Surface and redox chemistry of Sm0.95Ce0.05Fe1−xNixO3−δ perovskites

Bukhari, Syed M.; Giorgi, Javier B.

doi:10.1016/j.ssi.2011.05.008

Cited by 20 publications

(14 citation statements)

References 42 publications

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“…It was already reported that samarium oxide (Sm 2 O 3 ) is a good catalyst with high activation energy [18][19][20]. It was also confirmed that doping with Ni 3+ and Ce 3+ to SmFeO 3 resulted in a noticeable stability [21] with structure having orthorhombic symmetry with Pnma or Pbnm space groups [15,16,22,23]. The analyses of Sm 3+ doped materials [10] also showed that the conver-sion of the Sm 3+ to Sm 2+ species can happen at the same time as the oxidation.…”

Section: Introductionmentioning

confidence: 65%

“…FullProf software [36] was used to perform the Rietveld refinement of the XRD data. The least-square refinement was converged with the minimum goodness of fit (χ 2 ) and agreed with the literature data [16,17,21]. Scanning electron microscope (SEM-JSM-7610F) was used to investigate microstructure of the sintered samples.…”

Section: Characterizationmentioning

confidence: 93%

“…They exhibit high amount of oxygen vacancies and a good surface kinetics as well [24][25][26][27][28]. Moreover, Sm doped Fe 2 O 3 has proven to have a stable, good catalytic activity which can enhance performance as a gas sensor material in reduced atmosphere [21]. This easily leads to high electrical conductivity of the perovskite because of high electrochemical performance.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Zr addition on structure and electrical properties of SmFeO3 prepared by solid state reaction method

Abdalla

Hossain

Mohd

et al. 2017

PAC

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Series of Sm1-xFe1-3xZr3xO3 (SFZO, where x = 0.0, 0.01, 0.02, 0.033, 0.05, 0.1 and 0.15), was synthesised by the solid state reaction method and sintered at 1500?C in air. X-ray diffraction (XRD) and scanning electron microscopy (SEM) were used to investigate the structure of the materials. The XRD results indicated that the pure SmFeO3 and Sm0.99Fe0.97Zr0.03O3 samples are single phase materials with an orthorhombic symmetry and Pbnm space group. The increase of Zr content (x ? 0.02) causes a phase change from single to twophase system with orthorhombic (Pbnm) and fluorite symmetry (Fm?3m). The microstructural analyses showed that the Zr4+ doping resulted in an increase of porosity in the sintered SFZO compared to SmFeO3 sample. The direct current (DC) electrical conductivity at 850?C in air was found to be 0.045 S/cm and 0.007 S/cm for Sm0.99Fe0.97Zr0.03O3 and SmFeO3, respectively, showing a significant enhancement compared to the pure SmFeO3.

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Section: Introductionmentioning

confidence: 65%

Section: Characterizationmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

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Effect of Zr addition on structure and electrical properties of SmFeO3 prepared by solid state reaction method

Abdalla

Hossain

Mohd

et al. 2017

PAC

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“…10 A quick re-oxidation behaviour is very im-portant and desirable for many technological applications including sensors and SOFCs. This was not experimentally observed for this perovskite series.…”

Section: Resultsmentioning

confidence: 99%

“…[7][8][9][10][11] The resulting materials (Sm 0.95 Ce 0.05 Fe 1-x M x O 3-d , M¼ Ni, Co, x ¼ 0-0.10) have shown improvements in catalytic activity toward methane oxidation, and the ability to detect reducing gases at various temperatures. This was traditionally done by the incorporation of reactive transition metals.…”

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confidence: 99%

Redox Stability of Sm0.95Ce0.05Fe1-xCrxO3-δ Perovskite Materials

Bukhari

Giorgi

2011

J. Electrochem. Soc.

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This paper examines the relative REDOX stability and conductivity of new Cr-doped perovskite materials (Sm 0.95 Ce 0.05 Fe 1-x Cr x O 3-d , x ¼ 0-0.10) for potential use as anode materials and sensors for reducing gases at low temperatures. These perovskite materials were characterized by XRD, XPS and SEM. A reduction stability test revealed that these perovskites are stable at temperatures below 800 C under reducing conditions. The introduction of Cr in the lattice was found to be in the form of Cr þ3 and Cr þ6 . As a function of Cr content, the ratio of Cr þ3 /Cr þ6 was found to increase. The reduction treatment tended to decrease the concentration of lattice oxygen but the surface adsorbed oxygen was found to be higher in reduced samples as compared to fresh samples. This observation suggested that these materials have a tendency to recapture oxygen when exposed to air after the reduction treatment. The reduction treatment improved the electrical conductivity due to the formation of nanoparticles. The x ¼ 0.03 perovskite has highest electrical conductivity under both air and reducing atmospheres and shows the greatest promise for use in sensor applications for reducing gases at low temperatures.

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Total Oxidation of Volatile Organic Compounds

Pârvulescu

2015

Perovskites and Related Mixed Oxides

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Surface and redox chemistry of Sm0.95Ce0.05Fe1−xNixO3−δ perovskites

Cited by 20 publications

References 42 publications

Effect of Zr addition on structure and electrical properties of SmFeO3 prepared by solid state reaction method

Effect of Zr addition on structure and electrical properties of SmFeO3 prepared by solid state reaction method

Redox Stability of Sm0.95Ce0.05Fe1-xCrxO3-δ Perovskite Materials

Total Oxidation of Volatile Organic Compounds

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