Evaluation of Laves-phase forming Fe-Cr alloy for SOFC interconnects in reducing atmosphere

Teruhisa Horita; Haruo Kishimoto; Katsuhiko Yamaji; Yueping Xiong; Natsuko Sakai; Manuel E. Brito; Harumi Yokokawa

doi:10.1016/j.jpowsour.2007.10.041

Evaluation of Laves-phase forming Fe-Cr alloy for SOFC interconnects in reducing atmosphere

Teruhisa Horita^*
, Haruo Kishimoto
, Katsuhiko Yamaji
, Yueping Xiong
, Natsuko Sakai
, Manuel E. Brito
, Harumi Yokokawa

^*Corresponding author for this work

National Institute of Advanced Industrial Science and Technology

Research output: Contribution to journal › Article › peer-review

76 Scopus citations

Abstract

A Laves-phase forming Fe-Cr alloy was evaluated as interconnects for solid oxide fuel cells (SOFCs) in reducing atmosphere (in H₂-H₂O). The oxide scale growth was compared between Laves-phase forming alloy and typical stainless steel (SUS430). The oxide scale growth rates were decreased in the Laves-phase forming alloy, and the area-specific resistance (ASR) of oxidized Laves-phase forming alloy showed the lower values than that of SUS430. The temperature dependence of 1/ASR for the oxidized alloy was different between Laves-phase forming alloy and SUS430. The oxygen diffusivity in the oxide scale was also evaluated by the stable isotope oxygen (¹⁸O₂) diffusion in the scale. The chemical diffusion coefficients of isotope oxygen in the oxide scale showed the smaller value for the Laves-phase forming alloy (D = 7.0 × 10^-13 cm² s^-1) than that for SUS430 (D = 4.6 × 10^-12 cm² s^-1) at 1073 K. A relatively high diffusivity of oxygen was estimated in the Mn-Cr spinel oxide on the top surface of oxide scales. Inward diffusion of oxygen and outward diffusion of cation in the oxide scale were discussed to consider the oxide scale growth mechanism.

Original language	English
Pages (from-to)	54-61
Number of pages	8
Journal	Journal of Power Sources
Volume	176
Issue number	1
DOIs	https://doi.org/10.1016/j.jpowsour.2007.10.041
State	Published - 21 Jan 2008
Externally published	Yes

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SDG 7 Affordable and Clean Energy

Keywords

Fe-Cr alloy
Grain boundary
Interconnect
Oxide scale
Solid oxide fuel cells (SOFCs)

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10.1016/j.jpowsour.2007.10.041

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title = "Evaluation of Laves-phase forming Fe-Cr alloy for SOFC interconnects in reducing atmosphere",

abstract = "A Laves-phase forming Fe-Cr alloy was evaluated as interconnects for solid oxide fuel cells (SOFCs) in reducing atmosphere (in H2-H2O). The oxide scale growth was compared between Laves-phase forming alloy and typical stainless steel (SUS430). The oxide scale growth rates were decreased in the Laves-phase forming alloy, and the area-specific resistance (ASR) of oxidized Laves-phase forming alloy showed the lower values than that of SUS430. The temperature dependence of 1/ASR for the oxidized alloy was different between Laves-phase forming alloy and SUS430. The oxygen diffusivity in the oxide scale was also evaluated by the stable isotope oxygen (18O2) diffusion in the scale. The chemical diffusion coefficients of isotope oxygen in the oxide scale showed the smaller value for the Laves-phase forming alloy (D = 7.0 × 10-13 cm2 s-1) than that for SUS430 (D = 4.6 × 10-12 cm2 s-1) at 1073 K. A relatively high diffusivity of oxygen was estimated in the Mn-Cr spinel oxide on the top surface of oxide scales. Inward diffusion of oxygen and outward diffusion of cation in the oxide scale were discussed to consider the oxide scale growth mechanism.",

keywords = "Fe-Cr alloy, Grain boundary, Interconnect, Oxide scale, Solid oxide fuel cells (SOFCs)",

author = "Teruhisa Horita and Haruo Kishimoto and Katsuhiko Yamaji and Yueping Xiong and Natsuko Sakai and Brito, \{Manuel E.\} and Harumi Yokokawa",

year = "2008",

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T1 - Evaluation of Laves-phase forming Fe-Cr alloy for SOFC interconnects in reducing atmosphere

