Sensitivity of Nanocrystalline MgH<sub>2</sub>−V Hydride Composite to the Carbon Monoxide during a Long-Term Cycling
Bibliographic record
Abstract
In this work, we present the results of the investigation of the effect of prolonged cycling on the hydriding/dehydriding properties and on the structure of nanocrystalline MgH 2 −V composite under hydrogen containing 110 ppm of carbon monoxide. The hydrogen charge and discharge kinetics of the nanocomposite hydride were examined at 300 °C using up to 1000 cycles. Pressure composition isotherm measurements at 300 °C were also carried out. The measured kinetics curves show a significant and systematic slowing down of the absorption and desorption rates and, consequently, a decreased amplitude and delayed heat transfer signals in the reaction temperature curves. Associated with this effect, we observe an enlargement of the pressure hysteresis and a gradual enhancement of the plateau slopes. The results also show some loss in the hydrogen storage capacity of the composite during cycling. The X-ray crystal structure analysis after 1000 cycles reveals that the degradation of the hydriding and dehydriding properties of the sample is related to the crystal growth and the formation of MgO x phases.
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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 | 0.000 |
| 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".