Fig. S3.

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