Figure 4

CVs (scan rate 25 mV/s) of 1 in pH 2 (phosphate buffer) (a), 7 (phosphate buffer) (b), 12 (phosphate buffer) (c) and 14 (KOH). Data for a bare FTO are shown in green. Tafel plots for 1 in pH 2 (red), 7 (black), 12 (blue), in bufferic phosphate solution and 14 (pink) in KOH.