Synthesis of Leaf-Vein-Like g-C3N4with Tunable Band Structures and Charge Transfer Properties for Selective Photocatalytic H2O2Evolution

Photocatalytic H(2)O(2)evolution through two-electron oxygen reduction has attracted wide attention as an environmentally friendly strategy compared with the traditional anthraquinone or electrocatalytic method. Herein, a biomimetic leaf-vein-like g-C(3)N(4)as an efficient photocatalyst for H(2)O(2)evolution is reported, which owns tenable band structure, optimized charge transfer, and selective two-electron O(2)reduction. The mechanism for the regulation of band structure and charge transfer is well studied by combining experiments and theoretical calculations. The H(2)O(2)yield of CN4 (287 mu mol h(-1)) is about 3.3 times higher than that of pristine CN (87 mu mol h(-1)), and the apparent quantum yield for H(2)O(2)evolution over CN4 reaches 27.8% at 420 nm, which is much higher than that for many other current photocatalysts. This work not only provides a novel strategy for the design of photocatalyst with excellent H(2)O(2)evolution efficiency, but also promotes deep understanding for the role of defect and doping sites on photocatalytic activity.