TY  - JOUR
AU  - Häffelin, A.
AU  - Niedrig, C.
AU  - Wagner, S. F.
AU  - Baumann, Stefan
AU  - Meulenberg, Wilhelm Albert
AU  - Ivers-Tiffée, E.
TI  - Three-Dimensional Performance Model for Oxygen Transport Membranes
JO  - Journal of the Electrochemical Society
VL  - 161
IS  - 14
SN  - 0013-4651
CY  - Pennington, NJ
PB  - Electrochemical Soc.
M1  - FZJ-2014-05265
SP  - F1409-F1415
PY  - 2014
AB  - A three-dimensional finite element method (FEM) model that enables the performance simulation of mixed ionic-electronic conducting (MIEC) oxygen transport membranes (OTM) has been developed. In order to evaluate the influence of a porous functional layer on the membrane performance a numerical geometry generator was implemented that allows to create arbitrary porous microstructures. The 3D OTM model includes the spatially coupled physicochemical processes i) gas diffusion in the porous functional layer, ii) oxygen exchange at the feed-side between gas phase and MIEC material, iii) oxygen ion diffusion across the membrane, iv) oxygen excorporation at the permeate-side. The performed simulation carried out for the state-of-the-art MIEC composition La0.6Sr0.4Co0.2Fe0.8O3−δ (LSCF) was validated with the help of oxygen permeation measurements carried out on an asymmetric LSCF thin-film OTM in the temperature range of 750…1000°C. The simulation results identified a surface exchange dominated regime for membrane thicknesses below 50 μm. While the application of a porous functional layer on the feed side could only increase the permeation flux by around 26%, the model demonstrates the significant improvement by a factor of two (for the given conditions) that can be achieved with a functional layer on the permeate side in case of a 20 μm thin-film membrane. 
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000345975500092
DO  - DOI:10.1149/2.0601414jes
UR  - https://juser.fz-juelich.de/record/171695
ER  -