Effect of Hydrogen on the Dissolution of Uranium Dioxide in Peroxide-Containing Environments
Bibliographic record
Abstract
The ability of hydrogen (H 2 ) to scavenge hydroxy radicals (OH • ) created by the dissociation of hydrogen peroxide (H 2 O 2 ) on the surface of uranium dioxide (U IV O 2 ) has been studied in a chloride/bicarbonate (pH = 9.5) solution. The oxidation/reduction of the oxide surface was monitored by measuring the corrosion potential as a function of time in this solution, containing various concentrations of H 2 O 2 sparged with either Ar or an Ar/H 2 mixture. The surface oxidation was subsequently determined using X-ray photoelectron spectroscopy. In the absence of H 2 , the peroxide oxidized the surface to U IV 1–2x U V 2x O 2+x with x varying with H 2 O 2 concentration and eventually achieved a composition of U IV 0.34 U V 0.66 O 2.33 . At this surface composition, the surface becomes unstable with respect to dissolution, but the dominant reaction is H 2 O 2 decomposition. In the presence of H 2 , the initial oxidation of the U IV O 2 when H 2 O 2 was added was reversed by the ability of H 2 to scavenge the OH • with the H • radicals formed. This led to a reduction of the oxidized surface. The efficiency of this process is determined by the relative concentrations of H 2 O 2 and H 2 .
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".