In Situ Raman Study of Amorphous and Crystalline Ni-Co Alloys for the Alkaline Oxygen Evolution Reaction
Bibliographic record
Abstract
Amorphous Ni 79.2-x Co x Nb 12.5 Y 8.3 (x = 0, 5 at.%) alloys were synthesized using cryogenic mechanical alloying and evaluated as catalyst for the oxygen evolution reaction (OER) in alkaline media using cyclic voltammetry and Tafel measurements. Electrochemical testing showed that the amorphous alloys possessed lower Tafel values for the OER compared to crystalline Ni and Ni 95 Co 5 . Anodic cycling of amorphous Ni 74.2 Co 5 Nb 12.5 Y 8.3 resulted in a lower onset potential for the OER and decreased Tafel values while no changes were observed for amorphous Ni 79.2 Nb 12.5 Y 8.3 and crystalline Ni 95 Co 5 . Pairing of in situ confocal Raman spectroscopy with anodic cycling showed that the amorphous Ni 74.2 Co 5 Nb 12.5 Y 8.3 alloy formed reversible hydrous Co surface species instead of irreversible CoO 2 typically seen on crystalline NiCo alloys in KOH. The formation of hydrous Co surface species upon cycling was also accompanied by increased formation of β-NiOOH leading to enhanced catalytic performance of amorphous Ni 74.2 Co 5 Nb 12.5 Y 8.3 alloy over the amorphous Ni 79.2 Nb 12.5 Y 8.3 and the crystalline counterparts.
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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 | 0.000 | 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) | 0.001 | 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".