A redox stable Pd-doped perovskite for SOFC applications

Structural and microstructural investigations of Pd-doped lanthanum strontium ferrite with stoichiometry La 0.6 Sr 0.4 Fe 0.95 Pd 0.05 O 3− δ (LSFPd) were carried out under oxidizing and reducing conditions using XRD, Rietveld refinement, XPS, SEM, and TEM analyses. LSFPd exhibited a smart behaviour...

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Bibliographic Details
Published in:Journal of materials chemistry. A, Materials for energy and sustainability Materials for energy and sustainability, 2019, Vol.7 (1), p.5344-5352
Main Authors: Marcucci, Andrea, Zurlo, Francesca, Sora, Isabella Natali, Placidi, Ernesto, Casciardi, Stefano, Licoccia, Silvia, Di Bartolomeo, Elisabetta
Format: Article
Language:English
Subjects:
Cations
Coarsening
Electrocatalysts
Electrochemistry
Electrolytic cells
Fuel cells
Fuel technology
High temperature
Lanthanum
Maximum power
Metal ions
Metal particles
Metals
Oxidation
Palladium
Perovskite structure
Perovskites
Reoxidation
Stoichiometry
Strontium
X ray photoelectron spectroscopy
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Summary:Structural and microstructural investigations of Pd-doped lanthanum strontium ferrite with stoichiometry La 0.6 Sr 0.4 Fe 0.95 Pd 0.05 O 3− δ (LSFPd) were carried out under oxidizing and reducing conditions using XRD, Rietveld refinement, XPS, SEM, and TEM analyses. LSFPd exhibited a smart behaviour with a reversible redox structural transformation occurring upon switching from air to hydrogen and then back to air. Exsolution of nanometric metal particles was observed after reduction, and reincorporation of metal cations onto the perovskite structure was confirmed after reoxidation. The electrochemical performances were evaluated on electrolyte supported cells using LSFPd as symmetric electrodes. The self-regenerating redox process largely improved the anodic performance of LSFPd-based SOFCs because it mitigates the coarsening of metallic electrocatalysts at high temperature promoting a redox stable behaviour. Fuel cell tests revealed promising performance in terms of maximum power output and redox stability. La 0.6 Sr 0.4 Fe 0.95 Pd 0.05 O 3− δ shows a reversible crystal structure and exhibits improved performance and redox stability when used as electrode in SOFCs.
ISSN:2050-7488
2050-7496
DOI:10.1039/c8ta10645b