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Oxygen-doped g-C 3 N 4 (CN) with carbon vacancies (O−CNC) was synthesized by microwave heating the mixture of melamine−cyanuric acid (MCA) supramolecular aggregates and oxalic acid for only 7 min. The as-synthesized O−CNC shows a mesoporous structure and exhibits a tunable band structure, optimized charge separation, and significantly enhanced twoelectron reduction for H 2 O 2 production. The photocatalytic H 2 O 2 production rate reaches 2008.4 μmol h −1 g −1 under simulated sunlight irradiation, which is more than 4 times higher than that of pristine bulk CN. The enhanced photocatalytic performance is attributed to the synergistic effects of the mesoporous structure with a large specific surface area, doped oxygen atoms, and carbon vacancies. These results have provided a facile and efficient way for realizing the practical application of CN in photocatalytic H 2 O 2 production. KEYWORDS: rapid microwave synthesis, mesoporous g-C 3 N 4 (CN), oxygen doping, carbon vacancies, photocatalytic H 2 O 2 production

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By processing animal feces, making a fuel cell cathode catalyst can be comparable with the Pt/C.

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