Photoaction spectra of N3 bound to nanocrystalline TiO2 films in the presence of different electron mediators in MPN solutions: 0.25 M LiI/25 mM (circles), 0.25 M Co mM NOBF4 (squares), 0.25 M Co mM NOBF4 (diamonds), 0.25 M Co mM NOBF4 (triangles), 0.25 M Co mM NOBF4 (upside down triangles), and saturated (0.15 M) Co mM NOBF4 (crosses). 0.25 M LiClO4 was added to all solutions containing a cobalt mediator.
