title: Highly CO2-Tolerant Cathode for Intermediate-Temperature Solid Oxide Fuel Cells: Samarium-Doped Ceria-Protected SrCo0.85Ta0.15O3-δHybrid.
abstract: Susceptibility to CO2is 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-δ(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% O2, and 69% N2. We observed that the CO2tolerance 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 CO2adsorption and reactivity of the SDC protective layer, which are demonstrated through thermogravimetric analysis, energy-dispersive spectroscopy, and electrical conductivity study.
authors.affiliation: School of Chemical Engineering, The University of Queensland , St. Lucia, Queensland 4072, Australia.
authors.forename: Mengran
authors.initials: M
authors.lastname: Li
authors.affiliation: Jiangsu National Synergetic Innovation Center for Advanced Materials, State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University , No. 5 Xin Mofan Road, Nanjing 210009, P. R. China.
authors.forename: Wei
authors.initials: W
authors.lastname: Zhou
authors.affiliation: School of Chemical Engineering, The University of Queensland , St. Lucia, Queensland 4072, Australia.
authors.forename: Zhonghua
authors.identifier: http://orcid.org/0000-0003-2144-8093
authors.initials: Z
authors.lastname: Zhu
keywords: CO2 poisoning; IT-SOFC; ORR; cathode; stability