2022
DOI: 10.1002/admi.202201434
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Surface Space‐Charge Potential and Oxygen Surface Exchange Coefficient of SrTiO3: The Effect of Surface Orientation

Abstract: 18O2/16O2 exchange experiments on terminated (100), (110), and (111) oriented samples of single‐crystal SrTiO3 are used to study the effect of surface orientation on the oxygen surface exchange coefficient kO∗\[k_{\rm{O}}^*\] and the surface space‐charge potential Φ0. Isotope exchanges are carried out at temperatures 922 < T/K < 1073 at an oxygen activity aO2 = 0.2 in dry conditions (aH2O < 10−7.7); isotope profiles are measured subsequently by secondary ion mass spectrometry. Isothermal kO∗$k_{\rm{O}}^*$ valu… Show more

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Cited by 3 publications
(4 citation statements)
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“…As shown in Supplementary Fig. 6 , the bulk diffusion coefficient ( D *) for VA and non-VA STO substrates were found to be 1.2×10 −10 and 3.1 × 10 −11 cm 2 s −1 , respectively, in agreement with previously reported values 51 , 52 .…”
Section: Resultssupporting
confidence: 90%
“…As shown in Supplementary Fig. 6 , the bulk diffusion coefficient ( D *) for VA and non-VA STO substrates were found to be 1.2×10 −10 and 3.1 × 10 −11 cm 2 s −1 , respectively, in agreement with previously reported values 51 , 52 .…”
Section: Resultssupporting
confidence: 90%
“…The effect of crystal orientation on the OER rates has been investigated for various materials, such as SrTiO 3 , , Ruddlesden–Popper class materials (La 1.85 Sr 0.15 CuO 4−δ and Nd 2 NiO 4+δ ) , or La,Sr-based perovskites (La 1– x Sr x Co 1– y Fe y O 3−δ and La 1– x Sr x MnO 3−δ ). In general, all studies agree that (001) surfaces exhibit the lowest catalytic activity. For other orientations (usually (110)- and (111)-oriented surfaces were investigated), the different studies yielded ambivalent results and various underlying reasons for different kinetics on specific crystal orientations, in particular the importance of the surface chemistry (reconstructions, vacancy concentrations, O 2 adsorption energies, and polarity), as well as the impact of strain and morphology have been emphasized.…”
Section: Introductionmentioning
confidence: 96%
“…Thus, systematic studies of the effects of crystal orientations on the oxygen exchange kinetics (especially for perovskites) are difficult, at least by electrical measurements, and the understanding of the underlying mechanics is limited. The effect of crystal orientation on the OER rates has been investigated for various materials, such as SrTiO 3 , 29,30 Ruddlesden−Popper class materials (La 1.85 Sr 0.15 CuO 4−δ and N d 2 N i O 4 + δ ) 3 1 , 3 2 o r L a , S r -b a s e d p e r o v s k i t e s (La 1−x Sr x Co 1−y Fe y O 3−δ and La 1−x Sr x MnO 3−δ ). 33−37 In general, all studies agree that (001) surfaces exhibit the lowest catalytic activity.…”
Section: ■ Introductionmentioning
confidence: 99%
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