Microstructure and performance of La0.58Sr0.4CO0.2Fe0.8O3-delta cathodes deposited on BaCe0.2Zr0.7Y0.1O3-delta by infiltration and spray pyrolysis

作者：Ricote Sandrine^*; Bonanos Nikolaos; Rorvik Per Martin; Haavik Camilla

来源：Journal of Power Sources, 2012, 209: 172-179.

DOI：10.1016/j.jpowsour.2012.02.090

• BCZY
• LSCF
• PCFC
• Spray pyrolysis
• Cathode material
• Infiltration

La0.58Sr0.4CO0.2Fe0.8O3-delta (LSCF) cathodes have been deposited on proton-conducting BaCe0.2Zr0.7Y0.1O3-delta (BCZY27) electrolyte and studied in symmetric cells to investigate the cathode microstructure and electrochemical performance. Three different types of cathodes have been prepared: two prepared from a solution, infiltrated into a screen-printed BZCY27 porous backbone (4 and 12 infiltrations), and one prepared by spray pyrolysis onto a polished electrolyte. In all three cases, LSCF is obtained after annealing at 700 degrees C for 2 h. Analysis of the electrochemical impedance spectra between 450 degrees C and 600 degrees C in air, with varying p(H2O), reveals that the charge transfer contribution is the lowest for the backbone-infiltrated cathode while the oxygen dissociation/adsorption contribution is the lowest for the spray-pyrolyzed cathode. The area specific resistances increase with the water vapor pressure. The area specific resistances obtained are 0.61 Omega cm(2) and 0.89 Omega cm(2) at 600 degrees C for the spray-pyrolyzed LSCF cell in dry and humidified air, respectively: the corresponding resistances are 0.63 Omega cm(2) and 0.98 Omega cm(2) for the 12 times infiltrated LSCF cell. These resistances are the lowest reported for LSCF cathodes on Ba(Ce,Zr)O-3-based electrolytes and show the promise of low-temperature fabrication methods for these systems.

• 出版日期2012-7-1