Shaping the energy landscape through development of more efficient electrochemical energy conversion and storage devices requires significant advancements in the catalysis of key electrochemical processes involving oxygen. This is especially the case for the oxygen evolution reaction (OER), which is largely challenged by the cost-ineffectiveness of the best performing electrocatalysts (i.e., Ru, Ir), along with their limited stability under acidic conditions. This presents a roadblock in the development of robust acid-based polymer exchange membrane electrochemical systems, currently the most advanced technologies for electrochemical energy conversion. Approaches such as dilution of Ru/Ir into flexible mixed metal oxide frameworks have been used as alternative strategies in designing robust OER electrocatalysts. Herein, we discuss the state of research in this area and detail the effect of the composition and structure of mixed metal oxides on their acidic OER activity and stability. Future directions for developing mixed metal oxide electrocatalysts suitable for acidic electrochemical environments are devised.

通过开发更有效的电化学能量转换和存储设备来塑造能源格局，需要在涉及氧气的关键电化学过程的催化方面取得重大进展。放氧反应（OER）尤其如此，这在很大程度上受到性能最佳的电催化剂（即Ru，Ir）的成本低廉以及在酸性条件下有限的稳定性的挑战。这为开发坚固的基于酸的聚合物交换膜电化学系统（目前是电化学能量转换的最先进技术）提供了障碍。诸如将Ru / Ir稀释到柔性混合金属氧化物骨架中的方法已被用作设计坚固的OER电催化剂的替代策略。在这里 我们讨论了该领域的研究现状，并详细说明了混合金属氧化物的组成和结构对其酸性OER活性和稳定性的影响。设计了开发适用于酸性电化学环境的混合金属氧化物电催化剂的未来方向。