Electrophoretic deposition on non-conducting substrates: The case of YSZ film on NiO–YSZ composite substrates for solid oxide fuel cell application

Besra, Laxmidhar; Compson, Charles; Liu, Meilin

doi:10.1016/j.jpowsour.2007.04.061

Cited by 84 publications

(60 citation statements)

References 20 publications

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“…In the case of anodesupported SOFCs using YSZ as an electrolyte, usually the substrate used for deposition is NiO-YSZ, with a too low conductivity that needs for EPD the deposition on the substrate of a platinum [18] or of a fugitive graphite layer [19]. Recently, it was found that tailoring the porosity of the NiO-YSZ substrate allows the solvent to penetrate the pores and establish a conductive path that allowed EPD [20]. For the preparation of electrolyte films in anode-supported SOFCs, a sintering step is needed to consolidate and densify the particles deposited by EPD, which are well packed using the proper deposition parameters with high green density.…”

Section: Introductionmentioning

confidence: 99%

Electrophoretic Deposition of Dense Sr‐ and Mg‐Doped LaGaO₃ Electrolyte Films on Porous La‐Doped Ceria for Intermediate Temperature Solid Oxide Fuel Cells

2008

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The application of the electrophoretic deposition (EPD) technique to the preparation of dense La0.8Sr0.2Ga0.8Mg0.2O2.8 (LSGM) electrolyte films for intermediate temperature solid oxide fuel cells (IT‐SOFCs) was investigated. Suspensions of LSGM were prepared in acetone + I2 + H2O dispersion media. The effects of water and iodine content, of the applied voltage, and of powder loading on the EPD rate were systematically studied using metallic substrates (Pt and stainless steel). This allowed to identify the suitable set of EPD process parameters that were used to deposit LSGM films on tape‐cast composite electrodes, composed of lanthanum‐doped ceria (La0.4Ce0.6O2 –x, LDC), polyvinylidene difluoride (PVDF) and carbon powders. After EPD, dense and crack‐free 15 μm thick LSGM films were obtained on porous LDC by co‐firing in air at 1,490 °C. Line profile analyses performed by energy dispersive X‐ray spectroscopy (EDS) did not reveal any interdiffusion of ions across the LSGM/LDC interface. The chemical and structural compatibility of LSGM with LDC was also checked by heat treating a mixture of the two powders (1:1 weight ratio) using the same thermal cycle as that of the LDC/LSGM bi‐layer co‐firing at 1,490 °C. EPD has thus proven to be a viable way for manufacturing anode‐supported LSGM electrolyte films.

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Section: Introductionmentioning

confidence: 99%

Electrophoretic Deposition of Dense Sr‐ and Mg‐Doped LaGaO₃ Electrolyte Films on Porous La‐Doped Ceria for Intermediate Temperature Solid Oxide Fuel Cells

2008

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“…While electrolyte supported cell (ESC) technology has an established open circuit voltage (OCV) greater than 1.1 V, anode supported cell (ASC) technology often yield lower OCVs [6][7][8]. This unfortunate phenomenon is often attributed to defects within the YSZ electrolyte, and not leak current as with some ceria-based electrolytes [9].…”

Section: Introductionmentioning

confidence: 99%

Thin film YSZ coatings on functionally graded freeze cast NiO/YSZ SOFC anode supports

et al. 2008

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Intermediate temperature (600-800°C) solid oxide fuel cell (SOFC) technology is often limited by inadequate gas transport in electrodes, and high ion transport resistance electrolytes. In this study, large area filtered arc deposition (LAFAD) and hybrid filtered arc-assisted e-beam physical vapor deposition (FA-EBPVD) technologies, in combination with freeze-tape-casting, were used to fabricate SOFC anode/electrolyte bi-layers with functionally graded porous anode microstructures and thin film electrolytes favorable for both gas transport and low resistance. Traditionally-processed NiO/YSZ in addition to freeze-tape-cast NiO/YSZ anode substrates were fabricated and subsequently coated with thin film (\1-20 lm) YSZ via LAFAD and FA-EBPVD. LAFAD was found to be effective in applying thin (*1 lm) dense YSZ films on porous substrates at *400°C. FA-EBPVD produced relatively thick (*10-20 lm) dense YSZ coatings on porous substrates, with columnar morphology and nano-metrical grain size. A *10 lm FA-EBPVD YSZ coating was observed to bridge NiO/YSZ surface pores of *10 lm, which typically requires pre-filling prior to conventional thin film coating processes. Coated substrates exhibited negligible curvature, yielding flat anode/electrode bi-layers up to 2.5 cm in diameter. These results are presented with conderations for future SOFC development discussed.

