Proton conduction and chemical stability of (La0.5Sr0.5)(Mg0.5+yNb0.5−y)O3−δ

Kawasaki, Yuya; Okada, Sachio; Ito, Naoki; Matsumoto, Hiroshige; Ishihara, Tatsumi

doi:10.1016/j.materresbull.2008.04.018

Cited by 7 publications

(3 citation statements)

References 21 publications

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“…Because of this, competitive materials should be developed. For example, proton conductors, which are much more stable in CO 2 , are acceptor-doped lanthanum ortho-niobates [5][6][7][8][9][10] Also magnesium-doped ortho-niobates give promising results by reaching the conductivity level of 2.2 × 10 −5 S/cm [11]. Optimization of the synthesis method resulting in crystallographically-oriented ceramics is one way of improving their electrical properties.…”

Section: Introductionmentioning

confidence: 99%

Nano‐ and microcrystals of doped niobates

Mielewczyk‐Gryń

Gdula

Lendze

et al. 2010

Cryst. Res. Technol.

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A Fergusonite-type phase of acceptor-doped lanthanum ortho-niobate La 1-x A x NbO 4 (A = Ca, Mg or Sr) has been synthesised by molten salt synthesis route. The high temperature behaviour and microstructure of samples doped by magnesium, calcium and strontium have been studied. The high temperature X-ray diffraction measurements in the temperature range from room temperature to 700 °C has been carried out. The scanning electron microscopy has been used to determine the samples microstructure and to compare the grain size of each material. The differences in the phase transition temperature and morphology of the samples, depending on the dopant, have been discussed.

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Section: Introductionmentioning

confidence: 99%

Nano‐ and microcrystals of doped niobates

Mielewczyk‐Gryń

Gdula

Lendze

et al. 2010

Cryst. Res. Technol.

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“…To date, although a wide range of proton conductor materials has been reported, 15,16 the majority of the researches on HTPC electrolytes still focus on BaCeO 3 and BaZrO 3 related materials.…”

Section: -14mentioning

confidence: 99%

“…[11][12][13][14] One of the major challenges for practical deployment has been the selection of an appropriate electrolyte material with adequate ionic conductivity at low temperatures, good processability, and chemical stability for long-term operation in working conditions. To date, although a wide range of proton conductor materials has been reported, 15,16 the majority of the researches on HTPC electrolytes still focus on BaCeO 3 and BaZrO 3 related materials. 17,18 Y-doped BaCeO 3 (BCY) exhibits good sinterability with appropriate protonic conductivity, but practical application is hindered by its reactivity with acidic gases such as CO 2 that leads to decomposition into BaCO 3 and CeO 2 .…”

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confidence: 99%

Y and Ni Co-Doped BaZrO₃as a Proton-Conducting Solid Oxide Fuel Cell Electrolyte Exhibiting Superior Power Performance

Shafi

Boulfrad

et al. 2015

J. Electrochem. Soc.

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The fabrication of anode supported single cells based on BaZr 0.8 Y 0.2 O 3-δ (BZY20) electrolyte is challenging due to its poor sinteractive nature. The acceleration of shrinkage behavior, improved sinterability and larger grain size were achieved by the partial substitution of Zr with Ni in the BZY perovskite. Phase pure Ni-doped BZY powders of nominal compositions BaZr 0.8-x Y 0.2 Ni x O 3-δ were synthesized up to x = 0.04 using a wet chemical combustion synthesis route. BaZr 0.76 Y 0.2 Ni 0.04 O 3-δ (BZYNi04) exhibited adequate total conductivity and the open circuit voltage (OCV) values measured on the BZYNi04 pellet suggested lack of significant electronic contribution. The improved sinterability of BZYNi04 assisted the ease in film fabrication and this coupled with the application of an anode functional layer and a suitable cathode, PrBaCo 2 O 5+δ (PBCO), resulted in a superior fuel cell power performance. With humidified hydrogen and static air as the fuel and oxidant, respectively, a peak power density value of 428 and 240 mW cm −2 was obtained at 700 and 600 • C, respectively. The increasing worldwide energy demand and the threatening environmental pollution from conventional fossil fuel combustion call for the thrive of sustainable alternative energy supply. In the past decade, there has been a growing interest toward proton conducting ceramics owing to their high proton conductivity with low activation energies at intermediate temperatures.1 These ceramic materials, termed as high temperature proton conductors (HTPCs), exhibit proton conductivity under hydrogen and/or steam atmospheres 2-6 and find applications as electrolyte membranes for proton conducting solid oxide fuel cells 7,8 and steam electrolyzers, 9,10 as well as hydrogen separation membranes. 11-14One of the major challenges for practical deployment has been the selection of an appropriate electrolyte material with adequate ionic conductivity at low temperatures, good processability, and chemical stability for long-term operation in working conditions. To date, although a wide range of proton conductor materials has been reported, 15,16 the majority of the researches on HTPC electrolytes still focus on BaCeO 3 and BaZrO 3 related materials.17,18 Y-doped BaCeO 3 (BCY) exhibits good sinterability with appropriate protonic conductivity, but practical application is hindered by its reactivity with acidic gases such as CO 2 that leads to decomposition into BaCO 3 and CeO 2 . In contrast, Y-doped BaZrO 3 (BZY) is chemically stable at fuel cell working conditions, but BZY poor sinterability results in large volumes of poorly conducting grain boundaries in ceramic bodies that end up in significantly reducing the total proton conductivity. Nonetheless, it has been reported that grain boundary free BZY thin films exhibit superior bulk proton conductivity. 19The fabrication of BZY-based cells with high ionic conductivity and dense microstructure is a major challenge. The refractory nature of BaZrO 3 hinders its application in fuel cells or other rel...

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Electrical properties and water incorporation in A-site deficient perovskite La1−Ba Nb3O9−0.5

Анимица

Iakovleva

Belova

2016

Journal of Solid State Chemistry

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Proton conduction and chemical stability of (La0.5Sr0.5)(Mg0.5+yNb0.5−y)O3−δ

Cited by 7 publications

References 21 publications

Nano‐ and microcrystals of doped niobates

Nano‐ and microcrystals of doped niobates

Y and Ni Co-Doped BaZrO₃as a Proton-Conducting Solid Oxide Fuel Cell Electrolyte Exhibiting Superior Power Performance

Electrical properties and water incorporation in A-site deficient perovskite La1−Ba Nb3O9−0.5

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Proton conduction and chemical stability of (La0.5Sr0.5)(Mg0.5+yNb0.5−y)O3−δ

Cited by 7 publications

References 21 publications

Nano‐ and microcrystals of doped niobates

Nano‐ and microcrystals of doped niobates

Y and Ni Co-Doped BaZrO3as a Proton-Conducting Solid Oxide Fuel Cell Electrolyte Exhibiting Superior Power Performance

Electrical properties and water incorporation in A-site deficient perovskite La1−Ba Nb3O9−0.5

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Y and Ni Co-Doped BaZrO₃as a Proton-Conducting Solid Oxide Fuel Cell Electrolyte Exhibiting Superior Power Performance