Dye sensitization of nanocrystalline titanium dioxide with osmium and ruthenium polypyridyl complexes

Geneviève Sauvé, Marion E. Cass, George Coia, Stephen J. Doig, Iver Lauermann, Katherine E. Pomykal, Nathan S Lewis

Research output: Contribution to journalArticle

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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 languageEnglish
Pages (from-to)6821-6836
Number of pages16
JournalJournal of Physical Chemistry B
Volume104
Issue number29
Publication statusPublished - Jul 27 2000

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Osmium
Ruthenium
osmium
titanium oxides
Titanium dioxide
ruthenium
Coloring Agents
Dyes
dyes
Ground state
Open circuit voltage
open circuit voltage
Electrodes
ground state
electrodes
Photoelectrochemical cells
solar energy conversion
Quantum yield
spectral sensitivity
Energy conversion

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Engineering(all)

Cite this

Sauvé, G., Cass, M. E., Coia, G., Doig, S. J., Lauermann, I., Pomykal, K. E., & Lewis, N. S. (2000). Dye sensitization of nanocrystalline titanium dioxide with osmium and ruthenium polypyridyl complexes. Journal of Physical Chemistry B, 104(29), 6821-6836.

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 journalArticle

Sauvé, G, Cass, ME, Coia, G, Doig, SJ, Lauermann, I, Pomykal, KE & Lewis, NS 2000, 'Dye sensitization of nanocrystalline titanium dioxide with osmium and ruthenium polypyridyl complexes', Journal of Physical Chemistry B, vol. 104, no. 29, pp. 6821-6836.
Sauvé G, Cass ME, Coia G, Doig SJ, Lauermann I, Pomykal KE et al. Dye sensitization of nanocrystalline titanium dioxide with osmium and ruthenium polypyridyl complexes. Journal of Physical Chemistry B. 2000 Jul 27;104(29):6821-6836.
Sauvé, Geneviève ; Cass, Marion E. ; Coia, George ; Doig, Stephen J. ; Lauermann, Iver ; Pomykal, Katherine E. ; Lewis, Nathan S. / Dye sensitization of nanocrystalline titanium dioxide with osmium and ruthenium polypyridyl complexes. In: Journal of Physical Chemistry B. 2000 ; Vol. 104, No. 29. pp. 6821-6836.
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