fig2

Figure 2. (A) Digital image of the electrode (0.1 × 1 m²) and SEM images of the selected areas 1-6; (B) Chronopotentiometric curves of 3D-O₂-Cat-1 and 3D-O₂-Cat-2 in 1 M KOH at 1,000 mA·cm^-2; (C) Proposed corrosion mechanism for corrosion engineering^[25]. Reproduced under the terms of the Creative Commons Attribution License; (D) Schematic of the NiFe-LDH@IF growth mechanism; (E) SEM image of the four-layer structure of NiFe-LDH@IF-200-72. Reproduced with permission^[29]. Copyright 2021 Wiley-VCH; (F) Schematic of CoFe(OH)_x-m/NFF electrodes fabrication; (G) In situ Raman spectra of CoFe(OH)_x-500/NFF at different voltages during OER. Reproduced with permission^[37]. Copyright 2024, Wiley-VCH. SEM: Scanning electron microscope; LDH: layered double hydroxide; IF: iron foam; OER: oxygen evolution reaction.