Impact of Preparation Method and Y2 O3 Content on the Properties of the YSZ Electrolyte

• Main Authors: Adamová, N. (Author), Bouzek, K. (Author), Budáč, D. (Author), Carda, M. (Author), Paidar, M. (Author), Rečková, V. (Author)
• Format: Article
• Language: English
• Published: MDPI 2022
• Subjects: Combustion synthesis; conductivity; Conductivity; Decomposition; dopant content; Dopant content; Morphology; Particle size analysis; powder synthesis; Powder synthesis; Preparation method; shape molding; Shape molding; Sintering; Solid electrolytes; solid oxide cells; Solid oxide fuel cells (SOFC); Solid-oxide cells; YSZ; Yttria stabilized zirconia; Yttria stabilized zirconia powders; yttria-stabilized zirconia; Yttria-stabilized zirconia electrolyte; Yttria-stabilized-zirconia; Yttrium metallography; Yttrium oxide
• Online Access: View Fulltext in Publisher

 This study is an effort to cover and interconnect multiple aspects of the fabrication of the yttria-stabilized zirconia (YSZ) from powder preparation to a solid electrolyte suitable for utilization in solid oxide cells. Thus, a series of YSZ electrolytes was prepared, differing in the content of the Y2 O3 dopant and in the method of preparation. Combustion synthesis along with the thermal decomposition of precursors was used for YSZ powder synthesis with a dopant content of 8 to 18 mol.%. Post-synthesis treatment of the powder was necessary for achieving satisfactory quality of the subsequent sintering step. The morphology analyses of the YSZ powders and sintered electrolytes produced proved that small particles with a uniform size distribution are essential for obtaining a dense electrolyte. Furthermore, the conductivity of YSZ electrolytes with different Y2 O3 contents was examined in the temperature range of 400 to 800◦ C. The lowest conductivity was found for the sample with the highest Y2 O3 content. The obtained results enable the preparation methods, YSZ powder morphology, and composition to be connected to the mechanical and electrochemical properties of the YSZ electrolyte. Thus, this study links every step of YSZ electrolyte fabrication, which has not been sufficiently clearly described until now. © 2022 by the authors. Licensee MDPI, Basel, Switzerland.