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All‐Printed Green Micro‐Supercapacitors Based on a Natural‐derived Ionic Liquid for Flexible Transient Electronics
Author(s) -
Migliorini Lorenzo,
Piazzoni Claudio,
PohakoEsko Kaija,
Di Girolamo Marta,
Vitaloni Andrea,
Borghi Francesca,
Santaniello Tommaso,
Aabloo Alvo,
Milani Paolo
Publication year - 2021
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.202102180
Subject(s) - materials science , fabrication , supercapacitor , ionic liquid , nanotechnology , electrolyte , casting , electrode , composite material , electrochemistry , organic chemistry , medicine , chemistry , alternative medicine , pathology , catalysis
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.