Structure−property relationships in phosphonate-derivatized, Ru(II) polypyridyl dyes on metal oxide surfaces in an aqueous environment

Hanson, Kenneth, Brennaman, M. Kyle, Ito, Akitaka, Luo, Hanlin, Song, Wenjing, Parker, Kelsey A., Ghosh, Rudresh, Norris, Michael R. , Glasson, Christopher R.K., Concepcion, Javier J., Lopez, Rene, and Meyer, Thomas J. (2012) Structure−property relationships in phosphonate-derivatized, Ru(II) polypyridyl dyes on metal oxide surfaces in an aqueous environment. Journal of Physical Chemistry Part C, 116 (28). pp. 14837-14847.

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Abstract

The performance of dye-sensitized solar and photoelectrochemical cells is strongly dependent on the light absorption and electron transfer events at the semiconductor–small molecule interface. These processes as well as photo/electrochemical stability are dictated not only by the properties of the chromophore and metal oxide but also by the structure of the dye molecule, the number of surface binding groups, and their mode of binding to the surface. In this article, we report the photophysical and electrochemical properties of a series of six phosphonate-derivatized [Ru(bpy)3]2+ complexes in aqueous solution and bound to ZrO2 and TiO2 surfaces. A decrease in injection yield and cross surface electron-transfer rate with increased number of diphosphonated ligands was observed. Additional phosphonate groups for surface binding did impart increased electrochemical and photostability. All complexes exhibit similar back-electron-transfer kinetics, suggesting an electron-transfer process rate-limited by electron transport through the interior of TiO2 to the interface. With all results considered, the ruthenium polypyridyl derivatives with one or two 4,4'-(PO3H2)2bpy ligands provide the best balance of electron injection efficiency and stability for application in solar energy conversion devices.

Item ID: 33456
Item Type: Article (Research - C1)
ISSN: 1932-7455
Funders: US Department of Energy (DOE), Army Research Office (ARO)
Projects and Grants: DOE Award DE-SC0001011, DOE Award DE-SC0001298, ARO Grant W911NF-09-1- 0426, DOE FG02-06ER1578, DOE Award DE-EE0003188
Date Deposited: 04 Jun 2014 23:48
FoR Codes: 03 CHEMICAL SCIENCES > 0302 Inorganic Chemistry > 030207 Transition Metal Chemistry @ 50%
03 CHEMICAL SCIENCES > 0305 Organic Chemistry > 030503 Organic Chemical Synthesis @ 50%
SEO Codes: 85 ENERGY > 8505 Renewable Energy > 850504 Solar-Photovoltaic Energy @ 50%
97 EXPANDING KNOWLEDGE > 970103 Expanding Knowledge in the Chemical Sciences @ 50%
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