Ln2NiO4+δ (Ln = La, Pr, Nd) coatings deposited by reactive magnetron sputtering as cathode material for intermediate temperature solid oxide fuel cell
Abstract
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.
- Publication:
-
Vacuum
- Pub Date:
- June 2018
- DOI:
- 10.1016/j.vacuum.2018.03.013
- Bibcode:
- 2018Vacuu.152...97F
- Keywords:
-
- Rare-earth nickelates;
- Reactive magnetron sputtering;
- Intermediate-temperature solid oxide fuel cell (IT-SOFC);
- Elaboration;
- Electrochemical properties