Co-firing of anode-supported SOFCs with Thin La 0.9Sr 0.1Ga 0.8Mg 0.2O 3-δ electrolytes

Yuanbo Lin*, Scott A Barnett

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

79 Scopus citations

Abstract

Anode-supported solid oxide fuel cells (SOFCs) with thin La0.9 Sr0.1 Ga0.8 Mg0.2 O3-δ (LSGM) electrolytes and (Ce0.6 La0.4) O2-δ (LDC) barrier layers were studied. The cells were fabricated by first colloidally depositing an LDC/LSGM/LDC tri-layer on a NiO-LDC anode support and co-firing. Cathodes consisting of LSCF-LSGM (LSCF= La0.6 Sr0.4 Fe0.8 Co0.2 O3-δ) were then deposited and fired. Cell tests in air and humidified hydrogen showed maximum power densities of 0.91 W cm2 at 700°C and 0.60 W cm2 at 650°C. The relatively good performance indicated that the LDC layers were effective in minimizing interdiffusion and reaction. However, the open-circuit voltage of these cells was ∼0.1 V lower than the Nernst potential; observations of electrolyte microstructure and composition indicated that this was due to electronic conductivity in the LSGM layer, resulting from Ni impurities that entered during co-firing with the NiO-LDC anode. While the LDC layers were necessary, impedance measurements indicated that they substantially increased the cell ohmic resistance.

Original languageEnglish (US)
JournalElectrochemical and Solid-State Letters
Volume9
Issue number6
DOIs
StatePublished - Jun 1 2006

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Materials Science(all)
  • Physical and Theoretical Chemistry
  • Electrochemistry
  • Electrical and Electronic Engineering

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