Microstructure refinement of pulsed laser deposited La0.6Sr 0.4CoO3-δ thin-film cathodes for solid oxide fuel cell

Jaeyeon Hwang, Heon Lee, Kyung Joong Yoon, Hae Weon Lee, Jong Ho Lee, Hue Sup Song, Ji Won Son

Research output: Contribution to journalArticlepeer-review

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.

Original languageEnglish
Pages (from-to)1347-1349
Number of pages3
JournalMetals and Materials International
Volume19
Issue number6
DOIs
Publication statusPublished - 2013 Nov

Keywords

  • cathode
  • pulsed laser deposition
  • solid oxide fuel cell
  • surface modification

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry

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