Fabrication and characterization of poly(vinyl alcohol)- graphene quantum dot-cobalt oxide/poly(3,4- ethylenedioxythiophene) for high-performance supercapacitor

Fabrication and characterization of poly(vinyl alcohol)- graphene quantum dot-cobalt oxide/poly(3,4- ethylenedioxythiophene) for high-performance supercapacitor

Fabrication of highly conductive nanofiber by coating polyvinyl alcohol-graphene quantum dot-cobalt oxide (PVA-GQD-Co3O4) nanofiber composites with a conductive material, poly(3,4-ethylenedioxythiophene) (PEDOT) for symmetrical supercapacitor was prepared via two-step technique i.e. electrospinni...

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Main Author: Syed Zainol Abidin, Shariffah Nur Jannah
Format: Thesis
Language:English
Published: 2017
Subjects:
Supercapacitors
Polyvinyl alcohol
Online Access:http://psasir.upm.edu.my/id/eprint/68665/1/FS%202018%2014%20-%20IR.pdf
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spelling my-upm-ir.686652019-05-31T00:41:03Z Fabrication and characterization of poly(vinyl alcohol)- graphene quantum dot-cobalt oxide/poly(3,4- ethylenedioxythiophene) for high-performance supercapacitor 2017-12 Syed Zainol Abidin, Shariffah Nur Jannah Fabrication of highly conductive nanofiber by coating polyvinyl alcohol-graphene quantum dot-cobalt oxide (PVA-GQD-Co3O4) nanofiber composites with a conductive material, poly(3,4-ethylenedioxythiophene) (PEDOT) for symmetrical supercapacitor was prepared via two-step technique i.e. electrospinning and electropolymerization. The prepared electrode materials were characterized using Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy and X-ray diffraction (XRD) analysis to confirm the structure of the electrospun nanofiber composites. The presence of cauliflower-like structure studied by field emission scanning electron microscopy (FESEM) revealed that PEDOT was uniformly coated on PVA-GQD-Co3O4 electrospun nanofibers. The limited cycling stability of PEDOT, poor capacitance of GQDs and low conductivity of Co3O4, were overcome by forming the nanofiber composite. The electrochemical performance were investigated and evaluated by sandwiching a filter paper immersed in a sulphuric acid solution between two indium tin oxide (ITO) glass coated with the nanofiber composite. Owing to large surface area and better spacing of nanofiber network structures, PVA-GQD-Co3O4/PEDOT nanofiber composites exhibited the highest specific capacitance of 361.97 F/g compared to PEDOT (161.48 F/g), PVA/PEDOT (220.73 F/g) and PVA-GQD/PEDOT (291.86 F/g) nanofiber composites. PVA-GQD-Co3O4/PEDOT nanofiber composite also demonstrated a high specific energy and excellent specific power ranged from 16.51 to 19.98 Wh/kg and 496.10 to 2396.99 W/kg, as the current density increased from 1.0 to 5.0 A/g. In addition, the equivalent series resistance (ESR) for PVA-GQDCo3O4/ PEDOT (15.6 Ω) nanofiber composite exhibited the lowest value as compared to PEDOT (53.7 Ω), PVA/PEDOT (45.0 Ω) and PVA-GQD/PEDOT (41.9 Ω). Moreover, PVA-GQD-Co3O4/PEDOT nanofiber composite also showed an excellent stability with retention of 96% of its specific capacitance after 1000 cycles. Therefore, PVA-GQD-Co3O4/PEDOT nanofiber composite can be considered as a promising electrode material for application in supercapacitors. Supercapacitors Polyvinyl alcohol 2017-12 Thesis http://psasir.upm.edu.my/id/eprint/68665/ http://psasir.upm.edu.my/id/eprint/68665/1/FS%202018%2014%20-%20IR.pdf text en public masters Universiti Putra Malaysia Supercapacitors Polyvinyl alcohol
institution Universiti Putra Malaysia
collection PSAS Institutional Repository
language English
topic Supercapacitors
Polyvinyl alcohol
spellingShingle Supercapacitors
Polyvinyl alcohol

