Evaluation of pulse electroplated cobalt/yttrium oxide composite coating on the Crofer 22 APU stainless steel interconnect

Saeidpour, Fatemeh; Zandrahimi, Morteza; Ebrahimifar, Hadi

doi:10.1016/j.ijhydene.2018.12.062

Cited by 34 publications

(8 citation statements)

References 50 publications

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“…26 E a was determined to be 0.26ev (25.08 KJ mol −1 ) for the uncoated sample. This result is nearly identical to the value reported by Saeidpour 68 for Crofer 22 APU steel. The value of E a for the Mn-Co and Mn-Co-CeO 2 coated samples was 0.17 (16.72 KJ mol −1 ) and 0.12ev (11.58 KJ mol −1 ), respectively.…”

Section: ⎛ ⎝supporting

confidence: 91%

Development of Mn-Co and Mn-Co-CeO₂ Coatings on Crofer 22 APU Steel for Solid Oxide Fuel Cell Interconnects

Mohsenifar,

Irannejad,

Ebrahimifar

2023

J. Electrochem. Soc.

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The present study compared the performance of uncoated, Mn-Co and Mn-Co-CeO2-coated Crofer 22 APU ferritic stainless steel interconnects. The samples were oxidized for 500 h in an electric furnace at 800 °C. The surface morphology and phase structure of the samples before and after oxidation were examined using FESEM microscopy and X-ray diffraction (XRD) analysis, respectively. The electrical conductivity evaluation of the samples was also conducted by measuring the area specific resistance (ASR). The results indicated that the weight gain of the uncoated, Mn-Co and Mn-Co-CeO2-coated samples after 500 h of oxidation was 0.55, 0.58 and 0.27 mg.cm−2, respectively. Additionally, a comparison of the oxidation kinetics of the experimental samples revealed that the oxidation rate constant of the Mn-Co-CeO2-coated steel is 10 and 40 times lower than that of the Mn-Co-coated and uncoated steel, respectively. XRD analysis of the samples after oxidation confirmed the presence of MnCo2O4, Co3O4, and (Mn,Cr,Co)3O4 in the oxidized Mn-Co-coated, MnCo2O4, Co3O4, and CeO2 in the oxidized Mn-Co-CeO2-coated, and the chromium-containing phases (FeCr2O4, MnCr2O4, and Cr2O3) in the oxidized uncoated samples. The presence of phases with high electrical conductivity in the oxidized coated samples reduced their activation energy for conduction compared to the oxidized uncoated sample.

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Section: ⎛ ⎝supporting

confidence: 91%

Development of Mn-Co and Mn-Co-CeO₂ Coatings on Crofer 22 APU Steel for Solid Oxide Fuel Cell Interconnects

Mohsenifar,

Irannejad,

Ebrahimifar

2023

J. Electrochem. Soc.

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“…In this work, the oxidation behavior of one ferritic stainless steel, i.e., Crofer 22 APU, is investigated. The chemical composition of Crofer 22 APU [47] is listed in Table 1. Although small amounts of adding elements exist in Crofer 22 APU, we assume that they neither influence the diffusion of Cr in the matrix phase nor alter the composition of Cr oxide.…”

Section: Methodsmentioning

confidence: 99%

Phase Field Study of Cr-Oxide Growth Kinetics in the Crofer 22 APU Alloy Supported by Wagner’s Theory

Wang

Spatschek

2023

Energies

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The Crofer 22 APU alloy is a frequently used metallic material to manufacture interconnects in solid oxide fuel cells. However, the formation and evaporation of Cr2O3 not only increases the electrical resistance but also leads to the Cr-related degradation over the service time. In order to investigate the growth kinetics of Cr-oxide, i.e., Cr2O3, the multi-phase field model coupled with reliable CALPHAD databases is employed. The phase field simulation results are benchmarked with the predictions of Wagner’s theory. Moreover, we evidence the influence of the temperature and Cr concentration on the ferritic matrix phase and the oxygen concentration at the Cr2O3/gas interface on the growth kinetics of Cr-oxide, paving the way for further investigations of Cr-related solid oxide fuel cell degradation processes.

