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Volumn 25, Issue 2 PART 3, 2009, Pages 2753-2760

Oxygen incorporation reaction into mixed conducting perovskites: A mechanistic analysis for (La,Sr)MnO3 based on DFT calculations

Author keywords

[No Author keywords available]

Indexed keywords

DFT CALCULATION; HYPOTHETICAL MECHANISM; MECHANISTIC ANALYSIS; OXYGEN INCORPORATION; RATE DETERMINING STEP; SURFACE OXYGEN VACANCIES; TRANSITION STATE;

EID: 77649096656     PISSN: 19385862     EISSN: 19386737     Source Type: Conference Proceeding    
DOI: 10.1149/1.3205836     Document Type: Conference Paper
Times cited : (9)

References (29)
  • 11
    • 77649089248 scopus 로고    scopus 로고
    • S. Piskunov, Y. F. Zhukovskii, E. A. Kotomin, E. Heifets and D. E. Ellis, MRS Symp. Proc., 894, LL08-05 (2006).
    • S. Piskunov, Y. F. Zhukovskii, E. A. Kotomin, E. Heifets and D. E. Ellis, MRS Symp. Proc., 894, LL08-05 (2006).
  • 13
    • 0002828241 scopus 로고    scopus 로고
    • vö given in R. A. De Souza and J. A. Kilner, Solid State Ionics, 106, 175 (1998).
    • vö given in R. A. De Souza and J. A. Kilner, Solid State Ionics, 106, 175 (1998).
  • 14
    • 77649164604 scopus 로고    scopus 로고
    • Calculations for the dissociation transition state on the fully relaxed orthorhombic MnO2[001] surface are in progress. Preliminary calculations for the transition state on the cubic MnO2[001] surface (with frozen lattice atom positions) yield a barrier height for the dissociation transition state of 1.4 eV relative to the tilted adsorbed superoxide O 2. In this transition state the molecular oxygen adsorbate is located on top of a surface oxygen ion such that the O-O bond is parallel to the Mn-O-Mn bonds in the surface layer. The O-O bond is elongated to 1.50 Å. Simultaneously the distance to the next surface Mn ions is already as short as Mn-O bulk distances which leads to a perceptible energy gain, but the Mn-O ad bond is inclined by 52° relative to the surface plane
    • ad bond is inclined by 52° relative to the surface plane.
  • 27
    • 77649138784 scopus 로고    scopus 로고
    • ö mobility for BSCF makes its contribution dominant and consequently also accelerates the overall rate.
    • ö mobility for BSCF makes its contribution dominant and consequently also accelerates the overall rate.
  • 29
    • 77649173788 scopus 로고    scopus 로고
    • At first glance it may seem surprising that despite the high vacancy concentration the direct adsorption of O2 into a surface vacancy (rate determining step of M1) is still slower than the encounter of O 2- or O22- and Vö (rate determining step of M3, However, the high vacancy concentration also accelerates the O2- or O22- and Vö encounter (the average distance between adsorbates and V ö is only ≈ 5.7 Å, i.e. the length of two Vö jumps, and the additional increase of Vö mobility then results in M3 being faster than M1. A decrease of DVö sufr by one order of magnitude (or a significant increase of the adsorption sticking coefficient) would invert the relative sequence of reaction rates while still resulting in a high absolute rate
    • sufr by one order of magnitude (or a significant increase of the adsorption sticking coefficient) would invert the relative sequence of reaction rates while still resulting in a high absolute rate.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.