| CPC H01G 11/36 (2013.01) [H01G 11/56 (2013.01); H01G 11/62 (2013.01); H01G 11/86 (2013.01)] | 25 Claims |

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1. A single symmetric supercapacitor device comprising:
two electrodes, wherein each electrode comprises a 3D foam material obtained by laser irradiating a carbon source; and
a hydrogel electrolyte enveloping the electrodes in an active area, wherein said hydrogel electrolyte comprises a mixture of a hydrogel and a salt;
and wherein the device has an operational voltage window that includes 2.6V.
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