Design,Preparation And Properties Of Flexible Stretchable And Self-healing Supercapacitors

With the rapid development of wearable and portable electronic devices,research on flexible supercapacitors is particularly important.Apart from high specific capacitance,high tensile ability and self-healing ability are also essential to improve the practicability and reliability of supercapacitors in portable and wearable electronics.For stretchable supercapacitors,self-healing ability is especially significant to restore their mechanical integrity,electrical conductivity and electrochemical performance when the damages occur under bending or stretchable deformations.However,the integration of multifunctions into one device still remains great challenging.Facing with these challenges,hydrogels,good reservoirs for both electrolyte and electrode,have the advantages in construction of stretchable and self-healable supercapacitor on the basis of interconnected network structure,high hydrophilicity,multifunctionality and easy processability,based on previous studies,a clever methods of preparation were designed in this paper,and a new types of hydrogels,which are polyacrylamide/gold nanoparticle/carbon nanotubes/polypyrrole nanocomposite hydrogel with high toughness,high conductivity performance and a stretchable,self-heaing flexible supercapacitor were successfully constructed by using the above methods Specifically,the main contents of this paper are as follows:1?In this work,a kind of highly robust and multiresponsive healing GCP@PPy hydrogel electrode has been developed with hierarchical honeycomb network structure through the growth of PPy nanoparticles into GCP framework.The electrode chemically crosslinked with gold nanoparticles delivers large stretchability with an elongation of2380%and because of the dynamic interaction of the gold-sulfhydryl coordination bond,The polymer chain can be recombined under the stimulation of NIR and current to achieve self-healing effect,and the optimal healing efficiency is 94%.2?In this work,a stretchable and real-time omni-healable all-gel-state supercapacitor device is assembled by sandwiching multifunctional GCP@PPy electrodes with GP hydrogel electrolyte and then chemically soldering a layer of AgNW film as current collector through the combined spray-coating method and NIR laser irradiation,which shows a record-breaking areal capacitance of 885 mF/cm~2 and energy density of 123?Wh/cm~2 among all the reported stretchable supercapacitors.Owing to intrinsic stretchability and healing ability of the electrode and electrolyte as well as the M(Au,Ag)-SR bonding-induced integrated configuration,the assembled device exhibits high capacitive stability with 89.5%of the initial value restored at a superhigh device-level strain of 800%and under NIR healing conditions,excellent capacitance performance is maintained after 10 healing cycles..Impressively,the maximum 92%of specific capacitance is restored during charge-discharge process.These merits validate it as the top performer among multifunctional supercapacitors,promising great application potentials in the fields of flexible electronic devices.