Introduction of In or Ga as second dopant to BaZr0.9Y0.1O3−δ to achieve better sinterability

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

doi:10.1016/j.ssi.2008.02.047

Cited by 69 publications

(31 citation statements)

References 12 publications

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“…Yttrium-doped barium zirconate is known to have the lowest protonic resistance of grain interior among trivalent cation-doped barium zirconate and this property attracts many researchers. [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22] In the previous works, we investigated a sintering mechanism of 15% yttrium-doped barium zirconate (BaZr 0.85 Y 0.15 O 3-d ) at 1600°C based on the idea of twophase separation of yttrium poor barium zirconate and yttrium rich barium zirconate phase in the sample by conventional solid state reaction. [19,20] A phase separation at 1600°C was reported by Kojima et al [23] However, the points we discussed are that there is no phase separation in equilibrium at 1600°C, but traces of the phase separation at synthesizing temperature, 1300°C, might remain even at 1600°C.…”

Section: Introductionmentioning

confidence: 99%

To Journal of Phase Equilibria and Diffusion Phase Relationship of the BaO-ZrO2-YO1.5 System at 1500 and 1600 °C

Imashuku

Uda

Nosé

et al. 2010

J. Phase Equilib. Diffus.

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Phase relationship of a BaO-ZrO 2 -YO 1.5 system at 1500 and 1600°C was examined in order to determine whether a phase separation at the composition of 15% yttrium-doped barium zirconate exists. According to a pseudoternary phase diagram of the BaO-ZrO 2 -YO 1.5 system established by this work, the solubility of yttria into cubic barium zirconate at 1600°C is 0.25 in a mole fraction of yttria ðX YO 1:5 Þ. Thus, we confirmed that there is no phase separation at the composition of 15% yttrium-doped barium zirconate at 1600°C. On the other hand, at 1500°C, there might be a phase separation at the composition of 15% yttrium-doped barium zirconate into yttrium-doped barium zirconate where quite small amount of yttrium is doped and a new phase whose composition is close to reported BZ(II) phase.

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Section: Introductionmentioning

confidence: 99%

To Journal of Phase Equilibria and Diffusion Phase Relationship of the BaO-ZrO2-YO1.5 System at 1500 and 1600 °C

Imashuku

Uda

Nosé

et al. 2010

J. Phase Equilib. Diffus.

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“…Recently, the rare earth oxides were used as a second dopant for barium cerates and zirconates to improve their sinterability and electrical conductivity [21][22][23][24][25][26][27][28]. It was reported that the indium as a dopant is favorable to the stability and sinterability of proton-conducting perovskites, such as an indium dopant enhances the stability and sinterability of BaCeO 3 in CO 2 atmosphere [24,25], and the indium as a second dopant can improve the sinterability of BaZr 0.9 Y 0.1 O 3 À δ [26].…”

Section: Introductionmentioning

confidence: 99%

“…It was reported that the indium as a dopant is favorable to the stability and sinterability of proton-conducting perovskites, such as an indium dopant enhances the stability and sinterability of BaCeO 3 in CO 2 atmosphere [24,25], and the indium as a second dopant can improve the sinterability of BaZr 0.9 Y 0.1 O 3 À δ [26]. Giannici et al [27] reported that the high indium dopant level leads to high proton concentration and can compensate the lower proton mobility compared to the traditional Y-doped BaCeO 3 .…”

Section: Introductionmentioning

confidence: 99%

Effect of indium content on the properties of BaSn0.5Y0.5−xInxO2.75 proton conductor

Wang

Liu

et al. 2015

Ceramics International

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“…Significantly improved sinterability was achieved by incorporating indium or gallium as a second dopant in BZY. 26 Recently, Fabbri et al demonstrated that with Pr-doping an almost fully dense microstructure can be achieved for BZY at appropriate temperatures. 27 Despite the improvement in the sinteractivity through the application of sintering aids in BZY, the fabrication of corresponding cells with desired power performance through conventional ceramic processes still remains a major challenge.…”

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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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Introduction of In or Ga as second dopant to BaZr0.9Y0.1O3−δ to achieve better sinterability

Cited by 69 publications

References 12 publications

To Journal of Phase Equilibria and Diffusion Phase Relationship of the BaO-ZrO2-YO1.5 System at 1500 and 1600 °C

To Journal of Phase Equilibria and Diffusion Phase Relationship of the BaO-ZrO2-YO1.5 System at 1500 and 1600 °C

Effect of indium content on the properties of BaSn0.5Y0.5−xInxO2.75 proton conductor

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

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Introduction of In or Ga as second dopant to BaZr0.9Y0.1O3−δ to achieve better sinterability

Cited by 69 publications

References 12 publications

To Journal of Phase Equilibria and Diffusion Phase Relationship of the BaO-ZrO2-YO1.5 System at 1500 and 1600 °C

To Journal of Phase Equilibria and Diffusion Phase Relationship of the BaO-ZrO2-YO1.5 System at 1500 and 1600 °C

Effect of indium content on the properties of BaSn0.5Y0.5−xInxO2.75 proton conductor

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

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