Carbon fiber paper fabricated by CVD for application of proton exchange membrane fuel cell
Bibliographic record
Abstract
PAN based carbon fiber paper(CFP)preform was fabricated using nonwoven fabrics method,and carbon fiber paper was obtained through chemical vapor deposition(CVD)technology and graphitization process at 2 000℃.The microstructures of CFP and its preform were observed by SEM and PLM,and the graphitization degree of CFP was determined by XRD.The electrical performances were measured using the four-probe technique.The results indicate that the as-prepared CFP preform by nonwoven fabrics method has a network structure with randomly accumulated carbon fibers and well-dispersed porosity.The results show that pyrocarbon through CVD process has rough laminar microstructure,and carbon fibers in the CFP are compactly connected by pyrocarbon.The average graphitization degree of CFP is up to 82.2%which is higher than those of Japan Toray CFP and Canada Ballard CFP.Pyrocarbon from CVD process improves electrical performance of CFP greatly,the through-plane electrical resistivity of the CFP is 33.3 mΩ.cm,while those of Toray and Ballard CFP are 45.2 and 135.9 mΩ.cm,respectively;the in-plane electrical resistivity of the CFP is 6.0 mΩ.cm,while those of Toray and Ballard CFP are 6.4 and 16.3 mΩ.cm,respectively.
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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 | 0.000 | 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".