# Photoresponsive Adaptive Reconfiguration of Single‐Atom Interface With Intermittent Light and Soft Ionic Lattices

## TL;DR

This paper introduces a light-responsive catalyst system that uses halide perovskites to dynamically stabilize and reconfigure single-atom catalysts under intermittent light.

## Contribution

The novel approach integrates dynamic host chemistry, bandgap engineering, and light-regulated metal speciation for adaptive SAC stabilization.

## Key findings

- Light-induced bandgap funneling deposits atomic platinum under illumination.
- The dynamic interface prevents metal clustering during dark periods by refreshing the catalytic surface.
- The system sustains high activity in hydrogen halide splitting and hydrogen production over multiple cycles.

## Abstract

Achieving dynamic stability in single‐atom catalysts (SACs) is challenging, as it requires balancing strong metal‐support interactions with structural adaptability by incorporating flexibility into typically rigid SAC frameworks. Halide perovskites offer a unique platform for this purpose due to their soft ionic lattice and reversible dissolution–precipitation chemistry. We propose a concept for adaptively stabilizing SACs on halide perovskites through the integration of dynamic host chemistry, bandgap engineering, and light‐regulated metal speciation. A light‐induced bandgap funneling effect guides photogenerated carriers to deposit atomic platinum under illumination, while the dynamic interface prevents premature clustering during dark periods by refreshing the catalytic surface. The ionic, electronic, and atomic structural synergy enables a programmable intermittent illumination strategy, which drives continuous renewal of the interfacial atomic configuration and sustains high activity in hydrogen halide splitting and hydrogen production over multiple cycles. This work provides fundamental insights into adaptive catalytic interfaces and suggests new pathways for smart photocatalyst engineering via dynamic material‐light interplay.

We present a photoresponsive platform that integrates SACs with halide perovskite supports, turning perovskite ion mobility, typically a stability concern, into a functional mechanism for light‐regulated self‐repair and reversible atomic reconfiguration. Adaptive metal‐support interactions are established through bandgap‐funnel engineering and the soft ionic lattice under dynamic illumination.