Fig. 6. (a) FT-IR spectra of pre-cycled (black line) and post-cycled (red line) Cl⁻-intercalated NiFe LDH and (b) XRD pattern for NiFe LDH after 200 cycles between 1.02–1.62 V vs. RHE at 5 mV s⁻¹. The α-NiFe LDH and γ-NiFeOOH phases are labelled, as well as a ferrihydrite signal at low d-spacing.¹.