Diffusion of oxygen in the scales of Fe-Cr alloy interconnects and oxide coating layer for solid oxide fuel cells

Teruhisa Horita; Haruo Kishimoto; Katsuhiko Yamaji; Yueping Xiong; Manuel E. Brito; Harumi Yokokawa; Yoshitaka Baba; Kei Ogasawara; Harukuni Kameda; Yoshio Matsuzaki; Satoshi Yamashita; Nobutaka Yasuda; Toshihiro Uehara

doi:10.1016/j.ssi.2008.07.024

Diffusion of oxygen in the scales of Fe-Cr alloy interconnects and oxide coating layer for solid oxide fuel cells

Teruhisa Horita, Haruo Kishimoto, Katsuhiko Yamaji, Yueping Xiong, Manuel E. Brito, Harumi Yokokawa, Yoshitaka Baba, Kei Ogasawara, Harukuni Kameda, Yoshio Matsuzaki, Satoshi Yamashita, Nobutaka Yasuda, Toshihiro Uehara

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36 Citations (Scopus)

Abstract

Oxygen diffusivity was examined in the oxide scales formed on Fe-Cr alloy surface and Mn-Co spinel coating layer. The stable isotope oxygen (¹⁸O₂) was adopted to visualize the diffusion profiles of oxygen in the oxide scales and coating layer. A relatively fast diffusivity of ¹⁸O was observed (diffusion coefficients were 10^{- 12} cm² s^{- 1} orders of magnitude at 1073 K) in the oxide scale. MnCo₂O₄ spinel coating was examined on the Fe-Cr alloy surface to clarify the ¹⁸O diffusion in the coating oxide layer. Two drops of ¹⁸O diffusion profiles were observed in the MnCo₂O₄ spinel coating layer; first one was at surface region and second was MnCo₂O₄ spinel coating/alloy interface. Relatively fast ¹⁸O diffusion coefficients were observed on the Mn-Co spinel surface (the diffusivities of ¹⁸O were 10^{- 13}-10^{- 12} cm² s^{- 1} at 1073 K). A significant fast diffusivity of ¹⁸O was observed in the middle of the MnCo₂O₄ spinel coating. The second drop of ¹⁸O concentration can be related to the existence of Cr around the MnCo₂O₄ spinel coating/alloy interfaces. The growth rate of oxide scale was controlled by the existence of Cr around the oxide scale/alloy or oxide coating/alloy interfaces.

Original language	English
Pages (from-to)	2216-2221
Number of pages	6
Journal	Solid State Ionics
Volume	179
Issue number	38
DOIs	https://doi.org/10.1016/j.ssi.2008.07.024
Publication status	Published - Nov 30 2008
Externally published	Yes

All Science Journal Classification (ASJC) codes

Chemistry(all)
Materials Science(all)
Condensed Matter Physics

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10.1016/j.ssi.2008.07.024

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Horita, T., Kishimoto, H., Yamaji, K., Xiong, Y., Brito, M. E., Yokokawa, H., Baba, Y., Ogasawara, K., Kameda, H., Matsuzaki, Y., Yamashita, S., Yasuda, N., & Uehara, T. (2008). Diffusion of oxygen in the scales of Fe-Cr alloy interconnects and oxide coating layer for solid oxide fuel cells. Solid State Ionics, 179(38), 2216-2221. https://doi.org/10.1016/j.ssi.2008.07.024

Horita, T, Kishimoto, H, Yamaji, K, Xiong, Y, Brito, ME, Yokokawa, H, Baba, Y, Ogasawara, K, Kameda, H, Matsuzaki, Y, Yamashita, S, Yasuda, N & Uehara, T 2008, 'Diffusion of oxygen in the scales of Fe-Cr alloy interconnects and oxide coating layer for solid oxide fuel cells', Solid State Ionics, vol. 179, no. 38, pp. 2216-2221. https://doi.org/10.1016/j.ssi.2008.07.024

