Non-isothermal hydrogen desorption from β-UH3: Kinetics and mechanism

David, Roey Ben; Bitton, N.; Simca, F.; Samuha, Shmuel; Fadel, Dvir; Danon, Albert; Finkelstein, Y.

doi:10.1016/j.jnucmat.2018.08.023

Cited by 5 publications

(2 citation statements)

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“…Moreover, the TPR signal from the Ce 1– x U x O 2+δ oxides with x = 0.25 and x = 0.5 increases exponentially with temperature and drops rapidly when all the H 2 O molecules have been desorbed. The resulting shape corresponds to a zero-order kinetic, meaning the reaction rate is independent of the reactant concentration (once the available oxygen has been removed, the reaction ends immediately) . The relatively fast extraction of oxygen by H 2 in these mixed oxides compared to CeO 2 suggests a lower activation energy for extraction of oxygen.…”

Section: Resultsmentioning

confidence: 99%

“…The resulting shape corresponds to a zero-order kinetic, meaning the reaction rate is independent of the reactant concentration (once the available oxygen has been removed, the reaction ends immediately). 32 The relatively fast extraction of oxygen by H 2 in these mixed oxides compared to CeO 2 suggests a lower activation energy for extraction of oxygen.…”

Section: Thermal Analysis Of the Oxygen Extracted By Tprmentioning

confidence: 92%

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Exploring the Redox Properties of Ce_1–xU_xO_2±δ (x ≤ 0.5) Oxides for Energy Applications

Shelly

Schweke²,

Danon³

et al. 2023

Inorg. Chem.

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The Ce−U−O system, forming a solid solution in the fluorite structure, has gained much attention due to its unique properties. Mixed fluorite oxide powders of Ce 1−x U x O 2±δ compositions were found to be particularly active for H 2 production through thermochemical water splitting. In the present work, we explore the reduction− oxidation properties of the mixed oxides with x = 0.1, 0.25, and 0.5. We report a particularly high oxygen storage capacity (OSC) for x ≥ 0.25 and show that the oxygen extracted from these mixed oxides is of a different origin than that extracted from CeO 2 . While in ceria, oxygen is extracted from the tetrahedral sites, leading to the formation of oxygen vacancies, the extracted oxygen in Ce 1−x U x O 2±δ (x ≥ 0.25) is essentially excess oxygen in the fluorite lattice (which spontaneously penetrates the oxide under ambient or oxidative conditions). This property, which is clearly related to the change in the valency of the U cations, is apparently responsible for the higher OSC and the lower activation energy for oxygen extraction from the mixed oxides compared to ceria. The mixed oxide powders are shown to be structurally stable, retaining their fluorite structure following reduction under Ar−5%H 2 or oxidation in air until 1000 °C. The presented results provide new insights into the Ce−U−O system which may be exploited for future technical applications, as a catalyst for thermochemical water splitting, or as a solid electrolyte in solid oxide fuel cells.

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Section: Resultsmentioning

confidence: 99%

Section: Thermal Analysis Of the Oxygen Extracted By Tprmentioning

confidence: 92%

Exploring the Redox Properties of Ce_1–xU_xO_2±δ (x ≤ 0.5) Oxides for Energy Applications

Shelly

Schweke²,

Danon³

et al. 2023

Inorg. Chem.

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Mechanical behavior of electrochemically hydrogenated electron beam melting (EBM) and wrought Ti–6Al–4V using small punch test

Lulu-Bitton

Sabatani²,

Rosen

et al. 2022

International Journal of Hydrogen Energy

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The influence of gaseous hydrogen charging on the microstructural and mechanical behavior of electron beam melted and wrought Ti–6Al–4V alloys using the small punch test

Lulu-Bitton,

Navi,

Rosen

et al. 2023

International Journal of Hydrogen Energy

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Non-isothermal hydrogen desorption from β-UH3: Kinetics and mechanism

Cited by 5 publications

References 39 publications

Exploring the Redox Properties of Ce_1–xU_xO_2±δ (x ≤ 0.5) Oxides for Energy Applications

Exploring the Redox Properties of Ce_1–xU_xO_2±δ (x ≤ 0.5) Oxides for Energy Applications

Mechanical behavior of electrochemically hydrogenated electron beam melting (EBM) and wrought Ti–6Al–4V using small punch test

The influence of gaseous hydrogen charging on the microstructural and mechanical behavior of electron beam melted and wrought Ti–6Al–4V alloys using the small punch test

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Non-isothermal hydrogen desorption from β-UH3: Kinetics and mechanism

Cited by 5 publications

References 39 publications

Exploring the Redox Properties of Ce1–xUxO2±δ (x ≤ 0.5) Oxides for Energy Applications

Exploring the Redox Properties of Ce1–xUxO2±δ (x ≤ 0.5) Oxides for Energy Applications

Mechanical behavior of electrochemically hydrogenated electron beam melting (EBM) and wrought Ti–6Al–4V using small punch test

The influence of gaseous hydrogen charging on the microstructural and mechanical behavior of electron beam melted and wrought Ti–6Al–4V alloys using the small punch test

Contact Info

Product

Resources

About

Exploring the Redox Properties of Ce_1–xU_xO_2±δ (x ≤ 0.5) Oxides for Energy Applications

Exploring the Redox Properties of Ce_1–xU_xO_2±δ (x ≤ 0.5) Oxides for Energy Applications