Highly Efficient Ambient Temperature CO<sub>2</sub> Photomethanation Catalyzed by Nanostructured RuO<sub>2</sub> on Silicon Photonic Crystal Support
Bibliographic record
Abstract
Abstract Sunlight‐driven catalytic hydrogenation of CO 2 is an important reaction that generates useful chemicals and fuels and if operated at industrial scales can decrease greenhouse gas CO 2 emissions into the atmosphere. In this work, the photomethanation of CO 2 over highly dispersed nanostructured RuO 2 catalysts on 3D silicon photonic crystal supports, achieving impressive conversion rates as high as 4.4 mmol g cat −1 h −1 at ambient temperatures under high‐intensity solar simulated irradiation, is reported. This performance is an order of magnitude greater than photomethanation rates achieved over control samples made of nanostructured RuO 2 on silicon wafers. The high absorption and unique light‐harvesting properties of the silicon photonic crystal across the entire solar spectral wavelength range coupled with its large surface area are proposed to be responsible for the high methanation rates of the RuO 2 photocatalyst. A density functional theory study on the reaction of CO 2 with H 2 revealed that H 2 splits on the surface of the RuO 2 to form hydroxyl groups that participate in the overall photomethanation process.
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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 | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.000 | 0.001 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.001 | 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; both teacher heads agree on what is shown here.
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".