Fig. 7. Photoelectrochemical generator–collector measurements (chronoamperometry) of TiO2–2 (red) and TiO2–2Na2–1 (dark blue) at pH 5.8 and pH 7.2. Solid lines are the photoanode current; dashed lines, collector current; collector efficiency ca. 60%. Applied bias 0 mV vs. Ag/AgCl, illuminated with a 455 nm LED (33 mW cm–2). Photocurrent densities are reported in Table 4.
