Sucrose-Assisted Solution Combustion Synthesis of Doped Strontium Ferrate Perovskite-Type Electrocatalysts: Primary Role of the Secondary Fuel

The methodologies and experimental conditions used for the synthesis of cathode materials for electrochemical devices strongly influence their electrocatalytic performance. In particular, solution combustion synthesis is a convenient and versatile methodology allowing a fine-tuning of the properties...

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Bibliographic Details
Published in:Catalysts 2020-01, Vol.10 (1), p.134
Main Authors: Tummino, Maria Laura, Liotta, Leonarda Francesca, Magnacca, Giuliana, Lo Faro, Massimiliano, Trocino, Stefano, Campagna Zignani, Sabrina, Aricò, Antonino Salvatore, Deganello, Francesca
Format: Article
Language:English
Subjects:
Catalysts
Cerium oxides
Chemical reactions
Combustion synthesis
Efficiency
Electrical resistivity
Electrocatalysts
Electrochemical analysis
Electrode materials
Electrodes
Electrolytes
Fuel mixtures
Gadolinium
Molecular weight
Morphology
Perovskites
Polyethylene glycol
Solid oxide fuel cells
Sucrose
Thermogravimetric analysis
Vapor phases
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Summary:The methodologies and experimental conditions used for the synthesis of cathode materials for electrochemical devices strongly influence their electrocatalytic performance. In particular, solution combustion synthesis is a convenient and versatile methodology allowing a fine-tuning of the properties of the material. In this work, we used for the first time a sucrose assisted-solution combustion synthesis for the preparation of Cerium and Cobalt-doped SrFeO3–δ electrocatalysts and we investigated the effect of polyethylene glycol (PEG) addition as a secondary fuel on their structural, microstructural, redox and electrochemical properties. The perovskite-type powders were characterized by X-ray diffraction coupled with Rietveld refinement, scanning, and high-resolution transmission electron microscopies, thermogravimetric analysis, nitrogen adsorption measurements, and temperature-programmed reduction. Electrical conductivity and overpotential measurements were performed after the deposition of the powders onto a Gd-doped ceria electrolyte pellet. Stable high-valence B-site cations were detected in the powders prepared from sucrose-PEG fuel mixtures, although a substantial improvement of the conductivity and a decrease of the overpotential values were obtained only with high molecular weight PEG. The superior electrochemical performance obtained using PEG with high molecular weight has been ascribed to a faster interaction of the powder with the oxygen gas phase favored by the nanometer-sized crystalline domains.
ISSN:2073-4344
2073-4344
DOI:10.3390/catal10010134