Fabrication of poly(vinyl alcohol)‐graphene quantum dots coated with poly(3,4‐ethylenedioxythiophene) for supercapacitor

Abstract

Conducting nanofiber composed of poly(vinyl alcohol) (PVA), graphene quantum dots (GQDs) and poly(3,4-ethylenedioxythiophene) (PEDOT) was prepared for symmetrical supercapacitor through electrospinning and electropolymerization techniques. The formation of PVA nanofibers with the addition of GQDs was excellently prepared with the average diameter of 55.66 6 27 nm. Field emission scanning electron microscopy images revealed that cauliflower-like structure of PEDOT was successfully coated on PVA-GQD electrospun nanofibers. PVA-GQD/PEDOT nanocomposite exhibited the highest specific capacitance of 291.86 F/g compared with PVA/ PEDOT (220.73 F/g) and PEDOT (161.48 F/g). PVA-GQD/PEDOT also demonstrated a high specific energy and specific power of 16.95 and 984.48 W/kg, respectively, at 2.0 A/g current density. PVA-GQD/PEDOT exhibited the lowest resistance of charge transfer (R ct ) and equivalent series resistance compared with PEDOT and PVA/PEDOT, indicating that the fast ion diffusion between the electrode and electrolyte interface. PVA-GQD/ PEDOT nanocomposite also showed an excellent stability with retention of 98% after 1000 cycles.

Graphene quantum dot based materials for sensing, bio-imaging and energy storage applications: a review

“…The maximum specic capacitance of 3632.0 F g À1 was reported for applications as an electrode for supercapacitors. Syed et al 185 has prepared PVA-GQDs/PEDOT nanocomposite and used as a supercapacitor electrode. PVA-GQDs/PEDOT nanocomposite electrode shows a higher current-potential reaction related to bare PEDOT and PVA/PEDOT due to the large surface area of GQDs.…”

Carbon-Based Quantum Dots for Supercapacitors: Recent Advances and Future Challenges

“…A core-shell structure that wraps GQDs using a PEDOT:PVA nanofiber was prepared using the electrospinning method. Using this method, the GQD particle size can be made smaller than the typical pristine size, thus being beneficial for supercapacitors [ 160 ].…”

Facile Electrodeposition of Poly(3,4-ethylenedioxythiophene) on Poly(vinyl alcohol) Nanofibers as the Positive Electrode for High-Performance Asymmetric Supercapacitor

“…Ragone plot (Figure 6b) of ASC PVA/PEDOT//rGO can deliver reasonably high specific energy of 21.25 Wh·kg −1 at a specific power of 335.51 W·kg −1 . Interestingly, the superior specific energy of ASC surpasses other PEDOT-based electrodes [4,27,[40][41][42]. This remarkable supercapacitor behavior is due to the high specific capacitance obtained from the discharged time and extended potential window [43].…”

“…Fourier transform infrared spectroscopy (FTIR) was employed to identify the functional groups and bonding configuration present [17] in PVA nanofibers, PVA/PEDOT nanofibers, GO and rGO. The FTIR spectrum of PVA nanofibers as depicted in Figure 3 shows the existence of symmetric stretching of C-H and stretching band of C-O group at absorption bands 2906 cm −1 and 1087 cm −1 , respectively [27]. The broad peak observed at 3284 cm −1 and peak at 1438 cm −1 are attributed to hydroxyl (O-H) group and C-OH stretching vibration in PVA structure, respectively.…”

“…Figure 2c represents the FESEM image of rGO which suggests the wrinkled and crumpled morphology can facilitate rapid ion diffusion and charge transfer at the electrode material [14,28]. Figure 2b) reveals that PEDOT was uniformly coated on the cross-linking morphology of PVA nanofibers without interfering the fibril-like structure of nanofibers [27]. Figure 2c represents the FESEM image of rGO which suggests the wrinkled and crumpled morphology can facilitate rapid ion diffusion and charge transfer at the electrode material [14,28].…”