Oxidation of lanthanum overlay ers on Cu(111)

Asha, A.M.; Nix, Roger M.

doi:10.1016/0039-6028(95)90015-2

Cited by 23 publications

(10 citation statements)

References 20 publications

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“…Sputtering was not stopped during these measurements in order to avoid sub-monolayer amounts of O to be adsorbed on the sample due to the expected high reactivity and high sticking coefficients of O on La and Ce (see ESI †). 43,44 This procedure did not induce any signicant changes in the Ce 3d, La 3d and Pt 4f peak shape but prevented the presence of C and O contaminations: lower than 1% in all cases. Subsequently, samples were transferred to a fast-entry air lock, vented in dry nitrogen up to atmospheric pressure and readily protected by a drop of H 2 -saturated Milli-Q water for transfer to a rotating ring disk electrode assembly.…”

Section: Physical Characterizationmentioning

confidence: 97%

Enhanced activity and stability of Pt–La and Pt–Ce alloys for oxygen electroreduction: the elucidation of the active surface phase

et al. 2014

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Section: Physical Characterizationmentioning

confidence: 97%

Enhanced activity and stability of Pt–La and Pt–Ce alloys for oxygen electroreduction: the elucidation of the active surface phase

et al. 2014

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“…The area of the peaks attributed to adsorbed species and terminal hydroxyl groups are higher for La-template than for La-conv. The presence of these surface species is related to oxygen vacancies and, as has been previously observed, [21] the template synthesis method induces the creation of oxygen vacancies due to the O 2 -poor environment created into the solid macroporous structure during the combustion of the PMMA template.…”

Section: Micro-xrf Xrd and Xps Characterizationmentioning

confidence: 58%

“…The O1s spectra (Figure 2a) of the copper-free samples can be deconvoluted in three peaks at 530.5, 531.4 and 532.7 eV respectively, attributed to lattice oxygen, [18] a mixture of differ- ent adsorbed surface species that includes CO 3 2À , OH À and O À , [16] and terminal hydroxyl groups, [18,21] respectively. The area of the peaks attributed to adsorbed species and terminal hydroxyl groups are higher for La-template than for La-conv.…”

Section: Micro-xrf Xrd and Xps Characterizationmentioning

confidence: 99%

Copper‐Lanthanum Catalysts for NOx and Soot Removal

et al. 2020

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The individual and simultaneous removal of NOx by Storage and Reduction with H2 (H2‐NSR) and combustion of soot have been studied for La and CuLa catalysts. The NOx storage capacity of pure lanthanum oxide is improved either by copper addition or by using a colloidal crystal hard template for the synthesis of a macroporous structure. Although the NOx storage capacity of the CuLa macroporous material is around ten times lower regarding conventional PtBa catalysts, the kinetics of the H2‐NSR cycles are fast enough to allow high NOx removal (until 90 % removal). Lanthanum oxide catalyst prepared with uncontrolled structure has no activity for soot combustion, but the activity increases for a macroporous counterpart prepared using the colloidal crystal template because the macroporous structure improves the soot‐catalyst contact and allows the nitrogen‐oxygen surface groups yielded upon NOx chemisorption to oxidize soot. The soot combustion activity of lanthanum catalysts is also enhanced upon copper loading, because copper improves the NO2‐assisted soot combustion mechanism and favors the chemisorption of NOx, enhancing soot oxidation by nitrogen‐oxygen surface species. Finally, it is demonstrated that the simultaneous removal of NOx by H2‐NSR and soot combustion can be carried out with a CuLa catalyst at 450 °C. The simultaneous removal does not affect the combustion of soot and only has a small effect in NOx removal.

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“…The peaks at 157.5 and 159.6 eV are assigned to 3d 5/2 and 3d 3/2 of Y in Y 2 O 3 , respectively (fig. S9A) ( 36 ), and the peaks at 156.4 and 158.5 eV are assigned to 3d 5/2 and 3d 3/2 of Y in Y(0), respectively ( 37 ). The XPS analysis proved the reduction of Y 2 O 3 to Y metal by the FJH process, while the small ratio of Y 2 O 3 might be from the surface oxidation.…”

Section: Resultsmentioning

confidence: 99%

Rare earth elements from waste

et al. 2022

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Rare earth elements (REEs) are critical materials in electronics and clean technologies. With the diminishing of easily accessible minerals for mining, the REE recovery from waste is an alternative toward a circular economy. Present methods for REE recovery suffer from lengthy purifications, low extractability, and high wastewater streams. Here, we report an ultrafast electrothermal process (~3000°C, ~1 s) based on flash Joule heating (FJH) for activating wastes to improve REE extractability. FJH thermally degrades or reduces the hard-to-dissolve REE species to components with high thermodynamic solubility, leading to ~2× increase in leachability and high recovery yields using diluted acid (e.g., 0.1 M HCl). The activation strategy is feasible for various wastes including coal fly ash, bauxite residue, and electronic waste. The rapid FJH process is energy-efficient with a low electrical energy consumption of 600 kWh ton −1 . The potential for this route to be rapidly scaled is outlined.

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Oxidation of lanthanum overlay ers on Cu(111)

Cited by 23 publications

References 20 publications

Enhanced activity and stability of Pt–La and Pt–Ce alloys for oxygen electroreduction: the elucidation of the active surface phase

Enhanced activity and stability of Pt–La and Pt–Ce alloys for oxygen electroreduction: the elucidation of the active surface phase

Copper‐Lanthanum Catalysts for NOx and Soot Removal

Rare earth elements from waste

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