Influence of Partial Substitution of Ba2+ for Sm3+ on the Structure and Electrochemical Properties of Sm 0.5-xBaxSr0.5Co0.8Fe 0.2O3-δPerovskite

Yan Hua Wang; Xi Wen Song; Fen Zhou; Jian Quan Gao; Sheng Li An

doi:10.4028/www.scientific.net/AMR.239-242.552

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 239-242Influence of Partial Substitution of Ba2+ for Sm3+...

Influence of Partial Substitution of Ba²⁺ for Sm³⁺ on the Structure and Electrochemical Properties of Sm_0.5-xBa_xSr_0.5Co_0.8Fe_0.2O_3-δPerovskite

Abstract:

Sm_0.5-xBa_xSr_0.5Co_0.8Fe_0.2O_3-δ powders were synthesized by a sol-gel method. The crystal structure and thermal expansion coefficient of Sm_0.5-xBa_xSr_0.5Co_0.8Fe_0.2O_3-δ(SBSCF, x=0.00, 0.05, 0.10) were investigated. All samples were the perovskite structure with an orthorhombic symmetry and exhibited a similar thermal expansion behavior. The electrochemical properties of SBSCF-SDC composite cathodes were studied using A.C. impedance method. The substitution of Ba²⁺ for Sm³⁺ had a significant effect on the area specific resistance of the composite cathodes. The area specific resistance (ASR) decreased with the increase of Ba²⁺ substitution. This result suggested that the electrochemical performance of Sm_0.5Sr_0.5Co_0.8Fe_0.2O_3-δ based cathode improved as Sm³⁺ is partially substituted by Ba²⁺.

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Advanced Materials Research (Volumes 239-242)

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552-557

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.239-242.552

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Online since:

May 2011

Authors:

Yan Hua Wang, Xi Wen Song, Fen Zhou, Jian Quan Gao, Sheng Li An

Keywords:

Area Specific Resistance, Composite Cathode, Solid Oxide Fuel Cell (SOFC), Thermal Expansion Behavior

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