Reoxidation behavior of Ni-Fe bimetallic anode substrate in solid oxide fuel cells using a thin LaGaO3 based film electrolyte

Young Wan Ju, Shintaro Ida, Toru Inagaki, Tatsumi Ishihara

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

The reoxidation behavior of a Ni-Fe metal anode supported cell using a thin LaGaO3 electrolyte film was investigated as a function of the reoxidation temperature. After oxidation and reduction treatments for 2 h, the voltage did not return to the initial voltage at higher temperatures (773-973 K); however, after reoxidation at 673 K, the cell exhibited almost the same OCV as the as-prepared cell. During reoxidation with air at the higher temperatures, the Ni-Fe metal substrate exhibited two different expansion behaviors by the different oxidation rates of Ni and Fe. On the other hand, the volumetric change of the oxidized substrate at 673 K was negligible. SEM-EDX results exhibited the reoxidation of Ni-Fe occurred only at the bottom part of the substrate and at the interface between the electrolyte and the substrate. In spite of temperatures as low as 673 K, the cell generated a power of 160 mW cm -2, which hardly decreased after the redox cycle. The increasing anodic internal resistance accompanied with unreduced Fe.

Original languageEnglish
Pages (from-to)6062-6069
Number of pages8
JournalJournal of Power Sources
Volume196
Issue number15
DOIs
Publication statusPublished - Aug 1 2011

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solid oxide fuel cells
Solid oxide fuel cells (SOFC)
Electrolytes
Anodes
anodes
electrolytes
Substrates
Metals
cells
cell anodes
Oxidation
Temperature
oxidation
Electric potential
electric potential
metals
Energy dispersive spectroscopy
Scanning electron microscopy
cycles
scanning electron microscopy

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

Reoxidation behavior of Ni-Fe bimetallic anode substrate in solid oxide fuel cells using a thin LaGaO3 based film electrolyte. / Ju, Young Wan; Ida, Shintaro; Inagaki, Toru; Ishihara, Tatsumi.

In: Journal of Power Sources, Vol. 196, No. 15, 01.08.2011, p. 6062-6069.

Research output: Contribution to journalArticle

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abstract = "The reoxidation behavior of a Ni-Fe metal anode supported cell using a thin LaGaO3 electrolyte film was investigated as a function of the reoxidation temperature. After oxidation and reduction treatments for 2 h, the voltage did not return to the initial voltage at higher temperatures (773-973 K); however, after reoxidation at 673 K, the cell exhibited almost the same OCV as the as-prepared cell. During reoxidation with air at the higher temperatures, the Ni-Fe metal substrate exhibited two different expansion behaviors by the different oxidation rates of Ni and Fe. On the other hand, the volumetric change of the oxidized substrate at 673 K was negligible. SEM-EDX results exhibited the reoxidation of Ni-Fe occurred only at the bottom part of the substrate and at the interface between the electrolyte and the substrate. In spite of temperatures as low as 673 K, the cell generated a power of 160 mW cm -2, which hardly decreased after the redox cycle. The increasing anodic internal resistance accompanied with unreduced Fe.",
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AB - The reoxidation behavior of a Ni-Fe metal anode supported cell using a thin LaGaO3 electrolyte film was investigated as a function of the reoxidation temperature. After oxidation and reduction treatments for 2 h, the voltage did not return to the initial voltage at higher temperatures (773-973 K); however, after reoxidation at 673 K, the cell exhibited almost the same OCV as the as-prepared cell. During reoxidation with air at the higher temperatures, the Ni-Fe metal substrate exhibited two different expansion behaviors by the different oxidation rates of Ni and Fe. On the other hand, the volumetric change of the oxidized substrate at 673 K was negligible. SEM-EDX results exhibited the reoxidation of Ni-Fe occurred only at the bottom part of the substrate and at the interface between the electrolyte and the substrate. In spite of temperatures as low as 673 K, the cell generated a power of 160 mW cm -2, which hardly decreased after the redox cycle. The increasing anodic internal resistance accompanied with unreduced Fe.

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