Fig. 4

GCD curves at varying current densities (1–5 mA·cm⁻²) for (a) pristine Ni(OH)₂ and (b) high energy X-ray irradiated f-Ni(OH)₂ electrodes, and corresponding Nyquist plots from EIS analysis for (c) pristine and irradiated electrodes in 1.0 M Na₂SO₄ electrolyte.