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Porous nanostructured photoanodes prepared from colloidal solutions of DeGussa or sol−gel processed TiO 2 material have been derivatized with cis- M(dcb) 2 (CN) 2, where M = Ru(II) or Os(II) and dcb is 4,4‘-(COOH) 2 -2,2‘-bipyridine. When employed in a regenerative solar cell with iodide donors, cis- Ru(dcb) 2 (CN) 2 /TiO 2 converts absorbed photons to electrons nearly quantitatively while cis- Os(dcb) 2 (CN) 2 /TiO 2 does not. In-situ time-resolved diffuse reflectance measurements reveal a sluggish iodide oxidation rate is responsible for the low photocurrent efficiency of cis- Os(dcb) 2 (CN) 2 /TiO 2 . Transient absorption measurements support this conclusion and allow full wavelength characterization of the charge-transfer processes.
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Alebbi et al. (1998) studied this question.
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