Engineering the Oxygen Vacancies in Na <sub>2</sub> Ti <sub>3</sub> O <sub>7</sub> for Boosting Its Catalytic Performance in MgH <sub>2</sub> Hydrogen Storage
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Bibliographic record
Abstract
Development of catalysts with highly efficient catalytic performance has a significant status in accelerating the MgH2 hydrogen storage system. In this work, we report a Na2Ti3O7 catalyst with rich oxygen vacancies (Na2Ti3O7-Ov), which was synthesized from Ti3C2-MXene, and confirm a remarkable enhancement to the hydrogen storage performance of MgH2. Expressly, the initial dehydrogenation temperature of the MgH2 + 5Na2Ti3O7-Ov (an addition of 5 wt % Na2Ti3O7-Ov) composite reduced substantially from 287 °C (for MgH2) to 183 °C. Additionally, the MgH2 + 5Na2Ti3O7-Ov composite presented fast hydrogen ab/desorption kinetics and excellent reversible hydrogen storage performance with a retention rate of 90.1% after 10 cycles. Both experimental and theoretical calculations data verified that the oxygen vacancies in Na2Ti3O7-Ov reduce the reaction activation energy during MgH2 dehydrogenation and then convey an excellent hydrogen storage kinetics. This work provides a new design for advanced defect-based nanocatalysts for the MgH2 hydrogen storage system.
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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 | 0.002 | 0.002 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.002 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.001 | 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 it