Hydrogen Storage Properties of the Destabilized 4NaBH<sub>4</sub>/5Mg<sub>2</sub>NiH<sub>4</sub> Composite System
Bibliographic record
Abstract
A composite mixture of NaBH 4 and Mg 2 NiH 4 (4:5, M/M) was prepared by high-energy ball milling and was investigated for solid-state storage of hydrogen. Addition of Mg 2 NiH 4 to NaBH 4 leads to formation of the stable ternary boride phase MgNi 2.5 B 2 and lowers the enthalpy of hydrogen desorption for NaBH 4 from 110 to 76 ± 5 kJ mol –1 H 2 . As a consequence of this addition, the onset temperature of hydrogen desorption decreases from about 500 °C in NaBH 4 to 360 °C in the NaBH 4 /Mg 2 NiH 4 composite mixture. Furthermore, the system shows reversibility and is able to store 2.5 wt % hydrogen for a number of cycles. The impact of the ball milling time, the hydrogen desorption back-pressure, and cycling on the hydrogen desorption/absorption properties and crystallographic phases is discussed in detail.
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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 | 0.000 |
| 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) | 0.002 | 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".