Publication date: 15th December 2025
Oxygen evolution reaction (OER) is an important component in electrochemical water electrolysis for sustainable hydrogen production. However, the industrial application of water-splitting technologies is limited by the high cost and limited stability of commercial electrocatalysts for OER, such as RuO and IrO . To address this challenge, the development of cost-effective and stable alternatives with high catalytic activity is essential. In this study, we utilized low-cost nickel foam (NF) as both the substrate and nickel source for the growth of Fe-doped nickel sulfide (Fe-NiS/NF) on the surface via a simple hydrothermal method. Subsequently, electrochemical reconstruction was conducted by applying a current density of 100 mA cm–2 for 10 minutes, which successfully transformed the nickel sulfide structure into the highly active nickel oxyhydroxide (NiOOH) site. This transformation yielded a core@shell (NiS@Fe-NiOOH) structure, where the oxy(hydroxide) shell serves as both active site and protection layer for the sulfide core. Furthermore, in situ Raman spectroscopy revealed that Fe incorporation enhances the reconstruction efficiency, thereby improving the catalytic performance. The resulting Fe-NiOOH/NiS/NF electrocatalyst exhibited a low overpotential of 278 mV at 100 mA cm–2 and maintained the performance for over 80 hours. Furthermore, in alkaline water splitting tests, the Fe-NiOOH/NiS/NF||Pt/C/NF cell exhibited a low cell voltage of 1.49 V at mA cm–2, outperforming recent studies. Therefore, this work presents a simple and effective strategy for producing the high-performance OER catalyst suitable for industrial water-splitting applications.
This work was supported by the National Research Foundation of Korea(NRF) grant funded by the Korea government(MSIT) (RS-2024-00345635).
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