Protective coating based on manganese–copper oxide for solid oxide fuel cell interconnects: Plasma spray coating and performance evaluation

Waluyo, Nurhadi S.; Park, Seong Sik; Song, Rak Hyun; Lee, Seungbok; Lim, Tak‐Hyoung; Hong, Jong‐Eun; Ryu, Ki‐Hyun; Im, Won Bin; Lee, Jong Won

doi:10.1016/j.ceramint.2018.03.220

Cited by 46 publications

(8 citation statements)

References 31 publications

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“…As shown in Figure 4b, the commercial Mn1.5Co1.5O endothermic peak at 1034 °C, while CuδMn1.5−xCo1.5−yO4 (δ = 0.1, 0.2, 0.3 endothermic peak. According to public reports [9,13,20,21], the formatio and MnCo2O4 is an exothermic process. Since the MnCo2O4 phase of Mn1.5Co1.5O4 powder showed no significant decomposition at 1034 °C, it the endothermic peak at 1034 °C was the result of the decomposition of thermore, in the range 1100-1300 °C, after increasing the amount of C shifted toward the left, and the stable temperature of the spinel phase DSC curves were found to gradually flatten and continuously exhausted in Figure 4c,d…”

Section: Solid Phase Reactionsmentioning

confidence: 99%

“…(Mn,Co) 3 O 4 spinel coating is often used to diminish the evaporation of Cr and thus reduce the performance degradation and prolong the service life of the stack. However, the theoretical conductivity of (Mn,Co) 3 O 4 spinel at elevated temperature is only 60 S/cm, which is much lower than that of the cathode material, such as LSCF > 200 S/cm at 600-800 • C [6][7][8][9]. Many efforts have been made to improve the conductivity of Mn-Co spinel coating.…”

Section: Introductionmentioning

confidence: 99%

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Highly Conductive Mn-Co Spinel Powder Prepared by Cu-Doping Used for Interconnect Protection of SOFC

et al. 2021

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Mn-Co Spinel is considered as one of the most promising materials for the interconnect protection of solid oxide fuel cells; however, its conductivity is too low to maintain a high cell performance as compared with cathode materials. Element doping is an effective method to improve the spinel conductivity. In this work, we proposed doping Mn-Co spinel powder with Cu via a solid phase reaction. CuδMn1.5−xCo1.5−yO4 with δ = 0.1, 0.2, 0.3, and x + y = δ was obtained. X-ray diffraction (XRD) and thermogravimetry-differential scanning calorimetry (TG-DSC) were used to evaluate the Cu-doping effect. After sintering at 1000 °C for 12 h, the yield exhibited the best crystallinity, density, and element distribution, with a phase composition of MnCo2O4/CuxMn3−xO4 (x = 1, 1.2, 1.4 or 1.5). X-ray photoelectron spectroscopy (XPS) was used to semi-quantitatively characterize the content changes in element valence states. The areal fraction of Mn2+ and Co3+ was found to decrease when the sintering duration increased, which was attributed to the decomposition of the MnCo2O4 phase. Finally, coatings were prepared by atmospheric plasma spraying with doped spinel powders and the raw powder Mn1.5Co1.5O4. It was found that Cu doping can effectively increase the conductivity of Mn-Co spinel coatings from 23 S/cm to 51 S/cm. Although the dopant Cu was found to be enriched on the surface of the coatings after the conductivity measurement, which restrained the doping effect, Cu doping remains a convenient method to significantly promote the conductivity of spinel coatings for SOFC applications.

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Section: Solid Phase Reactionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Highly Conductive Mn-Co Spinel Powder Prepared by Cu-Doping Used for Interconnect Protection of SOFC

et al. 2021

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“…Generally, protective coatings made of transition metal spinels show good stability and adhesion to metal substrate and, in comparison with rare-earth perovskites ones, a better ability to inhibit chromium diffusion [32]. Among these groups of compounds, Mn-Cu spinels have a higher electrical conductivity at high temperatures (e.g., Mn 1.7 Cu 1.3 O 4 about 225 S cm −1 at 750 • C) and lower cost than the more studied Mn-Co spinels; for this reason, the formers are recently receiving more attention [16,32,33].…”

