Efficient electrocatalysts for oxygen evolution reaction (OER) in acid are critical to the development of clean energy conversion schemes. Lattice-oxygen-mediated mechanism (LOM) has been developed to boost OER kinetic via triggering lattice oxygen redox. However, the promoted intrinsic activity is compromised by low stability due to bulk structure reconstruction during OER. Here, we demonstrate that a single-site Ir-doping strategy can effectively address this challenge. Attributing to the carefully defined chelation environment of Ir, increased Ir–O covalency and engaged lattice oxygen oxidation have been observed. More importantly, locally triggered LOM introduces no structure evolution during OER. As a result, the constructed catalyst (Ir–MnO₂) exhibited over 42 times more mass activity than that of commercial IrO₂ as well as over 650 h stability with only a 15 mV increase in overpotential. Our work opens up a feasible strategy to boost OER activity and stability simultaneously.

用于酸中析氧反应 (OER) 的高效电催化剂对于开发清洁能源转换方案至关重要。已开发出晶格氧介导机制 (LOM) 以通过触发晶格氧氧化还原来提高 OER 动力学。然而，由于 OER 过程中的本体结构重建，低稳定性会损害所促进的内在活性。在这里，我们证明了单点 Ir 掺杂策略可以有效地解决这一挑战。归因于精心定义的 Ir 螯合环境，已观察到 Ir-O 共价性增加和参与的晶格氧氧化。更重要的是，局部触发的 LOM 在 OER 期间没有引入结构演变。结果，构建的催化剂（Ir-MnO ₂) 表现出比商业 IrO _{2 高}42 倍的质量活性以及超过 650 小时的稳定性，过电位仅增加 15 mV。我们的工作开辟了一个可行的策略，以同时提高 OER 活动和稳定性。