Nb and Pd co-doped La<inf>0.57</inf>Sr<inf>0.38</inf>Co<inf>0.19</inf>Fe<inf>0.665</inf>Nb<inf>0.095</inf>Pd<inf>0.05</inf>O<inf>3-d</inf>as a stable, high performance electrode for barrier-layer-free Y<inf>2</inf>O<inf>3</inf>-ZrO<inf>2</inf>electrolyte of solid oxide fuel cells
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© 2017 Elsevier B.V. La 0.6 Sr 0.2 Co 0.2 Fe 0.8 O 3-d (LSCF) is the most intensively investigated high performance cathode for intermediate temperature solid oxide fuel cells (IT-SOFCs), but strontium segregation and migration at the electrode/electrolyte interface is a critical issue limiting the electrocatalytic activity and stability of LSCF based cathodes. Herein, we report a Nb and Pd co-doped LSCF (La 0.57 Sr 0.38 Co 0.19 Fe 0.665 Nb 0.095 Pd 0.05 O 3-d , LSCFNPd) perovskite as stable and active cathode on a barrier-layer-free anode-supported yttria-stabilized zirconia (YSZ) electrolyte cell using direct assembly method without pre-sintering at high temperatures. The cell exhibits a peak power density of 1.3 W cm -2 at 750 °C and excellent stability with no degradation during polarization at 500 mA cm -2 and 750 °C for 175 h. Microscopic and spectroscopic analysis show that the electrochemical polarization promotes the formation of electrode/electrolyte interface in operando and exsolution of Pd/PdO nanoparticles. The Nb doping in the B-site of LSCF significantly reduces the Sr surface segregation, enhancing the stability of the cathode, while the exsoluted Pd/PdO nanoparticles increases the electrocatalytic activity for the oxygen reduction reaction. The present study opens up a new route for the development of cobaltite-based perovskite cathodes with high activity and stability for barrier-layer-free YSZ electrolyte based IT-SOFCs.
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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 ...
Performance stability and degradation mechanism of La0.6Sr0.4Co0.2Fe0.8O3-δ cathodes under solid oxide fuel cells operation conditionsLiu, Y.; Chen, Kongfa; Zhao, Ling; Chi, B.; Pu, J.; Jiang, San Ping (2014)The performance stability and degradation mechanism of La0.6Sr0.4Co0.2Fe0.8O3d (LSCF)cathodes and LSCF impregnated Gd0.1Ce0.9O2d (LSCF-GDC) cathodes are investigated undersolid oxide fuel cell operation conditions. LSCF ...
A FIB-STEM Study of Strontium Segregation and Interface Formation of Directly Assembled La0.6Sr0.4Co0.2Fe0.8O3.delta Cathode on Y2O3-ZrO2 Electrolyte of Solid Oxide Fuel CellsHe, Shuai; Saunders, M.; Chen, K.; Gao, H.; Suvorova, A.; Rickard, William; Quadir, Zakaria; Cui, C.; Jiang, San Ping (2018)Electrode/electrolyte interface plays a critical role in the performance and stability of solid oxide fuel cells (SOFCs). Here, interface formation, Sr segregation and reaction of directly assembled La0.6Sr0.4Co0.2Fe0.8O3-δ ...