Influence of MPL Structure Modification on Fuel Cell Oxygen Transport Resistance
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Bibliographic record
Abstract
In this work the dependence of limiting current on gas pressure and temperature was measured to separate the oxygen transport resistance into its components: molecular diffusion resistance in the gas diffusion layer (GDL) and resistance in the catalyst layer (CL), which comprises Knudsen diffusion resistance and oxygen permeation resistance through ionomer. The effect of microporous layer (MPL) modification by laser perforation on the oxygen transport resistances was investigated. The resistance in CL contributed a significant portion, about one quarter, to the total oxygen transport resistance. A trend of decreasing CL resistance with increasing temperature was observed. This temperature effect was mainly attributable to the oxygen permeation in CL ionomer. The MPL modification had little influence on the total transport resistance as well as its individual component for the cells under dry operation, while the perforated MPL significantly reduced the transport resistance when water starts to condense in electrode. This finding indicated that the MPL plays important roles in the cathode water management.
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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 | 0.000 |
| 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) | 0.000 | 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