Improved electrochemical oxidation kinetics of La0.5Ba0.5FeO3-δ anode for solid oxide fuel cells with fluorine doping

Nianjun Hou, Juanjuan Gan, Qisheng Yan, Yicheng Zhao*, Yongdan Li

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

28 Citations (Scopus)
3 Downloads (Pure)

Abstract

Sluggish anode kinetics and serious carbon deposition are two major obstacles to developing hydrocarbon fueled solid oxide fuel cells. A highly active and stable perovskite La0.5Ba0.5FeO3-δ anode material is studied in this work. The oxygen surface exchange and charge transfer steps are the rate-determining steps of the anode process, and the former is accelerated with fluorine doping on the anion sites due to the lowering of metal-oxygen bond energy. The oxygen surface exchange coefficients of La0.5Ba0.5FeO3-δ and La0.5Ba0.5FeO2.9-δF0.1 at 850 °C are 1.4 × 10−4 and 2.8 × 10−4 cm s−1, respectively. A single cell supported by a 300 μm-thick La0.8Sr0.2Ga0.8Mg0.2O3-δ electrolyte layer with La0.5Ba0.5FeO3-δ anode shows maximum power densities of 1446 and 691 mW cm−2 at 850 °C with wet hydrogen and methane fuels, respectively, which increase to 1860 and 809 mW cm−2 respectively when La0.5Ba0.5FeO2.9-δF0.1 is used as the anode. The cell exhibits a short-term durability of 40 h using wet methane as fuel without carbon deposition on the anode.

Original languageEnglish
Article number230932
JournalJournal of Power Sources
Volume521
Early online date21 Dec 2021
DOIs
Publication statusPublished - 15 Feb 2022
MoE publication typeA1 Journal article-refereed

Keywords

  • Anion doping
  • Anode
  • Hydrocarbon fuel
  • Lanthanum ferrite
  • Solid oxide fuel cell

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