All-Printed Green Micro-Supercapacitors Based on a Natural-derived Ionic Liquid for Flexible Transient Electronics |
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| Authors: | Lorenzo Migliorini Claudio Piazzoni Kaija Pohako-Esko Marta Di Girolamo Andrea Vitaloni Francesca Borghi Tommaso Santaniello Alvo Aabloo Paolo Milani |
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| Institution: | 1. Interdisciplinary Centre for Nanostructured Materials and Interfaces (CIMaINa), Department of Physics, University of Milan, Via Celoria 16, Milan, 20133 Italy;2. Institute of Technology, University of Tartu, Nooruse 1, Tartu, 50411 Estonia |
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| 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. |
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| Keywords: | cellulose choline lactate green supercapacitors printing technologies spray casting transient electronics |
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