fig6

Figure 6. (A) Schematic illustration of the synthesis of a-RuO₂/NiO nanosheets supported on nickel foam. Reprinted with permission from^[47]. Copyright 2023, American Chemical Society; (B) Schematic diagram of the formation process of CoWO₄/Ni_xFe_yS/NIF via two-step solvothermal method. Reprinted with permission from^[79]. Copyright 2024, Elsevier; (C) Schematic diagram of synthesis and structure of Pt-a/c-NiCoHPi. Reprinted with permission from^[48]. Copyright 2023, John Wiley and Sons. NIF: Nickel-iron bimetallic foam.