Comparison of oxidation behavior and electrical properties of doped NiO- and Cr2O3-forming alloys for solid-oxide, fuel-cell metallic interconnects

M. P. Brady; B. A. Pint; Z. G. Lu; J. H. Zhu; C. E. Milliken; E. D. Kreidler; L. Miller; T. R. Armstrong; L. R. Walker

doi:10.1007/s11085-006-9018-x

Comparison of oxidation behavior and electrical properties of doped NiO- and Cr₂O₃-forming alloys for solid-oxide, fuel-cell metallic interconnects

M. P. Brady, B. A. Pint, Z. G. Lu, J. H. Zhu, C. E. Milliken, E. D. Kreidler, L. Miller, T. R. Armstrong, L. R. Walker

Materials Science and Technology Div

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

38 Scopus citations

Abstract

The goal of this paper was to determine if NiO-forming alloys are a viable alternative to Cr₂O₃-forming alloys for solid-oxide fuel-cell (SOFC) metallic interconnects. The oxide-scale growth kinetics and electrical properties of a series of Li- and Y₂O₃-alloyed, NiO-forming Ni-base alloys and La-, Mn-, and Ti-alloyed Fe-18Cr-9W and Fe-25Cr base ferritic Cr₂O₃-forming alloys were evaluated. The addition of Y₂O₃ and Li reduced the NiO scale growth rate and increased its electrical conductivity. The area-specific-resistance (ASR) values were comparable to those of the best (lowest ASR) ferritic alloys examined. Oxidation of the ferritic alloys at 800°C in air and air+10% H₂O (water vapor) indicated that Mn additions resulted in faster oxidation kinetics/thicker oxide scales, but also lower oxide scale ASRs. Relative in-cell performance in model SOFC stacks operated at 850°C indicated a 60-80% reduction in ASR by Ni+Y₂O₃, Ni+Y ₂O₃, Li, and Fe-25Cr+La,Mn,Ti interconnects over those made from a baseline, commercial Cr₂O₃-forming alloy. Collectively, these results indicate that NiO-forming alloys show potential for use as metallic interconnects.

Original language	English
Pages (from-to)	237-261
Number of pages	25
Journal	Oxidation of Metals
Volume	65
Issue number	3-4
DOIs	https://doi.org/10.1007/s11085-006-9018-x
State	Published - Apr 2006

Funding

The authors thank I. Kosacki, P. F. Tortorelli, and I. G. Wright for helpful comments on this manuscript. This work was funded by a DOE SBIR grant led by TMI, Inc. and by the Solid-State Energy Conversion Alliance (SECA) Core Technology Program of the Department of Energy\u2019s National Energy Technology Laboratory (NETL) under agreement # DE-FC26-04NT42223. J. H. Zhu was also supported by National Science Foundation under Grant No. DMR-0238113. Oak Ridge National Laboratory is managed by UT-Battelle, LLC for the US DOE under contract DE-AC05-00OR22725.

Keywords

CrO
Electrical properties
Metallic interconnect
NiO
Solid-oxide fuel cell

Access to Document

10.1007/s11085-006-9018-x

Cite this

@article{ac08a512f5d741c9acb7a5bee1e037f2,

title = "Comparison of oxidation behavior and electrical properties of doped NiO- and Cr2O3-forming alloys for solid-oxide, fuel-cell metallic interconnects",

abstract = "The goal of this paper was to determine if NiO-forming alloys are a viable alternative to Cr2O3-forming alloys for solid-oxide fuel-cell (SOFC) metallic interconnects. The oxide-scale growth kinetics and electrical properties of a series of Li- and Y2O3-alloyed, NiO-forming Ni-base alloys and La-, Mn-, and Ti-alloyed Fe-18Cr-9W and Fe-25Cr base ferritic Cr2O3-forming alloys were evaluated. The addition of Y2O3 and Li reduced the NiO scale growth rate and increased its electrical conductivity. The area-specific-resistance (ASR) values were comparable to those of the best (lowest ASR) ferritic alloys examined. Oxidation of the ferritic alloys at 800°C in air and air+10\% H2O (water vapor) indicated that Mn additions resulted in faster oxidation kinetics/thicker oxide scales, but also lower oxide scale ASRs. Relative in-cell performance in model SOFC stacks operated at 850°C indicated a 60-80\% reduction in ASR by Ni+Y2O3, Ni+Y 2O3, Li, and Fe-25Cr+La,Mn,Ti interconnects over those made from a baseline, commercial Cr2O3-forming alloy. Collectively, these results indicate that NiO-forming alloys show potential for use as metallic interconnects.",

