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2174 |
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Preparation of Sm0.5Sr0.5CoO3 of fine structure by solution precursor plasma spraying for SOFC cathode |
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Chang-Jiu Li / Xi'an Jiaotong University, P.R. China Xiao-Ming Wang / School of Materials Science and Engineering, Xi'an Jiaotong University, P.R.China Li-Hui Tian/ School of Materials Science and Engineering, Xi'an Jiaotong University, P.R.China Bo Song/ School of Materials Science and Engineering, Xi'an Jiaotong University, P.R.China Guan-Jun Yang/ School of Materials Science and Engineering, Xi'an Jiaotong University, P.R.China |
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Strontium-doped samarium cobaltite (Sm0.5Sr0.5CoO3, SSC) is a promising candidate for cathode materials in intermediate temperature solid oxide fuel cells (IT-SOFCs) owing to its mixed-conducting characteristics and relatively high ionic conductivity. In this paper, solution precursor plasma spraying (SPPS) was employed to prepare porous SSC cathode for SOFC. The metal nitrates of Sm(NO3)3?6H2O, Co(NO3)3?6H2O and Sr(NO3)2 were dissolved in the distilled water to form an aqueous solution which were employed as the starting precursors. YSZ plate was employed as the substrate for deposition of SSC. The SSC was deposited on YSZ substrate preheated to 400oC. The influence of spray distance and post-spray annealing treatment on the surface morphology and microstructure of SSC layer were examined by SEM. The phase structure was characterized by X-ray diffraction (XRD). The results showed that the as-sprayed SSC deposits are present in the form of agglomerated solid particles with substantial submicrometer pores. Annealing at 900oC for 2 hours in air results in coherent porous deposits of the partially crystallized perovskite phase. The fraction of porous deposits decreased with the increase of spray distance. |