Light‐Driven Schottky Effect to Optimize Pt Charge Transfer on Metal–Organic Frameworks for Efficient H ₂ O ₂ Activation

ABSTRACT

The suboptimal catalytic activity of nanozymes arising from inefficient electron transfer represents a major challenge in the field of biomimetic catalysis. In this work, inspired by the photo‐responsive nanozymes, Pt nanoparticles were loaded on ZIF‐8, MIL‐53, and UiO‐66 for efficient light‐enhanced peroxidase‐like activity. Results reveal that Pt@UiO‐66, with a moderate Schottky barrier height, exhibits the highest light‐enhanced H ₂ O ₂ activation efficiency. Specifically, a moderate Schottky barrier height facilitates the efficient transfer of photogenerated electrons from the MOFs to the Pt nanoparticles, while simultaneously inhibiting the back‐transfer of hot electrons from the Pt nanoparticles. As a result, the Pt@UiO‐66 exhibits the optimal electron–hole separation efficiency and the highest charge density on Pt, which improves the utilization efficiency of photogenerated electrons and thereby enhances the activation of H ₂ O ₂ . Ultimately, compared to dark conditions, Pt@UiO‐66 exhibits a notably lower limit of detection for perfluorodecanoic acid under light irradiation, providing new insights for developing colorimetric biosensors with higher sensitivity of Pt‐based catalysts.