Matches in SemOpenAlex for { <https://semopenalex.org/work/W30958384> ?p ?o ?g. }
Showing items 1 to 82 of
82
with 100 items per page.
- W30958384 abstract "The photostability of the sensitizer dye [Ru(dcbpyH)2(NCS)2] (Bu4N)2 (referred to as N719) was investigated in a simple model system instead of a complete nanocrystaline dye sensitized titanium dioxide solar cells (nc-DSSC). The applied model system consisted of N719 dyed titanium dioxide nanoparticles, suspended in a cuvette containing acetonitrile as the solvent which were illuminated with 532/525 nm monochromatic light of different light intensity. Under these experimental conditions and in the absence of any redox couple as a regenerative electron donor, the number of mole of photodegradation products: [RuL2(CN)2], [RuL2(NCS)(CN)] and [RuL2(NCS)(ACN)] increased almost linearly as a function of increasing mole of absorbed photons. The total quantum yields of these degradation products, Φdeg showed light intensity dependence, being higher at low light intensities and smaller at higher intensities. This light intensity dependency of the quantum yield was attributed to the back electron transfer reaction rate between the titanium dioxide conduction band electrons and the oxidized dye cation. Photoinduced absorption spectroscopy (PIA) was used to measure the back electron transfer reaction rate, kback at the same light intensities as used in the model experiments. The PIA measurements showed that kback increased with increasing light intensities. By applying the equation kdeg = Φdeg × kback to the experimentally obtained total quantum yields and back electron transfer rates it was possible to calculate an average value for the oxidative degradation rate of the N719 dye attached to the TiO2 nanoparticles, kdeg = 4 × 10 s . Heating and illumination of the model system in the presence of 4-tert-butylpyridine (4-TBP), the commonly used additive in nc-DSSC, revealed the possible involvement of the dye in a substitution reaction with 4-TBP with the formation of the substitution product [Ru(dcbpyH)2(NCS)(4-TBP)] , Bu4N. It was also found that the amount of the additive substituted product formed under illumination increases upon adsorption of the dye on TiO2 nanoparticles. Quantum yield measurements of the substitution product under different experimental conditions directed us to conclude that the main part of the substitution product is formed through the oxidized state of the dye, S. The quantum yield of the substitution reaction initiated from the dye oxidized state was φsub (TiO2) = 7.1 × 10 . Based on this value the rate of the photosubstitution reaction was calculated to be ksub(TiO2) = 0.07 Ms. The influence of the photosubstitution reaction on the N719 dye lifetime was discussed based on the ksub(TiO2 ) value and the literature values of the dye regeneration reaction, kreg between the oxidized dye, S and iodide." @default.
- W30958384 created "2016-06-24" @default.
- W30958384 creator A5085637354 @default.
- W30958384 date "2005-01-01" @default.
- W30958384 modified "2023-09-27" @default.
- W30958384 title "Photostability of the solar cell dye sensitizer N719: electrochemical synthesis of some arylsulfones and aminobenzoquinones" @default.
- W30958384 cites W639712606 @default.
- W30958384 hasPublicationYear "2005" @default.
- W30958384 type Work @default.
- W30958384 sameAs 30958384 @default.
- W30958384 citedByCount "0" @default.
- W30958384 crossrefType "journal-article" @default.
- W30958384 hasAuthorship W30958384A5085637354 @default.
- W30958384 hasConcept C113196181 @default.
- W30958384 hasConcept C120665830 @default.
- W30958384 hasConcept C121332964 @default.
- W30958384 hasConcept C123669783 @default.
- W30958384 hasConcept C147789679 @default.
- W30958384 hasConcept C161790260 @default.
- W30958384 hasConcept C162847780 @default.
- W30958384 hasConcept C171001562 @default.
- W30958384 hasConcept C17525397 @default.
- W30958384 hasConcept C178790620 @default.
- W30958384 hasConcept C185592680 @default.
- W30958384 hasConcept C191897082 @default.
- W30958384 hasConcept C192562407 @default.
- W30958384 hasConcept C2777463227 @default.
- W30958384 hasConcept C2777593239 @default.
- W30958384 hasConcept C3020368824 @default.
- W30958384 hasConcept C48421929 @default.
- W30958384 hasConcept C65165184 @default.
- W30958384 hasConcept C68801617 @default.
- W30958384 hasConcept C75473681 @default.
- W30958384 hasConcept C91881484 @default.
- W30958384 hasConceptScore W30958384C113196181 @default.
- W30958384 hasConceptScore W30958384C120665830 @default.
- W30958384 hasConceptScore W30958384C121332964 @default.
- W30958384 hasConceptScore W30958384C123669783 @default.
- W30958384 hasConceptScore W30958384C147789679 @default.
- W30958384 hasConceptScore W30958384C161790260 @default.
- W30958384 hasConceptScore W30958384C162847780 @default.
- W30958384 hasConceptScore W30958384C171001562 @default.
- W30958384 hasConceptScore W30958384C17525397 @default.
- W30958384 hasConceptScore W30958384C178790620 @default.
- W30958384 hasConceptScore W30958384C185592680 @default.
- W30958384 hasConceptScore W30958384C191897082 @default.
- W30958384 hasConceptScore W30958384C192562407 @default.
- W30958384 hasConceptScore W30958384C2777463227 @default.
- W30958384 hasConceptScore W30958384C2777593239 @default.
- W30958384 hasConceptScore W30958384C3020368824 @default.
- W30958384 hasConceptScore W30958384C48421929 @default.
- W30958384 hasConceptScore W30958384C65165184 @default.
- W30958384 hasConceptScore W30958384C68801617 @default.
- W30958384 hasConceptScore W30958384C75473681 @default.
- W30958384 hasConceptScore W30958384C91881484 @default.
- W30958384 hasLocation W309583841 @default.
- W30958384 hasOpenAccess W30958384 @default.
- W30958384 hasPrimaryLocation W309583841 @default.
- W30958384 hasRelatedWork W1730506601 @default.
- W30958384 hasRelatedWork W1966833645 @default.
- W30958384 hasRelatedWork W1967863392 @default.
- W30958384 hasRelatedWork W2000929481 @default.
- W30958384 hasRelatedWork W2018809852 @default.
- W30958384 hasRelatedWork W2021460237 @default.
- W30958384 hasRelatedWork W2024159230 @default.
- W30958384 hasRelatedWork W2036111911 @default.
- W30958384 hasRelatedWork W2058824307 @default.
- W30958384 hasRelatedWork W2063225588 @default.
- W30958384 hasRelatedWork W2087656054 @default.
- W30958384 hasRelatedWork W2089230840 @default.
- W30958384 hasRelatedWork W2091190521 @default.
- W30958384 hasRelatedWork W2098987095 @default.
- W30958384 hasRelatedWork W2213908163 @default.
- W30958384 hasRelatedWork W2473903844 @default.
- W30958384 hasRelatedWork W2952107533 @default.
- W30958384 hasRelatedWork W2997064597 @default.
- W30958384 hasRelatedWork W3167092332 @default.
- W30958384 hasRelatedWork W2786958448 @default.
- W30958384 isParatext "false" @default.
- W30958384 isRetracted "false" @default.
- W30958384 magId "30958384" @default.
- W30958384 workType "article" @default.