Photostability of phosphonate-derivatized, Ru(II) polypyridyl complexes on metal-oxide surfaces

Hanson, Keneth, Brennaman, M. Kyle, Luo, Hanlin, Glasson, Christopher R.K., Concepcion, Javier J., Song, Wenjing, and Meyer, Thomas J. (2012) Photostability of phosphonate-derivatized, Ru(II) polypyridyl complexes on metal-oxide surfaces. Applied Materials and Interfaces, 4 (3). pp. 1462-1469.

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Abstract

The photostability of [RuII(bpy)2(4,4'-(PO3H2)2bpy)]Cl2 (bpy = 4,4'-bipyridine) on nanocrystalline TiO2 and ZrO2 films was investigated using a standard measurement protocol. Stability was evaluated by monitoring visible light absorbance spectral changes, in real time, during 455 nm photolysis (30 nm fwhm, 475 mW/cm2) in a variety of conditions relevant to dye-sensitized solar cells and dye-sensitized photoelectrosynthesis cells. Desorption (kdes) and photochemical (kchem) processes were observed and found to be dependent upon solvent, anion, semiconductor, and presence of oxygen. Both processes are affected by oxygen with kdes and kphoto noticeably smaller in argon saturated solution. Desorption was strongly solvent and pH dependent with desorption rates increasing in the order: methanol (MeOH) ≈ acetonitrile (MeCN) < propylene carbonate (PC) < pH 1 pH 7. Photochemistry occurred in MeOH and PC but not in aqueous, 0.1 M HClO4 and MeCN. The anion and solvent dependence of kphoto strongly suggests the photoreaction involves ligand substitution initiated by population of metal centered d-d states. The relative stability of −PO3H2- versus −COOH-substituted [RuII(bpy)3]2+ was also quantitatively established.

Item ID: 33454
Item Type: Article (Refereed Research - C1)
Keywords: dye-sensitized solar cell (DSSC), dye-sensitized photoelectrosynthesis cell (DSPEC), ruthenium polypyridine, photostability, desorption, photochemistry
ISSN: 1944-8252
Funders: US Department of Energy (DOE)
Projects and Grants: DOE Award DESC0001011, DOE Award DE-SC000129, DOE Award DE-EE0003188
Date Deposited: 29 May 2014 04:09
FoR Codes: 03 CHEMICAL SCIENCES > 0302 Inorganic Chemistry > 030207 Transition Metal Chemistry @ 50%
03 CHEMICAL SCIENCES > 0305 Organic Chemistry > 030503 Organic Chemical Synthesis @ 50%
SEO Codes: 85 ENERGY > 8505 Renewable Energy > 850504 Solar-Photovoltaic Energy @ 50%
97 EXPANDING KNOWLEDGE > 970103 Expanding Knowledge in the Chemical Sciences @ 50%
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