The construction of a stable catalytic interface is the key step of heterogeneous catalysis for water splitting. However, it is very difficult to controllably regulate the performances of dynamic interfaces especially for industrial application. Based on this, we found that FeOOH-transformation equilibrium and the Fe* adsorption-dissolution equilibrium could be regulated simultaneously to achieve the continuous update of the catalytic interface by changing the Fe³⁺ concentration in alkaline electrolyte. FeOOH-Ni-based oxygen evolution catalysts with high activity and long-term stability can be synthesized by in-situ electro-activation and directional regulation of catalytic equilibrium. Moreover, this strategy is suitable for almost all nickel-based materials, including Ni-MOF, Ni₂P, Ni₃S₂, Ni(OH)₂, NiO. Among them, FeOOH-NiBDC-NF shows excellent activity for OER: when the current density reached 100 mA cm⁻² and 500 mA cm⁻², the overpotential is only 278 mV and 316 mV, respectively. Interestingly, the active catalytic interface can be updated in situ by directional adjustment of dynamic equilibrium, which can conveniently maintain the activity and stability of the catalysts. Finally, after testing at a large current density of 500 mA cm⁻² for 100 h, FeOOH-NiBDC-NF still maintained excellent performance. This study shows that the strategy of directionally regulating ion equilibrium at the dynamic interface is effective.

构建稳定的催化界面是多相催化分解水的关键步骤。然而，动态接口的性能很难可控地调节，尤其是在工业应用中。基于此，我们发现通过改变碱性电解液中的Fe ³⁺浓度，可以同时调节FeOOH-转化平衡和Fe*吸附-溶解平衡，实现催化界面的不断更新。通过原位电活化和催化平衡的定向调节可以合成具有高活性和长期稳定性的FeOOH-Ni基析氧催化剂。此外，该策略几乎适用于所有镍基材料，包括 Ni-MOF、Ni ₂P、Ni ₃ S ₂、Ni(OH) ₂、NiO。其中，FeOOH-NiBDC-NF对OER表现出优异的活性：当电流密度达到100 mA cm ^-2和500 mA cm ^{-2 时}，过电位分别仅为278 mV和316 mV。有趣的是，活性催化界面可以通过动态平衡的定向调节进行原位更新，可以方便地保持催化剂的活性和稳定性。最后，在 500 mA cm ^-2的大电流密度下测试100 h 后，FeOOH-NiBDC-NF 仍然保持优异的性能。该研究表明，在动态界面处定向调节离子平衡的策略是有效的。