For electrochemical splitting of water, highly active and non-precious metal electrocatalysts towards the oxygen evolution reaction (OER) are direly needed to address the cost and stability issues. Herein, polypyrrole (PPy) with 3D flower-like structure has been prepared to obtain N-doped porous carbon sheets (N–C) and to implant with cobalt oxides (Co₃O₄) via simple and cost-effective hydrothermal reaction. Benefitting from the 3D flower-like porous carbon structure, Co₃O₄/N–C demonstrates enlarged surface area replenished with more electrocatalytic active sites. What's more, Co₃O₄ nanoparticles are evenly dispersed onto the N-doped carbon surface which effectively prevents their aggregation and detachment. These exclusive structural features render amazing catalytic activity for Co₃O₄/N–C towards OER with an onset potential of ~1.31 V (vs RHE), low overpotential of 120 mV at 10 mA cm⁻² and a Tafel slope of only 33 mV dec⁻¹ in basic media. This work presents a simple approach to meet an ideal catalytic material with better morphology and advantageous properties for the possible energy and environmental applications.

对于水的电化学分解，迫切需要朝着氧释放反应（OER）的高活性和非贵金属电催化剂，以解决成本和稳定性问题。在此，已经准备了具有3D花状结构的聚吡咯（PPy），以获得N掺杂的多孔碳片（NC），并通过简单且经济高效的水热反应植入钴氧化物（Co ₃ O ₄）。得益于3D花状多孔碳结构，Co ₃ O ₄ / N–C显示出扩大的表面积并补充了更多的电催化活性位。而且，Co ₃ O ₄纳米颗粒均匀地分散在N掺杂的碳表面上，这有效地防止了它们的聚集和脱离。这些独特的结构特征使Co ₃ O ₄ / N–C对OER具有惊人的催化活性，其起始电势约为1.31 V（vs RHE），在10 mA cm ^-2时的低过电势为120 mV，Tafel斜率仅为33在基本培养基中，mV dec ^-1。这项工作提出了一种简单的方法来满足理想的催化材料，该材料具有更好的形态和有利的性能，适用于可能的能源和环境应用。