Influence of architecture for nanostructured Pr 6 O 11 and GDC composite oxygen electrodes on their electrochemical properties and stability - Université Grenoble Alpes Accéder directement au contenu
Communication Dans Un Congrès Année : 2023

Influence of architecture for nanostructured Pr 6 O 11 and GDC composite oxygen electrodes on their electrochemical properties and stability

Résumé

The improvement of the electrochemical behavior of solid oxide cells (SOC) strongly depends on optimizing the oxygen electrode architecture and the choice of electrochemically active materials. Lanthanide-nickelates are considered as interesting candidates for the active functional layer in high- to intermediate temperature SOC, however thermally induced cell deterioration remains a challenge. Based on decomposition studies of praseodymium-nickelate (Pr2NiO4+δ, PNO) [1], the electrochemical properties of one of its decomposition products, Pr6O11, were investigated by Rakesh et al. [2]. For nanostructured Pr6O11 electrodes, deposited by means of electrostatic spray deposition (ESD) on top of GDC (Ce0.9Gd0.1O2−δ) electrolytes, exceptional low values of polarization resistance were found (0.02 Ω cm 2 at 600 °C). Combined with the observed chemical stability (10 days, 800 °C, air), the material was considered a potentially interesting SOC oxygen electrode material for intermediate temperature application. The focus of this work was put on the synthesis and electrochemical testing of Pr6O11-GDC composite electrodes by ESD and screen-printing (SP) with the aim to increase the electrochemically active interface (triple-phase boundary, TPB) between electrolyte and electrode material and to support ionic charge transfer. Specifically, the influence of electrode architecture was investigated by comparing double-layer (Pr6O11 topped by a LSM current collecting layer (CCL)) and triple-layer architectures (Pr6O11 on porous, screen-printed GDC, topped by a LSM-CCL), which were prepared based on previous work [3]. In this talk, the impact of ESD parameters and sintering conditions on the Pr6O11 electrode nanostructure is presented, as well as the importance of a minimum CCL thickness. As a consequence of different grain sizes and porosity at the Pr6O11-GDC interface, an emphasis is put on the development of polarization resistance values. Finally, the study of an “ex-situ” composite triple-layer architecture Pr6O11-GDC cell is discussed.

Domaines

Chimie
Fichier non déposé

Dates et versions

hal-04123232 , version 1 (09-06-2023)

Identifiants

  • HAL Id : hal-04123232 , version 1

Citer

Michael Spann, Lydia Yefsah, Rakesh Sharma, César Steil, Laurent Dessemond, et al.. Influence of architecture for nanostructured Pr 6 O 11 and GDC composite oxygen electrodes on their electrochemical properties and stability. Journées Plénières de la Fédération de recherche Hydrogène, CNRS, May 2023, St Gilles de la Réunion, France. ⟨hal-04123232⟩
8 Consultations
4 Téléchargements

Partager

Gmail Mastodon Facebook X LinkedIn More