On the Determination of PEM Fuel Cell Catalyst Layer Resistance from Impedance Measurement in H<sub>2</sub>/N<sub>2</sub>Cells
Bibliographic record
Abstract
The commonly employed the H2/N2 cell impedance method for the determination of PEMFC catalyst layer ionic resistance often results in significant deviations from the predicted idealized homogeneous catalyst layer properties. In this study, the effect of the distribution of resistance and capacitance within the thickness of the CL is modeled to examine whether it explains the observed deviations. It is found that uniformly and non-uniformly distributed CLs show limiting real impedance (vertical line on Nyquist plot) at low frequency, as long as the impedance has no faradaic contribution. However, using this value of real impedance for obtaining the ionic resistance of the catalyst layer leads to significant errors if the system is non-uniformly distributed. It is shown that Nyquist plots with non-vertical mid-frequency regions, resembling experimentally measured H2/N2 cell response, can be generated with a "nested" transmission line circuit (agglomerate model) if there is a significant difference in resistance in different agglomerates.
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How this classification was reachedexpand
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 | 0.001 | 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 | 0.001 |
| 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 itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, 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".