caa a22 4500 606174060 CHVBK 20210128100736.0 cr unu---uuuuu 210128e20150401xx s 000 0 eng 10.1007/s11244-015-0377-x doi (NATIONALLICENCE)springer-10.1007/s11244-015-0377-x Effect of Ce Doping on the Performance and Stability of Strontium Cobalt Ferrite Perovskites as SOFC Anode Catalysts [Elektronische Daten] [Hyunkyu Choi, Anshuman Fuller, Doruk Dogu, Katja Binkley, Jonathan Davis, Anne Co, Umit Ozkan] The bulk structure, surface characteristics, catalytic properties, button cell performance, and stability of perovskite-type oxides with the formula Sr1−xCexCo0.2Fe0.8O3−δ (x=0.10, 0.15, and 0.20) were investigated as potential anode electro-catalysts for solid oxide fuel cells. In situ X-ray diffraction results indicated that the structural stability of the cerium-doped perovskites was enhanced with increasing cerium concentration. The catalysts with lower cerium concentration transformed from the initial cubic structure to a lower symmetry structure at high temperatures in a reducing environment. All the catalysts, however, were restored to the original cubic structure after re-oxidation. Electronic conductivity tests showed that the cerium-doped samples break down at higher temperatures, but display potential in terms of structural integrity and high conductivity at temperatures lower than 600°C. The new materials showed better performance than Ni-YSZ in catalytic methane oxidation tests. The sulfur tolerance is significantly enhanced with the cerium-doped perovskites, showing no deactivation for up to 10h of operation under 50ppm H2S. X-ray photoelectron spectroscopy analysis on the poisoned samples suggests that the sulfur may exist on the surface primarily as strontium sulfate. The sample with a cerium loading of 15% (x=0.15) showed a particularly high sulfur tolerance during chronoamperometry tests and its button cell performance matched well with that of Ni-YSZ anode. Sr1−xCexCo0.2Fe0.8O3−δ (x=0.10, 0.15, and 0.20) samples may have potential for low or intermediate temperature SOFC operation in which sulfur-containing hydrocarbon fuels are used, although they would not be stable at higher temperatures. Springer Science+Business Media New York, 2015 SOFC nationallicence Perovskite nationallicence Anode nationallicence Sulfur poisoning nationallicence Cerium nationallicence Impedance nationallicence Choi Hyunkyu William G. Lowrie Department of Chemical and Biomolecular Engineering, The Ohio State University, Columbus, USA aut Fuller Anshuman William G. Lowrie Department of Chemical and Biomolecular Engineering, The Ohio State University, Columbus, USA aut Dogu Doruk William G. Lowrie Department of Chemical and Biomolecular Engineering, The Ohio State University, Columbus, USA aut Binkley Katja William G. Lowrie Department of Chemical and Biomolecular Engineering, The Ohio State University, Columbus, USA aut Davis Jonathan William G. Lowrie Department of Chemical and Biomolecular Engineering, The Ohio State University, Columbus, USA aut Co Anne Department of Chemistry and Biochemistry, The Ohio State University, 43210, Columbus, OH, USA aut Ozkan Umit William G. Lowrie Department of Chemical and Biomolecular Engineering, The Ohio State University, Columbus, USA aut Topics in Catalysis Springer US; http://www.springer-ny.com 58/4-6(2015-04-01), 359-374 1022-5528 58:4-6<359 2015 58 11244 https://doi.org/10.1007/s11244-015-0377-x text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s11244-015-0377-x text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Choi Hyunkyu William G. Lowrie Department of Chemical and Biomolecular Engineering, The Ohio State University, Columbus, USA aut NATIONALLICENCE 700 1- Fuller Anshuman William G. Lowrie Department of Chemical and Biomolecular Engineering, The Ohio State University, Columbus, USA aut NATIONALLICENCE 700 1- Dogu Doruk William G. Lowrie Department of Chemical and Biomolecular Engineering, The Ohio State University, Columbus, USA aut NATIONALLICENCE 700 1- Binkley Katja William G. Lowrie Department of Chemical and Biomolecular Engineering, The Ohio State University, Columbus, USA aut NATIONALLICENCE 700 1- Davis Jonathan William G. Lowrie Department of Chemical and Biomolecular Engineering, The Ohio State University, Columbus, USA aut NATIONALLICENCE 700 1- Co Anne Department of Chemistry and Biochemistry, The Ohio State University, 43210, Columbus, OH, USA aut NATIONALLICENCE 700 1- Ozkan Umit William G. Lowrie Department of Chemical and Biomolecular Engineering, The Ohio State University, Columbus, USA aut NATIONALLICENCE 773 0- Topics in Catalysis Springer US; http://www.springer-ny.com 58/4-6(2015-04-01), 359-374 1022-5528 58:4-6<359 2015 58 11244