Abundant Edge Active Sites‐Modified High‐Crystalline g‐C3N5 for Hydrogen Peroxide Production from Pure‐Water via a Quasi‐Homogeneous Photocatalytic Process

Abstract Ultrathin carbon nitride pioneered a paradigm that facilitates effective charge separation and acceleration of rapid charge migration. Nevertheless, the dissociation process confronts a disruption owing to the proclivity of carbon nitride to reaggregate, thereby impeding the optimal utilization of active sites. In response to this exigency, the adoption of a synthesis methodology featuring alkaline potassium salt‐assisted molten salt synthesis is advocated in this work, aiming to craft a nitrogenated graphitic carbon nitride (g‐C 3 N 5 ) photocatalyst characterized by thin layer and hydrophilicity, which not only amplifies the degree of crystallization of g‐C 3 N 5 but also introduces a plethora of abundant edge active sites, engendering a quasi‐homogeneous photocatalytic system. Under visible light irradiation, the ultra‐high H 2 O 2 production rate of this modified high‐crystalline g‐C 3 N 5 in pure water attains 151.14 µ m h −1 . This groundbreaking study offers a novel perspective for the innovative design of highly efficient photocatalysts with a quasi‐homogeneous photocatalytic system.