Method of manufacturing nanolayered cathodes for solid oxide fuel cell using ultrasonic spray infiltration and solid oxide fuel cell manufactured using same
Disclosed is a method of manufacturing a cathode for a solid oxide fuel cell (SOFC) including preparing an electrode composition containing urea, ultrasonically spraying the electrode composition onto a GDC scaffold, and drying the scaffold. By using urea, calcination (≥700° C.) after each infiltration cycle can be omitted, the next infiltration cycle is performed immediately after the drying (≤100° C.), and thus the cathode manufacturing process time can be greatly reduced. Disclosed is also a solid oxide fuel cell including an anode support, an anode functional layer disposed on the anode support, an electrolyte disposed on the anode functional layer, and a cathode disposed on the electrolyte, wherein the cathode is formed by ultrasonic spraying using an electrode composition containing urea.
1 . A method of manufacturing a cathode for a solid oxide fuel cell (SOFC) comprising:
preparing an electrode composition containing urea and a precursor of La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3 (LSCF),
wherein a molar ratio of urea to the precursor of La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3 (LSCF) is 10:1 to 15:1;
ultrasonically spraying the electrode composition onto a gadolinium-doped ceria (GDC) scaffold; and
drying the scaffold.
2 . The method according to claim 1 , wherein the ultrasonically spraying comprises infiltration of the electrode composition using ultrasonic spraying.
3 . The method according to claim 1 , wherein the drying is performed at a temperature lower than 100° C.
4 . The method according to claim 1 , wherein the infiltration is performed from 3 to 5 cycles.
5 . The method according to claim 4 , wherein a single calcination is performed after the last infiltration cycle.
6 . The method according to claim 5 , wherein the single calcination is performed at ≤900° C.
7 . The method according to claim 5 , wherein the single calcination is performed at 800-900° C. for 2 to 3 hours.