Effect of binder on the electrochemical performance of activated carbon electrodes obtained from waste hazelnut shells: Comparison of PTFE and PVDF

Ozpinar P., Dogan C., DEMİRAL H., MORALI U., EROL S., YILDIZ D., ...More

DIAMOND AND RELATED MATERIALS, vol.137, 2023 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 137
  • Publication Date: 2023
  • Doi Number: 10.1016/j.diamond.2023.110092
  • Journal Name: DIAMOND AND RELATED MATERIALS
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, PASCAL, Aerospace Database, Chemical Abstracts Core, Communication Abstracts, INSPEC, Metadex, Civil Engineering Abstracts
  • Keywords: Biomass, Activated carbon, Supercapacitor, Binder, PTFE, PVDF, SURFACE-AREA, REMOVAL, SPECTROSCOPY, CAPACITANCE, ADSORPTION, NANOTUBE, ZINC, LEAD
  • Eskisehir Osmangazi University Affiliated: Yes

Abstract

In this study, the electrochemical performance of the electrode materials based on two commonly used binders -poly(vinylidene difluoride) (PVDF) and poly(tetrafluoroethylene) (PTFE)- was introduced. The electrochemical performance of the activated carbon electrodes was explored by performing cyclic voltammetry, galvanostatic charge-discharge, and electrochemical impedance spectroscopy techniques. The results showed that the activated carbon electrode prepared at 500 degrees C with PTFE (AC-500-PTFE) exhibited higher capacitance values at low current rates than the one with PVDF (AC-500-PVDF). The results also revealed that the capacitance values of the AC-500-PVDF electrode for the current rates higher than 1.5 A g  1 were higher than the AC-500-PTFE electrode. The implemented transmission line equivalent circuit model for impedance showed that the capacitance inside the pores was higher for the AC-500-PVDF, and the higher capacitance on the electrode surface was obtained for the AC-500-PTFE. As a result, it is recommended to prefer PTFE binder for low current density, yet a PVDF binder for high current density applications.