Synthesis and physicochemical properties of La(OH)3 and La2O3 nanostructures

Kang, Jun‐Gill; Kim, Young Il; Cho, Dae Won; Sohn, Youngku

doi:10.1016/j.mssp.2015.07.050

Cited by 94 publications

(43 citation statements)

References 50 publications

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“…The lattice fringes inset in Fig. 3f illustrate two interplanar spacing values, i.e., 0.31 and 0.34 nm, which are consistent with the (111), (110) planes of the CeO 2 and La 2 O 3 , respectively [3, 15, 43]. It revealed that the La 3+ ions have been effectively generated into La 2 O 3 , which is consistent with the XRD spectrum.…”

Section: Resultssupporting

confidence: 73%

Synthesis and CO Oxidation Activity of 1D Mixed Binary Oxide CeO2-LaO x Supported Gold Catalysts

Zhong

Zhu

et al. 2017

Nanoscale Res Lett

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One-dimensional (1D) Ce-La nanorods with different La contents (Ce and La in the molar ratio of 1:0, 3:1, 1:1, 1:3, and 0:1) were synthesized by hydrothermal process. Au/Ce-La nanorod catalysts were obtained by a modified deposition-precipitation method. The samples were characterized by N2 adsorption-desorption (BET), ICP, X-ray diffraction (XRD), SEM, TEM, EDX, X-ray photoelectron spectroscopy (XPS), UV-vis diffuse reflectance spectroscopy (UV-vis DRS), and temperature-programmed reduction (H2-TPR). It revealed that La existed as LaOx in the 1D nanorods. The catalysis results demonstrated that the mixed binary Ce-La nanorod oxides could be a good support for gold catalysts. The contents of La had an important influence on the catalytic performance of Au/Ce-La nanorod catalysts. Among the catalysts, when the Ce/La molar ratio was 3:1, the 1.0%Au/Ce0.75-La0.25 nanorods pretreated at 300 °C showed the best activity among the catalysts for CO oxidation, which could convert CO completely at 30 °C. The catalysts also performed high temperature resistance and good stability for CO oxidation at the reaction temperatures of 40, 70, and 200 °C.

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Section: Resultssupporting

confidence: 73%

Synthesis and CO Oxidation Activity of 1D Mixed Binary Oxide CeO2-LaO x Supported Gold Catalysts

Zhong

Zhu

et al. 2017

Nanoscale Res Lett

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“…In addition, the O 1s peaks at 532.5 and 530.5 eV could be assigned to the La-O bond in the La 2 O 3 phase ( Fig. 1i) [28,43], further evidencing that the composition of La 2 O 3 @NP-NS was La 2 O 3 . By comparing the XPS results before and after Ar annealing, no obvious change was found for both La peaks and O peaks, suggesting both nanosheet and NPs had the same La 2 O 3 chemistry.…”

Section: Resultsmentioning

confidence: 81%

“…Recently, rare-earth metal-based materials, especially rare-earth metal oxides, are found promising for a wide range of catalytic applications, including steam methane reforming, photocatalysis, water-gas shift reactions, thermochemical water splitting, and organocatalytic reactions [27]. Among them, La 2 O 3 is showing a great potential as an alternative electrocatalytic candidate owing to its multiple oxidation states, excellent chemical stability, and low toxicity [27][28][29]. However, the electrochemical catalytic performance of commercial La 2 O 3 powders is far from satisfaction mainly because of their low ratio of active catalytic sites and poor conductivity [5,30].…”

Section: Introductionmentioning

confidence: 99%

Nanoparticle-Decorated Ultrathin La2O3 Nanosheets as an Efficient Electrocatalysis for Oxygen Evolution Reactions

et al. 2020

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HIGHLIGHTS • The 2.27-nm-thick hybridized quasi-2D structure of La 2 O 3 crystalline nanoparticles embedded in La 2 O 3 amorphous nanosheets (La 2 O 3 @NP-NS) exhibited a low overpotential of 310 mV at 10 mA cm −2. • The mass activity of La 2 O 3 @NP-NS reached as high as 6666.7 A g −1 at overpotential of 310 mV. Such a high mass activity was more than three orders of magnitude higher than that of benchmark IrO 2 (4.4 A g −1) and RuO 2 (2.05 A g −1) and five orders of magnitude higher than that of commercial La 2 O 3 (0.048 A g −1).

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“…The electrochemical behavior of TCP coated AA 2024-T3 as a function of post-treatment time will be presented hereafter to confirm the hypothesis of optimal properties of post-treated TCP coating. [74,75] as discussed in our previous work [25].…”

Section: Accepted Manuscriptmentioning

confidence: 97%

Influence of post-treatment time of trivalent chromium protection coating on aluminium alloy 2024-T3 on improved corrosion resistance

Stoica

Światowska

Romaine

et al. 2019

Surface and Coatings Technology

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Low corrosion protection performances of Trivalent Chromium Process (TCP) coatings with reference to Chromium Conversion Coatings (CCC) deposited on aluminium alloys can be overcome by application of post-treatment processes. This work shows the effect of post-treatment bath (containing hydrogen peroxide and lanthanum salt) on the chemical composition, structure and the corrosion performances of TCP coating deposited on AA 2024-T3 aluminium alloy. Different times of post-treatment bath were applied on the TCP coating and the samples were analyzed by Time-of-Flight Secondary Ion Mass Spectrometry (ToF-SIMS), X-ray Photoelectron Spectroscopy (XPS) and Glow Discharge-Optical Emission Spectrometry (GD-OES). The ToF-SIMS and GD-OES depth profiles show that the post-treatment time has no influence on the thickness of the TCP coating and on its bi-layered structure. It is composed of an outer layer, rich in zirconium and chromium oxides and an inner layer rich in aluminium oxides and oxy-fluorides. 3D ToF-SIMS images reveal an enrichment of Cr and Zr-like species over the surface of intermetallic particles with reference to alloy matrix, whereas a homogenous distribution of La is observed. The analysis of in-depth distribution shows that La is present principally in the outer part of the TCP coating. The La concentration increases with increasing post-treatment time. The effect of post-treatment time on protection was evaluated by Electrochemical Impedance Spectroscopy (EIS) and Linear Sweep Voltammetry (LSV) in a 0.001 M NaCl + 0.1 M Na 2 SO 4 electrolyte. The increased posttreatment time enhances the cathodic inhibition against oxygen reduction. The post-treatment provides improved coating homogeneity and sealing properties.

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Synthesis and physicochemical properties of La(OH)3 and La2O3 nanostructures

Cited by 94 publications

References 50 publications

Synthesis and CO Oxidation Activity of 1D Mixed Binary Oxide CeO2-LaO x Supported Gold Catalysts

Synthesis and CO Oxidation Activity of 1D Mixed Binary Oxide CeO2-LaO x Supported Gold Catalysts

Nanoparticle-Decorated Ultrathin La2O3 Nanosheets as an Efficient Electrocatalysis for Oxygen Evolution Reactions

Influence of post-treatment time of trivalent chromium protection coating on aluminium alloy 2024-T3 on improved corrosion resistance

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