Study of strontium doped Nd2FeO4+δ cathode material for intermediate temperature solid oxide fuel cells application

The series of Nd2–x Sr x FeO4+δ (x = 0.1 - 0.4) single phase compound is prepared with crystallite size in submicron range using combustion synthesis technique. The agglomeration of the submicron sized crystallites resulted into formation of porous electrode layer is realized from scanning electron...

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Bibliographic Details
Published in:Journal of physics. Conference series 2021-05, Vol.1913 (1)
Main Authors: Punde, J D, Chaudhari, V N
Format: Article
Language:English
Subjects:
cathode materials
Cathodes
Charge transfer
Combustion synthesis
Crystallites
dc conductivity
EIS study
Electrode materials
Electrolytic cells
FeO
IT-SOFC
Oxygen reduction reactions
Partial pressure
Physics
Pressure dependence
Solid oxide fuel cells
symmetric cell
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Summary:The series of Nd2–x Sr x FeO4+δ (x = 0.1 - 0.4) single phase compound is prepared with crystallite size in submicron range using combustion synthesis technique. The agglomeration of the submicron sized crystallites resulted into formation of porous electrode layer is realized from scanning electron microscopy. The dcconductivity results showed maximum σ for x = 0.2, which also exhibited minimum activation energy. The comparative low dc conductivity with literature reports is due to high porosity as obtained from agglomerated submicron crystallites. Variation in conductivity in Nd2–x Sr x FeO4+δ is Sr-dependent and understood f rom defect chemistry. The complex impedance plots of the symmetric cell showed decrease in the real axis intercept with increased temperature in turn reduced area specific resistance (ASR). Nd1.8Sr0.2FeO4+δ cathode exhibits lowest ASR (= 1.92±0.015 Ohm cm2) at 973 K. The oxygen partial pressure dependent ASR indicated that the charge transfer at electrode-electrolyte interface is the rate limiting factor while oxygen reduction reaction (ORR).
ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/1913/1/012012