Dye sensitized membranes within mesoporous TiO2: Photocurrents in aqueous solution

Autor:	Martin Erbacher, Daniela Bauer, Markus Haase, Jörg Nordmann, Dereje H. Taffa, Tamara Arnold, Murugavel Kathiresan, Lorenz Walder, Franz-Peter Montforts
Rok vydání:	2010
Předmět:	chemistry.chemical_classification Aqueous solution General Chemical Engineering Inorganic chemistry General Physics and Astronomy General Chemistry Photochemistry Hydrophobic effect chemistry.chemical_compound Membrane chemistry Chlorin Carboxylate Pyridinium Mesoporous material Alkyl
Zdroj:	Journal of Photochemistry and Photobiology A: Chemistry. 216:35-43
ISSN:	1010-6030
DOI:	10.1016/j.jphotochem.2010.09.003
Popis:	Mesoporous TiO 2 film electrodes were modified with membranes consisting of alkyl phosphonic acids with either a sulphonate or pyridinium head group. Dyes (substituted porphyrins ( 1 , 2 , and 3 ), a substituted chlorin ( 4 ) and a substituted Ru tris-bipyridyl complex ( 5 )) with tailored ionic (carboxylates, sulfonates, and ammonium) and hydrophobic functionalities were synthesized. The membrane modified electrodes were loaded with these dyes by self-assembling based on mutual charge compensation and hydrophobic interactions. The membrane electrodes can generate photocurrents upon white light illumination (16.5 mW/cm 2 ) in the range of 20–50 μA/cm 2 in aqueous 0.1 M KI solution. Dyes 3 and 4 perform better on the pyridinium membrane than directly attached via their carboxylate functionality. This demonstrates charge injection through the membrane into the conduction band of TiO 2 . ZINDO/S calculations indicate that the pyridinium head group assists this process.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::066f8c36868a478c953c63c44aef325e https://doi.org/10.1016/j.jphotochem.2010.09.003 Zobrazit plný text záznamu Full Text from ScienceDirect