The strong desire for a clean and secure energy future has stimulated great interest in searching for low-cost, highly efficient electrocatalysts for regenerative fuel cells and rechargeable metal-air batteries. Oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) play a paramount role in the operation of these devices, but are notoriously sluggish even with precious metals-based catalysts. Here we report our findings in the development of a bifunctional catalyst based on phosphorus-doped LaFeO_3-δ for ORR and OER in alkaline solutions. The remarkable electrocatalytic performance is attributed to larger amount of O₂²⁻/O⁻ species, trace amount of Fe⁴⁺ species, and optimized e_g electron filling (≈ 1), benefiting from the doping effect of phosphorus. Both the mass activity and the specific activity are nearly doubled after P-doping. Density functional theory calculations also confirm that the increase in valence state of Fe ions is due mainly to phosphorus doping. These results demonstrate that non-metal element doping is an effective approach to optimizing the electronic configuration, changing valence states of ions, and thus enhancing activities of perovskite electrocatalysts.

对清洁和安全的能源未来的强烈渴望激发了人们对寻找低成本，高效的可再生燃料电池和可充电金属空气电池用电催化剂的兴趣。氧气还原反应（ORR）和氧气释放反应（OER）在这些设备的运行中起着至关重要的作用，但是众所周知，即使使用贵金属基催化剂，它们也反应迟钝。在这里，我们报告了我们在基于磷掺杂的LaFeO3 _-δ的双功能催化剂在碱性溶液中用于ORR和OER的开发中的发现。了显着的电催化性能归因于较大的量ö ₂ ^2- / O ^-物种，铁的微量⁴⁺物种，和优化È_克电子填充（≈1），得益于磷的掺杂作用。P掺杂后，质量活度和比活度都几乎翻了一番。密度泛函理论计算还证实，Fe离子的价态增加主要是由于磷掺杂引起的。这些结果表明，非金属元素掺杂是优化电子构型，改变离子的价态并因此增强钙钛矿型电催化剂活性的有效方法。