Improving the rate capability of microporous activated carbon-based supercapacitor electrodes using non-porous graphene oxide

GÜRTEN İNAL İ. I., Koyuncu F., Perez-Page M.

JOURNAL OF POROUS MATERIALS, cilt.30, sa.5, ss.1775-1787, 2023 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 30 Sayı: 5
  • Basım Tarihi: 2023
  • Doi Numarası: 10.1007/s10934-023-01459-7
  • Dergi Adı: JOURNAL OF POROUS MATERIALS
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Aerospace Database, Chimica, Communication Abstracts, Compendex, INSPEC, Metadex, Civil Engineering Abstracts
  • Sayfa Sayıları: ss.1775-1787
  • Anahtar Kelimeler: Activated carbon, Microporosity, Graphene oxide, Rate capability, Supercapacitor, OXYGEN FUNCTIONAL-GROUPS, SURFACE-AREA, ELECTROCHEMICAL PERFORMANCES, PORE-SIZE, CAPACITANCE, COMPOSITE, EDLC
  • Ankara Üniversitesi Adresli: Evet

Özet

In this work, high-rate-capability supercapacitor electrodes based on a green, sustainable, graphene oxide-assisted microporous activated carbon (AC) were developed by a facile method. Highly microporous ACs were produced from tea factory waste using different amounts of potassium carbonate (K2CO3). Non-porous GO sheets were prepared by anodic electrochemical exfoliation in a 0.1 M (NH4)(2)SO4 aqueous solution. The materials were characterized by N-2 adsorption-desorption, particle size, XPS, Raman, and SEM techniques. The electrochemical performance of ACs was examined by using a 6 M KOH electrolyte with CV, GCD, and EIS methods. It was determined that the activated carbon sample (AC-IR1.5), prepared using a mass ratio of (1.0:1.5) of tea factory waste: K2CO3, exhibited the best electrode performance. These highly reversible best-performing AC-based electrodes prepared from AC-IR1.5 with the highest micropore volume fraction were physically mixed with GO in mass ratios, (AC-IR1.5: GO) of 90:10, 75:25, 60:40, and examined as the supercapacitor electrodes along with AC-based electrodes. The electrochemical characterization results showed that a significant enhancement in the rate capability was achieved by AC-IR1.5: GO electrodes compared to AC-based ones. The capacitance retention of AC-IR1.5: GO (75:25) was found to be at least twice as higher (84%) than that of AC-based electrodes (39%) at a high current density of 10 A g(- 1).