Effect of Pd doping on the activity and stability of directly assembled La0.95Co0.19Fe0.76Pd0.05O3-? cathodes of solid oxide fuel cells
By Li, Na; Ai, Na; He, Shuai; Cheng, Yi; Rickard, William D. A.; Chen, Kongfa; Zhang, Teng; Jiang, San Ping
Published in Solid State Ionics
2018
Abstract
Sr doping is a common strategy to enhance the electrocatalytic activity of perovskite cathode materials of solid oxide fuel cells (SOFCs), but the tendency of Sr surface segregation, chemical incompatibility with yttria-stabilized zirconia (YSZ) and interaction with volatile contaminants such as chromium in {SOFC} stacks lead to a loss of long-term cell performance. Herein, a Sr-free and Pd-doped La0.95Co0.19Fe0.76Pd0.05O3-? (LCFPd) cathode is directly assembled on a barrier-layer-free {YSZ} electrolyte cell without conventional high temperature pre-sintering. The cell with the directly assembled LCFPd-GDC (gadolinium-doped ceria) composite cathode exhibits a peak power density of 1035 mW cm? 2 and excellent operation stability at 750