Self-Floating Photocatalytic System for Highly Efficient Hydrogen Peroxide Production and Organic Synthesis on Carbon Dots Decorated Conjugated Microporous Polymer

Xueqing Li,?Guping Zhang,?Najun Li,?Qingfeng Xu,?Hua Li,?Jianmei Lu*（路建美）,?Dongyun Chen*（陳冬赟）

College of ChemistryChemical Engineering and Materials Science, Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow UniversitySuzhou, Jiangsu 215123, China

Adv. Funct. Mater. 2024 , 34, 2316773

Abstract: Photocatalytic oxygen (O2) reduction to hydrogen peroxide (H2O2) is considered to be a promising method for energy storage. However, it suffers from the rapid recombination of carriers, the limited solubility and slow diffusion of O2, and the self-decomposition of H2O2?in traditional diphase systems. Here, a self-floating carbon dots/conjugated microporous polymer (CDs/CMP) photocatalytic system is established for H2O2?production and organic synthesis. Due to the D–π–A structure, porous structure, and hydrophobicity, CMP induced the intramolecular charge transfer, exposed abundant reaction sites, and enhanced O2?adsorption. CDs act as “bridges” for electron transmission and regulate the surface hydrophobicity of CMP, further improving charge transfer and optimizing the reaction interface. CDs/CMP system exhibits a high H2O2?production of 8542.6?μmol?g?1?h?1?and concurrent furoic acid production at 2.22?mm?h?1. This H2O2?production rate is ≈90% higher than that in the diphase system, exceeding all previously reported photocatalysts in triphase systems. Notably, the CDs/CMP system achieves the relative separation of the photocatalysts and H2O2, suppressing the generated H2O2?self-decomposition. Theoretical calculations and in situ characterizations reveal the mechanism of H2O2?and furoic acid evolution. This self-floating system provides insights into exploring the application of metal-free photocatalysts in heterogeneous reactions.

鏈接：?https://onlinelibrary.wiley.com/doi/10.1002/adfm.202316773