Syed Zainol Abidin, Shariffah Nur Jannah
Fabrication and characterization of poly(vinyl alcohol)- graphene quantum dot-cobalt oxide/poly(3,4- ethylenedioxythiophene) for high-performance supercapacitor
description Fabrication of highly conductive nanofiber by coating polyvinyl alcohol-graphene quantum dot-cobalt oxide (PVA-GQD-Co3O4) nanofiber composites with a conductive material, poly(3,4-ethylenedioxythiophene) (PEDOT) for symmetrical supercapacitor was prepared via two-step technique i.e. electrospinning and electropolymerization. The prepared electrode materials were characterized using Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy and X-ray diffraction (XRD) analysis to confirm the structure of the electrospun nanofiber composites. The presence of cauliflower-like structure studied by field emission scanning electron microscopy (FESEM) revealed that PEDOT was uniformly coated on PVA-GQD-Co3O4 electrospun nanofibers. The limited cycling stability of PEDOT, poor capacitance of GQDs and low conductivity of Co3O4, were overcome by forming the nanofiber composite. The electrochemical performance were investigated and evaluated by sandwiching a filter paper immersed in a sulphuric acid solution between two indium tin oxide (ITO) glass coated with the nanofiber composite. Owing to large surface area and better spacing of nanofiber network structures, PVA-GQD-Co3O4/PEDOT nanofiber composites exhibited the highest specific capacitance of 361.97 F/g compared to PEDOT (161.48 F/g), PVA/PEDOT (220.73 F/g) and PVA-GQD/PEDOT (291.86 F/g) nanofiber composites. PVA-GQD-Co3O4/PEDOT nanofiber composite also demonstrated a high specific energy and excellent specific power ranged from 16.51 to 19.98 Wh/kg and 496.10 to 2396.99 W/kg, as the current density increased from 1.0 to 5.0 A/g. In addition, the equivalent series resistance (ESR) for PVA-GQDCo3O4/ PEDOT (15.6 Ω) nanofiber composite exhibited the lowest value as compared to PEDOT (53.7 Ω), PVA/PEDOT (45.0 Ω) and PVA-GQD/PEDOT (41.9 Ω). Moreover, PVA-GQD-Co3O4/PEDOT nanofiber composite also showed an excellent stability with retention of 96% of its specific capacitance after 1000 cycles. Therefore, PVA-GQD-Co3O4/PEDOT nanofiber composite can be considered as a promising electrode material for application in supercapacitors.
format Thesis
qualification_level Master's degree
author Syed Zainol Abidin, Shariffah Nur Jannah
author_facet Syed Zainol Abidin, Shariffah Nur Jannah
author_sort Syed Zainol Abidin, Shariffah Nur Jannah
title Fabrication and characterization of poly(vinyl alcohol)- graphene quantum dot-cobalt oxide/poly(3,4- ethylenedioxythiophene) for high-performance supercapacitor
title_short Fabrication and characterization of poly(vinyl alcohol)- graphene quantum dot-cobalt oxide/poly(3,4- ethylenedioxythiophene) for high-performance supercapacitor
title_full Fabrication and characterization of poly(vinyl alcohol)- graphene quantum dot-cobalt oxide/poly(3,4- ethylenedioxythiophene) for high-performance supercapacitor
title_fullStr Fabrication and characterization of poly(vinyl alcohol)- graphene quantum dot-cobalt oxide/poly(3,4- ethylenedioxythiophene) for high-performance supercapacitor
title_full_unstemmed Fabrication and characterization of poly(vinyl alcohol)- graphene quantum dot-cobalt oxide/poly(3,4- ethylenedioxythiophene) for high-performance supercapacitor
title_sort fabrication and characterization of poly(vinyl alcohol)- graphene quantum dot-cobalt oxide/poly(3,4- ethylenedioxythiophene) for high-performance supercapacitor
granting_institution Universiti Putra Malaysia
publishDate 2017
url http://psasir.upm.edu.my/id/eprint/68665/1/FS%202018%2014%20-%20IR.pdf
_version_ 1747812615511343104

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