A Co-free perovskite material, La0.7Sr0.3Cu0.15Fe0.85O3-?, is synthesized and electrochemically characterized to evaluate its potential application as electrocatalyst in the air electrode of solid oxide cells. The powder was firstly synthesized by the sol-gel method and subsequently morphologically and structurally characterized by scanning electron microscope and X-ray diffraction. Symmetrical circular button cells featuring Sm-doped ceria (20% Sm) as supporting electrolyte and La0.7Sr0.3Cu0.15Fe0.85O3-? as electrocatalyst were manufactured to carry out electrochemical investigations. Two different electrode morphologies are analyzed. In the first structure, the La0.7Sr0.3Cu0.15Fe0.85O3-? calcined powders are directly deposited by slurry coating on a dense sintered supporting pellet of Sm-doped ceria. In the second electrode configuration, the precursor solution of La0.7Sr0.3Cu0.15Fe0.85O3-? impregnates a porous scaffold of Sm- doped ceria, previously deposited and co-sintered with the supporting electrolyte. The performance of the samples was studied by means of electrochemical impedance spectroscopy, measuring polarization resistances of 0.0153 ?cm2 at 700 °C and 0.052 ?cm2 at 600 °C for the slurry coated and infiltrated electrodes, respectively. These values, according to the authors knowledge, are amongst the lowest ever obtained for Co-free solid oxides electrodes. However, the very high electrocatalytic activity obtained at intermediate temperatures is not accompanied by chemical stability over time.

A High-Performance Co-Free Electrode for Solid Oxide Cells: La0.7Sr0.3Cu0.15Fe0.85O3-? Synthesis and Characterisation

Basbus Juan Felipe;Viviani Massimo;Presto Sabrina;Barbucci Antonio;
2023

Abstract

A Co-free perovskite material, La0.7Sr0.3Cu0.15Fe0.85O3-?, is synthesized and electrochemically characterized to evaluate its potential application as electrocatalyst in the air electrode of solid oxide cells. The powder was firstly synthesized by the sol-gel method and subsequently morphologically and structurally characterized by scanning electron microscope and X-ray diffraction. Symmetrical circular button cells featuring Sm-doped ceria (20% Sm) as supporting electrolyte and La0.7Sr0.3Cu0.15Fe0.85O3-? as electrocatalyst were manufactured to carry out electrochemical investigations. Two different electrode morphologies are analyzed. In the first structure, the La0.7Sr0.3Cu0.15Fe0.85O3-? calcined powders are directly deposited by slurry coating on a dense sintered supporting pellet of Sm-doped ceria. In the second electrode configuration, the precursor solution of La0.7Sr0.3Cu0.15Fe0.85O3-? impregnates a porous scaffold of Sm- doped ceria, previously deposited and co-sintered with the supporting electrolyte. The performance of the samples was studied by means of electrochemical impedance spectroscopy, measuring polarization resistances of 0.0153 ?cm2 at 700 °C and 0.052 ?cm2 at 600 °C for the slurry coated and infiltrated electrodes, respectively. These values, according to the authors knowledge, are amongst the lowest ever obtained for Co-free solid oxides electrodes. However, the very high electrocatalytic activity obtained at intermediate temperatures is not accompanied by chemical stability over time.
2023
Istituto di Chimica della Materia Condensata e di Tecnologie per l'Energia - ICMATE
Perovskite
Cobalt-free
Infiltration
backbone
Solid Oxide Cells
Air Electrode
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.14243/456593
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