In application to the technology of SOFC creation, the prospects of the electrophoretic deposition (EPD) method of nanostructured coatings have been investigated. In particular, a method has been proposed for barium conservation during the formation of a thin-film proton-conducting electrolyte BaCe0.89Gd0.1Cu0.01O3-δ through the use of a modified La1.7Ba0.3NiO4+δ cathode. Methods for preserving the porous structure of a multilayer cathode substrate (porosity 35–40%, collector layer up to 1 mm and functional layer of 5 μm) have been studied during EPD and sintering of a thin-film electrolyte. It has been established that in the cyclic EPD process and sintering of an electrolyte film (8 μm), the cathode substrate retains the porous structure and gas permeability necessary for the operation of SOFC.
The prospects of the electrophoretic deposition method of nanostructured coatings are investigated in relation to the technology of creating SOFC. A method for preserving barium in a solid electrolyte layer during sintering is proposed. It is shown that the presence of a bulk LBNO substrate and the simultaneous use of BaCO3 as a protective filler can be an effective way to preserve the barium content in the BCGCuO electrolyte during high-temperature sintering. It was found that a thin sublayer of LBNO (approximately 10 microns) is less effective in this respect, and when using an LNFO substrate with and without a sublayer, the only method to prevent the loss of barium in the electrolyte layer is to increase its thickness above 20 microns. Comparative studies of suspensions of powders ZrO2 – 8 моль% Y2O3 (8YSZ): YSZ_Tosoh (Tosoh commercial powder, dБЭТ=58 nm) and YSZ_LIK (nanopowder obtained by laser ablation in the IEP of the Ural Branch of the Russian Academy of Sciences, dБЭТ=18 nm) were performed. Different effects of ultrasonic treatment on the dispersed composition of suspensions were determined: in suspensions of YSZ_Tosoh powder, in contrast to YSZ_LIK nanopowder, there is no destruction of aggregates. When using suspensions of YSZ_LIK nanopowder, good sinterability of the obtained EPD layers on La2NiO4 cathode substrates at a temperature of 1350°C was established.
The possibilities of the widely used laser ablation method, i.e., the evaporation of a substance by laser radiation followed by the formation of nanoparticles in a buffer gas stream, for the production of nanoscale particles of the compositions Ce3+:Y2O3, Pr3+:Y2O3, Ce3+:(LaxY1-x)2O3 and Pr3+:(LaxY1-x)2O3 are investigated. The average size of the nanoparticles was 14-17 nm. In the course of experiments, it was found that a decrease in the pulse duration of the laser radiation of the LC-1 fiber ytterbium laser (IRE-Polyus) from 100 to 60 microseconds leads to a shift in the particle size distribution to a lower average value and a narrower peak. The structural, morphological, and chemical properties of these nanoparticle compositions were investigated.
