Electrophoretic deposition of La_(0.6)Sr_(0.4)Co_(0.8)Fe_(0.2)O_(3 - delta) cathodes on Ce_(0.9)Gd_(0.1)O_(1.95) substrates for intermediate temperature solid oxide fuel cell (IT-SOFC)

摘要

Porous thick films of La_(0.6)Sr_(0.4)Co_(0.8)Fe_(0.2)O_(3 - delta) (LSCF) on Ce_(0.9)Gd_(0.1)O_(1.95) (CGO) substrates were prepared by the electrophoretic deposition (EPD) method. Organic suspensions of different compositions containing LSCF ceramic particles were investigated with the aim to determine the optimal composition of the suspension and EPD conditions. Stainless steel substrates were used in order to determine the optimal parameters for the EPD process. The best results were achieved with solutions containing acetylacetone, iodine and starch. The EPD conditions leading to uniform LSCF films were: applied voltage 20 V and deposition time 120 s, with the electrodes separated 1.5 cm. EPD was also demonstrated to be a simple and useful method for making porous LSCF cathodes on CGO substrates. It was shown that the microstructure of the films can be controlled by changing the applied voltage, deposition time and concentration of additives in suspension.