Electrochemical oxygen evolution reaction is an appealing way to alleviate energy and environmental crisis. Perovskite oxides are supposed as attractive low-cost alternative electrocatalysts for oxygen evolution reaction relative to the IrO₂ and RuO₂ electrocatalysts. In this study, Fe-Ni coupled perovskite oxides, Pr_0.5Ba_0.5Fe_1-xNi_xO_3-δ, are proposed as novel electrocatalysts for oxygen evolution reaction in alkaline solution. The electrocatalytic activity of perovskites are optimized by engineering the couple of Fe-Ni cations. We identify a possible correlation between the enhancement in the activity and the amount of surface oxygen vacancies, OH⁻ adsorption, charge transfer kinetics as well as e_g-filling. The Pr_0.5Ba_0.5Fe_0.975Ni_0.025O_3-δ electrocatalyst demonstrates excellent activity for oxygen evolution reaction, favorably compared to other the state-of-the-art perovskite electrocatalysts. The encouraging results indicate that Pr_0.5Ba_0.5Fe_1-xNi_xO_3-δ series is a promising class of electrocatalysts for practical application of oxygen evolution reaction.

电化学制氧反应是缓解能源和环境危机的一种有吸引力的方法。相对于IrO ₂和RuO ₂电催化剂，钙钛矿氧化物被认为是用于氧气析出反应的有吸引力的低成本替代电催化剂。在这项研究中，提出了Fe-Ni耦合的钙钛矿氧化物Pr _0.5 Ba _0.5 Fe _1-x Ni _x O3 _-δ，作为碱性溶液中氧析出反应的新型电催化剂。钙钛矿的电催化活性可通过对Fe-Ni阳离子进行优化来实现。我们发现活性的增强与表面氧空位OH的量之间可能存在相关性^-吸附，电荷转移动力学以及电子_克-填充。与其他最先进的钙钛矿型电催化剂相比，Pr _0.5 Ba _0.5 Fe _0.975 Ni _0.025 O3 _-δ电催化剂表现出优异的氧释放反应活性。令人鼓舞的结果表明，Pr _0.5 Ba _0.5 Fe _1-x Ni _x O3 _-δ系列是用于氧释放反应的实际应用的有前途的一类催化剂。