Carbon Vacancy Mediated Incorporation of Ti3C2 Quantum Dots in a 3D Inverse Opal g-C3N4 Schottky Junction Catalyst for Photocatalytic H2O2 Production

Photocatalytic H 2 O 2 production is an environmentally friendly and sustainable production technique. Here, we fabricate the Ti 3 C 2 quantum dot-modified defective inverse opal g-C 3 N 4 (TC/CN) via a facile electrostatic self-assembly method. The resultant catalysts greatly facilitate the photocatalytic H 2 O 2 production. The optimum H 2 O 2 yield on TC/CN-20 reaches 560.7 μmol L –1 h –1, which is 9.3 times higher than that of bulk CN under visible light irradiation. This enhancement is attributed to the direction-induced bonding between carbon vacancies in g-C 3 N 4 and TCQDs. The formation of a Schottky junction in the interface further realizes spatial separation of electron and holes, effectively avoiding the recombination of the charge carriers at defect sites. Therefore, this work not only constructs a high-performance photocatalyst for H 2 O 2 production with outstanding yield and long-term recyclability but also develops a direction-induced bonding synthetic method and explores the functionary mechanism of defect sites in the Schottky junction for photocatalytic H 2 O 2 production.