Sensitization of TiO₂ by Supramolecules Containing Zinc Porphyrins and Ruthenium−Polypyridyl Complexes

Abstract

Modification of wide band gap semiconductor surfaces by a new generation of supramolecular sensitizers combining porphyrin and ruthenium-polypyridyl complexes leads to versatile molecular interfaces, allowing the exploitation of photoinduced charge transfer in photoelectrochemical devices.

Photoactivity of Metal-Phenylporphyrins Adsorbed on TiO2 Under Visible Light Radiation: Influence of Central Metal

“…This process involves the excitation of dye molecules with visible light and subsequent electron injection into conduction band (CB) of TiO 2 [3][4][5]. The injected electrons (e CB ) interact with molecular oxygen forming the superoxide anion radicals (O 2 •-) which could be the precursors of others active oxygen species such as •OH [6].…”

Novel meso-substituted porphyrins: Synthesis, characterization and photocatalytic activity of their TiO2-based composites

“…The porphyrin component enhances the visible light-sensibility of the TiO 2 matrix thus increasing its photocatalytic activity [21,[27][28][29]. Diverse functional groups anchored to the macrocycle were reported to influence the efficiency of TiO 2 -Pp systems, depending on the position of the substituent and spacer length [30], occurrence of strong polar groups (e.g.…”

Sevenfold enhancement on porphyrin dye efficiency by coordination of ruthenium polypyridine complexes

“…Finally, the steric and coulombic repulsions should minimize aggregation, a process that is known to decrease the photo-injection efficiency of porphyrin dyes. 20 Therefore, we believe that such supramolecular porphyrins constitute a promising class of DSSC photosensitizers in which the light harvesting efficiency should be further enhanced if porphyrin derivatives possessing higher (more negative) electron injection potentials are used.…”