Journal Article

FZJ-2023-02719

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Interdiffusion at electrochemical interfaces between yttria-stabilized zirconia and doped ceria

Schwiers, A. (Corresponding author)FZJ* ; Lenser, C.FZJ* ; Guillon, O.FZJ* ; Menzler, N. H.FZJ*

2023
Elsevier Science Amsterdam [u.a.]

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Please use a persistent id in citations: doi:10.1016/j.jeurceramsoc.2023.06.015  doi:10.34734/FZJ-2023-02719

Abstract: Integration of doped ceria into fuel electrode-supported solid oxide cells is challenging due to high sintering temperatures leading to undesirable interdiffusion between the layers.We investigate the influence of the dopant in ceria X0.1Ce0.9O1.95 (10XDC, X = Y, Gd or Sm) on the interdiffusion with yttria-stabilized zirconia (8YSZ). Powder mixtures of 8YSZ and 10XDC were sintered at temperatures between 1000 and 1400 °C to quantify the phase formation. Interdiffusion in layered systems sintered at 1400 °C was investigated by SEM. Symmetrical Ni-10XDC cells with an 8YSZ electrolyte were analyzed using impedance spectroscopy. Despite small differences in the interdiffusion behavior, different dopants do not lead to significant changes in the cell impedance.Notably, the presence of NiO in the fuel electrode leads to enhanced interdiffusion kinetics of 10XDC with 8YSZ and the formation of porosity at the electrolyte interface. The detrimental influence of these microstructural changes on the electrode performance was investigated.

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Contributing Institute(s):

1. Werkstoffsynthese und Herstellungsverfahren (IEK-1)

Research Program(s):

1. 1231 - Electrochemistry for Hydrogen (POF4-123) (POF4-123)
2. DFG project 275388933 - Entwicklung verbesserter Anoden in oxidkeramischen Brennstoffzellen (SOFC) für die Verstromung von Synthesegas aus der thermochemischen Vergasung von Biomasse (275388933) (275388933)
3. SOFC - Solid Oxide Fuel Cell (SOFC-20140602) (SOFC-20140602)

Appears in the scientific report 2023

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