fig4

Figure 4. (A) Schematic of the synthesis procedures for the Fe foam supported NiFe-X NAs (X = O, P) and a 600 cm² OER electrode; (B) SEM images of NiFe-O NAs/Fe foam; (C) SEM images of NiFe-P nanowire; (D) OER polarization curves under 0-1,000 mA·cm^-2 in 1 M KOH; (E) HER polarization curves under 0-1,000 mA·cm^-2 in 1 M KOH; (F) Chronopotentiometric curves of the electrolyzer (6 M KOH + seawater, 60 °C, 1,000 mA·cm^-2). Reproduced with permission^[52]. Copyright 2024, Elsevier. NAs: Nanowire arrays; OER: oxygen evolution reaction; SEM: scanning electron microscope; HER: hydrogen evolution reaction.