Effect of Pd doping on the activity and stability of directly assembled La0.95Co0.19Fe0.76Pd0.05O3-δ cathodes of solid oxide fuel cells

摘要: Abstract Sr doping is a common strategy to enhance the electrocatalytic activity of perovskite cathode materials solid oxide fuel cells (SOFCs), but tendency surface segregation, chemical incompatibility with yttria-stabilized zirconia (YSZ) and interaction volatile contaminants such as chromium in SOFC stacks lead loss long-term cell performance. Herein, Sr-free Pd-doped La0.95Co0.19Fe0.76Pd0.05O3-δ (LCFPd) directly assembled on barrier-layer-free YSZ electrolyte without conventional high temperature pre-sintering. The LCFPd-GDC (gadolinium-doped ceria) composite exhibits peak power density 1035 mW cm− 2 excellent operation stability at 750 °C for 200 h. Cathodic polarization significantly enhances electrode/electrolyte interface contact, indicated by substantial decrease ohmic resistance from 0.28 Ω cm2 0.14 Ω cm2 after 500 mA cm− 2 120 h. Detailed elemental analysis indicates that doped Pd could be segregated electrode under conditions, which O2 reduction reaction. This study provides new develop cobaltite based electrolyte.