Electrochemical Evidence of Two Types of Active Sites for Oxygen Reduction in Fe-based Catalysts
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Bibliographic record
Abstract
Fe-based catalysts for the reduction of oxygen were synthesized by wet-impregnation of FeII acetate or FeIII-porphyrin on pristine carbon black followed by pyrolysis in ammonia or argon. The catalysts were characterized using RDE and RRDE voltammetry in both acid and alkaline electrolytes. The results support the presence of two types of active sites for oxygen reduction in these catalysts: (i) the Fe-N4/C type, with a structure resembling the central porphyrin moiety, and (ii) the Fe-N2+2/C type, hosted in the micropores of the carbon support. Fe-N4/C sites are poorly active in acid but highly active in alkaline, whereas Fe-N2+2/C sites are highly active in both electrolytes.
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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 | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| 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 it