The effects of minor elements in La0.6Sr0.4Co0.2Fe0.8O3-δ cathodes on oxygen reduction reaction

Junya Oishi, Junichiro Otomo, Yoshito Oshima, Michihisa Koyama

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

It is known that the minor elements affect the performance of solid oxide fuel cell (SOFC). In this study, we focus on the influence of minor elements on the SOFC cathode properties. The Ca, Ba, Al, and Si, which originate from raw materials and production processes for SOFC cathodes, are investigated as minor elements that may have effect on the properties of La0.6Sr0.4Co0.2Fe0.8O3-δ (LSCF) cathode. To examine the effects of minor elements on the cathode properties, Ca, Ba, Al, and Si with a controlled concentration are added to the LSCF reference sample. Conductivity relaxation measurements are conducted to determine the chemical diffusion coefficient (Dchem) and surface exchange coefficient (ktr), which governs the overpotential characteristics of the LSCF cathode. The results show that Al and Si have negative effects on both Dchem and ktr while Ca and Ba do not alter Dchem and show weakly positive effects on ktr. The effects of Ca and Ba for the cathode properties are discussed on the basis of XPS measurements.

Original languageEnglish
Pages (from-to)44-51
Number of pages8
JournalJournal of Power Sources
Volume277
DOIs
Publication statusPublished - Mar 1 2015

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Chemical elements
Cathodes
cathodes
Oxygen
oxygen
solid oxide fuel cells
Solid oxide fuel cells (SOFC)
cell cathodes
Raw materials
X ray photoelectron spectroscopy
diffusion coefficient
conductivity
coefficients

All Science Journal Classification (ASJC) codes

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

Cite this

The effects of minor elements in La0.6Sr0.4Co0.2Fe0.8O3-δ cathodes on oxygen reduction reaction. / Oishi, Junya; Otomo, Junichiro; Oshima, Yoshito; Koyama, Michihisa.

In: Journal of Power Sources, Vol. 277, 01.03.2015, p. 44-51.

Research output: Contribution to journalArticle

Oishi, Junya ; Otomo, Junichiro ; Oshima, Yoshito ; Koyama, Michihisa. / The effects of minor elements in La0.6Sr0.4Co0.2Fe0.8O3-δ cathodes on oxygen reduction reaction. In: Journal of Power Sources. 2015 ; Vol. 277. pp. 44-51.
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