Carbon Dioxide Evolution in Aqueous Zinc Metal Batteries
Bibliographic record
Abstract
Gas evolution reactions in aqueous zinc metal batteries (AZMBs) cause gas accumulation and battery swelling that negatively affect their performance. However, previous work often reported hydrogen as the main, if not the only, gas species evolved in AZMBs; the complexity of gas evolution has been overlooked. For the first time, this work found the CO 2 evolution reaction (CER) in AZMBs, pinpointed its sources, and identified electrolyte modulation strategies. Using differential electrochemical mass spectrometry, CER was detected in V 2 O 5 ||Zn full cells, instead of in asymmetric Cu||Zn cells, and it became substantial when being charged to 2.0 V. By using a carbon isotope tracing method, the primary origin of CER was identified as the electrochemical corrosion of conductive carbon at the cathode. Among six representative electrolytes, the weakly solvating electrolyte (3 m Zn(OTf) 2 in acetonitrile/water) presented a high CER resistance by reducing water solvating and disturbing hydrogen bonding. This work sheds light on interfacial parasitic reactions for practical aqueous metal (Zn and Al) batteries.
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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".