Transient Absorption Spectroscopy of Anatase and Rutile: The Impact of Morphology and Phase on Photocatalytic Activity
By Xiuli Wang, A. Kafizas, Xiaoe Li, S. Moniz, P. J. T. Reardon, Junwang Tang, I. Parkin, J. Durrant. 2015
144 citations recorded by the source corpus.
We employed transient absorption spectroscopy (TAS) to investigate the kinetic dependences of photocatalysis in anatase and rutile TiO2 films of varying morphology. In mesoporous films, anatase was ∼30 times more efficient than rutile in the photocatalytic degradation of an intelligent ink model system. Independent of phase, up to 100 lower levels of photocatalysis were found in dense films. Charge carrier lifetimes were probed by TAS on the microsecond to second time scale. For both rutile and anatase, recombination was independent of morphology. Rutile exhibited up to 10 times slower recombination kinetics than anatase. Efficient, irreversible hole scavenging by alcohols was present in mesoporous anatase alone, resulting in the generation of long-lived electrons (τ ≈ 0.7 s) which, upon the addition of the dye reduction target resazurin, enabled efficient electron transfer (τ ≈ 3 ms). Hole scavenging by alcohols on mesoporous rutile was substantially less efficient and more reversible than anatase, resul...
Subfields: Renewable Energy, Sustainability and the Environment, Water Science and Technology
View Paper: https://www.semanticscholar.org/paper/1188b5a672d103ed67998ecbf1faeec44f71a2ba
How researchers see this paper
The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.
In Renewable Energy, Sustainability and the Environment
Citations in the corpus
- The synthesis strategies and photocatalytic performances of TiO2/MOFs composites: A state-of-the-art review (2020, background): “The active specie scavenger experiments were designed to investigate the charge transfer direction between NH2–UiO66 and anatase phase nanofibers (T), in which methanol and AgNO3 (aq) were selected to act as hole and electron scavengers [343], respectively.”