Simultaneously improving O2 adsorption and activation for H2O2 photogeneration on K-doped-carbon nitride.

O₂ adsorption and activation are important factors in H₂O₂ production. Here, polymeric carbon nitride (PCN) with K was prepared using a hydrothermal method. Modified PCN with strong Lewis acidic–basic sites is favorable for O₂ adsorption and activation from air, and could quickly supplement the oxygen adsorbed from the air for the production of a high H₂O₂ yield (2102.11 μmol g⁻¹), and the yield is 42 times higher than that of pristine PCN in the atmosphere. The apparent quantum yields (AQYs) are 3.87% and 2.62% at 385 and 420 nm in the atmosphere, respectively. [ABSTRACT FROM AUTHOR]