Doped LaFeO3 as SOFC catalysts: Control of oxygen mobility and oxidation activity

Lakshminarayanan, Nandita; Kuhn, John N.; Rykov, S. A.; Millet, J.M.M.; Ozkan, Umit S.

doi:10.1016/j.cattod.2010.03.037

Cited by 28 publications

(15 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For perovskite, the electronic conductivity and the surface composition have been taken as the most significant properties for its performance as the anode in SOFCs [3,10,11]. Ozkan et al found that the activity of La 0.6 Sr 0.4 FeO 3 was strongly influenced by doping Co in it [12]. Bossche and Mclntosh reported that the doping of Co and Ni in La 0.75 Sr 0.25 Cr 0.5 Mn 0.4 X 0.1 O 3−ı (X = Co, Fe and Ni) enhanced the activity, while the doping of Fe had a negative effect [13].…”

Section: Introductionmentioning

confidence: 99%

Sr2Fe2−Mo O6− perovskite as an anode in a solid oxide fuel cell: Effect of the substitution ratio

Zhao

Wang

et al. 2016

Catalysis Today

View full text Add to dashboard Cite

Section: Introductionmentioning

confidence: 99%

Sr2Fe2−Mo O6− perovskite as an anode in a solid oxide fuel cell: Effect of the substitution ratio

Zhao

Wang

et al. 2016

Catalysis Today

View full text Add to dashboard Cite

“…As it is or doped with alkaline ions, it can be easily and conveniently used as photocatalyst, 24 since it absorbs the light in the VIS range with a proved photoactivity in dyes decomposition, resulting even better than TiO 2 Degussa P25 oxide. 10,25 In most cases, the assessment of material goodness is simply made using the material in an applicative process, 11,26 or following the degradation of the materials via Temperature Programmed Reduction (TPR), Oxidation (TPO), Desorption (TPD) and O 2 -pulse measurements. 10,25 In most cases, the assessment of material goodness is simply made using the material in an applicative process, 11,26 or following the degradation of the materials via Temperature Programmed Reduction (TPR), Oxidation (TPO), Desorption (TPD) and O 2 -pulse measurements.…”

Section: Introductionmentioning

confidence: 99%

“…10,25 In most cases, the assessment of material goodness is simply made using the material in an applicative process, 11,26 or following the degradation of the materials via Temperature Programmed Reduction (TPR), Oxidation (TPO), Desorption (TPD) and O 2 -pulse measurements. Other methods used to investigate qualitatively or quantitatively the oxygen availability of perovskite-type materials include X-ray photoelectron spectroscopy, 29,30 secondary ion mass spectrometry, isothermal isotope exchange 31 and oxygen isotopic exchange 28 for the surface oxygen, and thermogravimetric analyses, 10,11,32 diffuse reectance FTIR spectroscopy, 33 near edge X-ray absorption ne structure 11 and oxygen isotopic exchange 28 for the bulk oxygen. Other methods used to investigate qualitatively or quantitatively the oxygen availability of perovskite-type materials include X-ray photoelectron spectroscopy, 29,30 secondary ion mass spectrometry, isothermal isotope exchange 31 and oxygen isotopic exchange 28 for the surface oxygen, and thermogravimetric analyses, 10,11,32 diffuse reectance FTIR spectroscopy, 33 near edge X-ray absorption ne structure 11 and oxygen isotopic exchange 28 for the bulk oxygen.…”

Section: Introductionmentioning

confidence: 99%

A new in situ methodology for the quantification of the oxygen storage potential in perovskite-type materials

et al. 2013

View full text Add to dashboard Cite

A well known perovskite-type material, LaFeO 3 , was prepared by citrate-nitrate auto-combustion synthesis and used to formulate a new in situ approach for the analytical evaluation of the redox properties of this class of material. Carbon monoxide was used as a reducing agent-probe, while molecular oxygen was used as an oxidizing agent-probe. In situ FTIR spectroscopy was applied for a qualitative characterization of the interaction probe-material, and microgravimetry was used in order to quantify the extent of the interaction. The results obtained indicated that simple molecules, such as CO and O 2 , are able to define the redox properties of the material without inducing any important modification as in the case of the more classical temperature-programmed reduction and oxidation methods. The described procedure can be successfully applied for the evaluation of the oxygen mobility/availability and storage potential of other perovskite-type materials.

show abstract

“…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

Doped LaFeO3 as SOFC catalysts: Control of oxygen mobility and oxidation activity

Cited by 28 publications

References 29 publications

Sr2Fe2−Mo O6− perovskite as an anode in a solid oxide fuel cell: Effect of the substitution ratio

Sr2Fe2−Mo O6− perovskite as an anode in a solid oxide fuel cell: Effect of the substitution ratio

A new in situ methodology for the quantification of the oxygen storage potential in perovskite-type materials

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

Contact Info

Product

Resources

About