Ion Exchange and Electron Transport at Methyl Viologen Y Modified Electrodes
Bibliographic record
Abstract
Cyclic voltammetry and chronocoulometry were used to study reduction of the methyl viologen dication to the cation radical at zeolite-Y-modified electrodes. Shifts in half wave potential as a function of both scan rate and MV 2+ loading were shown to be due to a concentration overpotential produced by the ion exchange equilibrium at the zeolite-solution interface. Incorporation of the ion exchange-equilibrium constant for ion exchange between sodium cations and intrazeolite methyl viologen into the Nernst equation shows that equilibrium at the zeolite−solution interface is set up rapidly on the electrochemical time scale. Electron transport to the methyl viologen dication (MV 2+ ) is also shown to occur via an extrazeolite mechanism. The electrochemical reaction rate is controlled by diffusion of methyl viologen dications from zeolite Y rather than by incorporation of charge balancing cations from the electrolyte solution. Chronoamperometric data are discussed in terms of several plausible electron transport mechanisms including percolation, coupled electron hopping, and ion exchange. The latter agrees well with the experimental data and is in keeping with rate control for an ion-exchange step from a spherical zeolite particle.
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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".