Simple synthesis of multifunctional electrocatalysts with plentiful active sites from earth-abundant materials is especially fascinating. Here, N-doped defective carbon with trace Co (1.5 wt%) was prepared via a scalable one pot solid pyrolysis process. The sample exhibits efficient bifunctional OER/ORR activity in alkaline, mainly ascribed to the unique micro-mesoporous structure (1–3 nm), high population of graphitic-N doping (up to 49.0%), abundant defects and the encapsulated Co nanoparticles with graphitized carbon. The according rechargeable liquid Zn-air batteries showed excellent performance (maximum power density of 154.0 mW cm⁻²; energy density of 773 Wh kg⁻¹ at 5 mA cm⁻² and charging-discharging cycling stability over 100 cycles). As a proof-of-concept, the flexible, rechargeable all-solid-state Zn-air batteries were constructed, and displayed a maximum power density as high as 45.9 mW cm⁻², among the top level of those reported previously.

从地球上丰富的材料中简单合成具有丰富活性位点的多功能电催化剂尤其令人着迷。在这里，通过可扩展的单锅固体热解工艺制备了含有痕量 Co (1.5 wt%) 的 N 掺杂缺陷碳。该样品在碱​​性条件下表现出高效的双功能 OER/ORR 活性，这主要归因于独特的微介孔结构（1-3 nm）、大量的石墨-N 掺杂（高达 49.0%）、丰富的缺陷和包封的 Co 纳米颗粒石墨化碳。相应的可充电液体锌空气电池表现出优异的性能（最大功率密度为 154.0 mW cm ^-2；能量密度为 773 Wh kg ^-1在 5 mA cm ^-2和超过 100 个循环的充放电循环稳定性）。作为概念验证，构建了柔性可充电全固态锌空气电池，并显示出高达 45.9 mW cm ^-2的最大功率密度，处于先前报道的最高水平。