文摘
Susceptibility to COb>2b> 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 COb>2b>, we incorporated samarium-stabilized ceria (SDC) into a SrCob>0.85b>Tab>0.15b>Ob>3−δb> (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% COb>2b>, 21% Ob>2b>, and 69% Nb>2b>. We observed that the COb>2b> tolerance of the hybrid cathode outperforms the pure SCT15 cathode by over 5 times at 550 °C. This significant enhancement is likely attributable to the low COb>2b> adsorption and reactivity of the SDC protective layer, which are demonstrated through thermogravimetric analysis, energy-dispersive spectroscopy, and electrical conductivity study.