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“…In this contribution, processing of a dense, continuous environmental barrier overlay, applied by electrophoretic deposition (EPD) is introduced. EPD is a versatile and ''scale-up-ready'' manufacturing technique that can produce crack-free overlay coatings of controlled thickness and porosity, uniform pore-distribution with improved microstructural homogeneity and superior adhesion (Ref[26][27][28][29].…”

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confidence: 99%

Degradation of Thermal Barrier Coatings by Fuel Impurities and CMAS: Thermochemical Interactions and Mitigation Approaches

et al. 2009

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Degradation of free-standing yttria-stabilized zirconia (YSZ) and CoNiCrAlY coatings (300 lm) due to V 2 O 5 and a laboratory-synthesized CMAS was investigated at temperatures up to 1400°C. Reactions, phase transformations, and microstructural development in coatings were examined by using x-ray diffraction, scanning electron microscopy, and transmission electron microscopy. The molten deposits destabilized the YSZ and reacted with the thermally grown oxide with various phase transformations and reaction product formation. A dense, continuous environmental barrier overlay, based on oxides, applied by electrophoretic deposition was effective in mitigating the molten deposit attack. Enriching CMAS composition with Al promoted the crystallization of anorthite platelets and MgAl 2 O 4 spinel, and mitigated CMAS ingression. EPD MgO overlay was also effective in protection against V 2 O 5 melt by formation of magnesium vanadates. EPD alumina overlay deposited on thermal barrier coatings with APS 8YSZ and bond-coated IN939 superalloy retained its adhesion and structural integrity after prolonged furnace thermal cycle test at 1100°C.

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Electrophoretic deposition on non-conducting substrates: The case of YSZ film on NiO–YSZ composite substrates for solid oxide fuel cell application

Cited by 84 publications

References 20 publications

Electrophoretic Deposition of Dense Sr‐ and Mg‐Doped LaGaO₃ Electrolyte Films on Porous La‐Doped Ceria for Intermediate Temperature Solid Oxide Fuel Cells

Electrophoretic Deposition of Dense Sr‐ and Mg‐Doped LaGaO₃ Electrolyte Films on Porous La‐Doped Ceria for Intermediate Temperature Solid Oxide Fuel Cells

Thin film YSZ coatings on functionally graded freeze cast NiO/YSZ SOFC anode supports

Degradation of Thermal Barrier Coatings by Fuel Impurities and CMAS: Thermochemical Interactions and Mitigation Approaches

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Electrophoretic deposition on non-conducting substrates: The case of YSZ film on NiO–YSZ composite substrates for solid oxide fuel cell application

Cited by 84 publications

References 20 publications

Electrophoretic Deposition of Dense Sr‐ and Mg‐Doped LaGaO3 Electrolyte Films on Porous La‐Doped Ceria for Intermediate Temperature Solid Oxide Fuel Cells

Electrophoretic Deposition of Dense Sr‐ and Mg‐Doped LaGaO3 Electrolyte Films on Porous La‐Doped Ceria for Intermediate Temperature Solid Oxide Fuel Cells

Thin film YSZ coatings on functionally graded freeze cast NiO/YSZ SOFC anode supports

Degradation of Thermal Barrier Coatings by Fuel Impurities and CMAS: Thermochemical Interactions and Mitigation Approaches

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Electrophoretic Deposition of Dense Sr‐ and Mg‐Doped LaGaO₃ Electrolyte Films on Porous La‐Doped Ceria for Intermediate Temperature Solid Oxide Fuel Cells

Electrophoretic Deposition of Dense Sr‐ and Mg‐Doped LaGaO₃ Electrolyte Films on Porous La‐Doped Ceria for Intermediate Temperature Solid Oxide Fuel Cells