Colloidal Processing of Y0.08Zr0.92O2/La0.80Sr0.20MnO3 Semi-Cells Using a Sr-Doped Lanthanum Manganite Synthesized by a Citrate Route

Abstract

In this paper, the interface between yttria stabilized zirconia (Y0.08Zr0.92O2, YSZ) electrolyte and Sr-doped lanthanum manganite (La0.80Sr0.20MnO3, LSM) cathode for solid oxide fuel cells (SOFCs) is studied. For such a purpose, the combination of a suitable synthesis route for obtaining fine powders and simple aqueous colloidal shaping routes is proposed. The synthesis of nanosized particles of La0.80Sr0.20MnO3 by a citrate route and their full characterization, including the colloidal stability and the densification and phase development determined by X-ray diffraction and electron microscopy at different temperatures, is reported. In a second step, YSZ tapes were obtained by aqueous tape casting and used as substrates for the preparation of LSM coatings by dip-coating using aqueous slurries. YSZ tapes were used either in the green state or after a pre-sintering treatment. Co-sintering at 1350 °C led to a sharp interface with excellent adhesion, also achieved when coating pre-sintered tapes. In both cases, the substrates are dense and the coatings are porous, with thicknesses of 85 and 60 μm for green and pre-sintered tapes, respectively. No diffusion of Zr and Y occurs at the LSM layer, but some diffusion of La and Mn towards the YSZ layer takes place.

Overview of Approaches to Increase the Electrochemical Activity of Conventional Perovskite Air Electrodes

“…The choice of electrode deposition method and electrode configuration usually depends on the cell design (tubular/planar configuration), which in turn determines the current characteristics of the electrode. Traditional ceramic methods of the oxygen electrode deposition in planar cells on the supporting fuel electrode, which are technologically simple and easily scalable, are slurry coating [198][199][200][201] (LSM), Refs. [202][203][204] (LSCF), screen printing [205][206][207][208][209] (LSM), Refs.…”

“…Figure 5 shows schematics of these deposition methods. deposition in planar cells on the supporting fuel electrode, which are technologically simple and easily scalable, are slurry coating [198][199][200][201] (LSM), [202][203][204] (LSCF), screen printing [205,[206][207][208][209] (LSM), [110,158,183,210,211] (LSCF), tape casting [212][213][214][215] (LSM), [174,180,216,217] (LSCF), spraying [212,[218][219][220][221] (LSM), [170,173,[222][223][224] (LSCF). Figure 5 shows schematics of these deposition methods.…”