Title :

Electrostatic spray deposition of Ca3Co4O9+δ layers to be used as cathode materials for IT-SOFC

Author(s) :

Djurado, E. [Auteur]
Salaün, A. [Auteur]
Mignardi, G. [Auteur]
Rolle, Aurelie [Auteur]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Burriel, M. [Auteur]
Daviero-Minaud, Sylvie [Auteur]
Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Vannier, Rose-Noelle [Auteur]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]

Journal title :

Solid State Ionics

Volume number :

286

Pages :

102-110

Publication date :

2016-03

HAL domain(s) :

Chimie/Chimie inorganique

English abstract : [en]

In this paper, the deposition of Ca3Co4O9 + δ layers on CGO substrates using electrostatic spray deposition (ESD) technique, starting from calcium and cobalt nitrates as precursor salts, is reported. The microstructure was ...
Show more >In this paper, the deposition of Ca3Co4O9 + δ layers on CGO substrates using electrostatic spray deposition (ESD) technique, starting from calcium and cobalt nitrates as precursor salts, is reported. The microstructure was investigated as a function of process parameters such as nozzle-to-substrate distance, solvent composition, substrate temperature, flow rate and deposition time, based on an upper and a lower value. Films with controlled microstructures were obtained after annealing at 880 °C for 2 h in air. The formation of Ca3Co4O9 + δ was confirmed by X-ray diffraction, which also showed evidence of Co3O4 traces. As shown by in-situ X-ray diffraction, Ca3Co4O9 + δ starts to form at 625 °C and decomposes at 950 °C, but the transformation is reversible. Interestingly, the initial morphology of the films was maintained after annealing at either 700 or 880 °C, with the appearance of faceted crystals forming a gypsum flower-like microstructure. AC impedance spectroscopy was carried out at intermediate temperatures (600–800 °C) under air on 2 batches of symmetrical cells based on ESD and screen-printed electrodes, respectively. This work confirmed the beneficial impact of the ESD technique. The area-specific resistance was improved by at least 23% at 600 °C and 40% at 800 °C for the sample prepared by ESD compared to the reference one prepared by screen printing. This improvement was explained by a better interface between the electrode and the electrolyte.Show less >

Language :

Anglais

Audience :

Internationale

Popular science :

Non

Administrative institution(s) :

ENSCL
CNRS
Centrale Lille
Univ. Artois
Université de Lille

Collections :

• Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181

Research team(s) :

Matériaux inorganiques, structures, systèmes et propriétés (MISSP)
Matériaux oxydes pour énergie
Oxydes Innovants

Submission date :

2019-09-24T14:35:18Z