A self-healable and easily recyclable supramolecular hydrogel electrolyte for flexible supercapacitors

Abstract

A novel ferric ion cross-linked PAA supramolecular hydrogel electrolyte (Fe3+/PAA) with self-healing ability and easy-recyclability is fabricated and assembled with graphene foam supported polypyrrole electrodes (GF@PPy) to test its electrochemical performance.

Self‐Healing Materials for Next‐Generation Energy Harvesting and Storage Devices

“…Chemical structure of various polymers for the self-healing energy harvesting and storage devices. a) PVA: poly(vinyl alcohol) [99,127,128] , b) PAA: polyacrylic acid [71,80,97,98] , c) PDMS: polydimethylsiloxane [42,77,83] , d) PDMAA: poly(N,N-dimethylacrylamide) [51,52] , e) PMCMA-co-PCMA: poly[2-(ethylcarbamoyloxy)ethyl methacrylate-co-2-(ethylcarbamoyloxy)ethyl acrylate [56] ], f) PCL: polycaprolactone [69,75] , g) bPEI: branched polyethylenimine [62,71,80] , h) PU: polyurethane. [43,81,[91][92][93] www.advancedsciencenews.com Adv.…”

“…b) Self-healing of a dumbbell-shaped hydrogel at room temperature: i) the hydrogel after being cut, ii) the hydrogel after healing for 24 h. Reproduced with permission. [98] Copyright 2016, The Royal Society of Chemistry. c) Schematic illustration of the synthesis of self-healable PVA-g-PAA/KCl hydrogel electrolytes.…”

“…[98] The supramolecular hydrogel was physically cross-linked by the dynamic ionic bonding between ferric ion and carboxylic groups of PAA, as well as the intra-and intermolecular hydrogen bonding. The hydrogel containing KCl exhibited high ionic conductivity (0.09 S cm −1 ) and excellent mechanical performance (extensibility >700%, stress >400 kPa).…”

Smart Electrochemical Energy Storage Devices with Self‐Protection and Self‐Adaptation Abilities

“…Consequently, novel polymeric electrolytes which are intrinsically self-healable have been studied further. [100][101][102] Recently, Huang et al has reported a new self-healing electrolyte composed of polyacrylic acid and hybrid vinyl-silica nanoparticles (VSNPs-PAA) (Figure 5b). [103] The PAA polymer chains provided abundant reversible intermolecular hydrogen bonding, while the VSNPs reinforced the mechanical properties and covalently crosslinked the PAA polymer chains.…”

“…[100][101][102] Among these studies, efforts were mainly made concerning the recovery of electrode conductivities and integrity of the overall the configuration. Furthermore, the conventional PVA-based electrolytes with relatively low self-repair capability were frequently employed, which likely limited the overall self-healing performance of the corresponding supercapacitors.…”