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• W3201427517 abstract "We studied the role of iso-valent heteroatoms replacing Ti4+ cations in the lattice of two titania polymorphs, rutile (r-) and anatase (a-) by means of first principles calculations. The r-TiO2(110) and the a-TiO2(101) surfaces have been considered and Ti ions in the bulk, sub-surface, and surface sites have been replaced with Si, Ge, Sn, Pb, Zr, Hf, and Ce ions: surface or sub-surface sites are clearly preferred. Since the dopants have the same number of valence electrons as the replaced Ti atom, they can have only two effects: one is steric, related to the different size of the dopant compared to Ti4+; the other is an orbital effect, due to the energy levels associated to the dopant not present on the pristine surface. Both these effects can modify locally the geometric and electronic structure of the surface, in particular by introducing new states in the band gap. To check the effect of the dopants on the surface reactivity we studied as an example the decomposition of HCOOH which can follow four different paths with desorption of (a) H2, (b) CO, (c) H2O, or (d) CO2. The results show the very different behavior of the two titania polymorphs considered, rutile and anatase: rutile is more reactive and more easily reduced than anatase. For specular reasons, the presence of the dopants has in general more pronounced effects on anatase, as they can deeply modify the surface reactivity and the HCOOH decomposition path." @default.
• W3201427517 created "2021-09-27" @default.
• W3201427517 creator A5008109734 @default.
• W3201427517 creator A5018929838 @default.
• W3201427517 date "2021-09-29" @default.
• W3201427517 modified "2023-10-03" @default.
• W3201427517 title "Iso-valent doping of reducible oxides: a comparison of rutile (110) and anatase (101) TiO₂ surfaces" @default.
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• W3201427517 doi "https://doi.org/10.1088/1361-648x/ac268e" @default.
• W3201427517 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/34521076" @default.
• W3201427517 hasPublicationYear "2021" @default.
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