Skip to content
Home
About Us
Resources
Profiles Metrics
Authors Directory
Institutions Directory
Top Authors
Top Institutions
Top Sponsors
AI Digest
Contact Us
Menu
Home
About Us
Resources
Profiles Metrics
Authors Directory
Institutions Directory
Top Authors
Top Institutions
Top Sponsors
AI Digest
Contact Us
Home
About Us
Resources
Profiles Metrics
Authors Directory
Institutions Directory
Top Authors
Top Institutions
Top Sponsors
AI Digest
Contact Us
Menu
Home
About Us
Resources
Profiles Metrics
Authors Directory
Institutions Directory
Top Authors
Top Institutions
Top Sponsors
AI Digest
Contact Us
Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
materials science
Periodic ab initio study of the hydrogenated rutile TiO
2
(1 1 0) surface
Surface Science, Volume 497, No. 1-3, Year 2002
Notification
URL copied to clipboard!
Description
We have performed periodic ab initio calculations to study the adsorption of hydrogen atoms on TiO2(1 1 0) rutile surface. Two adsorption modes have been considered on slabs. Even if the presence of atomic hydrogen on the surface does not arise from the H2 dissociation, we will refer to the H-H cleavage for the analysis. Hence, in the H mode, the heterolytic cleavage of H2 yields to H+ and H-. The proton interacts with the most basic oxygen atoms of the surface, while H- adsorbs on a metal cation which is the Lewis acidic site. In the R mode, two H+ fix on top of the outer surface anions and two Ti(IV) are reduced to Ti(III). Our calculated adsorption energies values show that the R mode is the most favorable. The surface reduction is only apparent through the spin polarization and does not lead to a full electron charge transfer from the hydrogen atoms to the surface. The change of the electronic state and of the adsorption strength with the slab thickness is presented. Using NH3 as a probe molecule to test the surface acidity, we show that the Ti reduction modifies its reactivity. Surface relaxation significantly contributes to increase the adsorption strengths; however it does not modify the qualitative conclusions. © 2001 Elsevier Science B.V. All rights reserved.
Authors & Co-Authors
Leconte, J.
France, Paris
Laboratoire de Chimie Théorique
Markovits, Alexis
France, Paris
Laboratoire de Chimie Théorique
Skalli, M. K.
France, Paris
Laboratoire de Chimie Théorique
Morocco, Fez
Université Sidi Mohamed Ben Abdellah
Minot, Christian
France, Paris
Laboratoire de Chimie Théorique
Belmajdoub, A.
Morocco, Fez
Faculté Des Sciences Dhar el Mahraz, Université Sidi Mohamed Ben Abdellah
Statistics
Citations: 87
Authors: 5
Affiliations: 3
Identifiers
Doi:
10.1016/S0039-6028(01)01477-7
ISSN:
00396028
Study Approach
Qualitative