Beneficial Effects of Adsorbate-Induced Surface Segregation of Pt in Nanoporous Metals Fabricated by Dealloying of Ag-Au-Pt Alloys
Bibliographic record
Abstract
Surface segregation of Pt is investigated in nanoporous metals formed by dealloying of Ag-Au-Pt alloys. By exposing freshly-dealloyed nanostructures to surprisingly low temperatures in the presence of laboratory air, the Pt segregates to the surface of the ligaments thanks to its preferential interaction with oxygen; in contrast, in an inert atmosphere (Ar-H2), Pt mostly remains in the bulk of the ligaments. Moreover, the co-segregation of Pt and O hinders the thermal coarsening of the ligaments. The averaged size of the ligaments, the resulting roughness factor (Rf) and the fraction of Pt atoms on the surface of the ligaments were investigated. Scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy and low energy ion scattering were used to characterize the resulting nanoporous structure, in addition to electrochemical methods such as underpotential deposition of hydrogen and cyclic voltammetry.
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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) | 0.001 | 0.001 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 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".