Indexed on: 15 Aug '18Published on: 15 Aug '18Published in: ChemSusChem
With the boom of flexible electronic products and wearable devices, flexible energy storage devices, e.g., supercapacitors with high performance, are attracting increasing interest. A flexible water-deactivated polyelectrolyte hydrogel electrolyte with good mechanical properties and high ionic conductivity was prepared using an anionic polymer CMC and a cationic monomer MAPTAC. It was then applied in a supercapacitor with flexible activated carbon electrodes. This flexible supercapacitor possesses a high operating voltage of 2.1 V due to the low electrochemical activity for water within the hydrogel as a result of 'molecular cages' effect and hydrophilic interactions between functional groups and surrounding water molecules. Furthermore, this supercapacitor exhibits good flexibility and tailorability. As the first example of water-deactivated polyelectrolyte hydrogel electrolytes in applications involving flexible high-voltage supercapacitors, this work provides a platform for the design of energy storage devices with high energy density for flexible and wearable electronic devices. © 2018 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.