Kinetics and Electrocatalysis of Methanol Oxidation on Electrodeposited Pt and Pt70Ru30 Catalysts
Bibliographic record
Abstract
Most relevant aspects of the reaction kinetics and the mechanism of methanol electrooxidation on electrodeposited Pt and Pt70Ru30 catalysts in 1 mol dm^-3 HClO_4 solution are discussed on the basis of cyclic voltammetry, quasipotentiostatic, chronoamperometry and electrochemical impedance spectroscopy (EIS) measurements. The exact chemical composition of Pt-Ru catalysts has been determined using X-ray photoelectron spectroscopy (XPS). The deduced values of kinetic parameters: the Tafel slope (b_a), the exchange current density (j_0) and the rate constant (k_a) as well as the order of the reaction (n) indicate significantly faster kinetics of the anodic oxidation of methanol on the Pt70Ru30 catalyst in comparison with the electrodeposited Pt. The maximum rate of oxidation is obtained at potentials at which the fractional coverage (theta) of adsorbed species is governed by a Langmuir adsorption isotherm ( delta G_ads = -30 kJ mol^-1) and majority of OH_ads species is consumed for oxidative removal of CO_ads in an autocatalytic step in the Langmuir-Hinshelwood type of reaction. Kinetic analysis and the obtained value of the diffusion coefficient of the order of 10^-7 cm^2s^-1 suggest that the rate-limiting interaction mechanism between CO_ads and OH_ads species involves fast surface diffusion of CO_ads from Pt sites to active Ru sites.
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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) | 0.001 | 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".