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Title: Chromium Vaporization Reduction by Nickel Coatings For SOEC Interconnect Materials

Abstract

The vaporization of Cr-rich volatile species from interconnect materials is a major source of degradation that limits the lifetime of planar solid oxide devices systems with metallic interconnects, including Solid Oxide Electrolysis Cells, or SOECs. Some metallic coatings (Ni, Co, and Cu) significantly reduce the Cr release from interconnects and slow down the oxide scale growth on the steel substrate. To shed additional light upon the mechanisms of such protection and find a suitable coating material for ferritic stainless steel materials, we used a combination of first-principles calculations, thermodynamics, and diffusion modeling to investigate which factors determine the quality of the Ni metallic coating at stainless steel interconnector. We found that the Cr migration in Ni coating is determined by a delicate combination of the nickel oxidation, Cr diffusion, and phase transformation processes. Although the formation of Cr2O3 oxide is more exothermic than that of NiO, the kinetic rate of the chromia formation in the coating layer and its surface is significantly reduced by the low mobility of Cr in nickel oxide and in NiCr2O4 spinel. These results are in a good agreement with diffusion modeling for Cr diffusion through Ni coating layer on the ferritic 441 steel substrate.

Authors:
; ;
Publication Date:
Research Org.:
Idaho National Laboratory (INL)
Sponsoring Org.:
DOE - NE
OSTI Identifier:
1156916
Report Number(s):
INL/JOU-13-30115
DOE Contract Number:
DE-AC07-05ID14517
Resource Type:
Journal Article
Resource Relation:
Journal Name: International Journal of Hydrogen Energy; Journal Volume: 39; Journal Issue: 27
Country of Publication:
United States
Language:
English
Subject:
99 GENERAL AND MISCELLANEOUS; chromium vaporization; SOEC Interconnect Materials

Citation Formats

Michael V. Glazoff, Sergey N. Rashkeev, and J. Stephen Herring. Chromium Vaporization Reduction by Nickel Coatings For SOEC Interconnect Materials. United States: N. p., 2014. Web.
Michael V. Glazoff, Sergey N. Rashkeev, & J. Stephen Herring. Chromium Vaporization Reduction by Nickel Coatings For SOEC Interconnect Materials. United States.
Michael V. Glazoff, Sergey N. Rashkeev, and J. Stephen Herring. Mon . "Chromium Vaporization Reduction by Nickel Coatings For SOEC Interconnect Materials". United States. doi:.
@article{osti_1156916,
title = {Chromium Vaporization Reduction by Nickel Coatings For SOEC Interconnect Materials},
author = {Michael V. Glazoff and Sergey N. Rashkeev and J. Stephen Herring},
abstractNote = {The vaporization of Cr-rich volatile species from interconnect materials is a major source of degradation that limits the lifetime of planar solid oxide devices systems with metallic interconnects, including Solid Oxide Electrolysis Cells, or SOECs. Some metallic coatings (Ni, Co, and Cu) significantly reduce the Cr release from interconnects and slow down the oxide scale growth on the steel substrate. To shed additional light upon the mechanisms of such protection and find a suitable coating material for ferritic stainless steel materials, we used a combination of first-principles calculations, thermodynamics, and diffusion modeling to investigate which factors determine the quality of the Ni metallic coating at stainless steel interconnector. We found that the Cr migration in Ni coating is determined by a delicate combination of the nickel oxidation, Cr diffusion, and phase transformation processes. Although the formation of Cr2O3 oxide is more exothermic than that of NiO, the kinetic rate of the chromia formation in the coating layer and its surface is significantly reduced by the low mobility of Cr in nickel oxide and in NiCr2O4 spinel. These results are in a good agreement with diffusion modeling for Cr diffusion through Ni coating layer on the ferritic 441 steel substrate.},
doi = {},
journal = {International Journal of Hydrogen Energy},
number = 27,
volume = 39,
place = {United States},
year = {Mon Sep 01 00:00:00 EDT 2014},
month = {Mon Sep 01 00:00:00 EDT 2014}
}
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