The oxygen evolution reaction (OER) on the anode is a vital electrocatalytic reaction in the field of energy conversion. Currently, transition metals-based nanomaterials are promising Ir/Ru-alternative OER electrocatalysts in alkaline media. In this work, we report that in-situ direct growth of atomically thick Fe doped Co₃O₄ holey nanosheets on nickel foam (Fe-Co₃O₄ H-NSs/NF) using a simple cyanogel−NaBH₄ route, which effectively avoids the tedious post-etch process of nanosheets using plasma, acid, alkali, and so on. Benefiting from ultrathin thickness (1.5 nm), numerous holes, and synergistic effect between Co and Fe atoms, Fe-Co₃O₄ H-NSs/NF provide a large specific surface area (199.12 m² g⁻¹) and highly active catalytic sites for the OER. Meanwhile, nickel foam substrate with three-dimensionally porous structure and high conductivity accelerates molecules/ions/gases transportation and electron transfer. Consequently, Fe-Co₃O₄ H-NSs/NF with optimal Co/Fe composition show super electrocatalytic performance for the OER, including an overpotential as small as ∼204 mV at 10 mA cm⁻² current density and a small Tafel slope of 38 mV dec⁻¹, which is much better than commercial RuO₂ nanoparticles.

阳极上的氧释放反应（OER）在能量转换领域是至关重要的电催化反应。当前，基于过渡金属的纳米材料在碱性介质中有望成为Ir / Ru替代OER电催化剂。在这项工作中，我们报道了使用简单的氰基凝胶-NaBH ₄途径在镍泡沫（Fe-Co ₃ O ₄ H-NSs / NF）上原位直接生长原子掺杂的Fe掺杂的Co ₃ O ₄多孔纳米片。避免了使用等离子，酸，碱等进行繁琐的纳米片后蚀刻过程。受益于超薄厚度（1.5 nm），大量孔洞以及Co和Fe原子，Fe-Co ₃ O ₄之间的协同效应H-NSs / NF为OER提供了大的比表面积（199.12 m ² g ^-1）和高活性的催化位。同时，具有三维多孔结构和高电导率的泡沫镍基材可加速分子/离子/气体的传输和电子转移。因此，具有最佳Co / Fe组成的Fe-Co ₃ O ₄ H-NSs / NF对OER表现出超强的电催化性能，包括在10 mA cm ^-2的电流密度下低至〜204 mV的过电势和小的Tafel斜率。 38 mV dec ^-1，比市售RuO ₂纳米粒子好得多。