IT-SOFC 공기극 적용을 위한 비화학양론 조성의 Sm1-Ba0.5Sr0.5Co2O5+d Layered Perovskite 산화물 합성 및 전기화학 특성
Phase Synthesis and Electrochemical Characteristics of Non-stoichiometric Sm1-xBa0.5Sr0.5Co2O5+d Layered Perovskites for IT-SOFC Cathodes
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In this study, non-stoichiometric compositions of Sm1-xBa0.5Sr0.5Co2O5+d (x=0~0.25) oxide systems were synthesized as the cathode materials in an Intermediate Temperature-Operating Solid Oxide Fuel Cell (IT-SOFC) by partially removing Sm from SmBa0.5Sr0.5Co2O5+d (SBSCO). The resulting cathode showed superior oxide ionic diffusivity, excellent oxygen surface exchange coefficients, high oxygen transport properties, and higher electrical conductivity. The composition ranges for the single phases of Sm1-xBa0.5Sr0.5Co2O5+d were in the ranges of x=0 to 0.10. At these non-stoichiometric compositions, Sm0.95Ba0.5Sr0.5Co2O5+d (SBSCO-0.95) showed the highest electrical conductivity of 380 and 310 S/cm at 600 and 700°C. The area specific resistances (ASRs) of the composite cathode of 50 wt % of SBSCO-0.95 and 50 wt % of CGO91 (SBSCO-0.95:CGO91) were 0.40, 0.19, 0.09 and 0.05Ωcm 2 at 650, 700, 750 and 800°C, respectively. The activation energy of SBSCO-0.95 : CGO91 was the lowest at 1.16eV.
Abstract
In this study, non-stoichiometric compositions of Sm1-xBa0.5Sr0.5Co2O5+d (x=0~0.25) oxide systems were synthesized as the cathode materials in an Intermediate Temperature-Operating Solid Oxide Fuel Cell (IT-SOFC) by partially removing Sm from SmBa0.5Sr0.5Co2O5+d (SBSCO). The resulting cathode showed superior oxide ionic diffusivity, excellent oxygen surface exchange coefficients, high oxygen transport properties, and higher electrical conductivity. The composition ranges for the single phases of Sm1-xBa0.5Sr0.5Co2O5+d were in the ranges of x=0 to 0.10. At these non-stoichiometric compositions, Sm0.95Ba0.5Sr0.5Co2O5+d (SBSCO-0.95) showed the highest electrical conductivity of 380 and 310 S/cm at 600 and 700°C. The area specific resistances (ASRs) of the composite cathode of 50 wt % of SBSCO-0.95 and 50 wt % of CGO91 (SBSCO-0.95:CGO91) were 0.40, 0.19, 0.09 and 0.05Ωcm 2 at 650, 700, 750 and 800°C, respectively. The activation energy of SBSCO-0.95 : CGO91 was the lowest at 1.16eV.
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