Graphene quantum dots doped conducting polymer nanocomposite for high performance supercapacitor application
by M. Vandana; H. Vijeth; S.P. Ashokkumar; H. Devendrappa
International Journal of Nanotechnology (IJNT), Vol. 18, No. 5/6/7/8, 2021

Abstract: Water-dispersible graphene quantum dots are synthesised by the hydrothermal method. Graphene quantum dots polypyrrole nanocomposites (PGQDs) are prepared by the chemical oxidation polymerisation method. The properties of the composite were characterised by UV-Visible absorption spectra, transmission electron microscopy, and impedance spectroscopy (temperature from 300 K to 393 K, frequency 20 Hz−1 MHz). The dielectric and modulus parameters were studied and high conductivity of 1.62 S/Cm was observed. A solid-state supercapacitor with a simple structure is designed based on polymer quantum dots composite film using stainless steel electrodes with PVA/KOH gel electrolyte. The performance of the supercapacitor was analysed by using cyclic voltammetry (CV), galvanostatic charge-discharge curves (GCD), and electrochemical impedance spectra (EIS) and Nyquist plot. It was observed that PPY-GQDs supercapacitors exhibited a maximum specific capacitance of 790.3 F/g. The electrochemical properties of the supercapacitor with high flexibility and stability are enhanced by optimising the concentration of electrically conductive substances like polymer gel and an increase in the concentration of GQDs.

Online publication date: Mon, 12-Jul-2021

The full text of this article is only available to individual subscribers or to users at subscribing institutions.

 
Existing subscribers:
Go to Inderscience Online Journals to access the Full Text of this article.

Pay per view:
If you are not a subscriber and you just want to read the full contents of this article, buy online access here.

Complimentary Subscribers, Editors or Members of the Editorial Board of the International Journal of Nanotechnology (IJNT):
Login with your Inderscience username and password:

Username:        Password:          Forgotten your password?

Want to subscribe?
A subscription gives you complete access to all articles in the current issue, as well as to all articles in the previous three years (where applicable). See our Orders page to subscribe.

If you still need assistance, please email subs@inderscience.com