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Springer Science and Business Media LLC Nature Communications 15(1)
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    초록·키워드

    Single-atom catalysts, especially those with metal-N<sub>4</sub> moieties, hold great promise for facilitating the oxygen reduction reaction. However, the symmetrical distribution of electrons within the metal-N<sub>4</sub> moiety results in unsatisfactory adsorption strength of intermediates, thereby limiting their performance improvements. Herein, we present atomically coordination-regulated Co single-atom catalysts that comprise a symmetry-broken Cl-Co-N<sub>4</sub> moiety, which serves to break the symmetrical electron distribution. In situ characterizations reveal the dynamic evolution of the symmetry-broken Cl-Co-N<sub>4</sub> moiety into a coordination-reduced Cl-Co-N<sub>2</sub> structure, effectively optimizing the 3d electron filling of Co sites toward a reduced d-band electron occupancy (d<sup>5.8</sup> → d<sup>5.28</sup>) under reaction conditions for a fast four-electron oxygen reduction reaction process. As a result, the coordination-regulated Co single-atom catalysts deliver a large half-potential of 0.93 V and a mass activity of 5480 A g<sub>metal</sub><sup>-1</sup>. Importantly, a Zn-air battery using the coordination-regulated Co single-atom catalysts as the cathode also exhibits a large power density and excellent stability.

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