Fig. 4.

Current-density–time curves for photoelectrochemical experiments performed at 22 ± 1 °C using assembly 1 on a 3.6-nm TiO₂ shell formed by ALD on nanoITO-coated FTO electrodes immersed in pH 4.6, 20 mM acetate/acetic acid buffer (0.5 M in LiClO₄) as a function of 445-nm light intensity: 91 mW (red), 58 mW (black), 7.8 mW (blue). Experiments were performed in the presence of air with 0.2 V vs. NHE applied voltage bias. Counter electrode, Pt wire; reference electrode, Ag/AgCl (3 M NaCl; 0.207 V vs. NHE).