Section: Introductionmentioning

confidence: 99%

On the High-Temperature Oxidation and Area Specific Resistance of New Commercial Ferritic Stainless Steels

Bongiorno

Spotorno

Paravidino

et al. 2021

Metals

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Two commercial ferritic stainless steels (FSSs), referred to as Steel A and Steel B, designed for specific high-temperature applications, were tested in static air for 2000 h at 750 °C to evaluate their potential as base materials for interconnects (ICs) in Intermediate Temperature Solid Oxide Fuel Cell stacks (IT-SOFCs). Their oxidation behavior was studied through weight gain and Area Specific Resistance (ASR) measurements. Additionally, the oxide scales developed on their surfaces were characterized by X-Ray Diffraction (XRD), Micro-Raman Spectroscopy (μ-RS), Scanning Electron Microscopy, and Energy Dispersive X-Ray Fluorescence Spectroscopy (SEM-EDS). The evolution of oxide composition, structure, and electrical conductivity in response to aging was determined. Comparing the results with those on AISI 441 FSS, steels A and B showed a comparable weight gain but higher ASR values that are required by the application. According to the authors, Steel A and B compositions need an adjustment (i.e., a plain substitution of the elements which form insulant oxides or a marginal modification in their content) to form a thermally grown oxide (TGO) with the acceptable ASR level.

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“…Among these materials, the perovskite oxides, such as the ones based on lanthanum chromite (LCr; LaCrO 3 ) 27 , strontium-doped lanthanum manganite (LSM; La 1-x Sr x MnO 3 ) 28 , strontium-doped lanthanum cobaltite (LSC; La 1-x Sr x CoO 3 ) 29 , and strontium-doped lanthanum ferrite (LSF; La 1-x Sr x FeO 3 ) 17 , are currently of great interest due to the possibility combining different elements to obtain an electrical conductivity compatible with the specifications of the ITSOFC 5 . The main methods used for coating applications are: dip coating 30 , chemical vapor deposition 31 , pulsed laser deposition 32 , plasma spraying 33,34 , screen printing, slurry coating 35 , sputtering 36,37 , electrodeposition 38 , and spray pyrolysis 29,39,40 .…”

Section: Introductionmentioning

confidence: 99%

Effect of High-Temperature Exposure on Degradation of La0.6Sr0.4CoO3 Coated Metallic Interconnects for ITSOFC and SOEC

et al. 2020

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Previous studies showed the formation of new phases affecting the electrical properties of LSC thin films deposited on stainless steel substrates, which are commonly tested for ITSOFC and SOEC interconnects. A 4.3 μm thick La 0.6 Sr 0.4 CoO 3 coating was deposited on AISI430 steel by spray pyrolysis, followed by heat treatment (800°C/2h) and an oxidation in air (800°C/96h). The La 0.6 Sr 0.4 CoO 3 phase interacted with the metallic substrate and formed SrCrO 4 , causing degradation of the perovskite into La 0.9 Sr 0.1 CoO 3 . An EDS mapping showed Sr and Cr enrichment in the coating/substrate interface. TG analysis indicated a lower mass gain for the coated substrate. The total ASR at 800°C of the interconnect before and after oxidation was 3.23 Ω.cm 2 and 3.98 Ω.cm 2 , respectively. The Ea underwent very small variation, remaining around 0.24 eV (T≤300°C) and 0.65 eV (T≥400°C). The reaction of Cr from the substrate and Sr from LSC seems to have impaired the performance of the interconnect.

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Protective coating based on manganese–copper oxide for solid oxide fuel cell interconnects: Plasma spray coating and performance evaluation

Cited by 46 publications

References 31 publications

Highly Conductive Mn-Co Spinel Powder Prepared by Cu-Doping Used for Interconnect Protection of SOFC

Highly Conductive Mn-Co Spinel Powder Prepared by Cu-Doping Used for Interconnect Protection of SOFC

On the High-Temperature Oxidation and Area Specific Resistance of New Commercial Ferritic Stainless Steels

Effect of High-Temperature Exposure on Degradation of La0.6Sr0.4CoO3 Coated Metallic Interconnects for ITSOFC and SOEC

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