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Title: H 2 O Absorption Assisted Sr-Segregation in Strontium Nickel Oxide Based Chromium Getter and Encapsulation with SrCO 3

Abstract

Chromium getters composed of strontium nickel oxide (Sr 9Ni 7O 21) offer a cost-effective pathway for the mitigation of cathode poisoning in solid oxide fuel cells by capturing gaseous chromium species. The getter material, however, remains prone to chemical and structural changes in humid environments. Experimental observations indicate that Sr is segregated by absorbing H 2O molecules and the resulting Sr-deficient phase is transformed into SrNiO 3. Investigations reveal that the Sr-segregation is attributed not only to the hygroscopic nature of Sr but also to the compressive stress and 1D arrangement of Sr-ions in the structure. The formation of Sr(OH) 2∙8H 2O by moisture absorption accompanies volume expansion, resulting in crack formation. To improve the resistance to moisture attack, the surface is modified with SrCO 3 layer by CO 2-treatment. Experimental observations confirm that the SrCO 3 passivation layer effectively restrains the moisture absorption and accompanied structural changes. The Cr-gettering capability of the SrCO 3 layer on strontium nickel oxide is experimentally and thermodynamically verified.

Authors:
; ; ; ; ORCiD logo
Publication Date:
Research Org.:
Univ. of Connecticut, Storrs, CT (United States)
Sponsoring Org.:
USDOE Office of Fossil Energy (FE)
OSTI Identifier:
1490154
Alternate Identifier(s):
OSTI ID: 1614213
Grant/Contract Number:  
FE0023385
Resource Type:
Journal Article: Published Article
Journal Name:
Journal of the Electrochemical Society
Additional Journal Information:
Journal Name: Journal of the Electrochemical Society Journal Volume: 166 Journal Issue: 2; Journal ID: ISSN 0013-4651
Publisher:
IOP Publishing - The Electrochemical Society
Country of Publication:
United States
Language:
English
Subject:
25 ENERGY STORAGE; Electrochemistry; Materials Science

Citation Formats

Hong, Junsung, Heo, Su Jeong, Aphale, Ashish N., Hu, Boxun, and Singh, Prabhakar. H 2 O Absorption Assisted Sr-Segregation in Strontium Nickel Oxide Based Chromium Getter and Encapsulation with SrCO 3. United States: N. p., 2019. Web. doi:10.1149/2.0351902jes.
Hong, Junsung, Heo, Su Jeong, Aphale, Ashish N., Hu, Boxun, & Singh, Prabhakar. H 2 O Absorption Assisted Sr-Segregation in Strontium Nickel Oxide Based Chromium Getter and Encapsulation with SrCO 3. United States. https://doi.org/10.1149/2.0351902jes
Hong, Junsung, Heo, Su Jeong, Aphale, Ashish N., Hu, Boxun, and Singh, Prabhakar. Wed . "H 2 O Absorption Assisted Sr-Segregation in Strontium Nickel Oxide Based Chromium Getter and Encapsulation with SrCO 3". United States. https://doi.org/10.1149/2.0351902jes.
@article{osti_1490154,
title = {H 2 O Absorption Assisted Sr-Segregation in Strontium Nickel Oxide Based Chromium Getter and Encapsulation with SrCO 3},
author = {Hong, Junsung and Heo, Su Jeong and Aphale, Ashish N. and Hu, Boxun and Singh, Prabhakar},
abstractNote = {Chromium getters composed of strontium nickel oxide (Sr9Ni7O21) offer a cost-effective pathway for the mitigation of cathode poisoning in solid oxide fuel cells by capturing gaseous chromium species. The getter material, however, remains prone to chemical and structural changes in humid environments. Experimental observations indicate that Sr is segregated by absorbing H2O molecules and the resulting Sr-deficient phase is transformed into SrNiO3. Investigations reveal that the Sr-segregation is attributed not only to the hygroscopic nature of Sr but also to the compressive stress and 1D arrangement of Sr-ions in the structure. The formation of Sr(OH)2∙8H2O by moisture absorption accompanies volume expansion, resulting in crack formation. To improve the resistance to moisture attack, the surface is modified with SrCO3 layer by CO2-treatment. Experimental observations confirm that the SrCO3 passivation layer effectively restrains the moisture absorption and accompanied structural changes. The Cr-gettering capability of the SrCO3 layer on strontium nickel oxide is experimentally and thermodynamically verified.},
doi = {10.1149/2.0351902jes},
url = {https://www.osti.gov/biblio/1490154}, journal = {Journal of the Electrochemical Society},
issn = {0013-4651},
number = 2,
volume = 166,
place = {United States},
year = {2019},
month = {1}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at https://doi.org/10.1149/2.0351902jes

Citation Metrics:
Cited by: 2 works
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Works referenced in this record:

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    Works referencing / citing this record:

    Chromium Poisoning of La 1-x Sr x MnO 3±δ Cathodes and Electrochemical Validation of Chromium Getters in Intermediate Temperature-Solid Oxide Fuel Cells
    journal, January 2019