Recent Progress on Graphitic Carbon Nitride–Based Photocatalysts for Hydrogen Peroxide Synthesis

ABSTRACT Hydrogen peroxide (H 2 O 2 ) is an indispensable chemical that is used in many industries. Artificial photosynthesis of H 2 O 2 from oxygen and water has obtained worldwide attention due to the merits of low‐cost and sustainability. Graphitic carbon nitride (g‐C 3 N 4 )‐based semiconductors are one of the most popular photocatalysts for H 2 O 2 synthesis due to the advanced intrinsic properties of g‐C 3 N 4 . To realize efficient H 2 O 2 photosynthesis, multiple strategies have been proposed for boosting the photocatalytic activity of g‐C 3 N 4 . Herein, we summarize the rapid progress of H 2 O 2 synthesis over g‐C 3 N 4 ‐based photocatalysts in the last several years. The review begins with a brief introduction of H 2 O 2 synthesis and g‐C 3 N 4 ‐based photocatalysts, followed by the principle for photocatalytic H 2 O 2 synthesis. Then, a series of common modification methods for preparing advanced g‐C 3 N 4 ‐based photocatalysts are systematically introduced and discussed, including heteroatom doping, defect engineering, junction construction, metal cocatalyst loading, single atom loading, functionalization, and other strategies. Finally, the prospects and challenges for future development are discussed.