Comparison Between Ultrathin Films of YSZ Deposited at the Solid OxideFuel Cell Cathode/Electrolyte Interface by Atomic Layer Deposition, Dip-Coating or Sputtering

摘要

The effect of an 80 nm YSZ interfacial layer, deposited onto a YSZ pellet by different techniques (dip-coating,sputtering and atomic layer deposition) at the SOFC cathode/electrolyte interface to allow a maximum adhesion of thethick cathode layer, was thoroughly analysed. The LSM cathode was deposited on the solid electrolyte by painting andsintered in air at 1200°C for 2 h. The morphological and structural analyses of the samples were performed by scanningelectron microscopy and X-ray diffraction; their electrical properties were examined between 390 and 700°C byelectrochemical impedance spectroscopy. The impedance responses showed three different contributions. The highfrequencyarc is attributed to the YSZ electrolyte. The electrode processes associated with the medium- and lowfrequencyarcs were discussed. The electrochemical performance was influenced by the microstructure at theelectrode/electrolyte interface.