Nature and Functionality of La0.58Sr0.4Co0.2Fe0.8O3-δ/ Gd0.2Ce0.8O2-δ/ Y0.16Zr0.84O2-δInterfaces in SOFCs | Zendy

Julian Szász | Zendy; Florian Wankmüller | Zendy; Virginia Wilde | Zendy; Heike Störmer | Zendy; Dagmar Gerthsen | Zendy; Norbert H. Menzler | Zendy; Ellen IversTiffée | Zendy

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Nature and Functionality of La_0.58Sr_0.4Co_0.2Fe_0.8O_3-δ/ Gd_0.2Ce_0.8O_2-δ/ Y_0.16Zr_0.84O_2-δInterfaces in SOFCs

Author(s) -

Julian Szász,

Florian Wankmüller,

Virginia Wilde,

Heike Störmer,

Dagmar Gerthsen,

Norbert H. Menzler,

Ellen IversTiffée

Publication year - 2018

Publication title -

journal of the electrochemical society

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.258

H-Index - 271

eISSN - 1945-7111

pISSN - 0013-4651

DOI - 10.1149/2.0031811jes

Subject(s) - materials science , cathode , yttria stabilized zirconia , anode , scanning electron microscope , electrolyte , microstructure , polarization (electrochemistry) , sintering , analytical chemistry (journal) , electrochemistry , dielectric spectroscopy , scanning transmission electron microscopy , transmission electron microscopy , chemical engineering , ceramic , composite material , electrode , nanotechnology , cubic zirconia , chemistry , chromatography , engineering

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.

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