Photocatalytic Efficiency of g-C<sub>3</sub>N<sub>4</sub>/Graphene Nanocomposites in the Photo-Assisted Charging of the Li-Ion Oxygen Battery

Kaçar N., Çayirli M., Özden R. C., Lökçü E., Anik M.

ACS OMEGA, vol.8, no.48, pp.46227-46235, 2023 (SCI-Expanded, Scopus) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 8 Issue: 48
  • Publication Date: 2023
  • Doi Number: 10.1021/acsomega.3c07546
  • Journal Name: ACS OMEGA
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Directory of Open Access Journals
  • Page Numbers: pp.46227-46235
  • Eskisehir Osmangazi University Affiliated: Yes

Abstract

In this work, we aimed to synthesize an effective nano-composite photocatalyst for the photo-assisted charging of the Li-ion oxygen battery. Initially the graphene films were synthesized by chemical vapor deposition, and subsequently, g-C3N4/graphene nanocomposites were synthesized by thermal reduction as photocatalysts. FTIR spectra analysis showed that novel C=C bonds can form between g-C3N4 and graphene films during the synthesis process. The photocurrent measurements indicated that the presence of graphene considerably contributed to the visible light utilization and photocatalytic efficiency of g-C3N4. This contribution was also revealed by the UV-vis diffuse reflectance spectra measurements, which showed that the incremental addition of the graphene reduced the optical band gap of the nanocomposite incrementally. The photocatalyst performance of the g-C3N4/graphene nanocomposite was also observed in the photo-assisted charging tests of the Li-ion oxygen battery, and the presence of 2D graphene in the structure improved the effectiveness of g-C3N4 in the reduction of the charging potential, especially at high current densities.