Degradation of La0.6Sr0.4Co0.2Fe0.8O3–δ–Ce0.8Sm0.2O1.9 Cathodes on Coated and Uncoated Porous Metal Supports

Harris, Jeffrey; Yan, Yu; Bateni, Reza; Kesler, Olivera

doi:10.1002/fuce.201500139

Cited by 9 publications

(3 citation statements)

References 33 publications

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“…The present study is focused on the metal support microstructure; however, it has been previously shown that the durability of metal‐supported cathode‐first cells is compromised by the tendency of Cr to volatilize and redeposit at the pore surfaces in oxidizing conditions typical of an SOFC cathode compartment. Harris et al reported that the degradation rate during operation was reduced by depositing La 2 O 3 or Y 2 O 3 reactive element oxide coatings on the pores of the metal support, which significantly decreased the extent of volatilization of Cr and a correspondingly decreased rate of degradation of cell performance . In a separate study, the application of reactive element oxides such as La 2 O 3 and Y 2 O 3 was also shown to be effective in decreasing the oxidation rate of metal supports at high temperatures typical of SOFC operation .…”

Section: Resultsmentioning

confidence: 99%

Development of Bi‐layer Metal Substrate Architectures for Suspension Plasma Sprayed Solid Oxide Fuel Cells

Arevalo-Quintero

Kesler

2018

Fuel Cells

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Metal‐supported solid oxide fuel cells have several advantages, which could potentially increase the overall competitiveness of the technology, compared to their cermet‐supported counterparts. However, surface imperfections and rapid oxidation of the metal supports at operating temperatures are factors that affect the electrochemical performance and durability of the cells. In this study, we have developed bi‐layer metal supports consisting of a thin, finely structured top layer and a thicker, more coarsely structured bottom layer. The fine top layer has small surface pore sizes which facilitate the deposition of defect‐free electrolyte layers, while the coarse layer provides greater open porosity and larger pore sizes to facilitate mass transport and to decrease the rate of oxidation. An open circuit voltage (OCV) as high as 1.105 V at 750 °C in 3% humidified hydrogen is reported in this study, which deviates from the Nernst potential by only 5 mV. This result shows that the bi‐layer support has the potential to minimize electrode and electrolyte defects, which are known to be detrimental to cell performance. In addition, the bi‐layer supports show better oxidation resistance compared to benchmark finely‐structured single‐layer supports fabricated in this study for comparison.

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Section: Resultsmentioning

confidence: 99%

Development of Bi‐layer Metal Substrate Architectures for Suspension Plasma Sprayed Solid Oxide Fuel Cells

Arevalo-Quintero

Kesler

2018

Fuel Cells

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“…Furthermore, it avoids intimate contact between the cathode and bare stainless steel, for which accelerated Cr deposition in the cathode would be a concern. Recently, MS-SOFCs with the cathode instead applied to a presintered stainless steel substrate by plasma spray deposition have been investigated; this avoids interdiffusion between Fe and Cr from the stainless steel and Ni from the anode [6,7].…”

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confidence: 99%

Durability of symmetric-structured metal-supported solid oxide fuel cells

Tucker

2017

Journal of Power Sources

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Symmetric-structure metal-supported solid oxide fuel cells (MS-SOFC) with YSZ electrolyte are fabricated with porous YSZ backbone electrodes, stainless steel supports, and infiltrated catalysts on both anode and cathode side. Durability towards aggressive thermal and redox cycling, and long-term operation is assessed. Many sealing material candidates are screened for compatibility with the cell materials and operating conditions, and a commercial sealing glass, GM31107, is selected. LSM/SDCN cells are then subjected to 200 very fast thermal cycles and 20 complete redox cycles, with minimal impact to cell performance. LSM/SDCN and SDCN/SDCN cells are operated for more than 1200 h at 700°C. The seal and cell hermeticity is maintained, and cell ohmic impedance does not change significantly during operation. Electrode polarization increases during operation, leading to significant degradation of the cell performance. In-operando EIS and post-mortem SEM/EDS analysis suggest that catalyst coarsening and cathode Cr deposition are the dominant degradation modes.

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“…Nonetheless, the increased cell temperature due to combustion would tend to accelerate SrZrO 3 interlayer formation. Lastly, Cr diffusion from the substrate into the functional layers of the cell is also a known degradation mode [61,62]. Cr and Fe migration have been observed from the substrate into an adjacent fuel electrode [62], which may explain degradation at 2000-4000 Hz in addition to 20-40 Hz.…”

Section: Short-term Durability Testingmentioning

confidence: 99%

Solid oxide cell electrolytes deposited by atmospheric suspension plasma spraying at high velocity and high temperature

Kuhn

Kesler

2023

Fuel Cells

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Metal-supported solid oxide cells with Yttria-stabilized zirconia (YSZ) electrolytes fabricated by atmospheric plasma spraying are routinely found to have open-circuit voltages (OCVs) below the Nernst potential due to gas crossover and combustion resulting from electrolyte defects. To improve splat bonding and reduce coating defects, YSZ electrolytes were fabricated here at >800 • C substrate temperatures and torch-substrate relative velocities of 4 and 12 m/s by atmospheric suspension plasma spraying. Electrolyte microstructures appeared dense, with porosities estimated to be approximately 2.2-3.5 vol%. Minimal segmentation cracking was observed on samples fabricated at 12 m/s. The full cells that were electrochemically tested had permeabilities in the range of 4-6 × 10 −19 m 2 , and the maximum recorded OCV was ∼26 mV below the Nernst potential for 750 • C. Potential performance gains from YSZ deposition at substrate temperatures >800 • C may have been masked by poor substrate-fuel electrode contact. Using electrochemical impedance spectroscopy, it was found that the ohmic and polarization resistances decreased and increased, respectively, over time. The calculated distribution of relaxation times of the tested cells, together with observations from the literature, were employed to identify possible cell degradation mechanisms observed during short-term durability testing.

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Degradation of La_0.6Sr_0.4Co_0.2Fe_0.8O_3–_δ–Ce_0.8Sm_0.2O_1.9 Cathodes on Coated and Uncoated Porous Metal Supports

Cited by 9 publications

References 33 publications

Development of Bi‐layer Metal Substrate Architectures for Suspension Plasma Sprayed Solid Oxide Fuel Cells

Development of Bi‐layer Metal Substrate Architectures for Suspension Plasma Sprayed Solid Oxide Fuel Cells

Durability of symmetric-structured metal-supported solid oxide fuel cells

Solid oxide cell electrolytes deposited by atmospheric suspension plasma spraying at high velocity and high temperature

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