A composite sol–gel process to prepare a YSZ electrolyte for Solid Oxide Fuel Cells

Courtin, Émilie; Boy, Philippe; Piquero, T.; Vulliet, Julien; Poirot, Nathalie; Laberty-Robert, Christel

doi:10.1016/j.jpowsour.2012.01.109

Cited by 51 publications

(27 citation statements)

References 22 publications

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“…The reason of electrical conductivity increase can be attributed to dispersion effect; in other words particle agglomerations of non-treated YSZ8 N cause a decrease in electrical conductivity. The electrical conductivity obtained in this study is greater than that reported by Courtin [22] (0.03 S cm À 1 at 800 1C) using commercial YSZ powder and Triton X as dispersant [22].…”

Section: Suspension Stabilitycontrasting

confidence: 70%

Dispersant effects on YSZ electrolyte characteristics for solid oxide fuel cells

Curi

Ferraz

Furtado³

et al. 2015

Ceramics International

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Section: Suspension Stabilitycontrasting

confidence: 70%

Dispersant effects on YSZ electrolyte characteristics for solid oxide fuel cells

Curi

Ferraz

Furtado³

et al. 2015

Ceramics International

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“…However, shrinkage and densification in pressed LSF pellets typically occurs at much lower temperatures, as low as 1273 K, 19 while temperatures in excess of 1623 K are typically needed to sinter YSZ. 20 Therefore, the poor microstructure at the YSZ-LSF91 interface is likely due to this difference in the sintering rates for the LSF91 and YSZ. This conclusion is also supported by the SEM images which show that the pure LSF91 scaffold (Figure 5c) appears to have much larger grain sizes compared to what is observed in YSZ and YSZ-LSF91 composite scaffold.…”

Section: Resultsmentioning

confidence: 99%

An Investigation of LSF-YSZ Conductive Scaffolds for Infiltrated SOFC Cathodes

Cheng

Wilson

et al. 2017

J. Electrochem. Soc.

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Porous composites of Sr-doped LaFeO 3 (LSF) and yttria-stabilized zirconia (YSZ) were investigated as conductive scaffolds for infiltrated SOFC cathodes with the goal of producing scaffolds for which only a few perovskite infiltration steps are required to achieve sufficient conductivity. While no new phases form when LSF-YSZ composites are calcined to 1623 K, shifts in the lattice parameters indicate Zr can enter the perovskite phase. Measurements on dense, LSF-YSZ composites show that the level of Zr doping depends on the Sr:La ratio. Because conductivity of undoped LSF increases with Sr content while both the ionic and electronic conductivities of Zr-doped LSF decrease with the level of Zr in the perovskite phase, there is an optimum initial Sr content corresponding to La 0.9 Sr 0.1 FeO 3 (LSF91). Although scaffolds made with 100% LSF had a higher conductivity than scaffolds made with 50:50 LSF-YSZ mixtures, the 50:50 mixture provides the optimal interfacial structure with the electrolyte and sufficient conductivity, providing the best cathode performance upon infiltration of La 0.6 Sr 0. 1 First, the NiO-YSZ composite that will become the anode is co-fired together with the YSZ electrolyte to produce a dense electrolyte. Next, a doped-ceria layer is screen printed onto the cathode side of the dense electrolyte and fired to produce a doped-ceria film that will act as a barrier layer to prevent reaction of the LSCF with the YSZ. Finally, LSCF is screen printed onto the doped-ceria film and fired to a temperature sufficient to give the LSCF structural integrity and good adhesion to the electrolyte. Obviously, there would be significant advantages to reducing the number of fabrication and calcination steps.An alternative method for preparing high-performance LSCF cathodes involves preparing a porous YSZ scaffold on the cathode side of the electrolyte, followed by infiltration of LSCF nanoparticles or precursor salts.2 The NiO-YSZ anode, the YSZ electrolyte, and the YSZ scaffold layers can all be co-fired, and the doped-ceria barrier layer may not be needed.3 However, the infiltration method is not widely used because many infiltration steps are typically required to provide sufficient cathode conductivity.Recently, it was suggested that the number of infiltration steps could be greatly reduced if the porous scaffold was itself electronically conductive. 4 Infiltration is still required to add LSCF into the scaffold to carry out the oxygen-exchange reactions but the amounts required for the catalytic reaction can be much smaller. To implement this approach, it is necessary to find a conductive oxide that will not react with YSZ at the temperatures required to produce a dense electrolyte. Because Sr-doped LaFeO 3 (LSF) has been shown to be relatively unreactive with YSZ, 5-7 our group focused on preparing LSF-YSZ scaffolds for this application.4 Co-firing LSF and YSZ did not lead to new phases but a shift in the lattice parameter for the perovskite phase suggested that some Zr was entering the perovskite lattice. ...

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“…Still, there is limitation for obtaining crack-free film thicker than 10 μm due to the constraining effect of the substrate. Hence, combined colloidal CSD method was introduced [32,63,68,69]. This method involves addition of pre-synthesized nano-powder to CSD solution.…”

Section: Combined Colloidal Csd Methodsmentioning

confidence: 99%

“…The success of this process was established with the achievement of 1.0 V OCV at 650°C [31]. Numerous significant progresses across the globe are discussed in various articles [3,[32][33][34][35][36][37][38][39][40][41][42][43][44][45][46].…”

Section: Discovery and Progress Of Csdmentioning

confidence: 99%

Chemical Solution Deposition Technique of Thin-Film Ceramic Electrolytes for Solid Oxide Fuel Cells

Biswas¹,

Su²

2017

Modern Technologies for Creating the Thin-Film Systems and Coatings

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Chemical solution deposition (CSD) technique is recently gaining momentum for the fabrication of electrolyte materials for solid oxide fuel cells (SOFCs) due to its costeffectiveness, high yield, and simplicity of the process requirements. The advanced vacuum deposition techniques such as sputtering, atomic layer deposition (ALD), pulsed laser deposition (PLD), metallo-organic chemical vapor deposition (MOCVD) are lacking in scalability and cost-effectiveness. CSD technique includes a variety of approaches such as sol-gel process, chelate process, and metallo-organic decomposition. The present chapter discusses briefly about the evolution of CSD method and its subsequent entry to the field of SOFCs, various solution methods associated with different chemical compositions, film deposition techniques, chemical reactions, heat treatment strategies, nucleation and growth kinetics, associated defects, etc. Examples are cited to bring out the history dating back to the discovery of amorphous zirconia film through the successful fabrication of the crystalline fluorite-type films such as yttria-stabilized zirconia (YSZ), scandia-doped ceria (SDC), and crystalline perovskitetype films such as yttria-doped barium zirconate (BZY) and yttria-doped barium cerate (BCY), to name a few.

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A composite sol–gel process to prepare a YSZ electrolyte for Solid Oxide Fuel Cells

Cited by 51 publications

References 22 publications

Dispersant effects on YSZ electrolyte characteristics for solid oxide fuel cells

Dispersant effects on YSZ electrolyte characteristics for solid oxide fuel cells

An Investigation of LSF-YSZ Conductive Scaffolds for Infiltrated SOFC Cathodes

Chemical Solution Deposition Technique of Thin-Film Ceramic Electrolytes for Solid Oxide Fuel Cells

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