Abstract
Herein, Cu single-atom-encapsulated hollow carbon-nitrogen spheres (CuSA@CNS) are fabricated through a solution process, confining optimal electronic structures reinforcing Cu-N4 active sites. CuSA@CNS demonstrate a remarkable half-wave potential of 0.95 V, mass activity, and a durability of 5000 cycles. Accordingly, CuSA@CNS present record-high power densities of 371 and 289 mW cm-2 for Zn- and Al-air batteries. The rechargeable Zn-air battery demonstrates an unprecedented small charge-discharge voltage and stable cycling for harsh operations at 50 mA cm-2, outperforming Pt/C.
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