fig3

Figure 3. (A) Schematic representation for the formation of NiFe-NFF electrode and (B) SEM images and electrocatalytic properties of NiFe-NFF electrode and other samples for OER. (A) and (B) were reproduced with permission^[78]. Copyright 2019, Wiley-VCH; (C) Schematic diagram for the growth of FeNiBDC/SSM composite (Step I-IV), reproduced with permission^[47]. Copyright 2022, Elsevier. NFF: NiFe alloy foam; SEM: scanning electron microscope; OER: oxygen evolution reaction; BDC: 1,4-benzenedicarboxylate; SSM: stainless-steel matrix.