Hydrogen peroxide (H 2 O 2 ) can be considered as one of the world's indispensable chemicals. However, the synthetic process can prompt several severe environmental and human health issues. However, solar H 2 O 2 production may provide opportunities to mitigate such issues. Graphitic carbon nitride (g-C 3 N 4 ) has emerged as one promising material for photocatalytic applications due to its unique properties. Although tremendous efforts in engineering g-C 3 N 4 have been proposed to improve catalytic results, the materials obtained still have some issues.Additionally, the mechanisms behind the production of H 2 O 2 by using such materials are not yet fully understood. Herein, we conducted a literature survey reviewing the production of H 2 O 2 using g-C 3 N 4 -based materials. The essential aspects of and current challenges in photocatalytic H 2 O 2 generation are discussed, which may provide insight for researchers to overcome barriers and develop sustainable methods for H 2 O 2 production.

Hydrogen peroxide (H2O2) plays an essential role in many industrial fields and is globally listed as one of the indispensable chemicals. However, synthesizing H2O2 using the anthraquinone oxidation (AO) process requires multiple steps and releases hazardous organic compounds, which could seriously lead to many environmental and human health-related problems. Therefore, an urgent need for manufacturing H2O2 using green and sustainable methods to deal with the mentioned issues has enormously captured scientific interest. In this circumstance, the integration of piezo and photo effects on the generation of H2O2 from water and oxygen with the requirements of using low-cost and efficient catalytic materials is majorly considered. Herein, we report a simple and efficient way to produce H2O2 by employing modified graphitic carbon nitride (g-C3N4) catalysts to achieve the targets. The nanostructured materials were intensively characterized to deeply understand how the catalysts work to produce a significant amount of H2O2, reaching up to 1147.03 μM within 1 h irradiation. The findings showed that the fabrication of novel metal–carbon bonds and other functional groups could be responsible for adding more active sites in the system, promoting the enhancement of catalytic activities. This work would offer scientists a novel outlook to design and develop carbon-based materials for producing fine chemicals from catalysis and other applications.