A conductive SnO ₂ layer and small quantities of IrO ₂ surface cocatalyst enhance the catalytic efficiency of nanoporous Fe ₂ O ₃ electrodes in the oxygen evolution reaction at neutral pH. Anodic alumina templates are therefore coated with thin layers of SnO ₂ , Fe ₂ O ₃ , and IrO ₂ by atomic layer deposition. In the first step, the Fe ₂ O ₃ electrode is modified with a conductive SnO ₂ layer and submitted to different postdeposition thermal treatments in order to maximize its catalytic performance. The combination of steady-state electrolysis, electrochemical impedance spectroscopy, X-ray crystallography, and X-ray photoelectron spectroscopy demonstrates that catalytic turnover and e ⁻ extraction are most efficient if both layers are amorphous in nature. In the second step, small quantities of IrO ₂ with extremely low iridium loading of 7.5 µg cm ⁻² are coated on the electrode surface. These electrodes reveal favorable long-term stability over at least 15 h and achieve maximized steady-state current densities of 0.57 ± 0.05 mA cm ⁻² at η = 0.38 V and pH 7 (1.36 ± 0.10 mA cm ⁻² at η = 0.48 V) in dark conditions. This architecture enables charge carrier separation and reduces the photoelectrochemical water oxidation onset by 300 mV with respect to pure Fe ₂ O ₃ electrodes of identical geometry.