Perspective on high-temperature surface oxygen exchange in a porous mixed ionic-electronic conductor for solid oxide cells

Abstract

Surface exchange coefficient (k) of porous mixed ionic-electronic conductors (MIECs) determine the device-level electrochemical performance of solid oxide cells. However, great difference is reported for k values, which are measured...

Influence of Electrode Potential on Oxygen Mobility Probed by Polarized Isotopic Exchange in Solid Oxide Electrolyser Cells: Insights for Electro‐Assisted Oxidation Reactions

“…It is difficult to explain these discrepancies, although it is known that the sample morphology (powder, dense sample, porous electrodes (where the gas diffusion can affect the mass transport) as well as the employed method (Electrical conductivity relaxation (ECR), oxygen isotopic exchange (OIE), electrochemical impedance spectroscopy (EIS)) can give quite different results [31] …”

“…[22b] It is difficult to explain these discrepancies, although it is known that the sample morphology (powder, dense sample, porous electrodes (where the gas diffusion can affect the mass transport) as well as the employed method (Electrical conductivity relaxation (ECR), oxygen isotopic exchange (OIE), electrochemical impedance spectroscopy (EIS)) can give quite different results. [31] Electrochemical Characterizations of Symmetrical Cells Symmetrical cells were prepared by screen printing inks of LSM, LSCF and LNO on dense 8-YSZ substrates 248 μm thick (see experimental section). Interfacial layers of ceria doped gadolinium oxide (CGO) were employed for the LSM and LSCF cells to inhibit the reactivity between the catalysts and YSZ electrolyte.…”