Intermediate Temperature Solid Oxide Fuel Cells Using LaGaO[sub 3] Electrolyte II. Improvement of Oxide Ion Conductivity and Power Density by Doping Fe for Ga Site of LaGaO[sub 3]

SrFe0.9Al0.1O3-δ(SFA) powder was mixed with a different mass content of SDC 10, 20 and 30 wt.% to form SFA-SDC composite cathodes subsequently investigated as potential IT-SOFC cathodes on LSGM electrolytes. No obvious reaction products between SDC (or LSGM) and SFA occur under test for the cathode of SOFCs. As SOFC cathodes, the area-specific resistances of the SFA-SDC cathodes on the LSGM electrolyte with SDC 10, 20 and 30 wt.% at 800 oC are 0.089, 0.068 and 0.087 Ω cm2, respectively. The peak power density of the SFA-SDC20 on a 300 μm-thick LSGM electrolyte reach 512 mW cm−2 at 800 °C.

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Superior Oxide Ion Conductivity of Novel Acceptor Doped Cerium Oxide Electrolytes for Intermediate-Temperature Solid Oxide Fuel Cell Applications

The Journal of Physical Chemistry C ◽

10.1021/acs.jpcc.6b05873 ◽

2016 ◽

Vol 120 (33) ◽

pp. 18452-18461 ◽

Cited By ~ 14

Author(s):

Kanagaraj Amarsingh Bhabu ◽

Jayaraman Theerthagiri ◽

Jagannathan Madhavan ◽

Thangaraj Balu ◽

Thanjavur Renganathan Rajasekaran

Keyword(s):

Fuel Cell ◽

Solid Oxide Fuel Cell ◽

Cerium Oxide ◽

Solid Oxide ◽

Ion Conductivity ◽

Intermediate Temperature ◽

Oxide Fuel ◽

Oxide Ion Conductivity ◽

Oxide Ion

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ChemInform Abstract: Intermediate Temperature Solid Oxide Fuel Cells Using a New LaGaO3 Based Oxide Ion Conductor. Part 1. Doped SmCoO3 as a New Cathode Material.

ChemInform ◽

10.1002/chin.199844012 ◽

2010 ◽

Vol 29 (44) ◽

pp. no-no

Author(s):

T. ISHIHARA ◽

M. HONDA ◽

T. SHIBAYAMA ◽

H. MINAMI ◽

H. NISHIGUCHI ◽

...

Keyword(s):

Fuel Cells ◽

Solid Oxide Fuel Cells ◽

Cathode Material ◽

Solid Oxide ◽

Intermediate Temperature ◽

Oxide Fuel ◽

Ion Conductor ◽

Oxide Ion Conductor ◽

Oxide Ion

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A Finite Length Cylinder Model for Mixed Oxide-Ion and Electron Conducting Cathodes Suited for Intermediate-Temperature Solid Oxide Fuel Cells

Journal of The Electrochemical Society ◽

10.1149/2.1011606jes ◽

2016 ◽

Vol 163 (6) ◽

pp. F548-F563 ◽

Cited By ~ 3

Author(s):

Xinfang Jin ◽

Jie Wang ◽

Long Jiang ◽

Ralph E. White ◽

Kevin Huang

Keyword(s):

Fuel Cells ◽

Solid Oxide Fuel Cells ◽

Finite Length ◽

Mixed Oxide ◽

Solid Oxide ◽

Intermediate Temperature ◽

Oxide Fuel ◽

Cylinder Model ◽

Oxide Ion

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

Ceramics ◽

10.3390/ceramics4030037 ◽

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.

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