TY  - JOUR
AU  - Liu, Yang
AU  - Motalov, Vladimir
AU  - Baumann, Stefan
AU  - Sergeev, Dmitry
AU  - Müller, Michael
AU  - Sohn, Yoo Jung
AU  - Guillon, Olivier
TI  - Thermochemical stability of Fe- and Co-functionalized perovskite-type SrTiO3 oxygen transport membrane materials in syngas conditions
JO  - Journal of the European Ceramic Society
VL  - 39
IS  - 15
SN  - 0955-2219
CY  - Amsterdam [u.a.]
PB  - Elsevier Science
M1  - FZJ-2019-04633
SP  - 4874 - 4881
PY  - 2019
AB  - 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.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000487569500048
DO  - DOI:10.1016/j.jeurceramsoc.2019.06.045
UR  - https://juser.fz-juelich.de/record/865071
ER  -