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    Photocatalytic Efficiency of g-C3N4/Graphene Nanocomposites in the Photo-Assisted Charging of the Li-Ion Oxygen Battery
    (Amer Chemical Soc, 2023) Kacar, Nilay; Cayirli, Meltem; Ozden, Resat Can; Lokcu, Ersu; Anik, Mustafa
    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.
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    Synthesis of N-Doped Graphene Photo-Catalyst for Photo-Assisted Charging of Li-Ion Oxygen Battery
    (Wiley-V C H Verlag Gmbh, 2024) Kacar, Nilay; Lokcu, Ersu; Cayirli, Meltem; Ozden, Resat Can; Coskun, Sahin; Toparli, Cigdem; Anik, Mustafa
    In this work, nitrogen (N)-doped graphene film is synthesized, as a photo-catalyst, on one side of the copper foam by chemical vapor deposition and the copper foam is directly used as an electrode after porous Pd@rGO cathode loading to the other side of the foam for the photo-assisted charging of the Li-ion oxygen battery. The amount of urea (CO(NH2)2), which is used as N atom source, is optimized to get maximum photo-anodic currents from the n-type graphene films. The optical band gap and the valance band edge potential of the optimized N-doped graphene film are determined as 2.00 eV and 3.71 VLi+/Li, respectively. X-ray photoelectron spectra provided that the atomic percent of N atoms in the graphene film is 1.34% and the graphitic, pyrrolic and pyridinic N atom percentages are 54.01%, 42.20% and 3.79%, respectively. The photo-assisted charging tests indicated that the N-doped graphene film photo-catalyst reduced the charging potential significantly even at 1000 mA g-1 (0.1 mA cm-2) current density and improved the cyclic discharge-charge performance of the Li-ion oxygen battery considerably. Nitrogen (N)-doped graphene film is synthesized as a photo-catalyst for the photo-assisted charging of the Li-ion oxygen battery. After structural and the optical characterizations, the effectiveness of the photo catalyst is determined by the charge/discharge tests that N-doped graphene film photo-catalyst reduced the charging potential and improved the cyclic performance of the Li-ion oxygen battery considerably.image