Impedance spectroscopy analysis of La1 − xSritxMnO3-yttria-stabilized zirconia electrode kinetics

An EIS study of La2 − x Sr x NiO4 + δ SOFC cathodes

“…The interpretation of the EIS data can be done accordingly to the mechanism suggested for perovskite based electrodes by Siebert et al [18] and others [19]. In this mechanism the high frequency arc is suggested to be due to transfer of oxide ions at the electrode-electrolyte interface.…”

“…No detailed study of the mechanism, for the reduction of oxygen on this type of cathode materials, has been made. However, if the same mechanism as for perovskites is valid then the medium frequency arc is due to diffusion of oxide anions in the bulk of the electrode [18,19]. This indicates that the ionic conductivity of the La 2-x Sr x NiO 4-δ materials find its maximum for the compound with x = 0.25 as the magnitude of the medium frequency arc is lowest for this compound.…”

“…For the compound with x = 0.35 only a low amount of oxide ion vacancies will be present in the structure leading to a low oxide ionic conductivity. The low frequency arc is for perovskites normally attributed to a slow redox reaction at the surface of the electrode [18,19].…”

Effect of impregnation of La0.85Sr0.15MnO3/yttria stabilized zirconia solid oxide fuel cell cathodes with La0.85Sr0.15MnO3 or Al2O3 nano-particles

“…The low frequency arc is the one that decreases the most. This arc is normally attributed to a slow oxygen-exchange reaction at the surface of the electrode [11]. This arc is probably minimized due to a larger surface area of the LSM in the electrodes due to the small particles formed as a result of the impregnation with LSM15, see Figure 2.…”

“…This arc is also affected by the LSM15 impregnation. The high frequency arc is known to be due to transport of oxide ions across the electrode/electrolyte interface [11,12]. This arc is also affected by the impregnation with LSM15.…”