Fig. 3. (a) 20 successive CV cycles of 0.75 mM 1 with the FTO working electrode (S = 0.25 cm2) at a 50 mV s–1 scan rate. (b) Catalytic currents in CPE with or without 1 (0.75 mM) using the FTO electrode (S = 1.0 cm2) at an applied potential of 1.30 V. (c) CVs of the FTO electrode after 10 h CPE with 1, the FTO electrode after 20 successive CV cycles with 1, and a freshly cleaned FTO electrode in the buffer-only solution. Conditions: 0.10 M pH 7.0 phosphate buffer, 100 mV s–1 scan rate, and 20 °C. (d) UV-vis spectra of 1 before and after 10 h CPE.
