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Microstructure refinement of pulsed laser deposited La0.6Sr0.4CoO3−δ thin-film cathodes for solid oxide fuel cell

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Abstract

In this study, the microstructural modification of pulsed laser deposited La0.6Sr0.4CoO3−δ (LSC64) thin-film cathodes for solid oxide fuel cells (SOFCs) to improve the lateral conduction and to reduce the surface composition degradation is investigated. A high-temperature deposited 100 nm-thick denser LSC64 layer is added over 2.4 μm-thick porous cathode to cover and bridge the cathode domains. According to the cell performance analyses using current-voltage-power measurements, the performance of the cell modified with an additional denser layer is increased compared with the cell without the denser layer in all operating temperature range. The degree of improvement of peak power density is bigger than 10% at 650–550 °C and is about 6% at 500 °C. This performance enhancement can be attributed to the electrochemical property improvement, especially oxygen surface exchange property, rather than to the conduction improvement, based on the electrochemical impedance analysis. Improved crystallinity and composition integrity of the denser LSC64 layer is considered to enhance the surface exchange property of the cathode.

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Authors and Affiliations

  1. High-Temp. Energy Materials Research Center, Korea Institute of Science and Technology, Seoul, 136-791, Korea

    Jaeyeon Hwang, Kyung Joong Yoon, Hae-Weon Lee, Jong-Ho Lee & Ji-Won Son

  2. Department of Materials Science and Engineering, Korea University, Seoul, 136-713, Korea

    Jaeyeon Hwang & Heon Lee

  3. Kongju National University Division of Advanced Materials Engineering, Kongju, 331-717, Korea

    Hue-Sup Song

Authors
  1. Jaeyeon Hwang
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  2. Heon Lee
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  3. Kyung Joong Yoon
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  4. Hae-Weon Lee
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  5. Jong-Ho Lee
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  6. Hue-Sup Song
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  7. Ji-Won Son
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Correspondence to Ji-Won Son.

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Hwang, J., Lee, H., Yoon, K.J. et al. Microstructure refinement of pulsed laser deposited La0.6Sr0.4CoO3−δ thin-film cathodes for solid oxide fuel cell. Met. Mater. Int. 19, 1347–1349 (2013). https://doi.org/10.1007/s12540-013-0638-9

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  • DOI: https://doi.org/10.1007/s12540-013-0638-9

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