The limiting role of iodide oxidation in cis-Os(dcb){sub 2}(CN){sub 2}/TiO{sub 2} photoelectrochemical cells
- Centro di Studio su Fotoreattivita e Catalisi CNR, Ferrara (Italy). Dept. di Chimica dell`Univ.
- Johns Hopkins Univ., Baltimore, MD (United States). Dept. of Chemistry
Porous nanostructured photoanodes prepared from colloidal solutions of DeGussa or sol-gel processed TiO{sub 2} material have been derivatized with cis-M(dcb){sub 2}(CN){sub 2}, where M = Ru(II) or Os(II) and dcb is 4,4{prime}-(COOH){sub 2}-2,2{prime}-bipyridine. When employed in a regenerative solar cell with iodide donors, cis-Ru(dcb){sub 2}(CN){sub 2}/TiO{sub 2} converts absorbed photons to electrons nearly quantitatively while cis-Os(dcb){sub 2}(CN){sub 2}/TiO{sub 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){sub 2}(CN){sub 2}/TiO{sub 2}. Transient absorption measurements support this conclusion and allow full wavelength characterization of the charge-transfer processes.
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- OSTI ID:
- 655388
- Journal Information:
- Journal of Physical Chemistry B: Materials, Surfaces, Interfaces, amp Biophysical, Vol. 102, Issue 39; Other Information: PBD: 24 Sep 1998
- Country of Publication:
- United States
- Language:
- English
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