Abstract
A series of osmium polypyridyl complexes having various ground-state reduction potentials has been synthesized and used to sensitize nanoporous titanium dioxide electrodes to solar illumination. The spectral response and current vs potential properties of electrodes modified with these dyes have been compared with the behavior of their ruthenium analogues. The trends can be explained by the differences in absorption spectra and ground-state redox potentials. The osmium, complexes appear to be promising candidates for further optimization in operating photoelectrochemical cells for solar energy conversion applications. Of the materials studied, all complexes having ground-state redox potentials in methanol more positive than ∼0.4 V vs aqueous SCE were able to sustain oxidation of I-/I3 - with a high steady-state quantum yield. For electrodes with very low dye coverages, the open-circuit voltage was mainly determined by the rate of reduction of I2, whereas for high dye coverages, the open-circuit voltage depended on the nature of the complex and on the dye loading level.
| Original language | English |
|---|---|
| Pages (from-to) | 6821-6836 |
| Number of pages | 16 |
| Journal | Journal of Physical Chemistry B |
| Volume | 104 |
| Issue number | 29 |
| Publication status | Published - Jul 27 2000 |
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ASJC Scopus subject areas
- Physical and Theoretical Chemistry
- Engineering(all)
Cite this
Dye sensitization of nanocrystalline titanium dioxide with osmium and ruthenium polypyridyl complexes. / Sauvé, Geneviève; Cass, Marion E.; Coia, George; Doig, Stephen J.; Lauermann, Iver; Pomykal, Katherine E.; Lewis, Nathan S.
In: Journal of Physical Chemistry B, Vol. 104, No. 29, 27.07.2000, p. 6821-6836.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Dye sensitization of nanocrystalline titanium dioxide with osmium and ruthenium polypyridyl complexes
AU - Sauvé, Geneviève
AU - Cass, Marion E.
AU - Coia, George
AU - Doig, Stephen J.
AU - Lauermann, Iver
AU - Pomykal, Katherine E.
AU - Lewis, Nathan S
PY - 2000/7/27
Y1 - 2000/7/27
N2 - A series of osmium polypyridyl complexes having various ground-state reduction potentials has been synthesized and used to sensitize nanoporous titanium dioxide electrodes to solar illumination. The spectral response and current vs potential properties of electrodes modified with these dyes have been compared with the behavior of their ruthenium analogues. The trends can be explained by the differences in absorption spectra and ground-state redox potentials. The osmium, complexes appear to be promising candidates for further optimization in operating photoelectrochemical cells for solar energy conversion applications. Of the materials studied, all complexes having ground-state redox potentials in methanol more positive than ∼0.4 V vs aqueous SCE were able to sustain oxidation of I-/I3 - with a high steady-state quantum yield. For electrodes with very low dye coverages, the open-circuit voltage was mainly determined by the rate of reduction of I2, whereas for high dye coverages, the open-circuit voltage depended on the nature of the complex and on the dye loading level.
AB - A series of osmium polypyridyl complexes having various ground-state reduction potentials has been synthesized and used to sensitize nanoporous titanium dioxide electrodes to solar illumination. The spectral response and current vs potential properties of electrodes modified with these dyes have been compared with the behavior of their ruthenium analogues. The trends can be explained by the differences in absorption spectra and ground-state redox potentials. The osmium, complexes appear to be promising candidates for further optimization in operating photoelectrochemical cells for solar energy conversion applications. Of the materials studied, all complexes having ground-state redox potentials in methanol more positive than ∼0.4 V vs aqueous SCE were able to sustain oxidation of I-/I3 - with a high steady-state quantum yield. For electrodes with very low dye coverages, the open-circuit voltage was mainly determined by the rate of reduction of I2, whereas for high dye coverages, the open-circuit voltage depended on the nature of the complex and on the dye loading level.
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UR - http://www.scopus.com/inward/citedby.url?scp=0034224061&partnerID=8YFLogxK
M3 - Article
VL - 104
SP - 6821
EP - 6836
JO - Journal of Physical Chemistry B
JF - Journal of Physical Chemistry B
SN - 1520-6106
IS - 29
ER -