FIRST-PRINCIPLES MODELING OF OXYGEN INTERACTION WITH ABO 3 -TYPE PEROVSKITE SURFACES
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1 FIRST-PRINCIPLES MODELING OF OXYGEN INTERACTION WITH ABO 3 -TYPE PEROVSKITE SURFACES S. Piskunov, E.A. Kotomin, Yu.F. Zhukovskii, and V. Alexandrov FMNT 2010, Riga, March 17
2 Motivation: Oxygen adsorption on ABO 3 surfaces: - gas sensors, - photocatalysis, - fuel cells, -... Excellent model materials for simulations on more complex perovskite solid solutions.
3 ABO 3 perovskites we study: O B A A = Sr 2+, La 3+ B = Ti 4+, Mn 3+ O = O 2- Oxygen adsorption at (001) surface of: SrTiO 3 LaMnO 3 La Sr MnO 3 (LSM)
4 Computational details Hybrid exchange-correlation functional within DFT E XC E LSDA XC Fock LSDA B88 PWGGA, LYP E E 0.72E 0.81 E 0.2 X X X C B3PW, B3LYP A.D. Becke, J. Chem. Phys. 98 (1993) 1372, Computer code: CRYSTAL ( Method: LCAO(CO)-GTF. Basis sets adopted: SrTiO 3 : S. Piskunov et al., Comp. Mat. Sci. 29 (2004) 165, LaMnO 3, LSM: S. Piskunov et al., Phys. Rev. B 76 (2007) LCAO results have been critically compared with those obtained by means of PBE-GGA PW method (VASP code)
5 Modeling Slab model: Less computationally demanding No spurious interactions Proper boundary conditions For adsorption Super Cell approach have been used Models for simulating surfaces starting from a perfect 3D crystal. (001) slab unit cells periodicaly repeated in x-y plane as adopted in present calculations.
6 Examined adsorption sites (SrTiO 3 (001), top view) Top views of a) TiO 2 - and b) SrO-terminated surfaces with the possible positions for oxygen adsorption.
7 Atomic oxygen adsorption over SrTiO 3 (001): Energy of adsorption 1 system slab Eads Etot Etot 2E 2 O triplet tot Site PW PBE LCAO B3PW TiO 2 -termination Site PW PBE LCAO B3PW SrO-termination Ti Sr O O bridge bridge hollow II hollow Calculated adsorption energies (in ev) in pure DFT plane wave method with the PBE functional (PW-PBE, VASP code) and in the hybrid HF-DFT LCAO method with the B3PW functional (LCAO-B3PW, CRYSTAL code). The adsorbed oxygen atom was considered in the ground (triplet) state.
8 Atomic oxygen adsorption over SrTiO 3 (001): Atomic charge Site PW PBE LCAO B3PW O ads O surf Ti(Sr) surf O ads O surf Ti(Sr) surf TiO 2 -termination O bridge SrO-termination O bridge Effective atomic charges in e (Bader analysis in PW-PBE and Mulliken analysis in LCAO-B3PW) for the adsorbed oxygen atom and the nearest surface O and Ti (or Sr) atoms for optimized adsorption structures of SrTiO 3 (001) substrates. Atomic charges at the pristine surface layer -- PW-PBE: Ti 2.03, O (TiO 2 termination); Sr 1.56, O (SrO termination); LCAO-B3PW: Ti 2.31, O -1.32; Sr 1.84, O
9 Electronic charge redistribution for atomic oxygen atop bridge sites of SrTiO 3 (001) Two-dimensional difference electron density maps for O ads over bridge site at a) TiO 2 - and b) SrO-terminated surfaces. Black, red and blue isolines correspond to the zero, positive and negative values of electron density, respectively.
10 Adsorption of molecular oxygen O 2 in triplet state adsorbs on hollow sites. E ads = 0.02 ev for adsorption on SrO-term. surface, and 0.09 ev if TiO 2 termination is considered. VASP yields 0.25 ev for bridge position. No charge transfer between adsorbate and surface. Distance between surface and adsorbate ~ 3 Å. Invariance of the O 2 bond length. Weak physisorption.
11 ABO 3 adsorption: atomic oxygen Calculated by means of LCAO E ads (in ev) with respect to atomic O Adsorption site atop : SrTiO 3 LaMnO 3 LSM MnO 2 -terminated (001) Mn/Ti * OI OII Hollow I Hollow II La(Sr)O-terminated (001) La Sr O Hollow I Hollow II VASP GGA calculations yield ev (Kotomin et al., PCCP 2008, 10, 4644) Adsorption sites: (a) MnO 2 - and (b) La(Sr)O-term. Hatched atoms are from subsurface atomic plane.
12 Energy of adsorption (in ev): 2E ads E slab adsorbate tot Calculated E ads (in ev) ABO 3 adsorption: molecular oxygen E slab tot 2E O2 tot Adsorption site atop : MnO 2 -terminated (001) O 2 /LSM Mn -1.41* Vacancy I La(Sr)O-terminated (001) (E vac = 2.21) Hollow II Vacancy I * VASP GGA calculations yield ev for O 2 /LaMnO 3 (001) atop Mn (Kotomin et al., PCCP 2008, 10, 4644) (E vac = 3.79) E O 2 diss = 5.30 ev vs ev in exp. Adsorption sites: (a) MnO 2 - and (b) La(Sr)O-term. Hatched atoms are from subsurface atomic plane.
13 Energetically favorable O 2 adsorption on LSM(001) Δq O2 = e E ads = ev Δq O2 = e E ads = ev
14 Summary and conclusions The most favorable oxygen adsorption sites are bridge positions for SrTiO 3 (001) and Mn and hollow sites for MnO 2 - and La(Sr)O-terminated LaMnO 3 /LSM(001), respectively. O ads tends to form peroxide ion with surface oxygen for SrTiO 3 (001), while Mn dangling bond is saturated by O ads for LaMnO3/LSM(001). Only weak physisorption is predicted for O 2 in case of SrTiO 3 (001). O 2 is chemisorbed atop LaMnO 3 /LSM(001). Much more mobile surface oxygen vacancies (activation energy 0.14 ev vs. ~1 ev for O ads diffusion along (001)) are responsible for ionic transport along surface.
15 Acknowledgements J. Maier, E. Spohr, E. Heifets, R. Merkle, and Yu. Mastrikov For the many fruitful discussions! Eiropas Sociālā fonda projekts Datorzinātnes pielietojumi un tās saiknes ar kvantu fiziku Nr.2009/0216/1DP/ /09/APIA/VIAA/044 For the financial support!
16 Many Thanks For Your Attention!
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