2020
DOI: 10.21577/0103-5053.20190123
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Investigating Surface Properties and Lithium Diffusion in Brookite-TiO2

Abstract: Surfaces properties of TiO 2 in the brookite phase and the lithium diffusion are studied using density functional theory (DFT) and interatomic potential simulations. Simulations predict that the brookite surfaces have a higher intrinsic Lewis acidity compared to the other polymorphs due to the presence of four coordinated Ti atoms on the surface in contrast to the most stable surfaces of anatase and rutile which have five coordinated Ti surface atoms. The surface reactivity of the brookite is then expected to … Show more

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Cited by 4 publications
(3 citation statements)
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References 47 publications
(83 reference statements)
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“…However, this does not guarantee that rutile is the best material because intercalation energy, the number of neighboring sites, and hopping distances are also important factors. DFT calculations 76 verified the main observations for Li diffusion on TiO 2 -B (001) found from force field calculations but with a smaller activation barrier (0.73 eV vs. 1.07 eV from force field calculations 75 ). The doping of Li-ion in different intercalation sites of the ( 100) and (001) ultrathin sheets of TiO 2 (B) was theoretically studied by Juan et al 77 On the (100) surface, Li intercalation (0.64 eV) has a higher barrier than Li diffusion (0.26 eV), suggesting that Li atoms prefer to diffuse throughout the widest channels of these systems.…”
Section: Doping Of Main Group Metal On Tio 2 Surfacessupporting
confidence: 77%
“…However, this does not guarantee that rutile is the best material because intercalation energy, the number of neighboring sites, and hopping distances are also important factors. DFT calculations 76 verified the main observations for Li diffusion on TiO 2 -B (001) found from force field calculations but with a smaller activation barrier (0.73 eV vs. 1.07 eV from force field calculations 75 ). The doping of Li-ion in different intercalation sites of the ( 100) and (001) ultrathin sheets of TiO 2 (B) was theoretically studied by Juan et al 77 On the (100) surface, Li intercalation (0.64 eV) has a higher barrier than Li diffusion (0.26 eV), suggesting that Li atoms prefer to diffuse throughout the widest channels of these systems.…”
Section: Doping Of Main Group Metal On Tio 2 Surfacessupporting
confidence: 77%
“…The bulk form of brookite TiO 2 exhibits lattice parameters of a = 9.241 Å, b = 5.489 Å, and c = 5.182 Å. [4] Figure 1 Unit cell of brookite TiO 2 .…”
Section: Resultsmentioning
confidence: 99%
“…Therefore, the exact capability is greater and the density is lower compared with that of the former phases. Among these varied phases of crystal, the greatest steady main phase is rutile, while for nanomaterials [36]. The phase of anatase and brookite are usually more stable than the rutile phase because the surface energy of them is less than that of the rutile.…”
Section: Tio2 Structurementioning
confidence: 99%