Two-dimensional transition metal hydroxides with abundant reserves and low prices have played an indispensable role in energy catalytic applications. Recent reports indicated that the incorporation of Fe species into Co-based catalysts can synergistically enhance oxygen evolution reaction (OER) activity. Constructing a heterointerface on the surface of Co-based catalysts can provide a platform to investigate the role of heterointerface in reaction kinetics. Herein, we constructed a Fe-O-Co heterointerface without electronic effect by depositing FeO_x clusters on the oxygen vacancies of CoOOH surface. FeO_x/CoOOH exhibited excellent OER intrinsic activity, which can deliver the turnover frequency (TOF) of 4.56 s⁻¹ at the overpotentials of 300 mV and the Tafel slope of 33 mV×dec⁻¹. In-situ electrochemical impedance spectroscopy (EIS) and density functional theory (DFT) calculations demonstrated that the synergistic effect between Fe sites and Co sites confined at the Fe-O-Co heterointerface accelerated the charge transfer during OER and optimized the adsorption of oxygen intermediates, consequently enhancing OER.

储量丰富、价格低廉的二维过渡金属氢氧化物在能源催化应用中发挥着不可或缺的作用。最近的报道表明，将 Fe 物种掺入 Co 基催化剂中可以协同增强析氧反应 (OER) 活性。在钴基催化剂表面构建异质界面可以为研究异质界面在反应动力学中的作用提供平台。在此，我们通过在 CoOOH 表面的氧空位上沉积 FeO _x团簇，构建了无电子效应的 Fe-O-Co 异质界面。FeO _x ^{/CoOOH 表现出优异的 OER 固有活性，可提供 4.56 s − 1}的周转频率 (TOF)^{在 300 mV 的过电势和 33 mV×dec -1}的 Tafel 斜率下。原位电化学阻抗谱 (EIS) 和密度泛函理论 (DFT) 计算表明，限制在 Fe-O-Co 异质界面上的 Fe 位点和 Co 位点之间的协同效应加速了 OER 过程中的电荷转移并优化了氧中间体的吸附，从而提高 OER。