Patent ID: 8138713

Claim:
A solar cell comprising: a receive unit comprising a solar panel; an electrical energy storage device electrically connected in parallel with the receive unit; and a battery unit electrically connected in parallel with said electrical energy storage device; wherein the electrical storage device comprises a pair of electrode substrates ( 20 ) spacedly connected to each other by an insulated annular frame ( 30 ); a solid separator ( 40 ) disposed between the electrode substrates ( 20 ), preventing the electrode substrates ( 20 ) from touching one another; electrolyte ( 50 ) surrounding the separator ( 40 ) and contained between the electrode substrates ( 20 ); and oxide layers or mixed oxide layers ( 22 ) coated on the electrode substrates ( 20 ) in contact with the electrolyte ( 50 ), the oxide or mixed oxide layers ( 22 ) including at least one transition metal selected from the group consisting of platinum, palladium, ruthenium, iridium, rhodium and mixtures thereof.