A "Pre-Division Metal Clusters" Strategy to Mediate Efficient Dual-Active Sites ORR Catalyst for Ultralong Rechargeable Zn-Air Battery.

To conquer the bottleneck of sluggish kinetics in cathodic oxygen reduction reaction (ORR) of metal-air batteries, catalysts with dual-active centers have stood out. Here, a "pre-division metal clusters" strategy is firstly conceived to fabricate a N,S-dual doped honeycomb-like carbon matrix inlaid with CoN 4 sites and wrapped Co 2 P nanoclusters as dual-active centers (Co 2 P/CoN 4 @NSC-500). A crystalline {Co II 2 } coordination cluster divided by periphery second organic layers is well-designed to realize delocalized dispersion before calcination. The optimal Co 2 P/CoN 4 @NSC-500 executes excellent 4e - ORR activity surpassing the benchmark Pt/C. Theoretical calculation results reveal that the CoN 4 sites and Co 2 P nanoclusters can synergistically quicken the formation of *OOH on Co sites. The rechargeable Zn-air battery (ZAB) assembled by Co 2 P/CoN 4 @NSC-500 delivers ultralong cycling stability over 1742 hours (3484 cycles) under 5 mA cm -2 and can light up a 2.4 V LED bulb for ≈264 hours, evidencing the promising practical application potentials in portable devices.