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Physico-electrochemical properties and long-term stability of Mn1.45-0.5xCo1.45-0.5xCuxY0.1O4 spinel protective coatings on commercial metallic interconnects for solid oxide fuel cells

Title
Physico-electrochemical properties and long-term stability of Mn1.45-0.5xCo1.45-0.5xCuxY0.1O4 spinel protective coatings on commercial metallic interconnects for solid oxide fuel cells
Authors
Thaheem, ImdadullahJoh, Dong WooNoh, TaiminIm, Ha-NiLee, Kang Taek
DGIST Authors
Thaheem, Imdadullah; Joh, Dong Woo; Noh, Taimin; Im, Ha-Ni; Lee, Kang Taek
Issue Date
2021-04
Citation
Journal of Industrial and Engineering Chemistry, 96, 315-321
Type
Article
Author Keywords
Solid oxide fuel cellsInterconnectSpinel coating layerOxidation resistanceLong-term stability
Keywords
Amino acidsCeramic coatingsCopper compoundsElectric conductivityFerritic stainless steelManganese compoundsProtective coatingsRate constantsReaction intermediatesSinteringThermal expansionEffects of Cu contentElectrical conductivityGlycine nitrate processHigh electrical conductivityIntermediate temperaturesLong term stabilityMetallic interconnectsOrders of magnitudeSolid oxide fuel cells (SOFC)
ISSN
1226-086X
Abstract
The application of ceramic coatings has been presented as an effective method to suppress the oxidation scale growth and Cr evaporation of ferritic stainless steels used in solid oxide fuel cell (SOFC) interconnects. In this work, Mn1.45-0.5xCo1.45-0.5xCuxY0.1O4 materials with various Cu contents (x = 0.1, 0.3, and 0.5) were synthesized through a facile glycine nitrate process as a protective coating on a metallic interconnect (SUS 441). It was observed that the lattice parameter decreased from 8.31 Å (x = 0.1) to 8.22 Å (x = 0.5) with increasing Cu content (x). The effects of Cu content (x) on the phase stability as well as sintering, electrical, and thermal expansion were investigated. The results confirmed that the Mn1.3Co1.3Cu0.3Y0.1O4 spinel had the highest electrical conductivity of 115 S cm−1 at 800 °C and an average thermal expansion value of 11.98 × 10−6 K−1 in the temperature range of 20–1000 °C. The ASR of Mn1.3Co1.3Cu0.3Y0.1O4 coated SUS441 (7.7 × 10−5 Ω-cm2 at 800 °C) was 3 orders of magnitude lower than that of the uncoated sample. Moreover, the Mn1.3Co1.3Cu0.3Y0.1O4 coated interconnect exhibited excellent long-term stability up to 1000 h at 800 °C without any observable degradation, while the ASR of the uncoated sample increased by >850% for 1000 h (from 0.001 Ω-cm2 to 0.06 Ω-cm2) under the same conditions. The oxidation kinetics obeying the parabolic law with a rate constant of Mn1.3Co1.3Cu0.3Y0.1O4 (1.64 × 10−9 mg2 cm−4 s−1) was 4 orders of magnitude lower than that of bare SUS 411 (7.4 × 10−5 mg2 cm−4 s−1) at 750 °C for 2000 h. These results demonstrate that the Mn1.3Co1.3Cu0.3Y0.1O4 is a promising coating material with high electrical conductivity and excellent durability for metallic interconnects of intermediate-temperature SOFCs. © 2021 The Korean Society of Industrial and Engineering Chemistry
URI
http://hdl.handle.net/20.500.11750/13496
DOI
10.1016/j.jiec.2021.01.031
Publisher
한국공업화학회
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