Two-Dimensional Property Distributions, Ohmic Losses, and Power Consumption within a Fuel Cell Polymer Electrolyte Membrane
Bibliographic record
Abstract
The average and localized water content, current, ohmic loss, and power consumption distributions within a Nafion 117 polymer electrolyte membrane (PEM) were modeled in two dimensions to determine the influence of the cathodic flowfield plate on the properties and performance of a fuel cell. The membrane model was decoupled from the cathode and anode by using fixed, assumed anodic boundary conditions and cathodic boundary conditions from literature indicative of operation at three channel:land configurations (1:1, 2:1, and 4:1) and three nominal cathode overpotentials (NCOs) (0.3, 0.5, and 0.7 V). The results suggested that a 1:1 configuration maintained the membrane in a more-hydrated state that was better able to moderate changes in ohmic loss and power consumption due to changes in the NCO. Detailed distributions within the membrane showed complex anisotropy, including the existence of localized maxima along anodic boundaries, cathodic boundaries, and even along both anodic and cathodic boundaries under the same operating conditions.
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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 | 0.001 |
| 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".