Fig. 6
Regeneration rate is proportional to halogen polarizability. a Regeneration rate constants (k reg) for the reaction of Dye-X•+ (X is F, Cl, Br, I) on titanium dioxide (TiO2) substrates with 0.5–10 mM of I− (red) or 10–150 mM of [Co(bpy)3]2+ (blue). Dye-X•+ is created through 532 nm photoinduced electron injection. b In the case of iodide, k reg follows a linear correlation with substituent size, but the cobalt electrolyte tracks more closely with the ΔG rxn for the reaction between Dye-X•+ and [Co(bpy)3]2+ (b and Fig. 1)4,11