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title = "Diffusion of oxygen in the scales of Fe-Cr alloy interconnects and oxide coating layer for solid oxide fuel cells",

abstract = "Oxygen diffusivity was examined in the oxide scales formed on Fe-Cr alloy surface and Mn-Co spinel coating layer. The stable isotope oxygen (18O2) was adopted to visualize the diffusion profiles of oxygen in the oxide scales and coating layer. A relatively fast diffusivity of 18O was observed (diffusion coefficients were 10- 12 cm2 s- 1 orders of magnitude at 1073 K) in the oxide scale. MnCo2O4 spinel coating was examined on the Fe-Cr alloy surface to clarify the 18O diffusion in the coating oxide layer. Two drops of 18O diffusion profiles were observed in the MnCo2O4 spinel coating layer; first one was at surface region and second was MnCo2O4 spinel coating/alloy interface. Relatively fast 18O diffusion coefficients were observed on the Mn-Co spinel surface (the diffusivities of 18O were 10- 13-10- 12 cm2 s- 1 at 1073 K). A significant fast diffusivity of 18O was observed in the middle of the MnCo2O4 spinel coating. The second drop of 18O concentration can be related to the existence of Cr around the MnCo2O4 spinel coating/alloy interfaces. The growth rate of oxide scale was controlled by the existence of Cr around the oxide scale/alloy or oxide coating/alloy interfaces.",

author = "Teruhisa Horita and Haruo Kishimoto and Katsuhiko Yamaji and Yueping Xiong and Brito, {Manuel E.} and Harumi Yokokawa and Yoshitaka Baba and Kei Ogasawara and Harukuni Kameda and Yoshio Matsuzaki and Satoshi Yamashita and Nobutaka Yasuda and Toshihiro Uehara",

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T1 - Diffusion of oxygen in the scales of Fe-Cr alloy interconnects and oxide coating layer for solid oxide fuel cells

AU - Horita, Teruhisa

AU - Kishimoto, Haruo

AU - Yamaji, Katsuhiko

AU - Xiong, Yueping

AU - Brito, Manuel E.

AU - Yokokawa, Harumi

AU - Baba, Yoshitaka

AU - Ogasawara, Kei

AU - Kameda, Harukuni

AU - Matsuzaki, Yoshio

AU - Yamashita, Satoshi

AU - Yasuda, Nobutaka

AU - Uehara, Toshihiro

PY - 2008/11/30

Y1 - 2008/11/30

N2 - Oxygen diffusivity was examined in the oxide scales formed on Fe-Cr alloy surface and Mn-Co spinel coating layer. The stable isotope oxygen (18O2) was adopted to visualize the diffusion profiles of oxygen in the oxide scales and coating layer. A relatively fast diffusivity of 18O was observed (diffusion coefficients were 10- 12 cm2 s- 1 orders of magnitude at 1073 K) in the oxide scale. MnCo2O4 spinel coating was examined on the Fe-Cr alloy surface to clarify the 18O diffusion in the coating oxide layer. Two drops of 18O diffusion profiles were observed in the MnCo2O4 spinel coating layer; first one was at surface region and second was MnCo2O4 spinel coating/alloy interface. Relatively fast 18O diffusion coefficients were observed on the Mn-Co spinel surface (the diffusivities of 18O were 10- 13-10- 12 cm2 s- 1 at 1073 K). A significant fast diffusivity of 18O was observed in the middle of the MnCo2O4 spinel coating. The second drop of 18O concentration can be related to the existence of Cr around the MnCo2O4 spinel coating/alloy interfaces. The growth rate of oxide scale was controlled by the existence of Cr around the oxide scale/alloy or oxide coating/alloy interfaces.

AB - Oxygen diffusivity was examined in the oxide scales formed on Fe-Cr alloy surface and Mn-Co spinel coating layer. The stable isotope oxygen (18O2) was adopted to visualize the diffusion profiles of oxygen in the oxide scales and coating layer. A relatively fast diffusivity of 18O was observed (diffusion coefficients were 10- 12 cm2 s- 1 orders of magnitude at 1073 K) in the oxide scale. MnCo2O4 spinel coating was examined on the Fe-Cr alloy surface to clarify the 18O diffusion in the coating oxide layer. Two drops of 18O diffusion profiles were observed in the MnCo2O4 spinel coating layer; first one was at surface region and second was MnCo2O4 spinel coating/alloy interface. Relatively fast 18O diffusion coefficients were observed on the Mn-Co spinel surface (the diffusivities of 18O were 10- 13-10- 12 cm2 s- 1 at 1073 K). A significant fast diffusivity of 18O was observed in the middle of the MnCo2O4 spinel coating. The second drop of 18O concentration can be related to the existence of Cr around the MnCo2O4 spinel coating/alloy interfaces. The growth rate of oxide scale was controlled by the existence of Cr around the oxide scale/alloy or oxide coating/alloy interfaces.

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Diffusion of oxygen in the scales of Fe-Cr alloy interconnects and oxide coating layer for solid oxide fuel cells

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