Fig. 3. (a) LSV (5 mV s⁻¹) of FeAs and Fe-based reference materials loaded on NF (1 mg cm⁻²) and bare NF, (b) Tafel slopes obtained from LSV of materials deposited on NF (1 mV s⁻¹), (c) Nyquist plot constructed from the EIS experiment at 1.51 V vs. RHE, and (d) 24 h CP measurement of FeAs/NF and Fe-based reference materials.