Hydrogen/oxygen polymer electrolyte membrane fuel cell (PEMFC) based on acid-doped polybenzimidazole (PBI)
Bibliographic record
Abstract
The potential-current characteristics of a H 2 /O 2 polymer electrolyte membrane fuel cell using H 2 SO 4 or H 3 PO 4 doped PBI were studied for the first time. The conditions involved in the doping of PBI with sulphuric acid or phosphoric acid and the preparation of a membrane electrode assembly (MEA) using these membranes were determined. The potential-current fuel-cell characteristics of MEAs using H 2 SO 4 -doped PBI were compared to those of MEAs using Nafion 117. The effects of membrane doping and of drying times on the fuel-cell performances of MEAs based on PBI doped with sulphuric acid in various conditions were determined. It was shown that MEAs based on H 2 SO 4 - doped PBI and non-humidified exhibited higher fuel-cell characteristics than MEAs based on Nafion 17. The fuel-cell characteristics of MEAs based on phosphoric-acid-doped PBI exhibited high performances at 185 oC even with fuelled with hydrogen containing 3% CO.
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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 | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 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".