Low-valence platinum single atoms in sulfur-containing covalent organic frameworks for photocatalytic hydrogen evolution
Liangjun Chen, Guinan Chen, Chengtao Gong, Yifei Zhang, Zhihao Xing, Jiahao Li, Guodong Xu, Gao Li, Yongwu Peng
Abstract
This study focuses on optimizing catalytic activity in photocatalytic hydrogen evolution reaction by precisely designing and modulating the electronic structure of metal single atoms. The catalyst, denoted as PtSA@S-TFPT, integrates low-valence platinum single atoms into sulfur-containing covalent organic frameworks. The robust asymmetric four-coordination between sulfur and platinum within the framework enables a high platinum loading of 12.1 wt%, resulting in efficient photocatalytic hydrogen production activity of 11.4 mmol g−1 h−1 and stable performance under visible light. These outcomes are attributed to a reduced hydrogen desorption barrier and enhanced photogenerated charge separation, as indicated by density functional theory calculations and dynamic carrier analysis. This work challenges traditional notions and opens an avenue for developing low-valence metal single atom-loaded covalent organic framework catalysts to advance photocatalytic hydrogen evolution. A sulfur-rich covalent organic framework with low-valence Pt single atom sites is reported for photocatalytic hydrogen evolution. The material was stable under reaction conditions due to reduced hydrogen desorption barriers and enhanced charge separation.