Study of Long-Term Stability of Ni-Zr 0.92 Y 0.08 O 2-δ |Zr 0.92 Y 0.08 O 2-δ |Ce 0.9 Gd 0.1 O 2-δ |Pr 0.6 Sr 0.4 CoO 3-δ at SOFC and SOEC Mode

Freddy Kukk, Priit Möller, Rait Kanarbik and Gunnar Nurk
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Freddy Kukk: Institute of Chemistry, Faculty of Science and Technology, University of Tartu, 50411 Tartu, Estonia
Priit Möller: Institute of Chemistry, Faculty of Science and Technology, University of Tartu, 50411 Tartu, Estonia
Rait Kanarbik: Institute of Chemistry, Faculty of Science and Technology, University of Tartu, 50411 Tartu, Estonia
Gunnar Nurk: Institute of Chemistry, Faculty of Science and Technology, University of Tartu, 50411 Tartu, Estonia

Energies, 2021, vol. 14, issue 4, 1-16

Abstract: Long term stability is one of the decisive properties of solid oxide fuel cell (SOFC) as well as solid oxide electrolysis cell (SOEC) materials from the commercialization perspective. To improve the understanding about degradation mechanisms solid oxide cells with different electrode compositions should be studied. In this work, Ni-Zr 0.92 Y 0.08 O 2-δ (Ni-YSZ)| Zr 0.92 Y 0.08 O 2-δ (YSZ)|Ce 0.9 Gd 0.1 O 2-δ (GDC)|Pr 0.6 Sr 0.4 CoO 3-δ (PSC) cells are tested in the SOFC regime for 17,820 h at 650 °C, and in the SOEC regime for 860 h at 800 °C. The SOFC experiment showed a degradation speed of 2.4% per 1000 h at first but decreased to 1.1% per 1000 h later. The electrolysis test was performed for 860 h at 800 °C. The degradation speed was 16.3% per 1000 h. In the end of the stability tests, an electrode activity mapping was carried out using a novel 18 O tracing approach. Average Ni grain sizes were measured and correlated with the results of the oxygen isotope maps. Results indicate that Ni coarsening is dependent on solid oxide cell activity. Strontium, chromium and silicon concentrations were also analyzed using the ToF-SIMS method and compared to the electrode activity map, but significant correlation was not observed.

Keywords: SOFC; SOEC; stability; PSC; Cr-poisoning; Ni-coarsening; Si-poisoning (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
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