fig6

Figure 6. PEC performance of Ti/Fe₂O₃, Ti/Fe₂O₃/Cu₂S, and Ti/Fe₂O₃/Cu₂S/Co(OH)_x photoanodes. (A) Chopped LSV curves under AM 1.5G (100 mW/cm²); (B) Chopped LSV curves under visible light (λ > 420 nm, 66.7 mW/cm²); (C) ABPE curves under AM 1.5G (100 mW/cm²); (D) ABPE curves under visible light irradiation (λ > 420 nm, 66.7 mW/cm²); (E) I-t data plots at 1.23 V vs. RHE; (F) PEC H₂ evolution across different samples at 1.23 V vs. RHE. PEC: Photoelectrochemical; LSV: linear sweep voltammetry; ABPE: applied bias photon-to-current efficiency; RHE: reversible hydrogen electrode.