectin, guar gum, alginates, carrageenan, xanthan and dextran. The hydrophilic polymer(s) is cross-linked with aldehyde or units containing glycidyl groups. The sealing agent used for cell is epoxy resin, sodium silicate, ionomer resins and/or aluminum foil laminated with polymer foil.