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 language | English |
|---|---|
| Pages (from-to) | 3379-3383 |
| Number of pages | 5 |
| Journal | Journal of Physical Chemistry A |
| Volume | 107 |
| Issue number | 18 |
| DOIs | |
| Publication status | Published - May 8 2003 |
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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 journal › Article
}
TY - JOUR
T1 - Effects of bridging ligands on the current - Potential behavior and interfacial kinetics of ruthenium-sensitized nanocrystalline TiO2 photoelectrodes
AU - Kilså, Kristine
AU - Mayo, Elizabeth I.
AU - Kuciauskas, Darius
AU - Villahermosa, Randy
AU - Lewis, Nathan S
AU - Winkler, Jay R.
AU - Gray, Harry B.
PY - 2003/5/8
Y1 - 2003/5/8
N2 - 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.
AB - 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.
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U2 - 10.1021/jp021921u
DO - 10.1021/jp021921u
M3 - Article
VL - 107
SP - 3379
EP - 3383
JO - Journal of Physical Chemistry A
JF - Journal of Physical Chemistry A
SN - 1089-5639
IS - 18
ER -