Dual single-atom catalysts (DSACs) with maximized atomic utilization efficiency and high catalytic activity are attractive for electrocatalytic reactions. However, their catalytic performances largely depend on the surrounding micro-environment and the efficient support, which remain a challenging issue until now. Herein, the hollow fibers which are composed of the carbon nanobubbles with N, P heteroatom codopants and Fe-Co dual atomic sites are designed and realized. The Fe-Co dual atomic sites are anchored on the N, P codoped carbon bubbles to form the FeCoN₆-P-C (FeCo-NPC) configuration. The bubbles connect with each other and form the “bubble-in-rod” structure, appearing as the “BAH” fiber. The synergistic effect of Fe-Co dual centers and local electron engineering of P doping upgrade the adsorption/desorption features and boost the oxygen electrocatalytic reactions. Additionally, the highly porous and conductive framework boasts abundant active sites and thus enables the fast kinetics. Both theoretical and experimental results demonstrate the desired superior electrocatalytic activity with good stability towards the oxygen reduction/evolution reactions, which outperforms the reference samples of the counterpart catalyst without P dopant (FeCo-NC), the catalyst of single-atom Fe (Fe-NPC) and the catalyst of single-atomic Co based (Co-NPC) catalysts. On the basis of FeCo-NPC BAH cathode, the fabricated Zn-air battery achieves the high energy density and good cycling stability over 200 h. Moreover, the flexible solid-state ZAB with the polymer electrolyte and the 3D carbon matrix@Zn anode exhibits superior reliability, good durability and a wide range of adaptability over deformation and temperature. Therefore, this work not only paves a way for catalysts design, but also promotes the development of metal-air batteries for diverse electronics.

具有最大化原子利用效率和高催化活性的双单原子催化剂 (DSAC) 对于电催化反应具有吸引力。然而，它们的催化性能在很大程度上取决于周围的微环境和有效的支持，直到现在这仍然是一个具有挑战性的问题。在此，设计并实现了由具有N、P杂原子共掺杂和Fe-Co双原子位点的碳纳米气泡组成的中空纤维。Fe-Co 双原子位点固定在 N、P 共掺杂碳气泡上，形成 FeCoN ₆-PC（FeCo-NPC）配置。气泡相互连接形成“杆中气泡”结构，表现为“BAH”纤维。Fe-Co双中心的协同效应和P掺杂的局部电子工程提升了吸附/解吸特性，促进了氧电催化反应。此外，高度多孔和导电的框架拥有丰富的活性位点，因此能够实现快速动力学。理论和实验结果都证明了所需的优异电催化活性，对氧还原/放出反应具有良好的稳定性，优于不含磷掺杂剂的对应催化剂（FeCo-NC）的参考样品，单原子铁（Fe- NPC）和单原子钴基（Co-NPC）催化剂。在FeCo-NPC BAH正极的基础上，制造的锌空气电池在 200 小时内实现了高能量密度和良好的循环稳定性。此外，具有聚合物电解质和 3D 碳基体@Zn 负极的柔性固态 ZAB 表现出卓越的可靠性、良好的耐久性以及对变形和温度的广泛适应性。因此，这项工作不仅为催化剂设计铺平了道路，而且促进了用于各种电子产品的金属空气电池的发展。