Evaluation of Ba0.5Sr0.5Co0.8Fe0.2O3-δ as a potential cathode for an anode-supported proton-conducting solid-oxide fuel cell

Ye Lin, Ran Ran, Yao Zheng, Zongping Shao, Wanqin Jin, Nanping Xu, Jeongmin Ahn

Research output: Contribution to journalArticle

116 Scopus citations

Abstract

The potential application of Ba0.5Sr0.5Co0.8Fe0.2O3-δ (BSCF) as a cathode for a proton-conducting solid-oxide fuel cell based on BaCe0.9Y0.1O2.95 (BCY) electrolyte was investigated. Cation diffusion from BCY to BSCF with the formation of a perovskite-type Ba2+-enriched BSCF and a Ba2+-deficient BCY at a firing temperature as low as 900 °C was observed, the higher the firing temperature the larger deviation of the A to B ratio from unit for the perovskites. Symmetric cell tests demonstrated the impurity phases did not induce a significant change of the cathodic polarization resistance, however, the ohmic resistance of the cell increased obviously. Anode-supported cells with the electrolyte thickness of ∼50 μm were successfully fabricated via a dual-dry pressing process for the single-cell test. Under optimized conditions, a maximum peak power density of ∼550 and 100 mW cm-2 was achieved at 700 and 400 °C, respectively, for the cell with the BSCF cathode layer fired from 950 °C. At 500 °C, the ohmic resistance is still the main source of cell resistance. A further reduction in membrane thickness would envisage an increase in power density significantly.

Original languageEnglish (US)
Pages (from-to)15-22
Number of pages8
JournalJournal of Power Sources
Volume180
Issue number1
DOIs
StatePublished - May 15 2008

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Keywords

  • BaSrCoFeO
  • Cathode
  • Perovskite
  • Proton
  • Solid-oxide fuel cells

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering

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