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Effect of inhomogeneous re-oxidation on Ni-based SOFC oxidation resistance

Kang Lou

Department of Engineering Mechanics, Northwestern Polytechnical University, Xi’an, Shaanxi 710129, P. R. China

E-mail Address: fangou@mail.nwpu.edu.cn

Corresponding author.

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Feng Hui Wang

Department of Engineering Mechanics, Northwestern Polytechnical University, Xi’an, Shaanxi 710129, P. R. China

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Yong Jun Lu

Department of Engineering Mechanics, Northwestern Polytechnical University, Xi’an, Shaanxi 710129, P. R. China

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, and

Xiang Zhao

Department of Engineering Mechanics, Northwestern Polytechnical University, Xi’an, Shaanxi 710129, P. R. China

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https://doi.org/10.1142/S0217979216502003Cited by:3 (Source: Crossref)

Abstract

Inhomogeneous re-oxidation, which causes graded NiO content along anode thickness, has been confirmed to be a key reason for Ni-based cell cracking during redox progress. In this paper, an analytical model is developed to estimate the impact of inhomogeneous re-oxidation on Ni-based solid oxide fuel cell (SOFC) oxidation resistance. And experiments, in which the SOFC was partially re-oxidized, were implemented for model trial. Model results show that electrolyte internal stress can be significantly reduced (from 367 MPa to 135 MPa, when the oxidation degree is 60%), and the electrolyte can remain intact even when the oxidation degree reaches about 70%, if the anode was re-oxidized uniformly. This impact of inhomogeneous re-oxidation on stress in the electrolyte decreases as the anode thickness increases. Scanning electron microscopic (SEM) images of partially oxidized anode cross-sections confirmed that Ni oxidation was inhomogeneous, in which the outer regions of the anode became almost fully oxidized, while the inner regions remained metallic. And the inhomogeneity increases with the redox times. Consequently, it is important to avoid gradients in NiO content during oxidation progress to prevent cell cracking.

Keywords:

PACS: 88.30.pn

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References

1. D. Sarantaridis, R. A. Rudkin and A. Atkinson, J. Power Sources 180, 704 (2008). Web of Science, Google Scholar
2. D. Sarantaridis and A. Atkinson, Fuel Cells 7, 246 (2007). Web of Science, Google Scholar
3. J. L. Young and V. I. Birss, J. Power Sources 196, 7126 (2011). Web of Science, Google Scholar
4. A. Faes et al., J. Power Sources 193, 55 (2009). Web of Science, Google Scholar
5. A. Selçuk and A. Atkinson, J. Am. Ceram. Soc. 83, 2029 (2000). Web of Science, Google Scholar
6. C. H. Hsueh and A. G. Evans, J. Am. Ceram. Soc. 68, 241 (1985). Web of Science, Google Scholar
7. L. B. Freud, J. Cryst. Growth 132, 341 (1993). Web of Science, ADS, Google Scholar
8. N. Zhang and J. Xing, J. Appl. Phys. 100, 103519 (2006). Web of Science, ADS, Google Scholar
9. N. Zhang and J. Chen, J. Appl. Mech. 75, 44503 (2008). Web of Science, Google Scholar
10. N. Zhang and J. Chen, Eur. J. Mech. A Solids 28, 284 (2009). Web of Science, Google Scholar
11. C. H. Hsueh and S. Lee, Compos. B 34, 752 (2003). Web of Science, Google Scholar
12. N. Zhang and J. Chen, Compos. B Eng. 41, 375 (2010). Web of Science, Google Scholar
13. X. Zhao et al., Fuel Cells 14, 1057 (2014). Web of Science, Google Scholar
14. Y. J. Lu et al., to appear in Acta Phys. Sin.-Ch. Ed. 65, 098102 (2016). Web of Science, Google Scholar
15. R. Karmhag, G. A. Niklasson and M. Nygren, J. Mater. Res. 14, 3051 (1999). Web of Science, ADS, Google Scholar
16. D. Waldbillig, A. Wood and D. G. Ivey, Solid State Ion. 176, 847 (2005). Web of Science, Google Scholar
17. M. Pihlatie et al., J. Electrochem. Soc. 1, 1501 (2007). Google Scholar
18. C. Hsueh, J. Cryst. Growth 258, 302 (2003). Web of Science, ADS, Google Scholar
19. Z. Wang et al., Electrochem. Commun. 11, 1123 (2009). Google Scholar
20. A. Faes et al., Membranes 2, 585 (2012). Google Scholar
21. J. Laurencin et al., J. Eur. Ceram. Soc. 28, 1857 (2008). Web of Science, Google Scholar
22. B. Sun, R. A. Rudkin and A. Atkinson, Fuel Cells 9, 805 (2009). Web of Science, Google Scholar
23. J. L. Young, H. Molero and V. I. Birss, J. Power Sources 271, 538 (2014). Web of Science, Google Scholar
24. A. Atkinson and A. Selçuk, Solid State Ion. 134, 59 (2000). Web of Science, Google Scholar
25. J. Kondoh et al., J. Alloys Compd. 365, 253 (2004). Web of Science, Google Scholar
26. M. Ettler et al., J. Power Sources 195, 5452 (2010). Web of Science, Google Scholar