fig1

Figure 1. (A) Corrosion-derived surface reconstruction of NFF for achieving efficient RuO₂/NiFe(OH)_x electrocatalysts; (B and C) Corrosion polarization curves (inset: photos of the synthesized NFF, NiFe(OH)_x and RuO₂/NiFe(OH)_x electrodes); (D) Comparison of the calculated corrosion potentials and corrosion current densities. NFF: NiFe foams; SCE: saturated calomel electrode; HER: hydrogen evolution reaction.