Kinetics and mechanism of the oxidation of cerium in air at ambient temperature

Wheeler, D.W.

doi:10.1016/j.corsci.2016.04.025

Cited by 35 publications

(17 citation statements)

References 29 publications

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“…13). The observation of Ce 2 O 3 at the LM/air interface is consistent with oxidation studies on metallic cerium, which initially oxidised to form Ce 2 O 3 , which then partially converts to CeO 2 after prolonged exposure to air (days) 27 .…”

Section: Resultssupporting

confidence: 85%

Room temperature CO2 reduction to solid carbon species on liquid metals featuring atomically thin ceria interfaces

et al. 2019

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Negative carbon emission technologies are critical for ensuring a future stable climate. However, the gaseous state of CO 2 does render the indefinite storage of this greenhouse gas challenging. Herein, we created a liquid metal electrocatalyst that contains metallic elemental cerium nanoparticles, which facilitates the electrochemical reduction of CO 2 to layered solid carbonaceous species, at a low onset potential of −310 mV vs CO 2 /C. We exploited the formation of a cerium oxide catalyst at the liquid metal/electrolyte interface, which together with cerium nanoparticles, promoted the room temperature reduction of CO 2 . Due to the inhibition of van der Waals adhesion at the liquid interface, the electrode was remarkably resistant to deactivation via coking caused by solid carbonaceous species. The as-produced solid carbonaceous materials could be utilised for the fabrication of high-performance capacitor electrodes. Overall, this liquid metal enabled electrocatalytic process at room temperature may result in a viable negative emission technology.

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Section: Resultssupporting

confidence: 85%

Room temperature CO2 reduction to solid carbon species on liquid metals featuring atomically thin ceria interfaces

et al. 2019

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“…The rate of homogenization was used to obtain an activation energy of 126 kJ.mol -1 for diffusion of La in Ce. The oxidation behaviour of a Ce-La alloy has also been studied by one of the present authors [18] and it was found that the addition of La to Ce resulted in an increase in the rate of oxidation compared to unalloyed Ce [19]. This was attributed to the more porous nature of the oxide structure on the alloy, such as a larger lattice parameter and elevated defect levels, which served to enhance the diffusion of oxygen through the oxide to react with the underlying metal.…”

Section: Introductionmentioning

confidence: 71%

“…Other work by one of the authors [19] on the oxidation of Ce in air at ambient temperature has shown that the oxidation of Ce proceeds in a linear manner. This was demonstrated by XRD and corroborated by direct measurements of the oxide thickness from transverse sections of oxidised specimens.…”

Section: Effect Of Oxidation On Nanoindentation Measurementsmentioning

confidence: 95%

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Structure and mechanical properties of Ce-La alloys containing 3-10 wt. % La

Wheeler

Zekonyte

Wood

2021

Journal of Nuclear Materials

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“…Two oxidation states can be observed in the pristine CeO 2 WE case, which was dominated by Ce 4+ . This was likely due to air oxidation during storage [29,30]. The calculated ratio between Ce 3+ and Ce 4+ in the pristine WE case are 29.7% and 70.3%, respectively.…”

Section: Xps Analysismentioning

confidence: 88%

Studying Corrosion Using Miniaturized Particle Attached Working Electrodes and the Nafion Membrane

et al. 2021

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We developed a new approach to attach particles onto a conductive layer as a working electrode (WE) in a microfluidic electrochemical cell with three electrodes. Nafion, an efficient proton transfer molecule, is used to form a thin protection layer to secure particle electrodes. Spin coating is used to develop a thin and even layer of Nafion membrane. The effects of Nafion (5 wt% 20 wt%) and spinning rates were evaluated using multiple sets of replicates. The electrochemical performance of various devices was demonstrated. Additionally, the electrochemical performance of the devices is used to select and optimize fabrication conditions. The results show that a higher spinning rate and a lower Nafion concentration (5 wt%) induce a better performance, using cerium oxide (CeO2) particles as a testing model. The WE surfaces were characterized using atomic force microscopy (AFM), scanning electron microscopy-focused ion beam (SEM-FIB), time-of-flight secondary ion mass spectrometry (ToF-SIMS), and X-ray photoelectron spectroscopy (XPS). The comparison between the pristine and corroded WE surfaces shows that Nafion is redistributed after potential is applied. Our results verify that Nafion membrane offers a reliable means to secure particles onto electrodes. Furthermore, the electrochemical performance is reliable and reproducible. Thus, this approach provides a new way to study more complex and challenging particles, such as uranium oxide, in the future.

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Kinetics and mechanism of the oxidation of cerium in air at ambient temperature

Cited by 35 publications

References 29 publications

Room temperature CO2 reduction to solid carbon species on liquid metals featuring atomically thin ceria interfaces

Room temperature CO2 reduction to solid carbon species on liquid metals featuring atomically thin ceria interfaces

Structure and mechanical properties of Ce-La alloys containing 3-10 wt. % La

Studying Corrosion Using Miniaturized Particle Attached Working Electrodes and the Nafion Membrane

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