%0 Journal Article
%A Liu, Yang
%A Motalov, Vladimir
%A Baumann, Stefan
%A Sergeev, Dmitry
%A Müller, Michael
%A Sohn, Yoo Jung
%A Guillon, Olivier
%T Thermochemical stability of Fe- and Co-functionalized perovskite-type SrTiO3 oxygen transport membrane materials in syngas conditions
%J Journal of the European Ceramic Society
%V 39
%N 15
%@ 0955-2219
%C Amsterdam [u.a.]
%I Elsevier Science
%M FZJ-2019-04633
%P 4874 - 4881
%D 2019
%X The materials typically used for oxygen transport membranes, Ba0.5Sr0.5Co0.8Fe0.2O3−δ (BSCF) and La0.6Sr0.4Co0.2Fe0.8O3 (LSCF) tend to decompose due to their low thermochemical stability under reducing atmosphere. Fe- and Co-doped SrTiO3 (SrTi1-x-yCoxFeyO3-δ, x + y ≤ 0.35) (STCF) materials showing an oxygen transport comparable to LSCF have great potential for application in ion-transport-devices. In this study, the thermochemical stability of pure perovskite-structured STCF was investigated after annealing in a syngas atmosphere at 600–900 °C. The phase composition of the materials after annealing was characterized by means of X-ray diffraction (XRD). The thermodynamic activities of SrO, FeO, and CoO in the STCF materials were evaluated using Knudsen effusion mass spectrometry (KEMS). Co-doped SrTiO3 (STC) materials were not stable after annealing in the syngas atmosphere above 5 mol% Co-substitution. Ruddlesden-Popper-like phases and SrCO3 were detected after annealing at 600 °C. In contrast, Fe substitution (STF) showed good stability after annealing in syngas upto 35 mol% substitution.
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000487569500048
%R 10.1016/j.jeurceramsoc.2019.06.045
%U https://juser.fz-juelich.de/record/865071