Mechanism for Major Improvement in SOFC Electrolyte Conductivity When Using Lithium Compounds as Anode

Yang He, Gang Chen*, Xuebai Zhang, Linlin Zhang, Di Yang, Muhammad Imran Asghar, Shujiang Geng, Peter D. Lund

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

1 Citation (Scopus)
35 Downloads (Pure)

Abstract

Recent studies indicate that the electrolyte ionic conductivity in an SOFC can be considerably increased by using lithium compounds as the electrode. We found that the ionic conductivity of Gd0.1Ce0.9O1.95 electrolyte in the Ni0.8Co0.15Al0.05LiO2 anode cell was 10.1 mS/cm only at 550 °C without H2, but it increased to 44.6 mS/cm after feeding H2 to the anode. It was found that LiOH/Li2CO3 moved into the GDC electrolyte from the NCAL anode and formed a three-phase composite electrolyte. A space charge region with a high oxygen vacancy concentration is formed around the interface of LiOH/Li2CO3 and GDC, which increases the ionic conductivity.

Original languageEnglish
Pages (from-to)4134-4138
Number of pages5
JournalACS Applied Energy Materials
Volume3
Issue number5
DOIs
Publication statusPublished - 26 May 2020
MoE publication typeA1 Journal article-refereed

Keywords

  • anode
  • ionic conductivity
  • LiCO
  • LiOH
  • NiCoAlLiO
  • solid oxide fuel cell
  • space charge

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