A structure-based model for cathode catalyst layer of polymer electrolyte membrane fuel cell
Bibliographic record
Abstract
A structure-based performance model for Cathode Catalyst Layers (CCLs) of Polymer Electrolyte Membrane Fuel Cells (PEMFCs) is presented. A CCL is the major competitive ground for mass transport, electrochemical reaction, and vaporization in a PEMFC. Analytical solutions for the case of fast proton transport have revealed that the CCL plays a vital role in the conversion of liquid water to vapor and in regulating water fluxes towards Polymer Electrolyte Membrane (PEM) and Gas Diffusion Layer (GDL). Critical values of proton conductivity and oxygen transport coefficient are introduced to distinguish different regimes of operation for these transport processes. Subsequently, the role of the porous structure and of liquid water accumulation for the performance of CCL in PEMFCs is explored. The non-linear spatial coupling between liquid water accumulation and oxygen depletion triggers critical effects and bistability in current-voltage response curves. Stability diagrams are proposed as novel tools for assessing CCL performance.
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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) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.001 | 0.002 |
| Open science | 0.003 | 0.001 |
| Research integrity | 0.003 | 0.001 |
| Insufficient payload (model declined to judge) | 0.007 | 0.002 |
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".