Oxygenated monolayer carbon nitride for excellent photocatalytic hydrogen evolution and external quantum efficiency
Abstracts Oxygen modified monolayer g C3N4 materials (abbreviated as O g C3N4) with high crystallinity in a high yield are prepared via thermal oxidation. The partial oxygenation of g C3N4 was simultaneously achieved, providing the opportunity to collaboratively affect both structure and electron for photocatalytic hydrogen evolution. The O g C3N4 monolayer exhibited a production rate of ~44.37 mmol/g ~8874.7 mmol/h g) for hydrogen evolution leading to the highest external quantum efficiency (EQE) of 13.7% (at 420 nm) of the reported g C3N4 nanosheets in a 5 h duration under visible light irradiation. More promisingly, the photocatalytic reaction proceeded for more than 25 h without performance degradation.