Metal oxyhydroxides are regarded as active catalysts for oxygen evolution reaction (OER). Herein, we creatively report NiFeOOH is greatly activated by N-doping to get an efficient OER catalyst. The effect of N-doping in the resulted metal oxyhydroxides for the OER is revealed for the first time. N-doped NiFeOOH (N-NiFeOOH) is in-situ derived from N-(NiFe)₃S₂ precatalyst by electrochemical oxidation. N-NiFeOOH exhibits superior performance with a low overpotential of 278 mV at the current density of 100 mA cm⁻² and a small Tafel slope of 35.3 mV dec⁻¹, which is comparable to the most excellent non-noble catalysts. DFT calculations reveal that N-doping would lower the d-band center of the surface metal atoms and in turn increase the adsorption ability of *OH on NiFeOOH, thereby reducing the OER overpotential. The key role of N-doping in the NiFeOOH for enhancing OER performance is reported for the first time, which will shed light on the design of catalysts.

金属羟基氧化物被认为是氧释放反应（OER）的活性催化剂。在此，我们创造性地报道了NiFeOOH被N掺杂极大地活化，从而获得了有效的OER催化剂。首次揭示了氮掺杂对所得金属羟基氧化物的OER的影响。N掺杂的NiFeOOH（N-NiFeOOH）是通过N-（NiFe）₃ S ₂预催化剂通过电化学氧化原位生成的。N-NiFeOOH表现出卓越的性能，在100 mA cm ^-2的电流密度下具有278 mV的低过电势和35.3 mV dec ^-1的小Tafel斜率，与最出色的非贵金属催化剂相当。DFT计算表明，N掺杂会降低d表面金属原子的能带中心，进而提高了* OH在NiFeOOH上的吸附能力，从而降低了OER超电势。首次报道了在NiFeOOH中N掺杂对增强OER性能的关键作用，这将为催化剂的设计提供启示。