Studies of Half-Cell for Anode Supported SOFC after Reduction

Abstract:

The performance of half-cell for anode supported Solid Oxide Fuel Cells (SOFCs) is necessary to wide use of SOFCs. This work is to study the reduction degree of anode and the residual stress changes that occur during hydrogen reduction on the different temperatures and in different times. The porosity of the specimens with oxidation is less than that of the reduction one. There is no Ni phase in the sample before hydrogen reduction. After hydrogen reduction on 1000°C for 6 hours, there is no NiO phase in the sample. It reveals the NiO has been reduced into Ni completely. We also investigate residual stresses in the electrolyte layer using X-ray diffraction. The residual stress value of electrolyte is about -844.1MPa before reduction. After hydrogen reduction on 800°C for 9 hours, the residual stress is decreased to -474.8MPa. So the reduction temperature can choose as 600°C and the reduction time can choose as 9 hours.

• Periodical: Advanced Materials Research (Volumes 287-290)
• Pages: 2511-2515
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.287-290.2511
• Online since: July 2011
• Authors: Xia Wang, Feng Hui Wang
• Keywords: Half-Cell for Anode Supported SOFC, Reduction, X-Ray Diffraction (XRD)

References

[1] Julie Villanova, Olivier Sicardy, Roland Fortunier, Jean-Sébastien Micha, Pierre Bleuetb: Determination of global and local residual stresses in SOFC by X-ray diffraction, Nuclear Instruments and Methods in Physics Research B, Vol.268 (2010), p.282–286.

DOI: 10.1016/j.nimb.2009.09.017

[2] Xianshuang Xin, Zhe Lü, Xiqiang Huang, Xueqing Sha, Yaohui Zhang, Wenhui Su: Anode-supported solid oxide fuel cell based on dense electrolyte membrane fabricated by filter-coating, Journal of Power Sources, Vol.159 (2006), p.1158–1161

DOI: 10.1016/j.jpowsour.2005.12.015

[3] Lara-Curzio E, Watkins TR, Trejo R, Luttrell CR, Radovic M, Lannutti J, et al: Effect of temperature and H2-induced reduction on the magnitude of residual stresses in YSZ-NiO/YSZ bi-layers. In: 106th annual meeting and exposition of the American Ceramic Society, Indianapolis (2004)

DOI: 10.1002/9780470291337.ch37

[4] Morgensen M, Skaarup S: Solid State Ion Vol.86–88:(1996), p.1151

[5] C.S. Montross, H. Yokokawa, M. Dokiya: Thermal stresses in planar solid oxide fuel cells due to thermal expansion differences, British Ceramic Transactions Vol.101 (3) (2002), p.85–93.

DOI: 10.1179/096797802225003956

[6] M. Mori, T. Yamamoto, H. Itoh, H. Inaba, H. Tagawa: Thermal expansion of nickel zirconia anodes in solid oxide fuel cells during fabrication and operation, Journal of Eletrochemical Society Vol. 145 (4) (1998), p.1374–1381.

DOI: 10.1149/1.1838468

[7] T. Klemenso, C.C. Appel, M. Mogensen: In situ observations of microstructural changes in SOFC anodes during redox cycling, Electrochemical and Solid State Letters Vol.9 (9) (2006), p.403–407.

DOI: 10.1149/1.2214303

[8] J. Malzbender, E. Wessel, R.W. Steinbrech: Reduction and re-oxidation of anodes for solid oxide fuel cells, Solid State Ionics Vol.176 (2005), p.2201–2203.

DOI: 10.1016/j.ssi.2005.06.014