Communication Dans Un Congrès Année : 2022

Oxygen diffusion and surface exchange coefficients determined under high pressure: comparisons between oxygen deficient vs. oxygen over-stoichiometric air electrode materials

Résumé

MIEC (Mixed Ionic Electronic Conductors) oxides combine, in addition to a high electronic conductivity, high oxygen diffusivity (D) and oxygen surface exchange (k) coefficients. These properties can be directly determined thanks to the so-called IEDP (Isotopic Exchange Depth Profiling) method, which leads to determine the tracer coefficients D* and k*. To date, the reported measurements in the literature have been performed at ambient pressure and even below. However, for a higher efficiency of hydrogen production at the system level, or for a ‘Power-to-Gas’ application, it is envisaged to operate the Solid Oxide Electrolysers (SOE) at high pressures, between 10 to 60 bars. In this frame, it becomes mandatory to assess the oxygen reduction/oxidation and the transport properties of the oxygen electrodes materials in the operating conditions, i.e. when there are submitted to such high pressure (HP) at high temperature.

Domaines

Fichier principal
Vignette du fichier
EFCF-2022_Paper_B1503_IEDP_Pressure_Laurencin_Bassat_NV.pdf (450.14 Ko) Télécharger le fichier

Dates et versions

hal-03821709 , version 1 (19-10-2022)

Licence

Identifiants

  • HAL Id : hal-03821709 , version 1

Citer

Jérôme Laurencin, Aurelien Flura, Giuseppe Sdanghi, Sébastien Fourcade, Vaibhav Vibhu, et al.. Oxygen diffusion and surface exchange coefficients determined under high pressure: comparisons between oxygen deficient vs. oxygen over-stoichiometric air electrode materials. EFCF 2022: 15th European SOFC & SOE Forum, Jul 2022, Lucerne, Switzerland. B1503 (12 p.). ⟨hal-03821709⟩
169 Consultations
187 Téléchargements

Partager

  • More