Quasifractal Networks as Current Collectors for Transparent Flexible Supercapacitors

A high performance, transparent, and simultaneously mechanically flexible supercapacitor, with electrodes based on a bio‐inspired, quasifractal metallic network is demonstrated. Excellent performance parameters, such as the specific capacitance of 5.6 mF cm−2 (at 45% transparency), great long‐term electrochemical and mechanical stability under stress, and low cost, make this one of the best reported, and most promising candidates for applications in the wearable, transparent integrated electronics. A transparent, flexible supercapacitor is assembled by sandwiching a gel electrolyte between two quasifractal Au leaf venation network electrodes, coated with polypyrrole. The supercapacitor areal capacitance of 5.6 mF cm−2, and 45% optical transparency rank among the best reported, and its superb stability and mechanical flexibilty promise successful application.