Journal article

Publication year: 2006

Pages: 5832-5839

Journal: Chemistry - A European Journal

Volume number: 12

Issue number: 22

ISSN: 0947-6539

eISSN: 1521-3765

DOI Link: https://doi.org/10.1002/chem.200501241

Publisher: Wiley

Abstract: 
Eosin Y is used as a sensitizer for nanoporous zinc oxide films for prospective applications in photoelectrochernical solar cells. ne kinetics of the reduction of the intermittently formed photo-oxidized dye molecules by iodide ions in the electrolyte phase was investigated by using the feedback mode of scanning electrochemical microscopy (SECM). The bulk solution phase contained triiodide as electron transfer mediator, from which the ul-tramicroelectrode-generated iodide ions acted as electron donors for photo-oxidized Eosin Y molecules (D+(ads)) at the zinc oxide sample. Effective rate constants for the dye regeneration could be extracted from the SECM approach curves. The effective rate constants at different triiodide concentrations could be related to the rate constant for the reaction of the dissolved donor with photo-oxidized Eosin Y bound to ZnO, as well as to the overall rate of the photosensitization process. For the reaction D-ads(+) + 1.5I(-)-> D-ads + 0-5I(3)(-) a rate constant of k(ox)= (1.4 +/- 0.8)x 10(8)cm (9/2)mol-(3/2)s(-1) was determined.

Harvard Citation style: Shen, Y., Nonomura, K., Schlettwein, D., Zhao, C. and Wittstock, G. (2006) Photoelectrochemical kinetics of eosin Y-sensitized zinc oxide films investigated by scanning electrochemical microscopy, Chemistry - A European Journal, 12(22), pp. 5832-5839. https://doi.org/10.1002/chem.200501241

APA Citation style: Shen, Y., Nonomura, K., Schlettwein, D., Zhao, C., & Wittstock, G. (2006). Photoelectrochemical kinetics of eosin Y-sensitized zinc oxide films investigated by scanning electrochemical microscopy. Chemistry - A European Journal. 12(22), 5832-5839. https://doi.org/10.1002/chem.200501241