Ln 2 NiO 4+δ (Ln = La, Pr, Nd) coatings deposited by reactive magnetron sputtering as cathode material for intermediate temperature solid oxide fuel cell

Jérémie Fondard (1, 2) , Alain Billard (1, 2) , Ghislaine Bertrand (3) , Pascal Briois (1, 2)

1 FEMTO-ST - Franche-Comté Électronique Mécanique, Thermique et Optique - Sciences et Technologies (UMR 6174)
2 FCLAB - Fuel Cell LAB : Vers des Systèmes Pile à Combustible Efficients
3 CIRIMAT - Centre interuniversitaire de recherche et d'ingenierie des matériaux

This work focuses on the comparison of Ln-Ni-O coatings (Ln = La, Nd, Pr) deposited by reactive magnetron sputtering using Plasma Emission Monitoring (PEM) which allows high deposition rate. Each layer is deposited by different steps. The optimal regulation setpoint for oxide rare-earth deposition is determined and then the current dissipated on the nickel target is adjusted to obtain the convenient Ln/Ni ratio and to achieve the K2NiF4 structure. After an appropriate annealing treatment, all coatings exhibit crystalline structures, which depend on the Ln/Ni ratio. Due to the instability of Pr2NiO4 structure at intermediate temperatures, the crystallization step of praseodymium nickelate is performed at higher temperature than the other materials. This further thermal treatment implies a more porous structure. Each coating exhibits interesting properties. Electrical and electrochemical characterizations performed on these deposits prove better properties of the praseodymium nickelate coating.

Mots clés: Rare-earth nickelates; Reactive magnetron sputtering; Intermediate-temperature solid oxide fuel cell (IT-SOFC); Elaboration; Electrochemical properties

Domaines: Matériaux; Energie électrique; Acoustique [physics.class-ph]; Micro et nanotechnologies/Microélectronique

Jérémie Fondard, Alain Billard, Ghislaine Bertrand, Pascal Briois. Ln 2 NiO 4+δ (Ln = La, Pr, Nd) coatings deposited by reactive magnetron sputtering as cathode material for intermediate temperature solid oxide fuel cell. Vacuum, 2018, 152, pp.97-108. ⟨10.1016/j.vacuum.2018.03.013⟩. ⟨hal-02331025⟩