As a promising strategy for the catalyst design and optimization, the biomimetic method can greatly improve the activity of oxygen redox catalysts. In this work, we construct a Ba_0.5Sr_0.5Co_0.8Fe_0.2O_3-δ (BSCF)-ceria (CeO₂) hybriding oxygen redox catalyst (BSCCF-NF-H) by imitating the structure and function of fish gills. In our BSCCF-NF-H catalyst, the perovskite nanofibers with the diameter of 200 nm prepared by electrospinning can imitate gill filaments to transfer oxygen species, while the CeO₂ nanoparticles uniformly growing on the surface of perovskite nanofibers by exsolution method can imitate lamellas to adsorb oxygen. Thanks to the biomimetic structure and function, BSCCF-NF-H shows the greatly enhanced catalytic activity toward both oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) comparing with the pristine BSCF. BSCCF-NF-H shows the low potential at 10 mA cm^-2 (E_j=10) of 1.62 V toward OER and half-wave potential (E_1/2) of 0.66 V toward ORR. Also, the bifunctional stabilities of BSCCF-NF-H are much higher than that of BSCF after the long-term durability tests. Benefiting from these advantages, BSCCF-NF-H is successfully applied as the bifunctional oxygen redox catalyst for aqueous and solid-state flexible zinc-air batteries (ZABs). Our work can provide an inspiring way for further explorations of high-performance perovskite oxygen redox catalyst.

作为催化剂设计和优化的一种有前景的策略，仿生方法可以大大提高氧氧化还原催化剂的活性。在这项工作中，我们通过模仿鱼鳃的结构和功能构建了 Ba _0.5 Sr _0.5 Co _0.8 Fe _0.2 O _3-δ (BSCF)-二氧化铈 (CeO ₂ ) 杂化氧氧化还原催化剂 (BSCCF-NF-H)。在我们的 BSCCF-NF-H 催化剂中，通过静电纺丝制备的直径为 200 nm 的钙钛矿纳米纤维可以模仿鳃丝转移氧物种，而 CeO ₂通过外溶法在钙钛矿纳米纤维表面均匀生长的纳米颗粒可以模仿薄片吸附氧气。由于具有仿生结构和功能，与原始 BSCF 相比，BSCCF-NF-H 对氧还原反应 (ORR) 和析氧反应 (OER) 的催化活性大大增强。BSCCF-NF-H 显示 10 mA cm ^-2 ( E _j=10 )的低电位为 1.62 V 朝向 OER 和半波电位 ( E _1/2) 0.66 V 朝向 ORR。此外，在长期耐久性测试后，BSCCF-NF-H 的双功能稳定性远高于 BSCF。受益于这些优势，BSCCF-NF-H 成功应用于水性和固态柔性锌空气电池 (ZAB) 的双功能氧氧化还原催化剂。我们的工作可以为进一步探索高性能钙钛矿氧氧化还原催化剂提供一种鼓舞人心的方式。