Nanostructured Gd–CeO2 electrolyte for solid oxide fuel cell by aqueous tape casting

Akbari‐Fakhrabadi, Ali; Mangalaraja, Ramalinga Viswanathan; Sanhueza, Felipe; Ávila, Ricardo E.; Ananthakumar, S.; Chan, Siew Hwa

doi:10.1016/j.jpowsour.2012.07.005

Cited by 35 publications

(27 citation statements)

References 26 publications

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“…Most recently, Biesuz et al [98] studied the flash sintering of Ce0.9Gd0.1O1.95 pellets with silver electrodes, and found flash sintering onset temperatures of 700 o C for 75V/cm and 550 o C for 150V/cm, with current density limited to around 55mA/mm 2 . Given the different conditions used, these findings are in line with those of Jiang et al [96] but somewhat lower temperatures than Akbari-Fakharbadi [42]. However in this case Biesuz et al [98] found that their samples sintered to densities between 98-100% with grain sizes of 300-500nm, giving an electrolyte which is ideal for SOFC applications [98].…”

Section: Materials For Use In Solid Oxide Fuel Cellssupporting

confidence: 76%

“…Scanning electron micrographs show that the samples were not fully dense (though the density is not stated) and had an inhomogenous microstructure, suggesting that the flash sintering conditions used here are not optimised [42]. Most recently, Biesuz et al [98] studied the flash sintering of Ce0.9Gd0.1O1.95 pellets with silver electrodes, and found flash sintering onset temperatures of 700 o C for 75V/cm and 550 o C for 150V/cm, with current density limited to around 55mA/mm 2 .…”

Section: Materials For Use In Solid Oxide Fuel Cellsmentioning

confidence: 97%

“…While occasionally studies have been completed which use alternative electrode materials such as molybdenum wires [32] or copper wire [42], on the whole the choice of electrode material is not justified or varied systematically. Two studies where different electrode materials were used in the same study give some insight.…”

Section: Electrical Contactmentioning

confidence: 99%

“…Building on earlier work [48], Jiang et al [96] showed that under 90V/cm and ~86mA/mm 2 current density, Ce0.9Gd0.1O1.95, Ce0.8Gd0.2O1.9 and C0.8Sm0.2O1. under electric field of 70V/cm, with a current limit of 0.5A (corresponding to a current density limit of approximately 0.4A/mm 2 calculated with the given sample dimensions before binder burnout) [42].…”

Section: Materials For Use In Solid Oxide Fuel Cellsmentioning

confidence: 99%

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Flash sintering of ceramic materials

Dancer¹

2016

Mater. Res. Express

159

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During flash sintering, ceramic materials can sinter to high density in a matter of seconds while subjected to electric field and elevated temperature. This process, which occurs at lower furnace temperatures and in shorter times than both conventional ceramic sintering and field-assisted methods such as spark plasma sintering, has the potential to radically reduce the power consumption required for the densification of ceramic materials. This paper reviews the experimental work on flash sintering methods carried out to date, and compares the properties of the materials obtained to those produced by conventional sintering. The flash sintering process is described for oxides of zirconium, yttrium, aluminium, tin, zinc, and titanium; silicon and boron carbide, zirconium diboride, materials for solid oxide fuel applications, ferroelectric materials, and composite materials. While experimental observations have been made on a wide range of materials, understanding of the underlying mechanisms responsible for the onset and latter stages of flash sintering is still elusive. Elements of the proposed theories to explain the observed behaviour include extensive Joule heating throughout the material causing thermal runaway, arrested by the current limitation in the power supply, and the formation of defect avalanches which rapidly and dramatically increase the sample conductivity.Undoubtedly, the flash sintering process is affected by the electric field strength, furnace temperature and current density limit, but also by microstructural features such as the presence of second phase particles or dopants and the particle size in the starting material. While further experimental work and modelling is still required to attain a full understanding capable of predicting the success of the flash sintering process in different materials, the technique nonetheless holds great potential for exceptional control of the ceramic sintering process.

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Section: Materials For Use In Solid Oxide Fuel Cellssupporting

confidence: 76%

Section: Materials For Use In Solid Oxide Fuel Cellsmentioning

confidence: 97%

Section: Electrical Contactmentioning

confidence: 99%

Section: Materials For Use In Solid Oxide Fuel Cellsmentioning

confidence: 99%

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Flash sintering of ceramic materials

Dancer¹

2016

Mater. Res. Express

159

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“…There is a wide range of applications for pure and doped ceria (CeO 2 ) such as electrolyte and barrier layers for solid oxide fuel cells (SOFCs) [1,2], catalysts for the treatment of automotive exhaust gases, petroleum cracking catalyst and gas sensor [3,4], polishing materials [5], oxygen pumps, ampere metric oxygen monitors [6,7] and optical films [8] because of their remarkable properties such as high oxygen storage capability [9,10] and ionic conductivity [11].…”

Section: Introductionmentioning

confidence: 99%

Effect of rare earth dopants on structural and mechanical properties of nanoceria synthesized by combustion method

Akbari‐Fakhrabadi

Meruane

Jamshidijam

et al. 2016

Materials Science and Engineering: A

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This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting galley proof before it is published in its final citable form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. E-mail: aliakbarif@ing.uchile.cl Abstract Structural characteristics of combustion synthesized, calcined and densified pure and doped nanoceria with tri-valent cations of Er, Y, Gd, Sm and Nd were analyzed by X-ray diffraction (XRD) and high resolution transmission electron microscopy (HRTEM). The results showed that the as-synthesized and calcined nanopowders were mesoporous and calculated lattice parameters were close to theoretical ion-packing model. The effect of dopants on elastic modulus, microhardness and fracture toughness of sintered pure and doped ceria were investigated. It was observed that tri-valent cation dopants increased the hardness of the ceria, whereas the fracture toughness and elastic modulus were decreased.

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Planar Solid Oxide Fuel Cell Fabricated by Aqueous Reverse Sequential Tape‐Casting of the Anode, Electrolyte, and Barrier Layer

et al. 2023

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A low‐cost manufacturing procedure has been developed for the fabrication of planar anode‐supported solid oxide fuel cell including only two thermal treatments. This method is also environmental friendly because slurries are water based and use nontoxic additives. Slurries are formulated by optimizing the powder quantity, by minimizing the organic compounds while controlling their stabilities and their rheological properties. Flexible multilayer green tapes have been produced by using the reverse sequential tape‐casting method. After a cosintering thermal treatment under loads, planar anodic half‐cells have been produced allowing the deposition of a La2NiO4+δ cathode by screen printing. After the final consolidation thermal treatment, the cell presents a 30 μm‐thick porous cathode, a 530 μm‐thick NiO‐YSZ porous anode, and a 80 μm‐thick dense electrolyte with a gradient of composition: 10GDC on the cathode side to prevent the apparition of the La2Zr2O7 insulating phase and 8YSZ on the anode side to avoid the reduction of 10GDC with the fuel gas. Power densities present promising performances (319 mW cm−2 at 830 °C) given that electrolyte thickness and electrochemical system measurement may be improved.

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Nanostructured Gd–CeO2 electrolyte for solid oxide fuel cell by aqueous tape casting

Cited by 35 publications

References 26 publications

Flash sintering of ceramic materials

Flash sintering of ceramic materials

Effect of rare earth dopants on structural and mechanical properties of nanoceria synthesized by combustion method

Planar Solid Oxide Fuel Cell Fabricated by Aqueous Reverse Sequential Tape‐Casting of the Anode, Electrolyte, and Barrier Layer

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