Effect of Phase Junction Structure on the Photocatalytic Performance in Overall Water Splitting: Ga<sub>2</sub>O<sub>3</sub> Photocatalyst as an Example
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Bibliographic record
Abstract
The fabrication of surface phase junctions has proven to be an efficient strategy for the enhancement of photocatalytic activity; however, some questions about these systems are not yet well understood. In this study, the photocatalytic overall water splitting reaction was achieved on photocatalysts with pure and mixed phase compositions of cubic γ-Ga 2 O 3 and monoclinic β-Ga 2 O 3 . All the Ga 2 O 3 photocatalysts can split water stoichiometrically into H 2 and O 2; however, the phase-mixed γ/β-Ga 2 O 3 photocatalyst with a small amount of β phase shows the lowest activity. This is opposite from that of the reported α/β-Ga 2 O 3 system in which the phase-mixed α/β-Ga 2 O 3 photocatalyst with a small amount of β phase shows much higher photocatalytic activity than the individual phases. Much more disordered structure is found between the γ and β phases in the γ/β-Ga 2 O 3 photocatalyst with low content of β phase due to the defective spinel structure of γ phase. Spectroscopic characterization and theoretical calculations indicate that the disordered structure serves as defect and charge recombination centers resulting in the decrease of photocatalytic activity. Based on the analysis of α/β-Ga 2 O 3 and γ/β-Ga 2 O 3 systems, it is proposed that a prerequisite for the formation of phase junction boosting photocatalytic reactions is that the interfacial structure between two phases should not be disordered or defective.
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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) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| 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)
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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