Synthesis and Oxygen Storage Capacity of Two‐Dimensional Ceria Nanocrystals

Wang, Dianyuan; Kang, Yijin; Doan-Nguyen, Vicky; Chen, Jun; Küngas, Rainer; Wieder, Noah L.; Bakhmutsky, Kevin; Gorte, Raymond J.; Murray, Christopher B.

doi:10.1002/anie.201101043

Cited by 174 publications

(104 citation statements)

References 54 publications

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“…The slabs were infiltrated with LSF to a weight loading of 35 wt% and calcined to 1123 K for 4 hours. The specific surface area of each infiltrated slab was determined from Brunauer-Emmett-Teller (BET) isotherms to be 1.75 m 2 /g using Kr adsorption at 77 K. 42 The weight of the infiltrated slabs was then measured as a function of the number of ALD cycles. These gravimetric measurements indicated that the Al 2 O 3 coverage increased linearly between 1 and 50 cycles, by 1.1 Al atoms/nm 2 per cycle.…”

Section: Methodsmentioning

confidence: 99%

An Investigation of Oxygen Reduction Kinetics in LSF Electrodes

Küngas

Levine

et al. 2012

J. Electrochem. Soc.

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The characteristics of solid oxide fuel cell (SOFC) cathodes, prepared by infiltration of La0.8Sr0.2FeO3−δ (LSF) into porous yttria-stabilized zirconia (YSZ) scaffolds, were evaluated by studying the effect of p(O2) and of Al2O3 overlayers deposited by Atomic Layer Deposition (ALD) on impedance spectra at 873 and 973 K. The electrode resistance of LSF-YSZ composites calcined at 1123 K was dominated by high-frequency processes that show a relatively weak p(O2) dependence of −0.2 at 973 K. Composites calcined to 1373 K exhibited additional, low-frequency features in their impedance spectra that were more strongly dependent on p(O2), −0.43. These low-frequency processes are due to O2 adsorption limitations caused by the lower surface area of the LSF phase. Decreases in the exposed LSF surface caused by ALD films caused similar changes in the impedance spectra. The ALD overlayers were disrupted by heating to 1073 K and electrode polarization at 873 K. The implications of these results for understanding O2 adsorption limitations on SOFC cathodes are discussed.

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Section: Methodsmentioning

confidence: 99%

An Investigation of Oxygen Reduction Kinetics in LSF Electrodes

Küngas

Levine

et al. 2012

J. Electrochem. Soc.

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“…Murray et al synthesized ultrathin 2D ceria nanoplates via a thermal decomposition method in the presence of mineralizers (sodium diphosphate) [73]. Many reaction parameters, such as precursor ratio, concentration, and reaction time, were varied to tune the morphology of nanoplates.…”

Section: Two-dimensional (2d) Nanostructuresmentioning

confidence: 99%

Rare Earth Based Anisotropic Nanomaterials: Synthesis, Assembly, and Applications

Yan

Sun

Zhang

et al. 2015

Anisotropic Nanomaterials

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Rare earths (RE) refer to the lanthanide elements La-Lu together with Sc and Y. Conventionally, they have found applications in phosphors, magnets, catalysts, fuel cell electrodes/electrolyte. Here in this chapter, we discuss the synthesis, assembly and applications of rare earth based anisotropic nanomaterials. Regarding synthesis, the anisotropic growth behaviors of these nanocrystals are predominantly governed by their own unique crystal structures. Yet for wet-chemistry synthetic methods where a number of parameters could be finely tuned, the addition of particular coordination agents, templating agents or mineralizers has proven to be an effective way to direct the growth of nanocrystals into some anisotropic structures. Regarding applications, anisotropic nanomaterials, compared to their isotropic counterparts, often exhibit distinct properties. For example, the luminescence of anisotropic nanomaterials can display polarization and site-specific features. As for rare earth nanomaterials as magnetic resonance imaging (MRI) contrast agents, the high surface area of anisotropic nanostructures can give rise to superior performances. And for catalysis applications, anisotropic nanomaterials expose rich, highly active facets, which is of great importance for facet-selective catalytic reactions. In the chapter, we will start with introduction of the crystal structures of rare earth compounds, then briefly summarize the synthesis and assembly of rare earth anisotropic nanomaterials, and discuss their properties and applications in three realms, namely, luminescence, magnetism and catalysis.

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“…323 Quite recently, CeO 2 nanoplates having a thickness of about 2 nm have been prepared by a facile solution-phase approach with the aid of mineralizers that accelerated the crystallization process and mediated the morphology of ceria nanocrystals. 324 The obtained CeO 2 nanoplates that are enclosed by six (100) facets had a much higher OSC. Hierarchical nanostructures such as arrays of nanorods, 325 flowery shapes, 326,327 nanospindles, 328 and hollow spheres [329][330][331] were synthesized by hydrothermal-like processes with the aid of complicated structure-directing agents.…”

Section: Multidimensional Ceo 2 Nanostructuresmentioning

confidence: 99%

“…336 More recently, ceria nanoplates with a thickness of 2 nm but different lateral dimensions have been successfully prepared by solution-phase synthesis using suitable mineralizers. 337 The OSC of these ceria nanoplates was three or four times greater than that of ceria nanospheres owing to the exposure of the reactive {100} planes, which facilitated the generation of oxygen vacancies.…”

Section: Ceo 2 Nanocatalystsmentioning

confidence: 99%

Tuning the Morphology of Metal Oxides for Catalytic Applications

Shen

2013

Nanocatalysis Synthesis and Applications

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Synthesis and Oxygen Storage Capacity of Two‐Dimensional Ceria Nanocrystals

Cited by 174 publications

References 54 publications

An Investigation of Oxygen Reduction Kinetics in LSF Electrodes

An Investigation of Oxygen Reduction Kinetics in LSF Electrodes

Rare Earth Based Anisotropic Nanomaterials: Synthesis, Assembly, and Applications

Tuning the Morphology of Metal Oxides for Catalytic Applications

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