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A one-step synthesis of hierarchical porous CoFe-layered double hydroxide nanosheets with optimized composition for enhanced oxygen evolution electrocatalysis
Hierarchical porous CoFe-LDHs composed of ultrathin nanosheets were successfully prepared by a simple one-step precipitation process of Co
2+
and Fe
3+
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 Co
8
Fe
1
-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 (IrO
2
) electrocatalysts, suggesting its promising application as an efficient electrode for OER.
Hierarchical porous CoFe-LDHs composed of ultrathin nanosheets were prepared
via
a simple one-step precipitation process and exhibit excellent electrocatalytic activity and outstanding durability for OER in alkaline media.