In-situ grown N, S co-doped graphene on TiO2 fiber for artificial photosynthesis of H2O2 and mechanism study

Artificial photosynthesis offers a promising strategy for converting solar energy into environmental-friendly H 2 O 2 . Herein, robust photocatalytic H 2 O 2 production through dioxygen reduction is achieved, reaching a high H 2 O 2 yield of 873 μmol L −1 h −1 . The photocatalyst was prepared by in-situ chemical vapor deposition of N, S co-doped graphene on TiO 2 nanofibers. Thanks to the intimate interface with large area and Schottky junction, the H 2 O 2 yield of the composite can be increased by eight times than that of pristine TiO 2 . Experimental results and density functional theory calculations clarify that the strong synergistic effect between the doped N and S atoms provides abundant active sites to facilitate the electron transfer, promote the adsorption of O 2 molecules, and restrain the decomposition of formed H 2 O 2 by suppressing H 2 O 2 adsorption. This work not only provides a novel approach to build close contact between photocatalyst and co-catalyst, but also develops a highly efficient photocatalyst for H 2 O 2 production.