Figure 7.

A) Synthesis process of FeNi LDH‐GO by the anion exchange a) and SEM images of as‐synthesized FeNi‐CO₃ LDHs b,e), FeNi‐Cl LDHs c,f), and FeNi‐GO LDHs d,g); B) XRD pattern and XPS spectra of FeNi LDHs. a) XRD patterns of as‐synthesized FeNi‐CO₃ LDHs, FeNi‐Cl LDHs, and FeNi‐GO LDHs. b) XPS spectrum of C 1s for as‐synthesized FeNi‐GO LDH hybrid. C) Electrochemical properties of all synthesized catalysts for OER. a) The LSV curves of FeNi LDH, FeNi LDH+GO, FeNi LDH/GO, FeNi‐GO LDH, and FeNi‐rGO LDH on nickel foam electrodes in 1 m KOH electrolyte; b) the corresponding onset potential and potential at a current density of 10 mA cm⁻²; c) chronopotentiometry curves of the FeNi‐rGO LDH on nickel foam at 5, 10, and 20 mA cm⁻², respectively; d) the LSV curves of FeNi‐rGO LDH and rGO before and after chronopotentiometry measurement at constant a current density of 10 mA cm⁻² for about 8 h. Reproduced with permission.76 Copyright 2014, Wiley‐VCH.