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“…Rare-earth (RE) elements, composed of 15 lanthanides plus yttrium and scandium, have played an essential role in many high-tech fields because of their unique electronic, magnetic, and optical properties. − For instance, yttrium (Y) exhibits remarkable resistance to alloy corrosion and enhanced electrical conductivity in ferritic stainless steels. − Due to similar physical and chemical properties, separating individual RE elements from their mixtures remains challenging . Solvent extraction is extensively utilized to separate RE elements because of its continuous and robust production capacity. , However, hydrochloric acid is usually produced and accumulated in the aqueous phase during the cation-exchange reaction, hindering RE elements’ extraction.…”

Section: Introductionmentioning

confidence: 99%

Acid-Resistant Nanofiltration Facilitated Nonsaponified Extraction of Rare-Earth Elements

Lai

Bai

et al. 2023

Ind. Eng. Chem. Res.

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The conventional extraction of rare-earth (RE) elements by alkali saponification consumes plenty of alkalis and produces enormous amounts of salt effluents. Herein, we proposed a novel environmentally friendly nonsaponified RE extraction process facilitated by an acid-resistant nanofiltration (NF) membrane, in which the nonsaponified organic phase directly is extracted with the RE feed repeatedly by a multistage cross-current approach and the exchanged acid in the raffinate is removed by the acid-resistant NF membrane with the deacidified raffinate recycled for nonsaponified extraction. Using YCl3 as the model sample, the feed RE concentration of the nonsaponified extraction was optimized in the range of 0.1–1.0 mol L–1, and a high RE concentration of 0.21 mol L–1 in the organic phase and an average extraction rate of 89.8% were obtained after seven-stage extraction at a RE feed concentration of 0.1 mol L–1. In total, 99% of the acid in the raffinate was removed by the commercial Duracid NF1812 acid-resistant NF membrane under an optimized RECl3 concentration of 4.9 g L–1, along with a recovered pH value of ∼3, resulting in a high total RE yield of 99.6%. The acid-resistant NF-facilitated nonsaponified extraction process featuring a high RE extraction rate and organic RE concentration, the absence of alkali consumption and salinity effluent emission, and eco-recycling of the raffinate renders the separation of RE elements a versatilely sustainable and green process.

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Evaluation of pulse electroplated cobalt/yttrium oxide composite coating on the Crofer 22 APU stainless steel interconnect

Cited by 34 publications

References 50 publications

Development of Mn-Co and Mn-Co-CeO₂ Coatings on Crofer 22 APU Steel for Solid Oxide Fuel Cell Interconnects

Development of Mn-Co and Mn-Co-CeO₂ Coatings on Crofer 22 APU Steel for Solid Oxide Fuel Cell Interconnects

Phase Field Study of Cr-Oxide Growth Kinetics in the Crofer 22 APU Alloy Supported by Wagner’s Theory

Acid-Resistant Nanofiltration Facilitated Nonsaponified Extraction of Rare-Earth Elements

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Evaluation of pulse electroplated cobalt/yttrium oxide composite coating on the Crofer 22 APU stainless steel interconnect

Cited by 34 publications

References 50 publications

Development of Mn-Co and Mn-Co-CeO2 Coatings on Crofer 22 APU Steel for Solid Oxide Fuel Cell Interconnects

Development of Mn-Co and Mn-Co-CeO2 Coatings on Crofer 22 APU Steel for Solid Oxide Fuel Cell Interconnects

Phase Field Study of Cr-Oxide Growth Kinetics in the Crofer 22 APU Alloy Supported by Wagner’s Theory

Acid-Resistant Nanofiltration Facilitated Nonsaponified Extraction of Rare-Earth Elements

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Product

Resources

About

Development of Mn-Co and Mn-Co-CeO₂ Coatings on Crofer 22 APU Steel for Solid Oxide Fuel Cell Interconnects

Development of Mn-Co and Mn-Co-CeO₂ Coatings on Crofer 22 APU Steel for Solid Oxide Fuel Cell Interconnects