Synthesis of N-Doped Graphene Photo-Catalyst for Photo-Assisted Charging of Li-Ion Oxygen Battery

Date

2023-01-01

Author

Kaçar, Nilay
Lökçü, Ersu
Çayırlı, Meltem
Özden, Reşad Can
Coşkun, Şahin
Toparlı, Çiğdem
Çelikyürek,İbrahim
Anik, Mustafa

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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.

Subject Keywords

chemical vapor deposition, Li-Ion oxygen batteries, N-doped graphene, photo-catalyst, photo-charging

URI

https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85178945369&origin=inward
https://hdl.handle.net/11511/106488

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Department of Metallurgical and Materials Engineering, Article