DFT and experimental study on the thermal conductivity of U3O8 and U3O8-X; (X=Al and Mo)

Ranasinghe, Jayangani I.; Malakkal, Linu; Szpunar, Barbara; Prasad, Anil; Jossou, Ericmoore; Szpunar, Jerzy A.; Bichler, Lukas

doi:10.1016/j.jnucmat.2021.152900

Cited by 3 publications

(2 citation statements)

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“…Among the reactions of spent fuel, the most common source of U(V) is from U 3 O 8 that is transformed from UO 2 . Several U 3 O 8 studies reported that there were mixtures of U(V) and U(VI) [ 26 , 68 ], and that U(V) was not the dominant species obtained from such reactions. The effect of temperature was not investigated.…”

Section: Resultsmentioning

confidence: 99%

“…Many experiments were performed to study UO 2 spent fuel corrosion [ 3 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 ]. For example, Shoesmith’s group presented UO 2 corrosion mechanisms and reaction constants to study the α-radiolysis effect under conditions relevant to long-term waste storage using an electrochemical testing setup [ 24 ].…”

Section: Introductionmentioning

confidence: 99%

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Microscale Electrochemical Corrosion of Uranium Oxide Particles

Son,

Riechers,

2023

Micromachines

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Understanding the corrosion of spent nuclear fuel is important for the development of long-term storage solutions. However, the risk of radiation contamination presents challenges for experimental analysis. Adapted from the system for analysis at the liquid–vacuum interface (SALVI), we developed a miniaturized uranium oxide (UO2)-attached working electrode (WE) to reduce contamination risk. To protect UO2 particles in a miniatured electrochemical cell, a thin layer of Nafion was formed on the surface. Atomic force microscopy (AFM) shows a dense layer of UO2 particles and indicates their participation in electrochemical reactions. Particles remain intact on the electrode surface with slight redistribution. X-ray photoelectron spectroscopy (XPS) reveals a difference in the distribution of U(IV), U(V), and U(VI) between pristine and corroded UO2 electrodes. The presence of U(V)/U(VI) on the corroded electrode surface demonstrates that electrochemically driven UO2 oxidation can be studied using these cells. Our observations of U(V) in the micro-electrode due to the selective semi-permeability of Nafion suggest that interfacial water plays a key role, potentially simulating a water-lean scenario in fuel storage conditions. This novel approach offers analytical reproducibility, design flexibility, a small footprint, and a low irradiation dose, while separating the α-effect. This approach provides a valuable microscale electrochemical platform for spent fuel corrosion studies with minimal radiological materials and the potential for diverse configurations.

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Section: Resultsmentioning

confidence: 99%