Preparation of Nanocomposite GDC/LSCF Cathode Material for IT-SOFC by Induction Plasma Spraying
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an Shen, Veronica Alexandra B. Almeida, and Franc¸ois Gitzhofer (Submitted May 1, 2010; in revised form October 10, 2010) Homogeneous mixtures of Ce0.8Gd0.2O1.9 (GDC) and La0.6Sr0.4Co0.2Fe0.8O3 (LSCF) nanopowders were successfully synthesized using induction plasma by axial injection of a solution. The resulting nanocomposite powders consisted of two kinds of nanopowders with different mass ratio of GDC/LSCF, such as 3/7 and 6/4. The morphological features, crystallinity, and the phases of the synthesized powders were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), local energy-dispersive x-ray spectroscopy (EDS) analysis, and x-ray diffraction (XRD). The nanopowders are almost globular in shape with a diameter smaller than 100 nm and their BET specific areas are around 20 m2 g21. The GDC and LSCF phases are well distributed in the nanopowders. In addition, suspensions, made with the as-synthesized composite nanopowders and ethanol, were used to deposit cathode coatings using suspension plasma spray (SPS). Micro-nanostructures of the coatings are discussed. The coatings are homogeneous and porous (51% porosity) with cauliflower structures.
Keywords
gadolinium doped ceria (GDC), induction plasma, intermediate temperature solid oxide fuel cell (IT-SOFC), lanthanum strontium cobalt iron oxide (LSCF), nanocomposite powder, solution plasma spray (SolPS), suspension plasma spray (SPS)
1. Introduction On the path to commercialize reliable solid oxide fuel cells (SOFCs), the intermediate temperature solid oxide fuel cells (IT-SOFCs) are getting increased attention. When the operating temperature gets lower, the cell lifetime can be prolonged because of the potentially improved long-term stability of the material. Besides, the system costs can be reduced using lower-cost materials. However, when the operating temperature is decreased, the interfacial polarization resistance of the cathode This article is an invited paper selected from presentations at the 2010 International Thermal Spray Conference and has been expanded from the original presentation. It is simultaneously published in Thermal Spray: Global Solutions for Future Applications, Proceedings of the 2010 International Thermal Spray Conference, Singapore, May 3-5, 2010, Basil R. Marple, Arvind Agarwal, Margaret M. Hyland, Yuk-Chiu Lau, Chang-Jiu Li, Rogerio S. Lima, and Ghislain Montavon, Ed., ASM International, Materials Park, OH, 2011. Yan Shen, Veronica Alexandra B. Almeida, and Franc¸ois Gitzhofer, Chemical and Biotechnical Engineering Department, Energy, Plasma and Electrochemistry Research Centre (CREPE), Universite´ de Sherbrooke, Sherbrooke, QC J1K 2R1, Canada. Contact e-mails: [email protected] and Yan. [email protected].
Journal of Thermal Spray Technology
dramatically increases leading to a high cell voltage loss, which can be as high as 65% of the total voltage loss in the IT-SOFCs (Ref 1). To overcome this problem, the polarization resistance must be lowered at intermediate temperature.
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