Fabrication of carbon quantum dots modulated/polyindole(PIn/CDs) thin film by electrospray deposition for high-performance next-generation solid-state supercapacitor

A binder-free polyindole/carbon quantum dots (PIn/CDs) thin-film/layer electrode is synthesized by a hybridelectrospray method. The synthesized CDs and PIn/CDs samples are used for furthercharacterization. Owing to the synergistic consequence of PIn and CDs, PIn/CDs display outstanding electrochemicalassets and cyclability, whichare deserved from the presence of robust interactions amongst polymeric chains and CDs. Further, CDs offer an electron allocation pathway owing to their extraordinary electricconductivity and high specific surface area. In a 3 M KOH aqueous-electrolyte, the Qs of PCDs-2is394 C/g at 6 A/g, which is higher than other comparative electrodes. The PCDs-2 film shows excellent cyclicretention of 75% at 20 Ag � 1 up to 3000 cycles. The fabricated PIn/CDs-2//rGO asymmetric device shows the highest specific capacity of 54.5 C/g at 1 A/g with theenergy and power density of 15.9 Wh/kg and 955.6 W/kg. Theseresults demonstrate that PIn/CDs thin-film could be used as an efficient electrode for supercapacitor application.

Automated summary

A binder-free PIn/CDs thin-film/layer electrode was synthesized using a hybrid electrospray method. The PIn/CDs demonstrated excellent electrochemical properties and cyclability due to the synergistic effect of PIn and CDs. The CDs provided an electron allocation pathway and contributed to the high specific surface area of the electrode. The PIn/CDs thin-film showed superior performance as an efficient electrode for supercapacitor application.