Determining the maximum lanthanum incorporation in the fluorite structure of La-doped ceria nanocubes for enhanced redox ability

Loche, Danilo; Morgan, Lucy M.; Casu, Alberto; Mountjoy, Gavin; O’Regan, Colm; Corrias, Anna; Falqui, Andrea

doi:10.1039/c8ra09766f

Cited by 20 publications

(27 citation statements)

References 26 publications

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“…For low doping levels (x = 0.20), the cube-shaped nanoparticles grow forming larger cubes and consuming the rod-like nanoparticles. This overall comparison indicates that the use of a higher concentration of La nitrate in the synthesis has an effect of retardation in the growth, and similar effects were observed by Loche et al 26…”

Section: Discussionsupporting

confidence: 87%

“…Loche et al achieved 12% of La-doping ceria nanocubes by adding a capping agent. 26 Jiang et al found a mixture of nanocubes and nanorods for Pr 3+ doping higher than 15% without template addition. 27 In the present study, a systematic investigation of ceria nanoparticles doped with lanthanum prepared by the hydrothermal method was performed.…”

Section: Introductionmentioning

confidence: 99%

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Tuning of Shape, Defects, and Disorder in Lanthanum-Doped Ceria Nanoparticles: Implications for High-Temperature Catalysis

Trindade

Damasceno

Otubo

et al. 2022

ACS Appl. Nano Mater.

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The design of nanomaterials by tailoring the size, shape, and surface chemistry has a significant impact on their properties. The fine-tuning of structural defects of ceria rod-like and cube-like-shaped nanoparticles was performed via La3+ doping in molar ratios of 0–70 mol %. Morphology control was achieved by varying the hydrothermal synthesis temperature. For La x Ce1–x O2–x/2 samples prepared at 110 °C, nanorod-like structures are obtained for x < 0.30 and a random morphology of interconnecting polyhedra is achieved for a larger x. The ceria fluorite crystalline structure is maintained at an x of up to 0.60, and both Raman and X-ray diffraction results indicate a high level of defects and disorder in the crystalline structure. For La x Ce1–x O2–x/2 samples prepared at 180 °C, cube-shaped particles are predominant for an x of up to 0.10; however, for x > 0.20, two fluorite phases with different lattice parameters are associated with two distinct shapes, cubes and rods The La concentration in nanocubes is limited to x = 0.10 even for samples prepared with higher nominal La concentrations, whereas the nanorods contain larger La concentrations. The demonstrated morphology and defect control on La-doped ceria nanoparticles are critical for applications such as high-temperature oxide catalysts.

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Section: Discussionsupporting

confidence: 87%

Section: Introductionmentioning

confidence: 99%

Tuning of Shape, Defects, and Disorder in Lanthanum-Doped Ceria Nanoparticles: Implications for High-Temperature Catalysis

Trindade

Damasceno

Otubo

et al. 2022

ACS Appl. Nano Mater.

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“…From these characterization techniques, the cubic shape and d -spacing confirm the material authenticity, homogeneous distribution of La, and amounts of La. 100 …”

Section: Characterization Techniquesmentioning

confidence: 57%

Insights into ZnO-based doped porous nanocrystal frameworks

Abebe

Murthy

2022

RSC Adv.

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“…The obtained %Ce 3+ were 7.8% and 12.9% for the reference SDC and the tested area, respectively. Several studies showed that lanthanum incorporation into the ceria structure promotes the reduction of Ce 4+ into Ce 3+ [55,56]. Thus, the higher concentration of Ce 3+ in the tested area can be attributed to lanthanum incorporation into the ceria structure.…”

Section: Structural and Surface Chemistry Analysismentioning

confidence: 96%

Chemical Degradation of the La0.6Sr0.4Co0.2Fe0.8O3−δ/Ce0.8Sm0.2O2−δ Interface during Sintering and Cell Operation

et al. 2021

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A complete cell consisting of NiO-Ce0.8Sm0.2O3−δ//Ce0.8Sm0.2O3−δ//(La0.6Sr0.4)0.95Co0.2Fe0.8O3−δ elaborated by a co-tape casting and co-sintering process and tested in operating fuel cell conditions exhibited a strong degradation in performance over time. Study of the cathode–electrolyte interface after cell testing showed, on one hand, the diffusion of lanthanum from (La0.6Sr0.4)0.95Co0.2Fe0.8O3−δ into Sm-doped ceria leading to a La- and Sm-doped ceria phase. On the other hand, Ce and Sm diffused into the perovskite phase of the cathode. The grain boundaries appear to be the preferred pathways of the cation diffusion. Furthermore, a strontium enrichment was clearly observed both in the (La0.6Sr0.4)0.95Co0.2Fe0.8O3−δ layer and at the interface with electrolyte. X-ray photoelectron spectroscopy (XPS) indicates that this Sr-rich phase corresponded to SrCO3. These different phenomena led to a chemical degradation of materials and interfaces, explaining the decrease in electrochemical performance.

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Determining the maximum lanthanum incorporation in the fluorite structure of La-doped ceria nanocubes for enhanced redox ability

Abstract: Ceria nanocubes have been doped with increasing amounts of lanthanum to enhance their redox ability.

Cited by 20 publications

References 26 publications

Tuning of Shape, Defects, and Disorder in Lanthanum-Doped Ceria Nanoparticles: Implications for High-Temperature Catalysis

Tuning of Shape, Defects, and Disorder in Lanthanum-Doped Ceria Nanoparticles: Implications for High-Temperature Catalysis

Insights into ZnO-based doped porous nanocrystal frameworks

Chemical Degradation of the La0.6Sr0.4Co0.2Fe0.8O3−δ/Ce0.8Sm0.2O2−δ Interface during Sintering and Cell Operation

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