Variation of structure and properties of La1−xSrxCo0.2Fe0.8O3−δ with Sr content: Implications for oxidation activity

Lakshminarayanan, Nandita; Kuhn, John N.; Choi, Hyunkyu; Millet, J.M.M.; Ozkan, Umit S.

doi:10.1016/j.molcata.2010.12.006

Cited by 3 publications

(1 citation statement)

References 37 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A feed mixture consisting of 4.5 % O 2 and 4.5 % CH 4 was used. Ni-YSZ cermet, which is the state-of-the art SOFC anode catalyst and La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3-d (LSCF6428) perovskite catalyst, which is shown to have considerable activity for methane oxidation in the literature [49] and also in our previous publications [50,51], were also used for comparison. The CH 4 and O 2 conversion data are presented for nine different temperatures in the temperature range of 400-800°C in Fig.…”

Section: Steady-state Methane Oxidationmentioning

confidence: 99%

Effect of Ce Doping on the Performance and Stability of Strontium Cobalt Ferrite Perovskites as SOFC Anode Catalysts

et al. 2015

Self Cite

View full text Add to dashboard Cite

The bulk structure, surface characteristics, catalytic properties, button cell performance, and stability of perovskite-type oxides with the formula Sr 1-x Ce xCo 0.2 Fe 0.8 O 3-d (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 10 h of operation under 50 ppm H 2 S. 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. Sr 1-x Ce x Co 0.2 Fe 0.8 O 3-d (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.

show abstract

Section: Steady-state Methane Oxidationmentioning

confidence: 99%