Impedance spectroscopic study on well-defined (La,Sr)(Co,Fe)O3−δ model electrodes

Electrochemical studies of capacitance in cerium oxide thin films and its relationship to anionic and electronic defect densities

“…It has been shown elsewhere, 15,17 from a solution of the fundamental transport equations, that the analytical impedance response of a MIEC can be rigorously mapped to an equivalent circuit in which C chem explicitly appears. Modification of that result for the present configuration, in which the bulk electronic and ionic resistances of the MIEC thin film are much smaller than the surface reaction resistance, 16,24,34 the MIEC7IC interface is taken to be reversible to oxygen ions and blocking to electrons, and the porous metal7MIEC interface is taken to be reversible to electrons, yields an equivalent circuit model that is remarkably simple (Fig. 1, inset), particularly given the complexity of the network in the absence of the pure ionic conductor substrate.…”

High electrode activity of nanostructured, columnar ceria films for solid oxide fuel cells

“…16 , 20 Hz) on both sides of the YSZ electrolyte. The PLD targets were prepared from high purity commercial SDC (Nextech Materials).…”

Evolution of the electrochemical interface in high-temperature fuel cells and electrolysers

“…For MIEC oxygen-electrode materials the 2PB pathway dominates. For most perovskites, the electrode polarisation resistance (Rp) is dominated by the oxygen surface exchange reaction 23 with the rate determining step involving both oxygen vacancies and molecular oxygen 24 . Recent experimental findings show that near surface oxygen anions demonstrate significant redox activity in relation to oxygen adsorption, associated with strong hybridization between oxygen 2p and transition metal 3d electronic states 25 .…”