CsPbBr₃ quantum dots-decorated porous covalent triazine frameworks nanocomposites for enhanced solar-driven H₂O₂ production

Hydrogen peroxide (H₂O₂) artificial photocatalysis technology promises a bright prospect in solving the burgeoning energy and environmental challenges. Covalent triazine frameworks (CTFs) is an exciting group of promising photocatalysts for H₂O₂ production. However, single CTF still suffers from unsatisfactory photocatalytic behavior primarily owing to the severe charge recombination and the lack of proficient dioxygen (O₂) adsorption/activation catalytic sites. Herein, porous CsPbBr₃ quantum dots (QDs)-decorated CTFs (CsPbBr₃/CTFs) nanocomposites were prepared through an in-situ composite method for robust photocatalytic H₂O₂ evolution from O₂ without using any sacrificial agents. The nanocomposites exhibit a significantly boosted performance toward photocatalytic H₂O₂ production compared with pristine CsPbBr₃ and CTFs. The reaction activity can reach a highest value of 134.6 μM h⁻¹, which is 13.3-times than that of the pristine CTFs. Additionally, the rationally designed porous CsPbBr₃/CTFs nanocomposites achieved a solar-to-chemical conversion efficiency of 0.14%, beyond most photocatalysts previously reported. The unique composite effect is key to synergistically enhance charge separation and achieve efficient H₂O₂ production. This work is anticipated to offer alternative avenues to exploit halide perovskite QDs and CTFs in various photocatalytic reactions.