Effect of Hydrogen on the Dissolution of Uranium Dioxide in Peroxide-Containing Environments
Bibliographic record
Abstract
The ability of hydrogen (H2) to scavenge hydroxy radicals (OH•) created by the dissociation of hydrogen peroxide (H2O2) on the surface of uranium dioxide (UIVO2) 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 H2O2 sparged with either Ar or an Ar/H2 mixture. The surface oxidation was subsequently determined using X-ray photoelectron spectroscopy. In the absence of H2, the peroxide oxidized the surface to UIV 1–2xUV 2xO2+x with x varying with H2O2 concentration and eventually achieved a composition of UIV 0.34UV 0.66O2.33. At this surface composition, the surface becomes unstable with respect to dissolution, but the dominant reaction is H2O2 decomposition. In the presence of H2, the initial oxidation of the UIVO2 when H2O2 was added was reversed by the ability of H2 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 H2O2 and H2.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.001 |
| 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 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 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 source (direct Gemma or distilled Codex), 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".