Improvement of electrochemical double-layer capacitance by fast and clean oxygen plasma treatment on activated carbon as the electrode material from walnut shells

Cafer Saka*, Orhan Baytar, Yavuz Yardim, Ömer Şahin

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

33 Citations (Scopus)

Abstract

In this study, a simple, fast, and clean oxygen plasma method is presented to increase the surface area of activated carbon from walnut shells (WAC) and to connect functional groups containing oxygen to the carbon sample surface. X-ray photoelectron spectroscopy (XPS), nitrogen adsorption technique, Fourier-transform infrared spectroscopy (FTIR), X-Ray Diffraction (XRD), and scanning electron microscope (SEM) analyses to investigate the properties of the WAC and WACP are performed. Cyclic voltammetry(CV) and electrochemical impedance spectroscopy(EIS) measurements are used to investigate the capacitance properties of the supercapacitors. A significant increase in the surface area of the WAC was increased from 22 m2 g−1 to 78 m2 g−1 after oxygen plasma treatment. The specific capacitance was improved from 6.98 F g−1 to 76.89 F g−1 at 2.5 mV s−1. The devices with functionalized electrodes exhibited cyclic stability of 78% after 5000 cycles.

Original languageEnglish
Article number105848
JournalBiomass and Bioenergy
Volume143
DOIs
Publication statusPublished - Dec 2020
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2020 Elsevier Ltd

Keywords

  • Activated carbon
  • Electric double-layer capacitors
  • Plasma
  • Walnut shells

Fingerprint

Dive into the research topics of 'Improvement of electrochemical double-layer capacitance by fast and clean oxygen plasma treatment on activated carbon as the electrode material from walnut shells'. Together they form a unique fingerprint.

Cite this