Photochemical tuning of dynamic defects for high-performance atomically dispersed catalysts

Developing active and stable atomically dispersed catalysts is challenging because of weak non-specific interactions between catalytically active metal atoms and supports. Here we demonstrate a general method for synthesizing atomically dispersed catalysts via photochemical defect tuning for controlling oxygen-vacancy dynamics, which can induce specific metal-support interactions. The developed synthesis method offers metal-dynamically stabilized atomic catalysts, and it can be applied to reducible metal oxides, including TiO₂, ZnO and CeO₂, containing various catalytically active transition metals, including Pt, Ir and Cu. The optimized Pt-DSA/TiO₂ shows unprecedentedly high photocatalytic hydrogen evolution activity, producing 164 mmol g^-1 h^-1 with a turnover frequency of 1.27 s^-1. Furthermore, it generates 42.2 mmol g_sub^-1 of hydrogen via a non-recyclable-plastic-photoreforming process, achieving a total conversion of 98%; this offers a promising solution for mitigating plastic waste and simultaneously producing valuable energy sources.