Efficient photocatalytic hydrogen peroxide production induced by the strong internal electric field of all-organic S-scheme heterojunction

Light-driven reaction of oxygen and water to hydrogen peroxide (H2O2) is an environmental protection method, which can convert solar energy into green products. In this work, perylene-3, 4, 9, 10-tetracarboxylic diimide (PDINH) could be recrystallized in situ on the surface of porous carbon nitride (PCN), to obtain an all-organic S-scheme heterojunction (PDINH/PCN). The design of the hierarchical por-ous photocatalyst improved the mass transfer, enhanced the light absorption and increased specific sur-face area. Moreover, the construction of the S-scheme heterojunction at the interface of PDINH and PCN exhibited suitable band, which facilitated the separation and transfer of carriers. The H2O2 production rate was up to 922.4 lmol g-1h-1, which was 2.6 and 53.3 times higher than that of PCN and PDINH. Therefore, the all-organic S-scheme heterojunction provides an insight for improving the photocatalytic H2O2 production.(c) 2022 Published by Elsevier Inc.

Automated summary

In this study, an all-organic S-scheme heterojunction (PDINH/PCN) was obtained by in situ recrystallization of perylene-3, 4, 9, 10-tetracarboxylic diimide (PDINH) on the surface of porous carbon nitride (PCN). This structure enables the light-driven reaction of oxygen and water to produce hydrogen peroxide (H2O2), converting solar energy into green products. The design of a hierarchical porous photocatalyst improved mass transfer, enhanced light absorption, and increased specific surface area. The S-scheme heterojunction formed at the interface of PDINH and PCN facilitated carrier separation and transfer. The H2O2 production rate reached 922.4 lmol g-1h-1, which was 2.6 and 53.3 times higher than that of PCN and PDINH, respectively. Therefore, the all-organic S-scheme heterojunction provides insight for enhancing photocatalytic H2O2 production.