Hierarchical porous CoFe-LDHs composed of ultrathin nanosheets were successfully prepared by a simple one-step precipitation process of Co²⁺ and Fe³⁺ ions, avoiding multiple tedious steps. The optimized composition and the hierarchical porous structure design of the CoFe-LDHs endow them with high activity for OER in alkaline media (1 M KOH). Benefiting from the synergistic catalytic effects of the controllable composition and the structural features of CoFe-LDHs, the superior OER performance of hierarchical porous Co₈Fe₁-LDH nanosheets with optimal composition is achieved with the smallest overpotential (262 mV at 10 mA cm⁻²), lowest Tafel slope (42 mV per decade), and excellent long-term stability, which is superior to previously reported LDH-derived and commercial iridium dioxide (IrO₂) electrocatalysts, suggesting its promising application as an efficient electrode for OER.

中文翻译：

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一步法合成分层多孔CoFe层状双氢氧化物纳米片，具有优化的成分以增强析氧电催化作用

通过简单的一步一步沉淀Co ²⁺和Fe ³⁺离子的过程，成功地制备了由超薄纳米片组成的分层多孔CoFe-LDH ，避免了繁琐的步骤。CoFe-LDHs的优化组成和分层多孔结构设计使其在碱性介质（1 M KOH）中对OER具有很高的活性。从由CoFe-水滑石的可控组合物的协同催化作用和结构特征中获益，分级多孔Co的优异的性能OER ₈的Fe _1个-LDH纳米片具有最佳组合物与最小的超电势（262毫伏在10mA厘米实现^{- 2个}），最低的Tafel斜率（每十年42 mV）和出色的长期稳定性，优于先前报道的LDH衍生和商业化的二氧化铱（IrO ₂）电催化剂，表明其有望成为OER的高效电极。