The Role of Thin Functional Layers in Solid Oxide Fuel Cells

Molin, Sebastian; Karczewski, Jakub; Szymczewska, Dagmara; Jasiński, Piotr

doi:10.1016/j.electacta.2016.04.075

Cited by 25 publications

(15 citation statements)

References 45 publications

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“…[4][5][6][7] The high ionic conductivity and thermal stability have attracted great interest for applications such as gas sensors, solid state energy conversion membranes, and electrolyte or anode materials for intermediatetemperature solid oxide fuel cells (IT-SOFCs). [8][9][10][11][12] On the other hand, the capability of switching between Ce 3þ and Ce 4þ under oxidizing and reducing environments makes this material very attractive for technological applications in catalysis and photocatalysis. [6,[13][14][15][16] The use of nanostructured thin films increases the potential applications of this material.…”

Section: Introductionmentioning

confidence: 99%

Visible Emission on Nanostructured CeO₂ Thin Films Obtained by Spray Pyrolysis

Sánchez

Rosas

García

et al. 2020

Physica Status Solidi (a)

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Herein, the influence of the flow rate, substrate temperature, and thermal annealing at 700 C on the optical and structural parameters of nanostructured ceria thin films prepared by ultrasonic spray pyrolysis is evaluated. The morphology, structure, and optical properties are studied by scanning electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy (XPS), and photoluminescence (PL). The spray conditions are optimized for obtaining smooth, dense, and homogeneous nanocrystalline films with grain sizes smaller than 20 nm. XPS demonstrates a high percentage (%40%) of Ce 3þ in the films, even in heat-treated films (%25%). The Ce 3þ concentration does not depend on the growth temperature. Intense peaks at 575 and 618 nm are observed in PL measurements. These peaks are not reported in pure ceria thin films, they are dependent on the growth parameters (director and carrier gas flow rates and substrate temperature), and they are associated with levels produced by oxygen defects in the films. Variations in the flow rate modify the optimal temperature and the kinetic reaction, which also modifies the preferential orientation and the defect distribution in the films.

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Section: Introductionmentioning

confidence: 99%

Visible Emission on Nanostructured CeO₂ Thin Films Obtained by Spray Pyrolysis

Sánchez

Rosas

García

et al. 2020

Physica Status Solidi (a)

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“…Our previous study has shown that the optimum thickness of the functional layer should be around 120-150 nm for both symmetrical cells [11] and fuel cells [12]. The improvement in polarization resistance was obtained by using an electrode with dominating electronic conductivity (LaNi 0.6 Fe 0.4 O 3-δ , LNF) and for the cathode with mixed conducting LSCF as a thin cathode layer.…”

Section: Introductionmentioning

confidence: 99%

Nanocrystalline cathode functional layer for SOFC

Karczewski

Szymczewska

Jasiński

2017

Electrochimica Acta

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Recently, it was shown that thin functional layers introduced between an electrolyte and cathode might improve cathode performance. However, the mechanism of this improvement still needs analysis. In this paper, a thin (~140 nm), spin-coated perovskite layer (La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3-δ) was placed between a cathode (La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3-δ) and an electrolyte (Ce 0.8 Gd 0.2 O 2-δ) and the effects of this investigated. The microstructure of this layer was varied in order to determine its impact on the electrical and electrochemical properties. It has been shown that a mesoporous, nanocrystalline layer increases the active area for oxygen reduction and charge transfer through the cathode/electrolyte interface, which improves performance. Moreover, the stability of the cathode from thermal stresses is increased. In contrast, the coarsening of the grain and the layer densification has a reduced impact on the cathode performance.

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“…It tends to segregate at Cr-Mn grain boundaries, blocking the diffusion path for oxygen and so decreasing the oxidation rate [26]. CeO2 coatings of various thicknesses demonstrated a decrease in oxidation rate [27]. However, in that study, no Cr evaporation measurement was conducted.…”

Section: Introductionmentioning

confidence: 88%

In-Situ Observation of Co-Ce Coated Metallic Interconnect Oxidation Combined with High-Resolution Post Exposure Analysis

et al. 2017

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Oxidation of Sanergy SSHT steel with Ce-Co coating, used as interconnect material, was observed in-situ in a modified environmental scanning electron microscope (ESEM) at nominal temperature between 800°C and 900°C under 33Pa of oxygen, for different durations (up to 60h). After these in-situ observations, lamellas of the observed target areas were prepared using a focused ion beam (FIB). This allowed the evaluation in the cross section of the final composition of the oxidation layers of the steel by scanning transmission electron microscopy (STEM) and energy dispersive x-ray analysis (EDX), of the same zone observed directly on the surface by ESEM. Results show the diffusion of manganese and iron towards the cobalt coating. Underneath, chromia scale forms. Under the applied conditions, the very thin cerium layer does not prevent the diffusion of other elements from the steel. Niobium (with silicium) and titanium form oxidized precipitates in the steel just below the chromia scale.

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The Role of Thin Functional Layers in Solid Oxide Fuel Cells

Cited by 25 publications

References 45 publications

Visible Emission on Nanostructured CeO₂ Thin Films Obtained by Spray Pyrolysis

Visible Emission on Nanostructured CeO₂ Thin Films Obtained by Spray Pyrolysis

Nanocrystalline cathode functional layer for SOFC

In-Situ Observation of Co-Ce Coated Metallic Interconnect Oxidation Combined with High-Resolution Post Exposure Analysis

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The Role of Thin Functional Layers in Solid Oxide Fuel Cells

Cited by 25 publications

References 45 publications

Visible Emission on Nanostructured CeO2 Thin Films Obtained by Spray Pyrolysis

Visible Emission on Nanostructured CeO2 Thin Films Obtained by Spray Pyrolysis

Nanocrystalline cathode functional layer for SOFC

In-Situ Observation of Co-Ce Coated Metallic Interconnect Oxidation Combined with High-Resolution Post Exposure Analysis

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Product

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Visible Emission on Nanostructured CeO₂ Thin Films Obtained by Spray Pyrolysis

Visible Emission on Nanostructured CeO₂ Thin Films Obtained by Spray Pyrolysis