Effects of bridging ligands on the current - Potential behavior and interfacial kinetics of ruthenium-sensitized nanocrystalline TiO2 photoelectrodes

Kristine Kilså, Elizabeth I. Mayo, Darius Kuciauskas, Randy Villahermosa, Nathan S Lewis, Jay R. Winkler, Harry B. Gray

Research output: Contribution to journalArticle

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Abstract

We have shown that RuII(bpy)2(bpy-4-(xylyl)x-≡-phenyl-COOH)( PF6)2 (abbreviated Rux, where x = 0, 1 or 2 xylyl groups; bpy = 2,2′-bipyridine) dyes can act as sensitizers for nanocrystalline TiO2 in functional photoelectrochemical cells under simulated solar illumination, albeit with low efficiencies. Both the short-circuit photocurrent density and the open-circuit voltage decreased as x was increased. Electron injection (106-108 s-1) was slightly faster for the x = 0 dye, but both recombination (10-1--10-13 cm3 s-1) and regeneration (104-106 s-1 for 10 mM I-) were slightly faster for the x = 2 dye. We suggest that the lack of distance dependence is due to the flexible one-carboxyl attachment to the surface resulting in the Ru-TiO2 electron-tunneling distance being very similar for x = 0, 1, and 2. For all of the Rux sensitizers, a relatively small potential was needed for generation of current in the dark, indicating that the reaction between electrons in TiO2 and the I3 -/I- electrolyte solution is as favorable for the Rux sensitizers as for unmodified TiO2 electrodes.

Original languageEnglish
Pages (from-to)3379-3383
Number of pages5
JournalJournal of Physical Chemistry A
Volume107
Issue number18
DOIs
Publication statusPublished - May 8 2003

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Ruthenium
ruthenium
Coloring Agents
dyes
Ligands
Photoelectrochemical cells
ligands
Electron injection
Kinetics
Electron tunneling
kinetics
Open circuit voltage
Photocurrents
Short circuit currents
Electrolytes
Lighting
short circuits
electron tunneling
open circuit voltage
regeneration

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

Cite this

Effects of bridging ligands on the current - Potential behavior and interfacial kinetics of ruthenium-sensitized nanocrystalline TiO2 photoelectrodes. / Kilså, Kristine; Mayo, Elizabeth I.; Kuciauskas, Darius; Villahermosa, Randy; Lewis, Nathan S; Winkler, Jay R.; Gray, Harry B.

In: Journal of Physical Chemistry A, Vol. 107, No. 18, 08.05.2003, p. 3379-3383.

Research output: Contribution to journalArticle

Kilså, Kristine ; Mayo, Elizabeth I. ; Kuciauskas, Darius ; Villahermosa, Randy ; Lewis, Nathan S ; Winkler, Jay R. ; Gray, Harry B. / Effects of bridging ligands on the current - Potential behavior and interfacial kinetics of ruthenium-sensitized nanocrystalline TiO2 photoelectrodes. In: Journal of Physical Chemistry A. 2003 ; Vol. 107, No. 18. pp. 3379-3383.
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