Limestone Conversion to Cement Clinker Precursor in a Zero-Gap Electrolyzer
Bibliographic record
Abstract
The carbon intensity of industrial cement production could be reduced by replacing the high-temperature kilns used to decompose limestone (CaCO 3(s) ). One possible solution is to use electrochemical reactors to convert CaCO 3(s) into Ca(OH) 2(s) . The challenge is that most continuous-flow electrochemical reactors reported to date require voltages that are too high (>4 V at 100 mA cm –2 ) to be practical. A key reason for these high voltages is that the reactors contain a chemical chamber inserted between the anode and cathode chambers, which leads to a high Ohmic resistance. In this study, we present an electrolyzer that decomposes CaCO 3(s) into reactive Ca 2+ ions using only two chambers. This cell design, with an anode and cathode chamber separated by a membrane instead of a chemical chamber, follows a “zero-gap” configuration akin to hydrogen-producing electrolyzers and fuel cells. We also engage the reversible redox activity of (hydro)anthraquinones to mediate oxidation and reduction within a narrow electrochemical window. The streamlined “cement electrolyzer” is capable of operating at an initial full cell voltage of 0.38 V at 100 mA cm –2 with 100% proton efficiency.
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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 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| 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".