期刊
ACS APPLIED MATERIALS & INTERFACES
卷 9, 期 3, 页码 2326-2333出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b12606
关键词
IT-SOFC; cathode; CO2 poisoning; ORR; stability
资金
- Australian Research Council [DP130102151]
- Queensland Smart Futures Fund, Research Partnerships Program
- China Scholarship Council
- State Key Laboratory of Material-oriented Chemical Engineering [KL15-04]
Susceptibility to CO2 is one of the major challenges for the long-term stability of the alkaline-earth-containing cathodes for intermediate-temperature solid oxide fuel cells. To alleviate the adverse effects from CO2, we incorporated samarium-stabilized ceria (SDC) into a SrCo0.85Ta0.15O3-delta (SCT15) cathode by either mechanical mixing or a wet impregnation method and evaluated their cathode performance stability in the presence of a gas mixture of 10% CO2, 21% O-2, and 69% N-2. We observed that the CO2 tolerance of the hybrid cathode outperforms the pure SCT15 cathode by over 5 times at 550 degrees C. This significant enhancement is likely attributable to the low CO2 adsorption and reactivity of the SDC protective layer, which are demonstrated through thermogravimetric analysis, energy-dispersive spectroscopy, and electrical conductivity study.
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