Design Principles and Interfacial Engineering in an <i>In Situ</i> Grown Nickel Oxy-Nitride (Ni<sub><i>x</i></sub>O<sub><i>y</i></sub>N<sub><i>z</i></sub>) System Manifesting Synergistic Properties for Photocatalysis
Bibliographic record
Abstract
A robust in situ nickel oxynitride (Ni x O y N z ) system is synthesized by solid-state annealing of nickel nitride at a relatively low temperature of 400 °C, as confirmed by XRD and Rietveld refinement analysis. XPS investigations revealed that the oxynitride phase is evolved and stabilized by a network involving N 3–, Ni 3+/2+/0, and O 2– in the system. The enhanced properties of the developed oxynitrides emerged via the synergistic interactions between the nickel nitride–nickel oxide–metallic nickel components, owing to their quantum-cascading electronic band alignments in the system. Consequently, the developed Ni x O y N z system exhibited impressive photocatalytic efficiencies, including ∼98/88% degradation of MB/RhB dyes in 150 min and the production of H 2 and NH 3 at rates of 339.7 and 239.8 μmol g –1 h –1, respectively, under visible light, surpassing the performance of the bare oxide and nitride systems. The improved magnetic properties and photostabilities of the synthesized Ni x O y N z system allowed for easy recovery and reusability, as confirmed in its postcharacterization studies. The findings of the study revealed that the formation of a Ni x O y N z system with tunable phases can be feasible from a pre-engineered Ni 3 N system, and the resulting Ni x O y N z can be a robust photocatalyst for energy-efficient multifaceted photocatalytic applications, as demonstrated in this study.
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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 | 0.002 | 0.000 |
| Meta-epidemiology (narrow) | 0.002 | 0.002 |
| Meta-epidemiology (broad) | 0.002 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.001 | 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; 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".