Exploring highly durable and active electrocatalysts for water oxidation in acidic electrolytes remains a great challenge, because of the easy dissolution of active sites under harsh working conditions. Maintaining the coordination structure of active sites in the process of acidic oxygen evolution reaction (OER) to resist local active sites dissolution is theoretically viable, but rarely reported. Here, a new type of iridium-based oxide Cr-SrIrO₃ with body-centered cubic structure (BCC-Cr-SrIrO₃) is designed for boosting acidic-OER. Thanks to this unique atomic structure, an amorphous layer of CrIrO_x with edge-shared CrO_x and IrO_x octahedrons was in situ formed by quick leaching of only Sr over BCC-Cr-SrIrO₃ during the OER process. The edge-shared metal-oxygen octahedrons act as a tunable catalytic platform to optimize the acidic-OER, where the electron synergistic coupling effect between bimetallic octahedrons improves the OER activity by tens of times per iridium site with a mass activity of 417.6 A g_Ir⁻¹ at 0.3 V overpotential; while the strong coordination persistence of iridium sites in the edge-shared octahedrons under working potentials dictates superior durability with a large stability number of 7 × 10⁵ in 0.1 M HClO₄. This study promises a new route for the design of superior iridium-based acidic-OER catalysts.

探索在酸性电解质中用于水氧化的高度耐用和活性的电催化剂仍然是一个巨大的挑战，因为在恶劣的工作条件下活性位点很容易溶解。在酸性析氧反应（OER）过程中保持活性位点的配位结构以抵抗局部活性位点溶解在理论上是可行的，但很少报道。在此，设计了一种新型的体心立方结构铱基氧化物Cr-SrIrO _{3 (BCC-Cr-SrIrO 3} )，用于提高酸性OER。由于这种独特的原子结构，具有边缘共享的 CrO _x和 IrO _x八面体的 CrIrO _{x无定形层}在原位在 OER 过程中仅通过 BCC-Cr-SrIrO _{3快速浸出 Sr 形成。}边缘共享的金属-氧八面体作为一个可调谐的催化平台来优化酸性-OER，其中双金属八面体之间的电子协同耦合效应将每个铱位点的 OER 活性提高了数十倍，质量活性为 417.6 A g _Ir ^-1在 0.3 V 过电位；而在工作电位下，边缘共享八面体中铱位点的强配位持久性决定了在 0.1 M HClO _{4中具有 7 × 10} ⁵的大稳定性数的优异耐久性。该研究为设计优质铱基酸性 OER 催化剂提供了一条新途径。