AU - Horita, Teruhisa

AU - Kishimoto, Haruo

AU - Yamaji, Katsuhiko

AU - Xiong, Yueping

AU - Sakai, Natsuko

AU - Brito, Manuel E.

AU - Yokokawa, Harumi

PY - 2008/1/21

Y1 - 2008/1/21

N2 - A Laves-phase forming Fe-Cr alloy was evaluated as interconnects for solid oxide fuel cells (SOFCs) in reducing atmosphere (in H2-H2O). The oxide scale growth was compared between Laves-phase forming alloy and typical stainless steel (SUS430). The oxide scale growth rates were decreased in the Laves-phase forming alloy, and the area-specific resistance (ASR) of oxidized Laves-phase forming alloy showed the lower values than that of SUS430. The temperature dependence of 1/ASR for the oxidized alloy was different between Laves-phase forming alloy and SUS430. The oxygen diffusivity in the oxide scale was also evaluated by the stable isotope oxygen (18O2) diffusion in the scale. The chemical diffusion coefficients of isotope oxygen in the oxide scale showed the smaller value for the Laves-phase forming alloy (D = 7.0 × 10-13 cm2 s-1) than that for SUS430 (D = 4.6 × 10-12 cm2 s-1) at 1073 K. A relatively high diffusivity of oxygen was estimated in the Mn-Cr spinel oxide on the top surface of oxide scales. Inward diffusion of oxygen and outward diffusion of cation in the oxide scale were discussed to consider the oxide scale growth mechanism.

AB - A Laves-phase forming Fe-Cr alloy was evaluated as interconnects for solid oxide fuel cells (SOFCs) in reducing atmosphere (in H2-H2O). The oxide scale growth was compared between Laves-phase forming alloy and typical stainless steel (SUS430). The oxide scale growth rates were decreased in the Laves-phase forming alloy, and the area-specific resistance (ASR) of oxidized Laves-phase forming alloy showed the lower values than that of SUS430. The temperature dependence of 1/ASR for the oxidized alloy was different between Laves-phase forming alloy and SUS430. The oxygen diffusivity in the oxide scale was also evaluated by the stable isotope oxygen (18O2) diffusion in the scale. The chemical diffusion coefficients of isotope oxygen in the oxide scale showed the smaller value for the Laves-phase forming alloy (D = 7.0 × 10-13 cm2 s-1) than that for SUS430 (D = 4.6 × 10-12 cm2 s-1) at 1073 K. A relatively high diffusivity of oxygen was estimated in the Mn-Cr spinel oxide on the top surface of oxide scales. Inward diffusion of oxygen and outward diffusion of cation in the oxide scale were discussed to consider the oxide scale growth mechanism.

KW - Fe-Cr alloy

KW - Grain boundary

KW - Interconnect

KW - Oxide scale

KW - Solid oxide fuel cells (SOFCs)

UR - https://www.scopus.com/pages/publications/37349011220

U2 - 10.1016/j.jpowsour.2007.10.041

DO - 10.1016/j.jpowsour.2007.10.041

M3 - 文章

AN - SCOPUS:37349011220

SN - 0378-7753

VL - 176

SP - 54

EP - 61

JO - Journal of Power Sources

JF - Journal of Power Sources

IS - 1

ER -

Evaluation of Laves-phase forming Fe-Cr alloy for SOFC interconnects in reducing atmosphere

Abstract

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Keywords

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