Mingjie Wu, Jian Luo, Qihang Qian, Lebin Cai, Xin Wang, Lin Tao, Yinghui Xu, Siyi Yang, Xun Cui, Yingkui Yang, Bao Yu Xia
Abstract Developing high‐performance, stable catalysts for the sluggish oxygen evolution reaction (OER) remains a critical challenge for sustainable energy technologies. While the lattice oxygen mechanism (LOM) offers a promising pathway to break the scaling adsorption relationship of the conventional adsorbate evolution mechanism (AEM), activating lattice oxygen without compromising structural integrity has proven elusive. Here, a novel strategy is reported to activate the local LOM by constructing Ag─Co atom pairs within CoOOH lattice via a facile silver mirror reaction coupled with electrochemical reconstruction. This activation of lattice oxygen arises from the enhanced Co─O covalency near Ag sites. The resulting catalyst achieves a low overpotential of 334 mV at 500 mA cm −2 and exhibits a 13‐fold enhancement in mass activity over pristine CoOOH. Crucially, the localized activation of lattice oxygen mitigates structural degradation, enabling exceptional stability—only a 10 mV overpotential increase after 120 h at 100 mA cm −2 . When integrated into a hybrid zinc battery, Ag‐CoOOH delivers a high‐energy efficiency of 86.2% (1 mA cm −1 ) and sustains operation for over 400 h. This work offers a novel paradigm for harnessing the LOM without sacrificing durability, providing a blueprint for designing next generation electrocatalysts for efficient energy conversion.