Journal
JOURNAL OF POWER SOURCES
Volume 195, Issue 16, Pages 5176-5184Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2010.02.080
Keywords
Perovskite; Cathode; Solid-oxide fuel cells; Mixed conductors
Funding
- National Natural Science Foundation of China [20676061, 20703024]
- National 863 Program [2007AA05Z133]
- National Basic Research Program of China [2007CB209704]
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A perovskite-type Ba0.6Sr0.4Co0.9Nb0.1O3-delta (BSCN) oxide is investigated as the cathode material of oxygen-ionic solid-oxide fuel cells (SOFCs) with Sm0.2Ce0.8O3-delta (SDC) electrolyte. Powder X-ray diffraction and SEM characterization demonstrate that solid phase reactions between BSCN and SDC are negligible at temperatures up to 1100 degrees C. The results of thermal-expansion and electrical conductivity measurements indicate the introduction of Ba2+ into the A-site of SrCo0.9N0.1O3-delta (SCN) led to a decrease in the thermal-expansion coefficient (TEC) and electrical conductivity of the compound. A TEC of 14.4 x 10(-6) K-1 is observed for BSCN within a temperature range of 200-500 degrees C. The chemical diffusion coefficient (D-chem) and surface exchange constant (k(ex)) of BSCN and SCN are obtained using an electrical conductivity relaxation technique and BSCN prove to have higher D-chem and k(ex) than SCN. An area-specific resistance of 0.1 Omega cm(-2) is achieved for BSCN cathodes at 600 degrees C based on symmetric cells test. Peak power density of similar to 1150 mW cm(-2) is reached for a thin-film electrolyte cell with BSCN cathode at 600 degrees C, which is higher than a similar cell with SCN cathode (similar to 1008 mW cm(-2)). BSCN is a promising cathode material for oxygen-ionic IT-SOFCs. (C) 2010 Elsevier B.V. All rights reserved.
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