Mn Co3O4 spinel coatings: Controlled synthesis and high temperature oxidation resistance behavior

“…The initial BPs are conventionally made of expensive and difficult-to-process materials (e.g., LaCrO 3 -based ceramics for SOC cells [21] and titanium plates for PEM cells [2,22]), accounting for ~30% and ~53% of the cost for SOC and PEM cells, respectively [2,23]. It is, therefore, of great interest to lower the cost by employing low-cost and easy-to-process alternative metal materials (e.g., ferritic stainless steels for SOC cells and stainless steels, aluminum or copper for PEM cells) [24,25]. Unfortunately, owing to the poor chemical stability, these candidate materials are susceptible to corrosion, resulting in a series of problems (such as Cr poisoning in SOCs, decrease in proton conductivity in PEM cells, etc.)…”

Section: Introductionmentioning

confidence: 99%

“…Similarly, rare-earth perovskite oxides [37,38] and spinel oxides [29] are the most commonly used materials to protect ferritic stainless-steels (FSS) BPs from corrosion in SOCs [14]. Apart from coating materials, coating technology (such as physical vapor deposition [31], electroplating [32] and metal nitriding methods [36] for PEMFC and PEMEC; slurry coating [24], magnetron sputtering (MS) [29] and electrophoretic deposition (EPD) [29] for SOCs) is another critical factor determining the coating performance because it directly affects the coating microstructure and composition. Currently, some coating materials have shown potential application prospects; for example, Nb-coated stainless steel BPs exhibited a low degradation rate (~5.5 µV h −1 ) during the 14,000 h electrolysis cell test [39].…”

Section: Introductionmentioning

confidence: 99%

Thermal Sprayed Protective Coatings for Bipolar Plates of Hydrogen Fuel Cells and Water Electrolysis Cells

Liu,

Tao,

Wang

et al. 2024

Coatings

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As one core component in hydrogen fuel cells and water electrolysis cells, bipolar plates (BPs) perform multiple important functions, such as separating the fuel and oxidant flow, providing mechanical support, conducting electricity and heat, connecting the cell units into a stack, etc. On the path toward commercialization, the manufacturing costs of bipolar plates have to be substantially reduced by adopting low-cost and easy-to-process metallic materials (e.g., stainless steel, aluminum or copper). However, these materials are susceptible to electrochemical corrosion under harsh operating conditions, resulting in long-term performance degradation. By means of advanced thermal spraying technologies, protective coatings can be prepared on bipolar plates so as to inhibit oxidation and corrosion. This paper reviews several typical thermal spraying technologies, including atmospheric plasma spraying (APS), vacuum plasma spraying (VPS) and high-velocity oxygen fuel (HVOF) spraying for preparing coatings of bipolar plates, particularly emphasizing the effect of spraying processes on coating effectiveness. The performance of coatings relies not only on the materials as selected or designed but also on the composition and microstructure practically obtained in the spraying process. The temperature and velocity of in-flight particles have a significant impact on coating quality; therefore, precise control over these factors is demanded.

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“…11 In addition, area-specific resistance (ASR) of FSSs under SOFC cathode conditions is mainly attributed to the Cr 2 O 3 layer; thus, the excessive growth of the Cr 2 O 3 layer also causes high ASR before spallation. 12 Besides, Cr-containing volatile species can be formed from the Cr-rich oxide layer, then causing cathode poisoning. 13 To solve these problems of FSS interconnects, a variety of protective coatings have been applied to the surface of interconnects.…”

Section: Introductionmentioning

confidence: 99%

Fabrication and Oxidation Behavior of the Cu–Fe Spinel Coating for SOFC Steel Interconnect Applications

Pan,

Liu,

Shi

et al. 2024

ACS Appl. Energy Mater.

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Cu−Fe spinel has recently attracted considerable interest as a protective coating for solid oxide fuel cell steel interconnects. In this study, Cu−Fe spinel coatings were deposited on SUS 430 steel substrates via a coating route of the dip-coating process. Oxidation tests were investigated in laboratory air at up to 800 °C for five (5) 24 h (24 h) cycles up to 120 h. The areaspecific resistance (ASR) of the samples was measured by a standard four-probe method. The experimental results indicated that the CuFe 2 O 4 spinel powders with fine grain size were successfully synthesized from the sol−gel method. The oxidation kinetics of Cu−Fe spinel-coated steel obeyed a parabolic law, showing a parabolic rate constant of 1.38 × 10 −14 g 2 cm −4 s −1 . The ASR value of the coated samples was about 11.2 mΩ cm 2 at 800 °C. The Cu−Fe spinel coating improved both the high-temperature oxidation resistance and the electrical conductivity of the steel interconnects.

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Mn Co3O4 spinel coatings: Controlled synthesis and high temperature oxidation resistance behavior

Cited by 21 publications

References 42 publications

Mn-Co spinel coatings on Crofer 22 APU by electrophoretic deposition: Up scaling, performance in SOFC stack at 850 °C and compositional modifications

Mn-Co spinel coatings on Crofer 22 APU by electrophoretic deposition: Up scaling, performance in SOFC stack at 850 °C and compositional modifications

Thermal Sprayed Protective Coatings for Bipolar Plates of Hydrogen Fuel Cells and Water Electrolysis Cells

Fabrication and Oxidation Behavior of the Cu–Fe Spinel Coating for SOFC Steel Interconnect Applications

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