Enhancing the Performance of Non-noble Metal Catalysts for the Reduction of O2 in PEM Fuel Cells: is the Adsorption of Iron the Limiting Factor for Increasing the Site Density of the Catalysts?
Bibliographic record
Abstract
The adsorption of iron II acetate over two microporous carbon blacks of different surface properties was studied in order to determine if this factor limits the activity of Fe/N/C catalysts for ORR made with these carbon supports. Whereas one of these carbons only had oxygen-derived functionalities over its surface, the other one contained both oxygen and nitrogen bearing functionalities. Their points of zero charge (PZC) were first determined to be 3.9 and 8.8, respectively. Adsorption curves showing the evolution of the metallic uptake with the pH revealed that both carbon supports are able to adsorb 100% of the positive Fe ions in solution at pH>4, and this up to 0.8 wt% Fe. Therefore, the adsorption of iron is not the factor responsible for the limited site density of Fe/N/C catalysts having a Fe content {less than or equal to} 0.8 wt% loaded either by adsorption or by wet-impregnation of the carbon supports.
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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".