Carbon-Quantum-Dots-Anchored Poly(aniline-co-indole) Composite Electrodes for High-Performance Supercapacitor Applications

Abstract

Supercapacitors have attracted extensive consideration due to their high power density and long cyclability. However, safety and flexibility have become tasks encountered by supercapacitors with the further increase in their demand. Herein, we report a carbon-quantum-dots-anchored poly(aniline-co-indole) (PAPI@CQDs) composite thin film fabricated by the hybrid electrospray deposition method. It was found that the PAPI@ CQDs composite film showed outstanding electrochemical performance with the highest specific capacity (C s ) of 185.1 C/g at 2 A/g with an excellent cyclability of 79.4% at 20 A/g after 10000 consecutive charge−discharge cycles. Finally, the proposed electrode can be used to fabricate a hybrid solid-state supercapacitor (PAPI@CQDs//rGO, where rGO = reduced graphene oxide). The fabricated PAPI@CQDs//rGO asymmetric supercapacitor (ASC) device showed the highest specific capacity of 84.2 C/g at 1 A/g with an ultrahigh energy and a power density of 26.22 Wh/kg and 1125 W/kg, respectively. The solid-state PAPI@ CQDs//rGO ASC device sustains outstanding cyclability, with a retention of 72.3% after 5000 cycles at 20 A/g. This study offers an effective tactic to attain conducting polymer-based composite electrodes for supercapacitors and extend their application in the field of flexible electronics.

Hydrotropically Engineered Polyindole-Encapsulated Flower Shape Nanostructured MoS2 Conductive Framework for Asymmetric Supercapacitors

“…This was also further complemented by the device, which kept the digital stopwatch working for at least 15 min, as evident in Figure 11, which also complements the electrochemical performance (charge storage). Also, previously, several demonstrations 54 with respect to their materials have been reported with illuminating LEDs, such as by Guo et al (2019), 55 where they fabricated poly(indole-6carboxylicacid) (PICA)/TiO2 nanocomposites as electrochromic asymmetric supercapacitors that were able to light up an LED up to 108 s.…”

Preparation of Positive and Negative Composite Electrode Materials for High-Performance Aqueous Asymmetric Supercapacitor by a Sequential Two-Step Reaction

“…If appropriate organic electrode materials with different types of doping are selected to assemble asymmetric devices, one electrode is p-doping while the other is n-doping, which could provide high energy density. − However, the electrical conductivity of redox-active organic compounds has been limited by the degree of doping, resulting in the inability to utilize those advantages fully. Therefore, researchers have primarily focused on attaching organic materials to highly conductive carbon-based materials, such as activated carbon, carbon nanotubes, , and graphene , via π–π stacking, hydrogen bonding, and other noncovalent interactions. , To further increase the energy density, these composite electrode materials are utilized in the assembly of asymmetric devices. − For example, Jiao et al assembled asymmetric supercapacitors by fabricating redox-active PPA/rGO and GH-DN for the positive and negative electrodes, respectively. Kandambeth et al synthesized redox COFs structures for the negative electrode and assembled asymmetric supercapacitors using RuO 2 as the positive electrode.…”