Optimization of Ternary Alloy Catalysts for PEMFC Cathodes
Bibliographic record
Abstract
Performance and durability of cathodes have been one of the main factors impeding commercialization of fuel cells for automotive applications. This work reports an optimized Rotating Disk Electrode (RDE) technique and a mass activity and durability for a baseline Pt/Graphitized Carbon (Pt/GC). An accelerated stress test (AST) is performed to determine the durability of the catalysts by cycling 30,000 times between 0.6 and 1.0V with a 1 sec hold at each potential. Mass activity and electrochemical surface area are measured at the beginning of life (BOL) and at the end of life (EOL) after 30,000 cycles. The BOL mass activity of the Pt/GC baseline is 218 A/g-Pt. In-house prepared Pt-Ni-Co ternary alloys show a BOL mass activity of 600-900 A/g-Pt for the best performing catalysts not shown in this report. However optimization of post heat and acid treatment of catalysts is necessary to improve the durability. The optimum temperature for the initial and final post heat treatment is found to be 400 oC for the ternary alloy catalysts. The heat-acid-heat treated catalyst is more durable showing a 52% degradation rate (EOL: 292 A/g-Pt) compared to 75% (EOL: 196 A/g-Pt) for the heat-acid treated catalysts.
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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 | 0.000 | 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 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".