Preparation, sintering, and water incorporation of proton conducting Ba0.99Zr0.8Y0.2O3??: comparison between three different synthesis techniques

Magrez, Arnaud

doi:10.1016/j.ssi.2004.03.045

Cited by 103 publications

(73 citation statements)

References 10 publications

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“…The data reveal quite clearly that even after just a few hours of exposure to 1600°C, the uncovered pellets show a decrease in perovskite cell constant and display the presence of an impurity phase with a high intensity peak at 29.2°2. This phase, also observed by Magrez 22 corresponds to a "yttria-like" material 23 with space group Ia3 and lattice constant approximately 10.59 Å. It is to be emphasized that these precipitates occur throughout the bulk of the pellets; the highly disintegrated surface layer (50-100 m) was removed by polishing prior to the collection of the diffraction data.…”

Section: Resultsmentioning

confidence: 61%

Processing of yttrium-doped barium zirconate for high proton conductivity

2007

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The factors governing the transport properties of yttrium-doped barium zirconate (BYZ) have been explored, with the aim of attaining reproducible proton conductivity in well-densified samples. It was found that a small initial particle size (50-100 nm) and high-temperature sintering (1600°C) in the presence of excess barium were essential. By this procedure, BaZr 0.8 Y 0.2 O 3−␦ with 93% to 99% theoretical density and total (bulk plus grain boundary) conductivity of 7.9 × 10 −3 S/cm at 600°C [as measured by alternating current (ac) impedance spectroscopy under humidified nitrogen] could be reliably prepared. Samples sintered in the absence of excess barium displayed yttria-like precipitates and a bulk conductivity that was reduced by more than 2 orders of magnitude.

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Section: Resultsmentioning

confidence: 61%

Processing of yttrium-doped barium zirconate for high proton conductivity

2007

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“…In combustion method, the lattice constants for the BSCZGY phase in all compositions are found to be higher than the lattice parameter of stoichiometric as-prepared BSCZGY (4.298 Å) ( (Shannon, 1976). (Narendar et al, 2013;Magrez & Schober, 2004;Yamazaki, Hernandez-Schanchez, & Haile, 2010). Also, the presence of BaY 2 NiO 5 impurity phase was found during synthesis of Ni-BaZr 1-x Y x O 3-δ composite anodes prepared through nitrate-based combustion method, and when Ni was used as a sintering aid for doped-BaZrO 3 Babilo & Haile, 2005;Magrez & Schober, 2004;Tong, Clark, Bernau, Sanders, & O'Hayre, 2010;.…”

Section: Materials Preparation and Experimental Proceduresmentioning

confidence: 87%

“…(Narendar et al, 2013;Magrez & Schober, 2004;Yamazaki, Hernandez-Schanchez, & Haile, 2010). Also, the presence of BaY 2 NiO 5 impurity phase was found during synthesis of Ni-BaZr 1-x Y x O 3-δ composite anodes prepared through nitrate-based combustion method, and when Ni was used as a sintering aid for doped-BaZrO 3 Babilo & Haile, 2005;Magrez & Schober, 2004;Tong, Clark, Bernau, Sanders, & O'Hayre, 2010;. Literature studies have suggested that the impurity phase BaY 2 NiO 5 form at temperatures above 900 ºC, and remains even at high temperatures of 1500 ºC .…”

Section: Materials Preparation and Experimental Proceduresmentioning

confidence: 98%

Ni-Ba0.5Sr0.5Ce0.6Zr0.2Gd0.1Y0.1O3-Delta Anode Composites for Proton Conducting Solid Oxide Fuel Cells (H-SOFCs)

Singh¹,

Baral²,

Thangadurai³

2016

JMSR

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In this paper, we report the electrochemical properties of Ni-Ba 0.5 Sr 0.5 Ce 0.6 Zr 0.2 Gd 0.1 Y 0.1 O 3-δ (BSCZGY) anode composites in 3% H 2 O-H 2 for proton conducting solid oxide fuel cells (H-SOFCs). Ni-BSCZGY composites with volume ratio of 30:70, 40:60, and 50:50 were synthesised through mechanical mixing and combustion methods. In combustion method, auto-ignition step led to brown coloured ash, which was calcined at 1000

