fig8

Figure 8. (A) Schematic illustration of synthetic process of N-NiFe-MOF; (B) LSV curves of N-NiFe-MOF, NiFe-MOF, NiFe-LDH and IrO₂ with a scan rate of 1 mV·s^-1 (inset: corresponding overpotential at 100 mA·cm^-2); (C) The corresponding Tafel slope plots from LSV curves; (D) Gibbs free energy illustration by N-NiFe-MOF (^*Fe) and NiFe -MOF (^*Fe) in OER process. (A)-(D) were reproduced with permission^[100]. Copyright 2022, Elsevier. MOF: Metal-organic framework; LSV: linear sweep voltammetry; LDH: layered double hydroxide; OER: oxygen evolution reaction.