Preparation and characterization of yttria stabilized zirconia (YSZ) films deposited by dip-coating on LSM-YSZ substrate with different proportions

Abstract

In this work, sol-gel/dip-coating process for obtaining yttria stabilized zirconia (YSZ, ZrO 2-8% Y 2 O 3) films deposited onto LSM-YSZ (lanthanum strontium manganite (LSM, La0.7Sr0.3MnO3) mixed with YSZ) with different proportions (20/80, 50/50, 80/20) was investigated. The films were deposited on substrate varying the number of layers deposited. LSM powders were obtained by the combustion method using metal nitrates and urea and YSZ was commercial. LSM-YSZ composite powders were obtained by the solid state method, through ball-milling of a mixture of LSM-YSZ (mass ratio) powder for 4 h with 500 rpm using ZrO2 balls as milling media. For LSM-YSZ substrate a study of sintering temperature was performed, where the optimum sintering temperature for each LSM-YSZ studied proportion was obtained. According to our results, it was found that 1100 ºC is the optimum sintering temperature for 20/80, 950 ºC is the optimum sintering temperature for 50/50 and 900 ºC is the optimum sintering temperature for 80/20 because of the good phase formation. The films were characterized by X-ray Diffraction (XRD) and Scanning Electron Microscopy (SEM). The films showed LSM, YSZ, SrZrO3 and La2O3 phases. Crack-free, homogeneous and well adhered films were obtained with a thickness between 3 and 38 µm. In this work, YSZ films with appropriate thickness were obtained for application as SOFC electrolyte.

(Digital Presentation) Fabrication and Characterization of 4Sc4YSZ/LSM-4Sc4YSZ Novel Electrode-Supported Half-Cell Composition for Solid Oxide Electrochemical Cells

“…Thin film solid electrolytes are currently developed to alleviate the ohmic resistance that is derived from thicker solid electrolytes. For typical YSZ thin films, the most suitable thickness values for SOC electrolyte applications are between 5-30 µm (6). To employ this design, an electrodesupported cell must be realized.…”

“…Composite electrodes such as LSM-YSZ are utilized because they retain the key properties of both components that can ensure enhanced functionality without the formation of unwanted reactions (9). The addition of YSZ increases its TPB which extends the electrode reaction sites consequently reducing the electrode polarization and increasing the electrode/electrolyte interface (6). However, YSZ-based electrodes have low ionic conductivity at intermediate temperatures.…”

Microstructural Property Investigation of LSM-4Sc4YSZ Novel Composite Electrode Prepared Using All-Alkoxide Sol-Gel and Solid-State Reaction Methods for Solid Oxide Electrochemical Cells

“…LSM is known for its high electronic conductivity and compatibility with YSZ. The addition of YSZ to LSM increases the TPB extending the electrode reaction sites and significantly reducing the electrode polarization and increasing the electrode/electrolyte interface [3]. However, conductivity values for YSZ at lower operating temperatures are not high enough that it limits its applications for intermediate-temperature (IT) SOCs [2].…”