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Thermal, micro-structural, and electrical properties of a La1−x Sr x Mn0.85Fe0.05Co0.05Ni0.05O3+δ (x = 0–0.4 mole) cathode system

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Abstract

The oxygen stoichiometry, thermal expansion, morphology, and electrical conductivity of a co-doped perovskitetype cathode system, La1−x Sr x Mn0.85Fe0.05Co0.05Ni0.05O3+ä (x = 0–0.4 mole), are studied for intermediate-temperature solid oxide fuel cell applications. Sr2+-doping led to a decrease in the unit cell volume, oxygen stoichiometry, particle size, and activation energy, and an increase in the coefficient of thermal expansion and electrical conductivity. The sample with x = 0.3 mole exhibited four to five fold weight loss with respect to La0.75Sr0.25MnO3+δ at an intermediate temperature range and suggested the availability of a large number of oxygen vacancies due to a co-doping effect. This sample also showed sufficiently high electrical conductivity (∼76 S cm−1) at 650 °C, a low activation energy (∼0.15 eV), and a coefficient of thermal expansion (∼12.1 × 10−6 °C−1) comparable to those of the adjacent components and submicron sized particles. The experimental results are explained using defect models.

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Authors and Affiliations

  1. School of Materials Science and Engineering, Inha University, 253, Yonghyeon-dong, Nam-gu, Incheon, 402-751, Korea

    Ravindra Kumar Gupta, Eun Yi Kim & Chin Myung Whang

  2. Department of Chemistry, Inha University, Incheon, 402-751, Korea

    Yoo Hang Kim

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  1. Ravindra Kumar Gupta
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  2. Eun Yi Kim
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  3. Yoo Hang Kim
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  4. Chin Myung Whang
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Correspondence to Chin Myung Whang.

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Gupta, R.K., Kim, E.Y., Kim, Y.H. et al. Thermal, micro-structural, and electrical properties of a La1−x Sr x Mn0.85Fe0.05Co0.05Ni0.05O3+δ (x = 0–0.4 mole) cathode system. Met. Mater. Int. 15, 1055–1060 (2009). https://doi.org/10.1007/s12540-009-1055-y

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  • DOI: https://doi.org/10.1007/s12540-009-1055-y

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