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Abstract Single‐atom catalysts have garnered significant attention due to their exceptional atom utilization and unique properties. However, the practical application of these catalysts is often impeded by challenges such as sintering‐induced instability and poisoning of isolated atoms due to strong gas adsorption. In this study, we employed the mechanochemical method to insert single Cu atoms into the subsurface of Fe 2 O 3 support. By manipulating the location of single atoms at the surface or subsurface, catalysts with distinct adsorption properties and reaction mechanisms can be achieved. It was observed that the subsurface Cu single atoms in Fe 2 O 3 remained isolated under both oxidation and reduction environments, whereas surface Cu single atoms on Fe 2 O 3 experienced sintering under reduction conditions. The unique properties of these subsurface single‐atom catalysts call for innovations and new understandings in catalyst design.
Guan et al. (Mon,) studied this question.