High energy density hybrid supercapacitors based on graphitic carbon nitride modified BiFeO3 and biomass-derived activated carbon

Pecenek H., Dokan F. K., ÖNSES M. S., YILMAZ E., ŞAHMETLİOĞLU E.

JOURNAL OF ENERGY STORAGE, vol.64, 2023 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 64
  • Publication Date: 2023
  • Doi Number: 10.1016/j.est.2023.107075
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Compendex, INSPEC
  • Keywords: Hybrid supercapacitor, Battery-type supercapacitor, Perovskite oxides, Bismuth ferrite
  • Erciyes University Affiliated: Yes


One of the major challenges to the commercialization of supercapacitors (SCs) remains the low energy density, especially at high current densities. Electrode materials with a wide operating voltage and high capacitance are promising for addressing this challenge. Bismuth ferrite (BiFeO3) is utilized as a battery-type electrode which exhibits a wide voltage window and high specific capacitance by storing charge through reversible redox re-actions. In this study, bismuth ferrite functionalized with graphitic carbon nitride (g-C3N4) is synthesized by hydrothermal and ball milling techniques to form the cathode for hybrid SCs. As anode, biowaste-derived activated carbon is synthesized from orange peels via a sequential carbonization and activation process. The device exhibits a high specific capacitance of 330 F/g, excellent energy density of 244.8 Wh kg(-1) and power density of 1.155 kW kg(-1) at a current density of 1 A g(-1). An innovative pathway has been developed for designing and fabricating asymmetric supercapacitors with high energy density. The assembled device provides a high operating voltage window of 2.4 V, opening up new possibilities for high-voltage high performance energy storage devices.