TY  - JOUR
AU  - Szász, Julian
AU  - Wankmüller, Florian
AU  - Wilde, Virginia
AU  - Störmer, Heike
AU  - Gerthsen, Dagmar
AU  - Menzler, Norbert H.
AU  - Ivers-Tiffée, Ellen
TI  - Nature and functionality of La0.58Sr0.4Co0.2Fe0.8O3-delta/Gd0.2Ce0.8O2-delta/Y0.16Zr0.84O2-delta interfaces in SOFCs
JO  - Journal of the Electrochemical Society
VL  - 165
IS  - 10
SN  - 1945-7111
CY  - Pennington, NJ
PB  - Electrochemical Soc.
M1  - FZJ-2018-04657
SP  - F898 - F906
PY  - 2018
AB  - Interdiffusion phenomena and secondary phase formation at the interface La0.58Sr0.4Co0.2Fe0.8O3-δ (LSCF) / Gd0.2Ce0.8O2-δ (GDC) / Y0.16Zr0.84O2-δ (YSZ) are correlated to linear and non-linear losses in symmetrical and full SOFC cells. FIB/SEM (focussed ion beam / scanning electron microscopy) tomography is applied for determining the local distribution of the primary phases LSCF, GDC, and YSZ and elemental analysis via STEM/EDXS (scanning transmission electron microscopy / energy dispersive X-ray spectroscopy) provides information on the secondary phase SrZrO3 (SZO) and the interdiffusion between GDC and YSZ (ID). This reveals the effect of GDC co-sintering temperature (varied from 1100°C to 1400°C), alongside the sintering of LSCF at 1080°C, on these multi-layered microstructures. Electrochemical impedance spectra on symmetrical cells show that the polarization resistance (ASRcat) of the cathode/electrolyte interface is pronouncedly affected by three orders of magnitude, changing the overall power density of anode supported SOFC single cells at 0.8V by as much as a factor of 20. In conclusion, the chemical composition of the ID has a tremendous impact on the electrochemical efficiency of the investigated LSCF/GDC/YSZ interface, and processing parameters of anode supported cells with LSCF cathode have to be carefully chosen for individual SOFC cell concepts.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000441061800118
DO  - DOI:10.1149/2.0031811jes
UR  - https://juser.fz-juelich.de/record/850926
ER  -