Fig. 3.

(A) Current−time traces over 10-s dark−light cycles for FTO|SnO₂/TiO₂|–RuP²⁺/WOC and FTO|SnO₂/AgNP/TiO₂|–RuP²⁺/WOC electrodes at an applied bias of 0.2 V vs. Ag/AgCl. (B) Current density vs. applied voltage curves for the same electrodes under light and dark conditions. White-light illumination at an intensity of 100 mW cm⁻² was used with a 400-nm cutoff filter. All scans were performed at a scan rate of 50 mV/s. The experiments were carried out in 0.1 M acetic acid/acetate buffer at pH 4.65, 0.4 M in NaClO₄.