Reaction mechanisms for electrolytic manganese dioxide in rechargeable aqueous zinc-ion batteries
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Bibliographic record
Abstract
Abstract This study reports the phase transformation behaviour associated with electrolytic manganese dioxide (EMD) utilized as the positive electrode active material for aqueous zinc-ion batteries. Electrochemical techniques, including galvanostatic charge–discharge and rotating ring-disk electrode measurements, and microstructural techniques, using X-ray powder diffraction, scanning electron microscopy, and transmission/scanning transmission electron microscopy, were utilized to characterize the positive electrode at different stages of discharge and charge of zinc-ion cells. The results indicate that, during discharge, a fraction of EMD undergoes a transformation to ZnMn 2 O 4 (spinel-type) and Zn 2+ is intercalated into the tunnels of the γ- and ε-MnO 2 phases, forming Zn x MnO 2 (tunnel-type). When a critical concentration of Mn 3+ in the intercalated Zn x MnO 2 species is reached, a disproportionation/dissolution reaction is triggered leading to the formation of soluble Mn 2+ and hydroxide (OH – ) ions; the latter precipitates as zinc hydroxide sulfate (ZHS, Zn 4 (OH) 6 (SO 4 )·5H 2 O) by combination with the ZnSO 4 /H 2 O electrolyte. During charge, Zn 2+ is reversibly deintercalated from the intergrown tunneled phases (γ-/ε-Zn x MnO 2 ), Mn 2+ is redeposited as layered chalcophanite (ZnMn 3 O 7 ·3H 2 O), and ZHS is decomposed by protons (H + ) formed during the electrochemical deposition of chalcophanite.
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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) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| 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 it