All‐Printed Green Micro‐Supercapacitors Based on a Natural‐derived Ionic Liquid for Flexible Transient Electronics. (6th May 2021) - Migliorini, Lorenzo
Abstract: The fabrication and characterization of green, flexible, and ultra‐thin supercapacitors that are able to operate above 1.5 V is reported, using an all‐printed fabrication process. The devices are produced by aqueous spray casting of a natural‐derived electrolyte ionogel composed by 2‐hydroxyethyl cellulose and by the ionic liquid choline lactate, while the electrodes are composed of highly porous nanostructured carbon films deposited by supersonic cluster beam deposition (SCBD). The obtained supercapacitors (device thickness < 10 μm) are stable to bending and they possess power values up to 120 kW kg –1 . The combination of aqueous spray casting and SCBD constitutes a versatile, scalable, and eco‐friendly fabrication process able to directly print interconnected elements suitable for transient electronic systems. Abstract : This work reports on the design of green, flexible, and ultra‐thin micro‐supercapacitors able to operate above 1.5 V. An eco‐friendly and all‐printed fabrication process is employed, based on the spray casting of a natural‐derived cellulose ionogel and the supersonic cluster beam deposition of highly porous carbon electrodes. The energetic performances are on the edge of the state‐of‐the‐art biodegradable supercapacitors.