Surface-reconstructed FeOOH@CoFeOS/NF architectures: leveraging nano-layered stacking for accelerated oxygen evolution kinetics†

Abstract

A high-efficiency oxygen-evolution reaction (OER) catalyst (FeOOH@CoFeOS/NF) was synthesized on nickel foam (NF), utilizing an intermolecular synergistic effect. The optimized FeOOH@CoFeOS/NF catalyst demonstrated outstanding alkaline OER performance, exhibiting a low overpotential of 212 mV at 10 mA cm⁻² (η10) (25 °C), along with a small Tafel slope of 62.8 mV dec⁻¹. Notably, FeOOH@CoFeOS/NF maintained its stability in 1.0 M KOH for 38 h. The achieved results surpassed those of the majority of transition metal oxide sulfide catalysts. This research contributes a valuable methodology for leveraging intermolecular cooperative effects and the development of high-performance OER electrocatalysts.