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.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
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) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.000 | 0.001 |
| Open science | 0.002 | 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".