keywords = "CrO, Electrical properties, Metallic interconnect, NiO, Solid-oxide fuel cell",

author = "Brady, \{M. P.\} and Pint, \{B. A.\} and Lu, \{Z. G.\} and Zhu, \{J. H.\} and Milliken, \{C. E.\} and Kreidler, \{E. D.\} and L. Miller and Armstrong, \{T. R.\} and Walker, \{L. R.\}",

year = "2006",

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doi = "10.1007/s11085-006-9018-x",

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T1 - Comparison of oxidation behavior and electrical properties of doped NiO- and Cr2O3-forming alloys for solid-oxide, fuel-cell metallic interconnects

AU - Brady, M. P.

AU - Pint, B. A.

AU - Lu, Z. G.

AU - Zhu, J. H.

AU - Milliken, C. E.

AU - Kreidler, E. D.

AU - Miller, L.

AU - Armstrong, T. R.

AU - Walker, L. R.

PY - 2006/4

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N2 - The goal of this paper was to determine if NiO-forming alloys are a viable alternative to Cr2O3-forming alloys for solid-oxide fuel-cell (SOFC) metallic interconnects. The oxide-scale growth kinetics and electrical properties of a series of Li- and Y2O3-alloyed, NiO-forming Ni-base alloys and La-, Mn-, and Ti-alloyed Fe-18Cr-9W and Fe-25Cr base ferritic Cr2O3-forming alloys were evaluated. The addition of Y2O3 and Li reduced the NiO scale growth rate and increased its electrical conductivity. The area-specific-resistance (ASR) values were comparable to those of the best (lowest ASR) ferritic alloys examined. Oxidation of the ferritic alloys at 800°C in air and air+10% H2O (water vapor) indicated that Mn additions resulted in faster oxidation kinetics/thicker oxide scales, but also lower oxide scale ASRs. Relative in-cell performance in model SOFC stacks operated at 850°C indicated a 60-80% reduction in ASR by Ni+Y2O3, Ni+Y 2O3, Li, and Fe-25Cr+La,Mn,Ti interconnects over those made from a baseline, commercial Cr2O3-forming alloy. Collectively, these results indicate that NiO-forming alloys show potential for use as metallic interconnects.

AB - The goal of this paper was to determine if NiO-forming alloys are a viable alternative to Cr2O3-forming alloys for solid-oxide fuel-cell (SOFC) metallic interconnects. The oxide-scale growth kinetics and electrical properties of a series of Li- and Y2O3-alloyed, NiO-forming Ni-base alloys and La-, Mn-, and Ti-alloyed Fe-18Cr-9W and Fe-25Cr base ferritic Cr2O3-forming alloys were evaluated. The addition of Y2O3 and Li reduced the NiO scale growth rate and increased its electrical conductivity. The area-specific-resistance (ASR) values were comparable to those of the best (lowest ASR) ferritic alloys examined. Oxidation of the ferritic alloys at 800°C in air and air+10% H2O (water vapor) indicated that Mn additions resulted in faster oxidation kinetics/thicker oxide scales, but also lower oxide scale ASRs. Relative in-cell performance in model SOFC stacks operated at 850°C indicated a 60-80% reduction in ASR by Ni+Y2O3, Ni+Y 2O3, Li, and Fe-25Cr+La,Mn,Ti interconnects over those made from a baseline, commercial Cr2O3-forming alloy. Collectively, these results indicate that NiO-forming alloys show potential for use as metallic interconnects.

KW - CrO

KW - Electrical properties

KW - Metallic interconnect

KW - NiO

KW - Solid-oxide fuel cell

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