The effect of A-site deficiency on the performance of La1-sFe0.4Ni0.6O3-delta cathodes

Kent Kammer Hansen

doi:10.1016/j.materresbull.2009.09.024

The effect of A-site deficiency on the performance of La1-sFe0.4Ni0.6O3-delta cathodes

Kent Kammer Hansen

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Abstract

The effect of lowering the A-site stoichiometry of La-Fe-Ni based perovskite solid oxide fuel cell cathodes was investigated with electrochemical impedance spectroscopy on cone-shaped electrodes using a Ce0.9Gd0.1O1.95 electrolyte. It was shown that a lowering of the A-site stoichiometry lowers the amount of Ni in the perovskite phase, as powder XRD revealed that NiO was expelled from the perovskite lattice when the A-site stoichiometry was decreased. NiO inhibit the reduction of oxygen as the activity of a nominally A-site deficient La1-sFe0.4Ni0.6O3- perovskite was worse than the activity of the corresponding LaFe0.4+sNi0.6-sO3- perovskite without NiO. NiO is therefore poison for the reduction of oxygen at the cathode in a solid oxide fuel cell.

Original language	English
Journal	Materials Research Bulletin
Volume	45
Issue number	2
Pages (from-to)	197-199
ISSN	0025-5408
DOIs	https://doi.org/10.1016/j.materresbull.2009.09.024
Publication status	Published - 2010

Keywords

Solid Oxide Fuel Cells
Fuel Cells and hydrogen

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10.1016/j.materresbull.2009.09.024

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title = "The effect of A-site deficiency on the performance of La1-sFe0.4Ni0.6O3-delta cathodes",

abstract = "The effect of lowering the A-site stoichiometry of La-Fe-Ni based perovskite solid oxide fuel cell cathodes was investigated with electrochemical impedance spectroscopy on cone-shaped electrodes using a Ce0.9Gd0.1O1.95 electrolyte. It was shown that a lowering of the A-site stoichiometry lowers the amount of Ni in the perovskite phase, as powder XRD revealed that NiO was expelled from the perovskite lattice when the A-site stoichiometry was decreased. NiO inhibit the reduction of oxygen as the activity of a nominally A-site deficient La1-sFe0.4Ni0.6O3- perovskite was worse than the activity of the corresponding LaFe0.4+sNi0.6-sO3- perovskite without NiO. NiO is therefore poison for the reduction of oxygen at the cathode in a solid oxide fuel cell.",

keywords = "Solid Oxide Fuel Cells, Fuel Cells and hydrogen, Br{\ae}ndselsceller og brint",

author = "{Kammer Hansen}, Kent",

year = "2010",

doi = "10.1016/j.materresbull.2009.09.024",

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pages = "197--199",

journal = "Materials Research Bulletin",

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T1 - The effect of A-site deficiency on the performance of La1-sFe0.4Ni0.6O3-delta cathodes

AU - Kammer Hansen, Kent

PY - 2010

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N2 - The effect of lowering the A-site stoichiometry of La-Fe-Ni based perovskite solid oxide fuel cell cathodes was investigated with electrochemical impedance spectroscopy on cone-shaped electrodes using a Ce0.9Gd0.1O1.95 electrolyte. It was shown that a lowering of the A-site stoichiometry lowers the amount of Ni in the perovskite phase, as powder XRD revealed that NiO was expelled from the perovskite lattice when the A-site stoichiometry was decreased. NiO inhibit the reduction of oxygen as the activity of a nominally A-site deficient La1-sFe0.4Ni0.6O3- perovskite was worse than the activity of the corresponding LaFe0.4+sNi0.6-sO3- perovskite without NiO. NiO is therefore poison for the reduction of oxygen at the cathode in a solid oxide fuel cell.

AB - The effect of lowering the A-site stoichiometry of La-Fe-Ni based perovskite solid oxide fuel cell cathodes was investigated with electrochemical impedance spectroscopy on cone-shaped electrodes using a Ce0.9Gd0.1O1.95 electrolyte. It was shown that a lowering of the A-site stoichiometry lowers the amount of Ni in the perovskite phase, as powder XRD revealed that NiO was expelled from the perovskite lattice when the A-site stoichiometry was decreased. NiO inhibit the reduction of oxygen as the activity of a nominally A-site deficient La1-sFe0.4Ni0.6O3- perovskite was worse than the activity of the corresponding LaFe0.4+sNi0.6-sO3- perovskite without NiO. NiO is therefore poison for the reduction of oxygen at the cathode in a solid oxide fuel cell.

KW - Solid Oxide Fuel Cells

KW - Fuel Cells and hydrogen

KW - Brændselsceller og brint

U2 - 10.1016/j.materresbull.2009.09.024

DO - 10.1016/j.materresbull.2009.09.024

M3 - Journal article

SN - 0025-5408

VL - 45

SP - 197

EP - 199

JO - Materials Research Bulletin

JF - Materials Research Bulletin

IS - 2

ER -

The effect of A-site deficiency on the performance of La1-sFe0.4Ni0.6O3-delta cathodes

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