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“…This means that BZY proton conductivity is hindered by blocking grain boundaries; the poor sinterability of this compound leads to the presence of a large amount of grain boundaries, because the BZY grains growth with difficulties. This problem has been recently tackled in different ways: using wet chemical methods for BZY synthesis at low temperatures [16,29], or using sintering additives to reduce the sintering temperature [23,27]. Nonetheless, the improvement of total conductivity was limited.…”

Section: Introductionmentioning

confidence: 99%

Design of BaZr_0.8Y_0.2O_3–δ Protonic Conductor to Improve the Electrochemical Performance in Intermediate Temperature Solid Oxide Fuel Cells (IT‐SOFCs)

et al. 2008

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BaZr0.8Y0.2O3–δ, (BZY), a protonic conductor candidate as an electrolyte for intermediate temperature (500–700 °C) solid oxide fuel cells (IT‐SOFCs), was prepared using a sol–gel technique to control stoichiometry and microstructural properties. Several synthetic parameters were investigated: the metal cation precursors were dissolved in two solvents (water and ethylene glycol), and different molar ratios of citric acid with respect to the total metal content were used. A single phase was obtained at a temperature as low as 1,100 °C. The powders were sintered between 1,450 and 1,600 °C. The phase composition of the resulting specimens was investigated using X‐ray diffraction (XRD) analysis. Microstructural characterisation was performed using field emission scanning electron microscopy (FE‐SEM). Chemical stability of the BZY oxide was evaluated upon exposure to CO2 for 3 h at 900 °C, and BZY showed no degradation in the testing conditions. Fuel cell polarisation curves on symmetric Pt/BZY/Pt cells of different thicknesses were measured at 500–700 °C. Improvements in the electrochemical performance were obtained using alternative materials for electrodes, such as NiO‐BZY cermet and LSCF (La0.8Sr0.2Co0.8Fe0.2O3), and reducing the thickness of the BZY electrolyte, reaching a maximum value of power density of 7.0 mW cm–2 at 700 °C.

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Preparation, sintering, and water incorporation of proton conducting Ba0.99Zr0.8Y0.2O3??: comparison between three different synthesis techniques

Cited by 103 publications

References 10 publications

Processing of yttrium-doped barium zirconate for high proton conductivity

Processing of yttrium-doped barium zirconate for high proton conductivity

Ni-Ba0.5Sr0.5Ce0.6Zr0.2Gd0.1Y0.1O3-Delta Anode Composites for Proton Conducting Solid Oxide Fuel Cells (H-SOFCs)

Design of BaZr_0.8Y_0.2O_3–δ Protonic Conductor to Improve the Electrochemical Performance in Intermediate Temperature Solid Oxide Fuel Cells (IT‐SOFCs)

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Preparation, sintering, and water incorporation of proton conducting Ba0.99Zr0.8Y0.2O3??: comparison between three different synthesis techniques

Cited by 103 publications

References 10 publications

Processing of yttrium-doped barium zirconate for high proton conductivity

Processing of yttrium-doped barium zirconate for high proton conductivity

Ni-Ba0.5Sr0.5Ce0.6Zr0.2Gd0.1Y0.1O3-Delta Anode Composites for Proton Conducting Solid Oxide Fuel Cells (H-SOFCs)

Design of BaZr0.8Y0.2O3–δ Protonic Conductor to Improve the Electrochemical Performance in Intermediate Temperature Solid Oxide Fuel Cells (IT‐SOFCs)

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Design of BaZr_0.8Y_0.2O_3–δ Protonic Conductor to Improve the Electrochemical Performance in Intermediate Temperature Solid Oxide Fuel Cells (IT‐SOFCs)