Relative Humidity Effect on Anode Durability in PEMFC Startup/Shutdown Processes
Bibliographic record
Abstract
Ru dissolution and crossover to the cathode from PtRu anode catalysts, which are commonly used in polymer electrolyte membrane fuel cells (PEMFCs) to provide CO tolerance for reformate-based fuel cell applications, have been previously identified as critical durability issues. In this investigation, the effect of relative humidity (RH) on Ru dissolution and crossover was studied using an anode accelerated stress test (AST) to mimic anode potential variation that occur during fuel cell start-ups and shut-downs. Stress testing at lower RH resulted in less Ru degradation, which was indicated by changes in cyclic voltammetry (CV), namely CO stripping peak shifts. The relative degree of Ru crossover was also reflected by the decreases in cell performance and CO tolerance. The results highlight the critical role of water in the Ru degradation mechanism and indicate that controlling the RH could be an effective strategy to mitigate Ru crossover.
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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 | 0.001 | 0.001 |
| 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 | 0.001 | 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".