Improving the efficiency of layered perovskite cathodes by microstructural optimization

摘要: Low-temperature solid oxide fuel cells require the use of cathodes with improved performance. In this context, microstructural optimization is fundamental in order to obtain more efficient and stable materials. However, most current fabrication techniques involve multiple steps therefore they are not suitable for industrial applications. This report describes alternative strategies prepare PrBaCo2O5+δ (PBC) by using a simple economic spray-pyrolysis deposition (SP) method. Three different electrode configurations have been tested: (i) PBC prepared on dense CGO pellets, (ii) deposited onto porous backbone layers (iii) submicrometric powders from freeze-dried precursors screen-printing process. The second approach an traditional wet infiltration method number advantages, such as shorter preparation time simplicity implementation at scale. Reduced values polarization resistance (Rp) obtained 600 °C, 0.027 Ω cm2 SP electrodes backbones, comparison 0.22 powder screen-printing. Moreover, demonstrate stability Rp 650 °C over time. A Ni–CGO anode-supported cell cathode achieves remarkable peak power density 0.95 W cm−2 0.6 screen-printed cathode.