Effect of the anchoring group in Ru-bipyridyl sensitizers on the photoelectrochemical behavior of dye-sensitized TiO2 electrodes: Carboxylate versus phosphonate linkages
SCIE
SCOPUS
- Title
- Effect of the anchoring group in Ru-bipyridyl sensitizers on the photoelectrochemical behavior of dye-sensitized TiO2 electrodes: Carboxylate versus phosphonate linkages
- Authors
- Park, H; Bae, E; Lee, JJ; Park, J; Choi, W
- Date Issued
- 2006-05-04
- Publisher
- AMER CHEMICAL SOC
- Abstract
- The effects of the number of anchoring groups (carboxylate vs phosphonate) in Ru-bipyridyl complexes on their binding to TiO2 surface and the photoelectrochemical performance of the sensitized TiO2 electrodes were systematically investigated. Six derivatives of Ru-bipyridyl complexes having di-, tetra-, or hexacarboxylate (C2, C4, and C6) and di-, tetra-, or hexaphosphonate (P2, P4, and P6) as the anchoring group were synthesized. The properties and efficiencies of C- and P-complexes as a sensitizer depended on the number of anchoring groups in very different ways. Although C4 exhibited the lowest visible light absorption, C-4-TiO2 electrode showed the best cell performance and stability among C-TiO2 electrodes. However, P6, which has the highest visible light absorption, was more efficient than P2 and P4 as a sensitizer of TiO2. The surface binding (strength and stability) of C-complexes on TiO2 is highly influenced by the number of carboxylate groups and is the most decisive factor in controlling the sensitization efficiency. A phosphonate anchor, however, can provide a stronger chemical linkage to TiO2 surface, and the overall sensitization performance was less influenced by the adsorption capability of P-complexes. The apparent effect of the anchoring group number on the P-complex sensitization seems to be mainly related with the visible light absorption efficiency of each P-complex.
- Keywords
- (2,2' -BIPYRIDYL-4,4' -DICARBOXYLIC ACID)RUTHENIUM(II) COMPLEXES; NANOSTRUCTURED SEMICONDUCTOR PHOTOELECTRODES; NANOCRYSTALLINE TIO2; SOLAR-CELLS; TITANIUM-DIOXIDE; POTENTIAL CHARACTERISTICS; RUTHENIUM(II) COMPLEXES; POLYPYRIDYL COMPLEXES; CURRENT-DENSITY; VISIBLE-LIGHT
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/24042
- DOI
- 10.1021/JP060397E
- ISSN
- 1520-6106
- Article Type
- Article
- Citation
- JOURNAL OF PHYSICAL CHEMISTRY B, vol. 110, no. 17, page. 8740 - 8749, 2006-05-04
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