resumo
Efficient use of barium-containing electrocatalysts for NOx decomposition in electrochemical solid oxide cells requires good chemical compatibility of these materials with the electrolyte in a temperature range 300-600 degrees C and imply the use of porous electrolytes allowing significant gas flows across the cell. BaZr0.85Y0.15O3 electrolyte has good chemical compatibility with Ba-containing materials and potentially appropriate level of ionic conductivity. This work is focused on guidelines for processing BaZr0.85Y0.15O3 ceramics with cellular porosity (i.e., with spherical pores and with developed gas interconnections), using emulsification of paraffin in water-based ceramic suspension. Porosity of sintered at 1500 degrees C ceramics is practically open and varies in the range of 70-84%, with average pore sizes in the range similar to 3-30 mu m. The type of pore size distribution is close to log-normal. Microstructure, average cell size and level of gas permeability mainly depends on surfactant content, while total porosity is mostly determined by paraffin content.
palavras-chave
NITRIC-OXIDE; DECOMPOSITION; MICROSTRUCTURE; STABILITY; PARAFFIN; EMULSION; REMOVAL
categoria
Materials Science
autores
Zakharchuk, K; Yaremchenko, A; Kovalevsky, A
nossos autores
Aleksey Yaremchenko
Investigador Principal
Andrei Kavaleuski
Investigador principal
Kiryl Zakharchuk
Estudante de doutoramentoProjectos
CICECO - Aveiro Institute of Materials (UIDB/50011/2020)
CICECO - Aveiro Institute of Materials (UIDP/50011/2020)
Associated Laboratory CICECO-Aveiro Institute of Materials (LA/P/0006/2020)
agradecimentos
This work was developed within the scope of the project SFRH/BD/138773/2018 and the project CICECO -Aveiro Institute of Materials (UIDB/50011/2020, UIDP/50011/2020 & LA/P/0006/2020) financed by national funds through the FCT/MCTES and when appropriate cofinanced by FEDER under the PT2020 Partnership Agreement.