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Three-dimensional thermal stress analysis of the re-oxidized Ni-YSZ anode functional layer in solid oxide fuel cells
Korea Univ, South Korea.
Korea Univ, South Korea; KIST, South Korea.
Korea Univ, South Korea.
KIST, South Korea; Korea Univ Sci and Technol UST, South Korea.
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2018 (English)In: Journal of Alloys and Compounds, ISSN 0925-8388, E-ISSN 1873-4669, Vol. 752, p. 148-154Article in journal (Refereed) Published
Abstract [en]

Nickel-yttria-stabilized zirconia (Ni-YSZ) cermet is widely used as an anode material in solid oxide fuel cells (SOFCs); however, Ni re-oxidation causes critical problems due to volume expansion, which causes high thermal stress. We fabricated a Ni-YSZ anode functional layer (AFL), which is an essential component in high-performance SOFCs, and re-oxidized it to investigate the related three-dimensional (3D) microstructural and thermo-mechanical effects. A 3D model of the re-oxidized AFL was generated using focused ion beam-scanning electron microscope (FIB-SEM) tomography. Re-oxidation of the Ni phase caused significant volumetric expansion, which was confirmed via image analysis and calculation of the volume fraction, connectivity, and two-phase boundary density. Finite element analysis (FEA) with simulated heating to 500-900 degrees C confirmed that the thermal stress in re-oxidized Ni-YSZ is concentrated at the boundaries between YSZ and re-oxidized NiO (nickel oxide). NiO is subjected to more stress than YSZ. Stress exceeding the fracture stress of 8 mol% YSZ appears primarily at 800 degrees C or higher. The stress is also more severe near the electrolyte-anode boundary than in the Ni-YSZ cermet and the YSZ regions. This may be responsible for the electrolyte membrane delamination and fracture that are observed during high-temperature operation. (C) 2018 Elsevier B.V. All rights reserved.

Place, publisher, year, edition, pages
ELSEVIER SCIENCE SA , 2018. Vol. 752, p. 148-154
Keywords [en]
NiO-YSZ anode functional layer; 3D reconstruction; Focused ion beam-scanning electron microscope; Finite element analysis; Thermal stress
National Category
Other Materials Engineering
Identifiers
URN: urn:nbn:se:liu:diva-148361DOI: 10.1016/j.jallcom.2018.04.176ISI: 000432672300019OAI: oai:DiVA.org:liu-148361DiVA, id: diva2:1219066
Note

Funding Agencies|Korean Ministry of Environment (MOE) as a "Public Technology Program based on Environmental Policy" [E416-00070-0604-0]; National Research Foundation of Korea - Korean government (MSIP) [NRF-2016R1D1A1B03932377]

Available from: 2018-06-15 Created: 2018-06-15 Last updated: 2018-06-15

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