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After explorations in a diversity of single-atom nanozymes (SAzymes), developing dual-centered SAzymes becomes a promising approach for superior catalytic performance. But confusing mechanisms including atomic coordination, spatial configuration, and metal–metal atom interaction hinder the development and design of SAzymes. Herein, a dual-centered Fe-Cu-Nx SAzyme exhibits excellent peroxidase (POD)- and catalase (CAT)-like activities with d-band center (εd) coordination of Fe and Cu in multiple reaction stages, which plays a critical role in the adsorption of H2O2 molecule and H2O and O2 release. Therefore, the d-band center coordination, which can be represented by εd(Fe)–εd(Cu) shifts, leads to the competition between one-side and bilateral adsorption, which determines the favorable reaction path with lower energy barriers. Based on experimental statistics, simulated formation energies, and reaction barriers, 3 configurations, Fe-Cu-N6-I, Fe-Cu-N8-II, and Fe-Cu-N8-III, are modeled and validated. Impressively, configuration-dependent catalytic selectivity and the competition between one-side and bilateral adsorption can be unveiled by d-band center coordination paradigm analysis. Theoretical simulations suggest that the unsymmetrical charge distribution over the three Fe-Cu configurations could tune the adsorption strength compared with the counterparts FeN4 and CuN4. The present work provides a potential route for optimizing enzyme-like catalysis by designing the dual- or even triple-metal SAzymes, which demonstrates the large space to modulate the metal atomic configuration and interaction.
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