A double-layer composite electrode based on SrSc0.2Co0.8O3-d perovskite with improved performance in intermediate temperature solid oxide fuel cells
MetadataShow full item record
Dual-layer composite electrodes consisting of a layer adjoining to an Sm0.2Ce0.8O1.9 (SDC) electrolyte composed of 70 wt.% SrSc0.2Co0.8O3-d + 30 wt.% Sm0.2Ce0.8O1.9 (SScC + SDC composite) and a second layer composed of 70 wt.% SrSc0.2Co0.8O3-d + 30 wt.% Sm0.5Sr0.5CoO3-d (SScC + SmSC composite) were fabricated and investigated as potential cathodes in intermediate temperature solid-oxide fuel cells. Thermo-mechanical compatibility between the two electrode layers and between the electrode and the electrolyte were examined by SEM, XRD and EIS. After sintering, no clear boundary between SScC + SDC and SScC + SmSC layers was observable by SEM. The repeated thermal cycling didn't induce the delamination of the electrode from the electrolyte nor the formation of cracks within the electrode. As a result, stable electrode performance was achieved during thermal cycling and long-term operation. Symmetric cell tests demonstrated that the dual-layer electrode with a ~10-µm SScC + SDC layer and a ~50-µm SScC + SmSC layer (SScC + SDC/SScC + SmSC (1:5)) had the lowest electrode-polarization resistance among those tested. Anode-supported fuel cells with an SDC electrolyte and SScC + SDC/SScC + SmSC (1:5) cathode were fabricated. Peak power density as high as 1326 mW cm-2 was achieved at 650 °C, which was higher than for similar fuel cells with a single-layer SScC + SDC or an SScC + SmSC composite electrode. © 2010 Professor T. Nejat Veziroglu.
Showing items related by title, author, creator and subject.
Highly Stable Sr-Free Cobaltite-Based Perovskite Cathodes Directly Assembled on a Barrier-Layer-Free Y2O3-ZrO2 Electrolyte of Solid Oxide Fuel CellsAi, Na; Li, N.; Rickard, William; Cheng, Yi; Chen, Kongfa; Jiang, San Ping (2017)Direct assembly is a newly developed technique in which a cobaltite-based perovskite (CBP) cathode can be directly applied to a barrier-layer-free Y2O3-ZrO2 (YSZ) electrolyte with no high-temperature pre-sintering steps. ...
Polarization-Induced Interface and Sr Segregation of in Situ Assembled La0.6Sr0.4Co0.2Fe0.8O3−δ Electrodes on Y2O3–ZrO2 Electrolyte of Solid Oxide Fuel CellsChen, K.; Li, N.; Ai, N.; Cheng, Yi; Rickard, W.; Jiang, S. (2016)© 2016 American Chemical Society.Application of cobaltite-based electrodes such as La0.6Sr0.4Co0.2Fe0.8O3-d (LSCF) on Y2O3-ZrO2 (YSZ) electrolyte in solid oxide fuel cells (SOFCs) generally requires the use of a doped ...
Effect of Pd doping on the activity and stability of directly assembled La0.95Co0.19Fe0.76Pd0.05O3-δ cathodes of solid oxide fuel cellsLi, N.; Ai, N.; He, S.; Cheng, Y.; Rickard, William; Chen, K.; Zhang, T.; Jiang, S. (2018)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 ...