Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 116, Issue 17, Pages 9734-9743Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp212505c
Keywords
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Funding
- National Nature Science Foundation of China [20973021]
- Nature Science Foundation of Beijing [2102031]
- 863 Program of National High Technology Research Development Project of China [2006AA11A189]
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Double-perovskite materials of composition Sr2Mg1-xCoxMoO6-delta (SMCMO, x = 0 to 0.7) were evaluated as potential SOFC anode materials. Their lattice structures, electrical and ionic conductivity, thermal expansion coefficient (TEC), and electrochemical performance were investigated as a function of Co content. Co doping was found to increase the TEC of the Sr2MgMoO6-delta material; however, the TEC was within the range of the commonly used La0.8Sr0.2Ga0.8Mg0.2O3-delta (LSGM) electrolyte. SMCMO also showed good chemical compatibility with the LSGM electrolyte at temperatures below 1300 degrees C. Both the electronic and ionic conductivity increased with increasing Co doping. To investigate the effect of Co doping on the conduction properties of SMCMO, we performed first-principle calculations. From these results, the weak Co-O bond is considered to be responsible for the enhanced ionic conductivity of SMCMO materials. The substitution of Co was also found to increase the sinterability of SMCMO, resulting in a decrease in the polarization resistance of the SMMO electrode. Single-cell tests indicated the potential ability of the Co-doped SMMO to be used as SOFC anodes.
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