CeO2-doped (Co,Mn)3O4 coatings for protecting solid oxide fuel cell interconnect alloys

Zhu, J.H.; Lewis, M. J.; Du, Shiwen; Li, Y.T.

doi:10.1016/j.tsf.2015.07.085

Cited by 35 publications

(14 citation statements)

References 36 publications

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“…In order to minimize the electrical resistance of produced oxides and solve the problem of Cr poisoning, some coatings have been developed, such as reactive elements oxide coating [3], rare earth perovskite coating [4,5] and composite spinel oxide coating [6,7], for metallic interconnects. Mn-Co based spinel coatings have been largely studied owing to their high electrical conductivity, excellent chromium retention capability, and thermal matched expansion coefficient with steel substrate.…”

Section: Introductionmentioning

confidence: 99%

Thermal Growth Cu1.2Mn1.8O4 Spinel Coatings on Metal Interconnects for Solid Oxide Fuel Cell Applications

Guo

Lai

Shao

et al. 2017

Metals

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A novel cobalt-free Cu 1.2 Mn 1.8 O 4 spinel coating is prepared and evaluated for the metal interconnect of solid oxide fuel cell. Mn-35Cu and Co-35Mn alloy coatings are deposited on 430 SS substrate and then in-situ oxidized in air at 750 • C for 100 h. XRD results confirm that Cu 1.2 Mn 1.8 O 4 spinel with some Mn 2 O 3 is formed, and the average thickness of the coating is 70-80 µm according to cross section image. Spinel oxide coating is compact and has good adherence to the substrate, and very low Cr and Fe contents are detected in the coating. A small area specific resistance of 8.7 mΩ cm 2 is achieved at 800 • C for the composited Cu 1.2 Mn 1.8 O 4 spinel coating, which is much less than that of the composited (Co,Mn) 3 O 4 spinel coating. The research indicates that the Cu 1.2 Mn 1.8 O 4 coating evolved by the high-energy micro-arc alloying process is a promising coating material for the metallic interconnects.

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Section: Introductionmentioning

confidence: 99%

Thermal Growth Cu1.2Mn1.8O4 Spinel Coatings on Metal Interconnects for Solid Oxide Fuel Cell Applications

Guo

Lai

Shao

et al. 2017

Metals

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“…Fe doping can reduce the growth of Cr 2 O 3 film and improve the oxidation resistance, but this reduces the conductivity of spinel coatings [10][11][12][13]. Ce doping can enhance the adhesion and improve the interfacial stability of oxide film, but the effects depend on the substrate materials [14][15][16]. Cu doping can improve the conductivity and adjust the thermal expansion coefficient of spinel coatings [17][18][19].…”

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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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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“…Chen et al manufactured a (La 0.8 Sr 0.2 ) 0.98 MnO 3 protective layer on the C276, Crofer22, APU, SUS304, and SUS430 alloys by the atmospheric plasma spraying technique to decrease area specific resistance (ASR). Zhu et al synthesized a CeO 2 -doped (Co,Mn) 3 O 4 coating on a Crofer 22 APU alloy substrate by an electrolytic codeposition method to improve the stability of the alloy interconnect. Xu et al obtained a Cu-doped Mn–Co spinel protective coating on Crofer 22 APU via a citric acid–nitrate method to optimize antioxidation performance of Crofer 22 APU.…”

Section: Introductionmentioning

confidence: 99%

Impact of Different Atmospheres on Oxidation and Electrical Performance of a Solid Oxide Fuel Cell Interconnect with Co-Containing Protective Coating

Liu

Shi

et al. 2020

Energy Fuels

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Chromium (Cr) evaporation of ferritic stainless steel (FSS) interconnects is considered to be the main reason for severe deterioration of solid oxide fuel cells (SOFCs). To suppress the influence of Cr evaporation, the development of a protective coating material on the FSS interconnects has been proved to be an effective way. Herein, we prepare a Co-containing protective coating via a facile pack cementation technique in different atmospheres on an AISI 430 FSS interconnect. The obtained coating is valid for enhancing the oxidation resistance and electrical performance of the FSS interconnect. After the isothermal oxidation test, the weight gain of the coated sample in Ar (0.415 mg/cm2) is smaller than that of uncoated (1.613 mg/cm2) and coated samples in air (0.498 mg/cm2). In addition, after the area specific resistance (ASR) test, the coated sample (73.68 mΩ cm2) in Ar has the lowest ASR compared with the uncoated (236.88 mΩ cm2) and coated samples in air (96.32 mΩ cm2). These results indicate that the formation of the CoFe2O4 spinel layer heightens oxidation resistance and electrical properties through preventing the outward diffusion of Cr3+ and inward diffusion of O2–. This work verifies that the Co-containing protective coating prepared in Ar is a promising coating material for SOFC applications.

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CeO2-doped (Co,Mn)3O4 coatings for protecting solid oxide fuel cell interconnect alloys

Cited by 35 publications

References 36 publications

Thermal Growth Cu1.2Mn1.8O4 Spinel Coatings on Metal Interconnects for Solid Oxide Fuel Cell Applications

Thermal Growth Cu1.2Mn1.8O4 Spinel Coatings on Metal Interconnects for Solid Oxide Fuel Cell Applications

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

Impact of Different Atmospheres on Oxidation and Electrical Performance of a Solid Oxide Fuel Cell Interconnect with Co-Containing Protective Coating

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