Hybrid electrodes composed of graphitic carbon nitride and zeolitic imidazolate framework-67 for supercapacitor applications

Yetiman S., KILIÇ DOKAN F., ÖNSES M. S., Yilmaz E., ŞAHMETLİOĞLU E.

INTERNATIONAL JOURNAL OF ENERGY RESEARCH, vol.46, no.15, pp.22730-22743, 2022 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 46 Issue: 15
  • Publication Date: 2022
  • Doi Number: 10.1002/er.8575
  • Journal Name: INTERNATIONAL JOURNAL OF ENERGY RESEARCH
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, PASCAL, Aerospace Database, Aquatic Science & Fisheries Abstracts (ASFA), Communication Abstracts, Compendex, Environment Index, INSPEC, Metadex, Pollution Abstracts, Civil Engineering Abstracts
  • Page Numbers: pp.22730-22743
  • Keywords: graphitic carbon nitride, supercapacitors, zeolitic imidazolate framework, ELECTROCHEMICAL PERFORMANCE, HIGH-ENERGY, GRAPHENE, NANOSHEETS, ZIF-67, NANOCOMPOSITE, NANOPARTICLES, FABRICATION, COPOLYMER, NITROGEN
  • Kayseri University Affiliated: Yes

Abstract

Carbon-based materials with porous and layered forms have irreplaceable worth in renewable energy storage applications, especially after the graphene discovery. Among these materials, graphitic carbon nitride (g-C3N4) shows great promise by including polymeric layers accentuate owing to its cost-effective yet eco-friendly chemistry. Zeolitic imidazolate frameworks (ZIFs) also draw attention to possessing high surface area owing to porous structure. Herein, we present a rational co-synthesis of these materials for the fabrication of high-performance supercapacitors (SCs). G-C3N4@ZIF-67 hybrid electrode demonstrated a high specific capacitance of 657 F g(-1) at the current density of 1 A g(-1). The specific capacitance of pure g-C3N4 and ZIF-67 were 446 and 560 F g(-1) at the same current density. Moreover, the capacitances only decay at 6%, 5%, and 10% after 3500 cycles for g-C3N4, ZIF-67, and g-C3N4@ZIF-67, respectively. The symmetric SC (g-C3N4@ZIF-67//g-C3N4@ZIF-67) also reached the highest specific capacitance of 144 F g(-1) at a current density of 0.5 A g(-1) and the degradation was 39% after 6000 cycles at a constant current density of 5 A g(-1). The presented SC exhibited a maximum energy density of 5.6 Wh kg(-1), whereas the power density was as high as 3783 W kg(-1). These results mark the obtained g-C3N4@ZIF-67 composite material as a promising electrode candidate for SCs.