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(a) Photocurrent density, (b) IPCE, (c) photochemical stability at 1.6 VRHE and (d) Faradic efficiencies of the particle-assembled β-Fe2O3 films with Zr doping under illumination of standard simulated sunlight (100 mW cm−2) in 1 M NaOH electrolyte (pH = 13.6). Reference sample: α-Fe2O3.
