The availability of efficient, low-cost and durable oxygen electrocatalyst for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) is the prerequisites for large-scale, practical application of rechargeable zinc (Zn)-air batteries. Thus, stable electrocatalysts with high oxygen electrocatalytic activity are in highly demand. Low-cost and metal-free carbon-based bifunctional oxygen electrocatalysts are regarded as promising alternatives to the commercially used noble metals which suffer from multiple drawbacks, including poor stability, high cost and susceptibility to methanol. Here, a facile and scalable strategy was introduced to fabricate porous carbon matrix doped with high content of active nitrogen species as efficient bifunctional oxygen electrocatalyst for superior Zn-air battery. Notably, the obtained electrocatalysts exhibit an ultrahigh surface area of 1200.3 m² g^-1 and abundant defects, both of which are capable to facilitate the accessibility and formation of catalytic sites. The as-fabricated Zn-air batteries achieve significantly large peak power density of ∼ 160 mW cm^-3 and excellent cycling performance (nearly 1000 cycles) with small voltage gap of 0.97 V. This research opens novel avenue for the design and fabrication of affordable high-performance oxygen electrocatalyst and durable energy storage systems.

高效，低成本和耐用的氧气还原反应（ORR）和氧气释放反应（OER）的氧气电催化剂的可用性是可再充电锌（Zn）-空气电池大规模实际应用的先决条件。因此，非常需要具有高氧电催化活性的稳定的电催化剂。低成本且不含金属的碳基双功能氧电催化剂被认为是市售贵金属的有前途的替代品，这些贵金属具有多种缺点，包括稳定性差，成本高以及对甲醇的敏感性。在这里，引入了一种简便且可扩展的策略来制造掺杂有高含量活性氮的多孔碳基体，作为用于优质Zn-空气电池的高效双功能氧电催化剂。尤其，² g ^-1和大量缺陷，两者均能够促进可及性和催化部位的形成。制成的Zn-air电池可实现约160 mW cm ^-3的大峰值功率密度和出色的循环性能（近1000个循环），且电压间隙为0.97V。该研究为可负担得起的设计和制造开辟了新途径高性能氧气电催化剂和耐用的储能系统。