Oxide Ion Conductivity in La(Sr)Ga(Fe,Mg)O3 and Its Application for Solid Oxide Fuel Cells.

ChemInform ◽  
2006 ◽  
Vol 37 (20) ◽  
Author(s):  
Tatsumi Ishihara ◽  
Masaki Ando ◽  
Makiko Enoki ◽  
Yusaku Takita
Keyword(s):  
Fuel Cells ◽  
Solid Oxide Fuel Cells ◽  
Solid Oxide ◽  
Ion Conductivity ◽  
Oxide Fuel ◽  
Oxide Ion Conductivity ◽  
Oxide Ion

Oxide ion conductivity in La(Sr)Ga(Fe,Mg)O3 and its application for solid oxide fuel cells

2006 ◽  
Vol 408-412 ◽  
pp. 507-511 ◽  
Author(s):  
Tatsumi Ishihara ◽  
Masaki Ando ◽  
Makiko Enoki ◽  
Yusaku Takita
Keyword(s):  
Fuel Cells ◽  
Solid Oxide Fuel Cells ◽  
Solid Oxide ◽  
Ion Conductivity ◽  
Oxide Fuel ◽  
Oxide Ion Conductivity ◽  
Oxide Ion

scholarly journals Influence of Isovalent ‘W’ Substitutions on the Structure and Electrical Properties of La2Mo2O9 Electrolyte for Intermediate-Temperature Solid Oxide Fuel Cells

Ceramics ◽  
2021 ◽  
Vol 4 (3) ◽  
pp. 502-515
Author(s):  
Tanmoy Paul ◽  
Yoed Tsur
Keyword(s):  
Fuel Cells ◽  
High Temperature ◽  
Solid Oxide Fuel Cells ◽  
Solid Oxide ◽  
Cubic Phase ◽  
Oxide Fuel ◽  
X Ray Diffraction ◽  
X Ray ◽  
Oxide Ion Conductivity ◽  
Oxide Ion

Lanthanum molybdenum oxide (La2Mo2O9, LAMOX)-based ion conductors have been used as potential electrolytes for solid oxide fuel cells. The parent compound La2Mo2O9 undergoes a structural phase transition from monoclinic (P21) to cubic (P213) at 580 °C, with an enhancement in oxide ion conductivity. The cubic phase is of interest because it is beneficial for oxide ion conduction. In search of alternative candidates with a similar structure that might have a stable cubic phase at lower temperatures, we have studied the variations of the crystal structure and ionic conductivity for 25, 50, 62.5 and 75 mol% W substitutions at the Mo site using high-temperature X-ray diffraction, dilatometry, and impedance spectroscopy. Highly dense ceramic samples have been synthesized by solid-state reaction in a two-step sintering process. Low-angle X-ray diffraction and Rietveld refinement confirm the stabilization of the cubic phase for all compounds in the entire temperature range considered. The substitutions of W at the Mo site produce a decrement in the lattice parameter. The thermal expansion coefficients in the high-temperature range of the W-substituted ceramics, as determined by dilatometry, are much higher than that of the unmodified sample. The impedance spectra have been modeled using a modified genetic algorithm within 300–600 °C. A distribution function of the relaxation times is obtained, and the contributions of ohmic drop, grains and grain boundaries to the conductivity have been identified. Overall, our investigation provides information about cationic substitution and insights into the understanding of oxide ion conductivity in LAMOX-based compounds for developing solid oxide fuel cells.

Sr3−3xNa3xSi3O9−1.5x (x = 0.45) as a superior solid oxide-ion electrolyte for intermediate temperature-solid oxide fuel cells

2014 ◽  
Vol 7 (5) ◽  
pp. 1680-1684 ◽  
Author(s):  
Tao Wei ◽  
Preetam Singh ◽  
Yunhui Gong ◽  
John B. Goodenough ◽  
Yunhui Huang ◽  
...  
Keyword(s):  
Activation Energy ◽  
Fuel Cells ◽  
Solid Oxide Fuel Cells ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Ion Conductor ◽  
Oxide Ion Conductor ◽  
Oxide Ion Conductivity ◽  
Oxide Ion Conductors ◽  
Oxide Ion

A new solid oxide-ion conductor Sr3−3xNa3xSi3O9−1.5x (x = 0.45) exhibits the highest oxide-ion conductivity with the lowest activation energy among all the known chemically stable oxide-ion conductors.

A mixed proton-oxide ion-electron conducting anode for highly coking-resistant solid oxide fuel cells

2014 ◽  
Vol 150 ◽  
pp. 55-61 ◽  
Author(s):  
Zetian Tao ◽  
Guihua Hou ◽  
Ning Xu ◽  
Qinfang Zhang ◽  
Hanping Ding
Keyword(s):  
Fuel Cells ◽  
Solid Oxide Fuel Cells ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Oxide Ion

scholarly journals Hexagonal perovskite related oxide ion conductor Ba3NbMoO8.5: phase transition, temperature evolution of the local structure and properties

2019 ◽  
Vol 7 (44) ◽  
pp. 25503-25510 ◽  
Author(s):  
Matthew S. Chambers ◽  
Kirstie S. McCombie ◽  
Josie E. Auckett ◽  
Abbie C. McLaughlin ◽  
John T. S. Irvine ◽  
...  
Keyword(s):  
Solid Oxide Fuel Cells ◽  
Local Structure ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Structure And Properties ◽  
Ion Conductor ◽  
Oxide Ion Conductor ◽  
Oxide Ion Conductivity ◽  
Reducing Conditions ◽  
Oxide Ion

Ba3NbMoO8.5 has recently been demonstrated to exhibit competitive oxide ion conductivity and to be stable under reducing conditions, making it an excellent potential electrolyte for solid oxide fuel cells.

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